Mean Intensity Of Infestation Research Articles

Distribution of phoretic mites and lice in Pseudolynchia canariensis living on pigeons and the relationship with seasonality, carrier sex, plumage coloration and age of definitive hosts

Among the parasites, some groups that have a limited capacity for locomotion, such as mites and lice, the transmission is challenging to win. These ectoparasites disperse through direct contact between hosts or, in some cases, through phoresy. However, these processes are not well-documented in detail because they are difficult to observe and quantify. In the present study, the patterns of distribution of skin mites and phoretic lice on hippoboscid louse fly Pseudolynchia canariensis sampled from Columba livia were evaluated. The analyzed pigeons were juveniles and adults, with three distinct plumage colors: blue checker, spread, or wild type, and were caught over 24 months. A total of 1,381 hippoboscid flies were collected on 377 hosts. The plumage color did not influence the infestation patterns of louse flies on juvenile and adult pigeons, nor did it influence the infestation patterns of skin mites and phoretic lice on the hippoboscid flies. However, the environmental temperature was directly related to higher prevalence, mean infestation intensity, and phoretic species richness on P. canariensis during the hottest seasons. Furthermore, a higher abundance of phoretic mite eggs, including embryonated eggs, was observed in females of P. canariensis in all seasons.

Features of Engorgement of Ixodes ricinus Ticks Infesting the Northern White-Breasted Hedgehog in an Urban Park.

In this work we exploited the parallel dense tick and hedgehog populations of an urban park in Budapest, Hungary as a good host-parasite model to obtain detailed data about this physiological relationship. Over a 27-week period from April to October, 57 hedgehogs were captured in an urban park and kept for 10-14 days in animal house. All dropped off ticks were sampled, which allowed us to draw more a detailed picture of Ixodes ricinus-hedgehog relationships. The results indicated that the hedgehog is an effective host for ticks (prevalence: 100%) and the mean intensity of infestation was 83.25. Of the male ticks, 68.42% dropped off dead; 1.56% of the dropped off nymphs and 11.4% of the larvae finished their bloodmeal with red cuticles, while 5.79% of the females could not finish their blood meal, and dropped off dried, dead, or shrunken. We applied novel statistical methods of survival analysis of prevalent cohorts to estimate the whole attachment times of ticks from the observed attachment times, having no information about when the ticks attached to their hosts. Mean attachment times were 4 days for larvae, 5 days for nymphs, 10 days for females, and 8 days for males. On the first day after capture of the hosts, fewer females, nymphs, and larvae detached engorged than had been predicted, but this was not true for males. Mean intensity of infestation per host was 1.4 for males, 6.7 for females, 45.0 for nymphs, and 29.3 for larvae. As regards seasonality, the activity of all stages of ticks consisted of several smaller peaks and considerably differed by season. Studies of the dense tick-host populations of this natural habitat could provide further valuable data about tick-host relations, the data of which cannot be drawn from most other hedgehog habitats.

Ácaros ectoparasitas em lagartos da espécie Hemidactylus mabouia (Squamata: Gekkonidae)

This work aimed to determine mite species in H. mabouia lizards in Arapiraca region, as well as to verify if the mites present in the lizards are shared with native species, such as members of the genus Tropidurus. The collection of H. mabouia took place from February to May 2019, using traps and nets. The lizards were captured alive in the Pé Leve Velho village, Arapiraca – AL, then sent to the Laboratory of Entomology and Acarology at UFAL Campus de Arapiraca so that a detailed examination of the epidermis region could be carried out using a stereomicroscope to detect ectoparasites. Ten specimens of H. mabouia were captured. A total of 348 ectoparasitic mites were found in them. The occurrence of mites of the Pterygosomatidae families, genus Geckobia was also verified in all captured lizards. The mean intensity of infestation was 34.8 mites per lizard. There was no record of ectoparasite mites in Tropidurus lizards.

New Host Record for Nerocila fluviatilis (Crustacea, Isopoda) and First Data on Its Abundance and Size, with Updated Geographic Distribution and Hosts

Nerocila fluviatilis Schiœdte and Meinert 1881 (Isopoda, Cymothoidea, Cymothoidae) is reported for the first time for a new host order of host, Mugil liza Valenciennes, 1836 (Actinopterygii, Mugiliformes, Mugilidae). Fish were collected in a coastal Atlantic lagoon in eastern Uruguay, Laguna de Rocha, and parasites were consistently restricted to the surface of caudal, anal, and paired fins. All stages of N. fluviatilis were found. Data on prevalence (6%), mean intensity of infestation (5.2), and size are provided for the first time for all stages of N. fluviatilis. An updated account of the geographic distribution and hosts of the isopod is given.

Ecofriendly Management of Rugose Spiralling Whitefly Aleurodicus rugioperculatus Martin Infesting Coconut

Studies were conducted on the incidence, intensity of infestation, infestation grade index and natural enemy complex of rugose spiralling whitefly (RSW) Aleurodicus rugioperculatus Martin infesting coconut palms so as to evolve ecofriendly IPM. RSW incidence was at peak in June 2018 (38.3%), subsequently declined in December 2018 (20.5%), but later attained peak again in March 2019 (47.5%). The pest intensity also showed increasing trend from January 2018 to June 2019. The mean intensity of infestation and infestation grade index were 29.5% and 1.5 (medium), respectively in 2018-2019. The incidence and intensity significantly reduced from 75.5 to 37.7% and 85.7 to 42.9%, respectively on palms treated with ecofriendly IPM practices in 2018-19. Nut yield and net return were also found more in synergy with maximum parasitism (78.5%) by the aphelinid parasitoid Encarsia guadeloupae Viggiani observed on palms treated with ecofriendly IPM practices.

First Study of Pharingomyia picta and Cephanemyia auribarbis in Wild Populations of Red Deer (Cervus elaphus) in Portugal.

Simple SummaryThis study aimed to provide the first epidemiological data on nasopharyngeal myiasis in wild red deer from Portuguese territory. This parasitosis consists of the infestation of the host nasopharynx by Diptera larvae. In this study, the first scientific report in Portugal, a high level of prevalence (50.6%) and mean intensity of parasitism (11.38 larvae) were found. The following two larvae species were identified: Pharyngomyia picta and Cephenemyia auribarbis. The life cycle of this species can be summarised in the following series of stages: one adult stage, three larval stages, and one pupa stage. The larvae are the parasitic form, living and growing inside the host. With their spicules and hooks, they progress into the host’s nasal cavities causing sinusitis, sneezing, purulent mucous exudates, dyspnea, and swallowing. In addition, they can also cause neurologic symptomatology derived from erratic larvae migrations. Therefore, it would be important to develop further studies to estimate the sublethal effect of this parasitosis, for example, investigate whether it interferes with the roar and the reproductive performance, or if it leads to losses in carcass quality. For now, many doubts remain.Nasopharyngeal myiasis in red deer has never been studied in Portugal. For this reason, from December 2015 to February 2016 a study was derived on hunted red deer in Idanha-a-Nova county to evaluate the Diptera larvae presence. During the initial examination on the spot, the larvae was analysed at the nasopharynx. When present, larvae were collected for further species identification. The infestation prevalence was 50.6 ± 7.61% (CI 95%), and the mean parasitism intensity was 11.38 larvae per affected host. Two larvae species were found, Pharyngomyia picta and Cephenemyia auribarbis, both on single or concomitant infection, with the first species having a higher prevalence and mean infestation intensity than the second. The larvae’s prevalence was significantly higher (X2 = 4.35; p = 0.0370) in males (62.16 ± 11.05%) than in females (41.30 ± 10.06%). Within age groups, younger animals showed a higher prevalence. This study shows the presence of P. picta and C. auribarbis larvae in the wild red deer population in Portugal for the first time. The high parasitic prevalence and mean intensity highlight the importance of this parasitosis in this wild species. For this reason, more scientific research is required to accurately assess its prevalence in other geographic areas, and evaluate the risk factors as well effects of this parasitosis on the deer population.

Occurrence of infestation with the isopod, Alitropus typus M. Edwards (Crustacea: Flabellifera: Aegidae) on commercially important freshwater fishes of Kerala, India.

Rapidly rising temperatures and increasing organic load in the inland and coastal waters has led to a significant increase in parasite population. The isopod Alitropus typus infestation on fish in these waters have become more frequent, causing mortalities in both wild and cultured fishes. The present study was aimed to investigate the infestation on different fish hosts, mean intensity, prevalence, environmental influences on the parasite abundance and the histopathological changes it causes in the host. A total of 219 isopod specimens were collected from 149 infested fishes in two districts of Kerala, India. Among the different fish hosts, Channa striata was found to be the most susceptible, followed by Catla catla, Cyprinus carpio, and Wallago attu, with 81%, 10%, 7%, and 2% occurrence, respectively. The prevalence and mean intensity of infestation were found to be 69.8%, 44.4%, 68.2%, 62.5% and 1.33, 4.25, 1.26, 1.80 in C. striata, W. attu, C. catla, and C. carpio, respectively. The parasite abundance was directly influenced by temperature. The histopathology of affected gill tissues showed epithelial lifting, rupture of secondary gill filaments, vacuole formation and hemocytic infiltration. The findings indicated that the isopod parasite, A. typus had a negative impact on fish health and appearance, causing economic losses to the small scale farmers/fishermen. This is the first reported record of the infestation of isopod parasite, A. typus on the Indian major carp C. catla and C. carpio from India.

Population characteristics of louse Columbicola columbae Linn. 1758 (Phthiraptera: Insecta) on pigeons in Uttar Pradesh, India

Population characteristics of the pigeon louse, Columbicola columbae were recorded on 360 pigeons in the district Meerut, Uttar Pradesh during 2017. Parasitic infestation was 70 per cent with mean intensity of 58.5, with a range of 1-200. The louse exhibited skewed distribution on host body (variance/ mean = 44.5; index of discrepancy = 0.54; exponent of negative binomial = 0.34), however the frequency distribution pattern could not conform to negative binomial model. Sex ratio and adult nymph ratio of the louse were also skewed (M: F = 1: 1.3; A: N = 1: 1.2). Mean monthly prevalence and mean intensity of infestation exhibited significant positive correlation with the environmental temperature and photoperiod but not with relative humidity.

Hyalomma aegyptium the dominant hard tick in tortoises Tesdudo hermanni boettgeri found in different regions of Albania

The purpose of this study was to estimate the level of hard tick infestation in the tortoise subspecies Testudo hermanni boettgeri living within the free-range hills and mountains of four regions of central and south Albania. In addition, this study showed the morphological differences of infested and non-infested tortoises in several geographic locations where tortoises are known to be infested with Hyalomma aegyptium, a natural carrier of different zoonotic pathogens. Thirty-six of 145 (24.8%) examined Hermann's tortoises were found to be infested with hard ticks. After the tortoises were carefully captured and controlled, a total of 67 H. aegyptium were collected: 47 in Berati, 11 in Ballshi and 9 in Saranda. None of the 40 tortoises in the Tirana region were found to be infested with ticks. All ticks were identified as H. aegyptium adults. The highest prevalence of tick infestation was in the Berati region at 49.1%, followed by the Ballshi and Saranda region by 24% and 12%, respectively. The mean infestation intensity was 1.86 H. aegyptium per Hermann's tortoise, and it was found that H. aegyptium are less common in large Hermann's tortoises. The number of H. aegyptium male ticks was negatively correlated with the body dimensions of Hermann's tortoises. Hyalomma aegyptium is the most prevalent tick in Hermann's tortoises in three regions of south Albania, and with a typical three-host life cycle in different wild and domestic animals, they may be a vector of zoonotic pathogens. Furthermore, other studies should be conducted to detect the presence of zoonotic pathogens in ticks from these regions and to estimate the risk of transmission in animals and humans.

Prophylactic Effects of Ivermectin and Closantel Treatment in the Control of Oestrus ovis Infestation in Sheep.

The sheep nasal bots Oestrus ovis is parasite of the nasal cavities and sinuses of small ruminants causing oestrosis, one of the most frequent parasitic diseases in sheep and goats. The widely use of ivermectin and closantel by the sheep breeders in the treatment and prophylaxis of gastrointestinal nematodes resulted in widespread cases of anthelmintic resistance. However, there is no report about cases of O. ovis with drug-resistance. In this study, we evaluated the prophylactics and therapeutic effects of both antiparasitics in sheep with O. ovis natural infestation. The trial was carried out from early December 2019 to March 2020, with 30 crossbred males lambs allocated into three groups of 10 animals each: control (without treatment), treated with ivermectin (0.2 mg/kg subcutaneously) and treated with closantel (10 mg/kg orally). The animals were kept together grazing the same pasture area. The treatment groups were drenched in two occasions 70 days apart: on 5th December 2019 and on 13th February 2020. On 19th March 2020, all lambs were slaughtered. The lamb heads were removed and sectioned along their longitudinal and sagittal axis to search for larvae. Recovered O. ovis larvae were counted and identified according to their developmental stage (L1, L2, and L3). Seven of the control lambs were infested with O. ovis larvae ranging from six to 17 larvae (11.6 mean infestation intensity). All recovered larvae from control group were intact and active. Three animals treated with ivermectin had O. ovis larvae (1–3 larvae), however they were dead and in degeneration. The animals treated with closantel did not have any larvae. The clinical suggestive signs of oestrosis were scarce over the experimental period. The averages of daily weight gain were similar (p > 0.05) among groups. Closantel and ivermectin had high efficacy against oestrosis and O. ovis parasitism did not hinder the performance of lambs.

Community of macroparasites of the Pacific barracuda Sphyraena ensis Jordan and Gilbert, 1882 (Perciformes, Sphyraenidae) from the north coast of Peru

This study aimed to report the community of macroparasites of the Pacific barracuda Sphyraena ensis Jordan and Gilbert, 1882 (Perciformes, Sphyraenidae) from the north coast of Peru. From September to October 2019, 138 specimens of S. ensis were acquired from Caleta de Zorritos, Contralmirante Villar Province, Tumbes, on the north coast of Peru. The community of parasites found consisted of nine species of parasites including monogeneans, copepods, trematodes and nematodes. The total body length of the fish was negatively correlated with the mean intensity of infestation of Pseudochauhanea sp. The mean abundance of Pseudochauhanea sp. also showed a marked significant difference between the populations of male and female fish, being more associated with males. We provide a list of macroparasites recorded in fish of the genus Sphyraena in the Eastern Pacific Ocean. Checklist dataset published through GBIF (Doi: 10.15470/5htffh)

Gussevia spiralocirra (Monogenea: Dactylogyridae) in farmed Pterophyllum scalare

The monogenean parasites are one of the most important pathogens causing economic losses in fish farming worldwide. This study aimed to evaluate parasitological indexes of Gussevia spiralocirra in juvenile Pterophyllum scalare , in the warm and cool season. A total of 34 fish were examined for parasitological analysis and the water quality was measured during the experimental period. The gills were fixed in 5% formalin solution for quantification and the parasites were mounted in Hoyer´s medium for identification. The parasitic species was identified as Gussevia spiralocirra , and presented a prevalence of 100%. The mean abundance and mean intensity of infestation were significantly higher in fish during the warm season (784.0 ± 393.9) than that observed in the cool season (418.0 ± 111.2). Temperature did influence the biology of G. spiralocirra possibly by increasing the oviposition rate. This study presents important data that can be used for implementation of best management practices in ornamental P. scalare farming, especially in the hottest seasons of the year.

Survival Strategies and Seasonal Size Variations of Feather Mites Proctophyllodes megaphyllus on their Host Alpine Accentor Prunella collaris

Compared to chewing lice, symbiotic and studies on their biology, ecology and survival strategies are still rare. To describe the ecology and morphology of the mite species Proctophyllodes megaphyllus, a symbiont of the alpine accentor Prunella collaris, 150 accentors were captured in the West Carpathian Mountains of Slovakia. The mites extracted from the birds were sexed and their specific body structures were measured. In total 2144 individuals of P. megaphyllus were collected from 100 accentors. Male mites collected in autumn, after the bird's postnuptial moult, reached the largest size. At the same time, mite prevalence reached maximum while the mean intensity of infestation was at its lowest. Our results suggest that mites preferred newly coated feathers after a moult and radiated horizontally, infesting birds at shared roosting sites where alpine accentors tend to reoccur. This study is one of the few evaluations of seasonal variation in ecology and morphology of feather mites in alpine conditions.

From unwanted squatters to good tenants: Ectosymbionts and their relationships with body condition of Atlantic Forest Passeriformes

AbstractMany organisms live in or on birds, with arthropods being the best studied ones. Ectosymbiotic arthropods may parasitise birds by feeding upon blood or feathers, thereby causing injury or competing for essential resources. Nevertheless, ectosymbionts sometimes cause no adverse effect to birds because they consume only excess preening oil, debris and microorganisms on feathers. The influence of these ectosymbionts on host body condition is still poorly understood, especially for species living in one of the most endangered biomes, the Atlantic Forest in South America. We tested for the relationships between ectosymbionts and host’s morphological traits: flight muscle condition, mass index and feather growth rate. We inspected the body surface of 282 individual birds of 45 understory‐dwelling species looking for ectosymbionts and estimated vane‐dwelling feather mite load in their remiges. We calculated ectosymbiont prevalence and mean infestation intensity in 193 individual birds from 11 species. In seven species (n = 106 individual birds), we tested for the relationship between ectosymbionts and morphological traits using generalised linear mixed models. We found a negative relationship between the presence of ectoparasites and the host pectoral muscle condition, supporting the parasitic nature of tissue‐feeding symbionts. Nevertheless, we found no relationship between vane‐dwelling feather mite loads and hosts’ morphological traits, which supports the hypothesis of likely commensalism between these organisms.

Effect of seasonality and microclimate on the variation in bat-fly load (Diptera: Streblidae) in a cave bat assemblage in a dry forest

Abstract Seasonality causes fluctuations in the availability of resources, affecting the presence and abundance of animal species. These fluctuations can have an impact on parasite-host relationships, which in turn can be exacerbated by microclimatic changes to which bat-flies are exposed. We characterized the bat-fly load and evaluated the effect of seasonality on five bat species in a dry forest. We evaluated variations in microclimatic conditions inside the cave Cerro Huatulco between seasons and the response of the bat-fly load. We collected 1165 bat-fly specimens belonging to 16 species from 688 bats. The obtained results indicate that the mean abundance and infestation intensity exhibited changes between seasons in Artibeus jamaicensis, Desmodus rotundus, Glossophaga soricina, and Pteronotus parnellii. In the case of the effect of microclimate conditions, we observed that prevalence is negatively correlated with temperature in G. soricina, while mean abundance and mean infestation intensity were negatively related to temperature in A. jamaicensis and G. soricina. The present study provides significant information about host-parasite relationships in a dry forest and discusses the relevance of abiotic and biotic factors that could affect host-parasite interactions, as well as the importance of each parasite load parameter for the understanding of this interaction.

Host-ectoparasite associations; the role of host traits, season and habitat on parasitism interactions of the rodents of northeastern Iran

• New insights were given on host-ectoparasite associations in northeastern Iran. • Nosopsyllus fasciatus and Polyplax asiatica were dominant flea and louse on rodents. • Nosopsyllus fasciatus exhibits low and Polyplax asiatica moderate host specificity. • Haemaphysalis punctata and Haemolaelaps sp. were the most abundant tick and mite. • Seasonal fluctuations were found in the occurrence of ectoparasite on rodents. Rodents play a significant role as reservoirs of zoonotic diseases. Nevertheless, in general their ectoparasite assemblage and host-ectoparasite associations are poorly known. This study intended to provide new insights into the relationships between ectoparasites and rodents in northeastern Iran. Rodents were captured using live traps during the years 2016–2020, and their ectoparasites were collected. Parasitological indices such as infestation rate, prevalence and mean intensity of infestation were analyzed. A total of 284 rodents, belonging to 17 species, were trapped and found to be infested by 178 ectoparasites from five orders Siphonaptera, Phthiraptera, Ixodida, Mesostigmata and Trombidiformes. The overall infestation rate was 50.3%. The flea Nosopsyllus fasciatus and the louse Polyplax asiatica dominated among all fleas and lice, respectively. Haemaphysalis punctata and Haemolaelaps sp. were recorded as the most abundant tick and mite, respectively. Nosopsyllus fasciatus exhibited low and Polyplax asiatica moderate host specificity . Approximately 64.2% of ectoparasites shared more than one host, and others were singletons. Seasonal fluctuations were found in the occurrence of ectoparasite; fleas and lice were more abundant in spring and winter, respectively. Ticks demonstrated high abundance in spring and summer and mites were more common in autumn. The overall prevalence of ectoparasite on male rodents was greater than that on females (56.4% vs. 44.4%), while similar mean intensities were detected for both sexes. This study extends the knowledge on the distribution, seasonality and host choice of four main groups of ectoparasites in association with rodents. Further studies are needed to provide deep insight into how relationships and interactions between ectoparasite and rodents are formed, and how they can be applied in epidemiology.

Alcedoffula alcyonae Carriker (Phthiraptera: Ischnocera: Philopteridae) infesting belted kingfisher, Megaceryle alcyon (Linnaeus) (Aves: Coraciiformes, Alcedinidae), in Manitoba, Canada

AbstractForty-one belted kingfishers, Megaceryle alcyon (Linnaeus) (Aves: Coraciiformes: Alcedinidae), from Manitoba, Canada were examined for ectoparasites in 1995–2020. One species of chewing louse, Alcedoffula alcyonae Carriker (Phthiraptera: Ischnocera: Philopteridae), infested 48.8% of hosts. The mean intensity of infestation was 17.1, and mean abundance was 8.5 lice per bird. Distribution of infestation was highly aggregated. Although female lice outnumbered males, the sex ratio was not significantly different from 1.0. The ratio of nymphs to females was 2.6. An unidentified species of feather mite of the genus Proterothrix Gaud (Acari: Astigmatina: Proctophyllodidae) infested three of 35 hosts (8.6%). No mites were found in the quills of primary feathers from 19 birds, and no nasal mites were collected from 32.

Absence of Hemolivia mauritanica (Apicomplexa: Haemogregarinidae) in natural populations of Testudo graeca in Morocco.

During spring 2018, we captured 101 spur-thighed tortoises, Testudo graeca, from seven localities in central Morocco. All tortoises were examined for the presence of blood parasites Hemolivia mauritanica and Hyalomma aegyptium ticks, the known vectors. We looked for H. mauritanica infection by examination of blood smears and by genetic analysis with PCR using extractions from both tortoises and ticks. On all tortoises collected, 71.29% were infested with at least one tick, with a mean infestation intensity of 7.12 ticks/tortoise and maximum of 15.55 ticks/tortoises in Had Draa locality (Essaouira region). Although the definitive host is present and abundant in all tortoise populations, all blood samples were Hemolivia-negative. Our results support and confirm the finding of studies previously conducted in other populations of Morocco and indicate that H. mauritanica has a narrower distribution range than its tick vector.

High prevalence and intensity of infestation of Eutrombicula alfreddugesi (Acarina: Trombiculidae) on Tropidurus torquatus (Squamata, Tropiduridae): effects of body size and on body condition across ten populations along the Brazilian coast

We investigated the infestation of Eutrombicula alfreddugesi mites on Tropidurus torquatus lizards across ten coastal populations in Brazil to evaluate variations among localities and relationships with intrinsic features of hosts (body size and body condition). For each population, we calculated the prevalence of infestation and the mean number of mites per host (mean intensity of infestation). Lizards from all populations were infested by mites, with prevalence ranging from 95.6 to 100%. Mean intensities of infestation also were always high, ranging from 55.3 ± 88.8 to 280.9 ± 208.2 mites per lizard. The lizard body regions most intensely used as microhabitat by mites were the axillae and neck (which bear “mite pockets” in T. torquatus). In most populations, the number of mites tended to increase with the body size of hosts. The body condition of hosts and the intensity of infestation were positively correlated, considering the total sample (i.e. lizards of all populations pooled). The main microhabitats (i.e., body regions) used by E. alfreddugesi on T. torquatus represented total intensities of infestation, suggesting that counting mites on these body regions provide a useful index to estimate the overall intensity of infestation. Lizards are suitable and predictable resources for parasitic mites, which take advantage of ecological and morphological features of host individuals and species, with large body sizes, imbricated and keeled scales, and presence of skin folds and mite pockets favoring occupation and high intensities of infestation by mites.

Associations between different Laelapidae (Mesostigmata: Dermanyssoidea) mites and small rodents from Lithuania

Associations between species of Laelapidae (Mesostigmata: Dermanyssoidea) mites and small rodents have been studied insufficiently. The aim of this study was to investigate infestation patterns of small rodent species by laelapid mites at six locations in Lithuania. A total of 728 rodents were snap- and live-trapped in various locations during 2013-2016. Eight rodent species were identified, namely Apodemus flavicollis, Apodemus agrarius, Myodes glareolus, Micromys minutus, Mus musculus, Microtus oeconomus, Microtus arvalis and Microtus agrestis. A total of 343 (47.1%) rodents were found to be infested with up to eight species of parasitic mites from the Laelapidae family (n = 1363): Laelaps agilis, Laelaps hilaris, Hyperlaelaps microti, Haemogamasus nidi, Haemogamasus hirsutus, Eulaelaps stabularis, Hirstionyssus sunci and Myonyssus gigas. The dominant species of mite found on rodents was L. agilis (89.1%), found on 43.4% of all hosts. Abundance and mean intensity of infestation with mites varied among species of hosts and were highest for A. flavicollis. We document new geographical and host records for gamasid mites of eight rodent species in Lithuania.