Ramus Of Uropod Research Articles

Ingolfiellids (Crustacea, Peracarida, Ingolfiellidea) from the Intra-Americas Sea with the description of a new deep-sea species of Ingolfiella from the southern Gulf of Mexico

The order Ingolfiellida (Crustacea, Peracarida) represents a small group of peracarid crustaceans, usually less than 3 mm long and comprising 53 species in several ecosystems worldwide. Previously, eight ingolfiellid species had been documented from the Intra-Americans Sea: one from the Gulf of Mexico and eastern Florida and seven from the Caribbean Sea, including the Bahamas. A new deep-sea species of Ingolfiella is described based on material collected from bathyal soft bottoms (2650 m depth) offshore Veracruz State, southern Gulf of Mexico. The new species can be differentiated as follows: accessory flagellum 2-articulate; antenna 2 flagellum 4-articulate; pereopods 5-6 with long curved seta on dactylus; rami of uropod 1 subequal in length; uropod 3 ramus longer than peduncle, unarticulated; pleopods 1-3 as long as pleonal segments; maxilla 1 inner plate with one tiny seta distally; mandible without palp; molar poorly developed; pleopods reduced; telson as a fleshy ovoidal lobe with two slender dorsal setae. A table and a map featuring the nine ingolfiellids recorded in the Gulf of Mexico, the Caribbean Sea, and eastern Florida are also provided. The new species increases the number of Ingolfiella species to 35 worldwide, representing the second record of ingolfiellids from the Gulf of Mexico.

A new species of Eusirus Krøyer, 1845 (Amphipoda, Amphilochidea, Eusiridae) from the seamount of the Caroline Plate, with redescription of Meteusiroides keyensis Pirlot, 1934

A new Eusirus Krøyer, 1845 species within the family Eusiridae Stebbing, 1888 is described based on specimens collected from seamounts of the Caroline Plate. Eusirus carolinussp. nov. is characterized by having large, well-pigmented eyes, the distomiddorsal mediodorsal pointed process only present on pleonites 1 and 2, epimeral plate 3 with a smooth posterior margin, the elongated telson only cleft 20%, and the rami of uropod 3 being equal in length. A rare eusirid species, Meteusiroides keyensis Pirlot, 1934, is redescribed as providing the living coloration based on one female specimen. Sequences of two genes (16S rRNA and COI) were used to analyze their relationships with other species in the family Eusiridae and confirm the taxonomic placement. The result supports the monophyly of Cleonardo Stebbing, 1888; Eusirus and Rhachotropis S.I. Smith, 1883; and is consistent with morphological classification.

One new species of Stegocephalus Krøyer, 1842 (Amphipoda, Stegocephalidae) described from a seamount of the Caroline Plate, NW Pacific.

A new species of the subfamily Stegocephalinae, Stegocephaluscarolussp. nov., is described from a seamount in the Caroline Plate. Two related species, S.cascadiensis (Moore, 1992) and S.longicornis (Gurjanova, 1962), were previously reported in the North Pacific. Important morphological characters which differentiate S.carolussp. nov. from S.cascadiensis are found in antenna 1, the mouthparts, pereopod 7 and the length of rami of uropods 2 and 3. The new species differs from S.longicornis by characters of antenna 1, the mouthparts and the shape of epimeral plate 3. Additionally, the morphological differences between the new species and the remaining seven species of Stegocephalus are also presented.

Description of one species of freshwater amphipod Hyalella (Crustacea, Peracarida, Hyalellidae) from the northwest region of the state of Rio Grande do Sul, Southern Brazil.

In this study, a new species of Hyalella is described from southern region of Brazil. Hyalella jaboticabensis n. sp. was recorded in the municipality of Jaboticaba, northwest region of state of the Rio Grande do Sul, southern Brazil. This species is characterized by showing smooth body surface, epimeral plates not acuminated, inner face of the gnathopod 1 with nine or ten serrate setae and some simple setae (six to eight), inner ramus of uropod 1 of males with one short curved seta, peduncle of the uropod 3 with six cuspidate setae with an accessory seta and two or three cuspidate setae on the rami, telson as long as wide (square) with six to eight short and long cuspidate setae with an accessory seta. This new description increases the Brazilian known diversity of species of Hyalella to 42 (25 to southern Brazilian region) and 108 species in the Americas. It is noting that it is crucial to know the complete diversity of Hyalella genus, and to consider conservation measures to protect species like H. jaboticabensis n. sp., endemic to two single small streams.

Redescription and molecular characterization of Mothocya parvostis Bruce, 1986 (Crustacea: Isopoda: Cymothoidae) parasitic on Japanese halfbeak, Hyporhamphus sajori (Temminck & Schlegel, 1846) (Hemiramphidae) with Mothocya sajori Bruce, 1986 placed into synonymy.

Two species of Mothocya have previously been recorded from Hyporhamphus sajori: M. parvostis Bruce, 1986 and M. sajori Bruce, 1986. Mothocya parvostis is re-described based on the ovigerous female type and additional materials collected from the host from in and around the type locality. Morphological re-examination of fresh specimens and the type materials together with genetic data show that the M. sajori and M. parvostis are the same species, differing primarily in size, therefore we have placed Mothocya sajori Bruce, 1986 into a junior synonym of Mothocya parvostis Bruce, 1986. Mothocya parvostis is characterized by the following combinations of characters: 1) body slightly to moderately twisted to one side; 2) pereonite 7 posterior margin moderately to deeply recessed; 3) uropodal rami extending to pleotelson posterior margin; and 4) uropod rami bluntly rounded, exopod 1.5 times as long as peduncle. The differences of four morphological features for M. parvostis and M. sajori was quantified. Furthermore, a total of 635 isopods infesting H. sajori were collected from all over Japan to conduct quantitative morphological and molecular sequence analyses (mitochondrial cytochrome c oxidase subunit I and 16S rRNA). Although the four quantitative features did not overlap between the two species in type specimens, all quantitative morphological values of newly collected specimens in this study did not display a bimodal distribution. In addition, our molecular analyses found only a single clade for our newly collected specimens in neighbor-joining tree.

A new species of Paraphoxus (Amphipoda, Phoxocephalidae) from Jeju Island, Korea

Abstract During a scientific survey, a new species of phoxocepalid amphipod, Paraphoxus jejuensis sp. nov., was found in the tidal flat of Jeju Island, Korea. Paraphoxus jejuensis sp. nov. is distinguished from its congeneric species by the following features: the presence of a conical-form of incisor on the right mandible, an expanded and subovate basis of pereopod 5, the presence of a single plumose facial seta on epimeron 2, the presence of a few baso-facial setae on the peduncle of uropod 1, the absence of marginal spines and setae on the rami of uropod 2, and the presence of two subapical spines on each lobe of the telson. This new species is described and illustrated herein.

​Identification of Gnathiid Isopods as Ectoparasites of the Brown-spotted Grouper Epinephelus chlorostigma from the Red Sea of Saudi Arabia

Background: Gnathiids are considered excellent ectoparasites widely distributed along the fish body with a biphasic life cycle including parasitic larval stages and free-living adults. This study focused on gnathiids infecting the brown-spotted grouper fish and confirming the identity of the host species. Methods: Twenty Epinephelus chlorostigma (Serranidae) were collected from the Red Sea Coast (especially off Jeddah, Saudi Arabia) and examined for gnathiid fish parasites. Species identification of the larvae was based on morphological criteria of Smit and Basson (2002). In contrast, the taxonomy of fish species was supported by amplification and sequencing of host DNA via the mitochondrial DNA genes (COI and 16S rRNA) using gnathiids’ blood meals. Result: Praniza larvae of a gnathiid isopod were collected from the gill chambers of the examined fish. The prevalence rate was 60% and mean intensity of the pranzia larvae was 16. The pranzia larva is described microscopically and distinguished by large body size (3.51-5.90 mm), the presence of 8th teeth in the mandible, maxilliped with 5-7th teeth on the first palp and the endite hooked, pleotelson with concave anterolateral margins and rami of uropods extend its apex. The recovered larvae could be identified as pranzia larvae of Gnathia pantherina Smit and Basson, 2002 due to the morphological resemblance. The host species identity was confirmed molecularly with COI and 16S rRNA genes and showed highly stringent criteria with the previously E. chlorostigma sequence data. The obtained host DNA sequences were deposited in NCBI database under accession numbers ON384530.1 for COI and ON384544.1 for 16S rRNA.

Hyalella luciae (Crustacea, Amphipoda, Hyalellidae)a new species of freshwater amphipod from Southern Brazil.

Currently, the freshwater amphipod Hyalella Smith, 1874 includes 91 valid species distributed only in the Americas. This study describes the fifth species for the Vrzea River basin, located in the northwestern region of the state of Rio Grande do Sul, Southern Brazil. Among its most prominent features are the presence of the curve seta on the inner ramus of uropod 1 of the males, sternal gills on segments 2-7, propodus ventral face of the gnathopod 1 with nine serrate setae and several small simple and triangular setae, peduncle of uropod 3 with 11-12 distal cuspidate setae with accessory setae, and telson with fifteen cuspidate setae with accessory setae distributed on distal margin. This study presents a detailed comparison of the species we are describing with those already discovered. The diversity of freshwater amphipods in southern Brazil is intriguing. Further investigations should open the way to elucidate the evolutionary history of these crustaceans, uncovering the potential and patterns of diversification of the genus Hyalella.

Taxonomic study of the genus Gammarus (Amphipoda, Gammaridae) from Xinjiang, China, with description of a new species.

A new species, Gammarus hoboksar Hou, sp. nov., is described from the Irtysh River basin of Xinjiang, China. The species differs morphologically from its congeners by calceoli of antenna II absent; merus and carpus of pereopods IIIIV with short setae; inner ramus of uropod III about 0.79 times the length of outer ramus, terminal article of outer ramus about 0.24 times the length of first article; telson cleft, with spines and setae on surface and three spines on distal end. Phylogenetic analysis based on 28S rRNA and COI gene sequences supported the species distinctness. A key to the genus Gammarus with nine species and a map of their distributions are provided.

A new species of Expanathura (Crustacea: Isopoda: Anthuroidea) from Iriomote Island, Japan, with a note on male polymorphism.

We describe Expanathura monile sp. nov. from Iriomote Island, Okinawa, Japan, northwestern Pacific. This species resembles E. collaris, E. macronesia, and E. haddae in having very broad uropodal rami, a broad telson, and a moderately shortened pleopod 1 endopod, but differs from these three species in the female having (1) the head with a dorsal V-shaped band of brown pigmentation, (2) the antennular flagellum with 34 articles, (3) antennal peduncular article 2 with an outer triangular projection, (4) the uropodal endopod longer than wide, (5) the uropodal exopod with an acute triangular projection, (6) an oval telson, and (7) the posterolateral setae on the telson similar in length. We present a revised key to known species in the genus Expanathura and briefly discuss the male polymorphism observed in E. monile.

A new species of freshwater amphipod (Crustacea, Peracarida, Hyalellidae) from Southern Brazil

The freshwater amphipod of the genus Hyalella is typical from continental American waters and shows high levels of endemicity and Brazil has the second largest diversity. A new species is described here, Hyalella longipropodus n. sp. that occurs in a spring of southern Brazil in the municipality of Palmeira das Misses, in the northwestern region of state of Rio Grande do Sul, southern Brasil. Hyalella longipropodus n. sp. shows the following character states: antenna 2 more than half body length, gnathopod 2 propodus elongated, uropod 1 inner ramus of male without apical curved setae, uropod 3 peduncle with seven strong distal setae with accessory setae, ramus of uropod 3 with ten cuspidate setae with accessory setae. Hyalella longipropodus n. sp. occurs in sympatry with H. gauchensis, but these differ especially in the size and shape of gnathopod 2, the presence of curved setae on uropod 1 in H. gauchensis and the absence in H. longipropodus n. sp., antenna length (longer in H. longipropodus n. sp.) and number of cuspidate setae on uropods 1, 2, and 3. Besides the morphological differences, H. longipropodus n. sp. presented genetic differences always above 19% for the COI gene and 29 % for the 16S rRNA gene, when compared with other species found in the northwestern region of the state of Rio Grande do Sul, showing that it is really a species not yet described by science.

The Caucasian relicts: a new species of the genus Niphargus (Crustacea: Amphipoda: Niphargidae) from the Gelendzhik–Tuapse area of the Russian southwestern Caucasus

A new species of the genus Niphargus is described from the Gelendzhik–Tuapse area of the Russian southwestern Caucasus. It belongs to the “puteanus” species group and phylogenetically related to Caucasian N. ciscaucasicus and N. talikadzei, separating from other Caucasian species of the genus by the presence of 2 hooks in retinacules on pleopods, different rami of uropod I both in males and females, and relatively large inner ramus of uropod III. Molecular study has revealed that Niphargus bzhidik sp. nov. and related N. ciscaucasicus are relicts of the Late Miocene speciation, associated with the Messinian crisis (5.96–5.33Mya) separated widespread Paratethys species, which survived in long-term genetic isolation for a long time. The new species is blind and epigean, and probably unable to spread over long distances, but this way of life probably allowed surviving in refugee during the Quaternary period with a colder climate. Analysis of stable isotopes (δ13C/δ15N) revealed that the new species is carnivorous, in contrast to another studied stygobiotic herbivorous Niphargus species (e.g., Niphargus cf. tauricus). The key to the Caucasian and Eastern Asian species of the genus Niphargus, known from the territory of the former USSR, is presented in the article. [http://zoobank.org/urn:lsid:zoobank.org:act:E0019189-2432-4B64-B153-94C43FDD93E3]

A new species of Gammarus Fabricius, 1775 (Crustacea: Amphipoda: Gammaridae) from extreme high-altitude Lake Tong Tso, Qinghai-Tibetan Plateau

A new species of the genus Gammarus Fabricius, 1775 is described from Lake Tong Tso, an extreme high-altitude lake in the Qinghai-Tibetan Plateau. Gammarus pontual sp. nov. is considered part of the Gammarus lacustris G.O. Sars, 1863 group, which is characterized by having the inner ramus of uropod 3 longer than half the length of the outer ramus, and by having both rami covered with plumose setae. The new species stands apart from their congeners, mainly, by the following combination of characters: head with cephalic lateral lobe truncated; gnathopods 1-2 propodus weakly armed, with 1 stout seta defining palm; palm longer than posterior margin of propodus, with 1 main stout seta medially; pereopods 5-7 basis slender, posterior margin crenulate; epimeral plate 1 posterior margin produced into a short spine, facial ridge present; epimeral plates 2-3 posteroventral corner sharply pointed; uropod 3 rami covered with plumose setae, inner ramus about 80% the length of the outer ramus; telson apex with 2 stout setae on each side.

A newGammarusspecies(Crustacea,Amphipoda,Gammaridae) fromNorthwesternIslands,SouthKorea.

A new species, Gammarus baengnyeongensis sp. nov., belonging to the family Gammaridae Leach, 1814 was collected from the Baengnyeongdo and Daecheongdo islands in South Korea. This new species is characterized by the flagellum of antenna 2 with calceoli, and the length ratio of outer ramus to inner ramus of uropod 3. Descriptions of diagnostic characteristics of the species are provided in the text. We performed statistical analysis to confirm the significance of morphological differences of interspecies. Additionally, we compare the new species to related species by the partial sequence of the mitochondrial cytochrome c oxidase subunit 1 (CO1) gene. Genetic distances between the new species and closely related species rated from 29.1-40.8%, which highly supports Gammarus baengnyeongensis sp. nov. as a valid species. In this study, we add one new Gammarus species in Korean waters.

Cirolana westbyi, (Isopoda: Cirolanidae) a new species in the ‘Cirolana parva-group’ from the Turneffe Atoll, Belize

ABSTRACT Cirolana westbyi n. sp., a novel species in the ‘Cirolana parva-group’ is described from the Turneffe Atoll, Belize using an integrated molecular and morphological approach. The 18S ribosomal RNA gene for C. westbyi n. sp. and also for Cirolana parva Hansen, 1890 are provided, in addition to new primers, developed for the Cirolanidae 18S gene. The key morphological character for separating C. westbyi n. sp. from other Cirolana is the shape of the uropodal rami: the uropodal endopod is convex on the lateral side while the mesial side is straight. Comparison of the 18S gene shows that C. parva is 95.96% identical to C. westbyi n. sp. across 68% coverage, but due to two unique insertions (‘INS-1’ and ‘INS-2’) into the 18S gene of C westbyi n. sp., which may function as loop regions, they appear to be genetically distinct and different species. This is also supported by phylogenetic analysis, which also highlights some potential paraphyly between the three families, Cirolanidae, Aegidae and Corallanidae. Our morphological description of a new species of cirolanid along with a phylogenetic support using 18S sequence data for species within and around the Cirolanidae, provides greater context for the ‘Cirolana parva-group’. urn:lsid:zoobank.org:pub:71EBBA1C-E82A-4BBE-B567-3FE3359EEFA9

A taxonomic review of the branchial fish parasitic genus Elthusa Schioedte & Meinert, 1884 (Crustacea: Isopoda: Cymothoidae) from Indian waters, with the description of three new species

The genus Elthusa Schioedte & Meinert, 1884 from Indian waters is reviewed and three new species are described from India. A revised generic diagnosis is provided based on the type species and 13 species of Elthusa are regarded as Elthusa incertae sedis. Female stages of Elthusa fistularia sp. nov. collected from Fistularia petimba Lacepede,1803 and Elthusa pseudorhombus sp. nov. from Pseudorhombus dupliciocellatus Regan, 1905 are described based on the female. Elthusa uranoscopus sp. nov. from Uranoscopus guttatus Cuvier, 1829 described from female and male. The female and male stages of Elthusa samariscii (Shiino, 1951) are redescribed and the transitional and larval (premanca and manca) stages are described. All the species were collected from the southwest coast of India. Elthusa fistularia sp. nov. is distinguished by cephalon 1.20 times wider than long; pleotelson broadly rounded, 1.70 times as wide as long, lateral margin convex; widest pleon 0.80 width of widest pereon; uropod rami subequal; and antenna 9-segmented, antennular bases moderately wide set. Elthusa pseudorhombus sp. nov. is characterized by cephalon 1.70 times wider than long; widest pleon 0.75 width of widest pereon; pleotelson 1.50 times as wide as long, evenly rounded; antenna with 10 articles, antennal bases widely separated; and uropod endopod shorter than exopod. Elthusa uranoscopus sp. nov. can be identified by cephalon 1.60 times wider than long, moderately immersed in the pereonite 1; widest pleon 0.84 width of widest pereon; pleotelson 1.80 times as wide as long posterior margin rounded, lateral margins convex; antenna 11 articled, slightly longer than antennula, greatly wider antennal bases; and uropod rami, endopod longer than exopod.

New troglobitic species of Xangoniscus (Isopoda: Styloniscidae) from Brazil, with notes on their habitats and threats.

In the present work, five new species of Xangoniscus are described, increasing to eight the number of the known troglobitic species for the genus. Xangoniscus species can be distinguished from each other by the shape of pleonites epimera, the number and size of aesthetascs in the distal article of antennula, the modifications on pereopods, the shape of male pleopods and the proportion between uropod rami. Species from this genus are known for the states of Minas Gerais and Bahia with Xangoniscus aganju representing the northernmost occurrence, and X. lundi n. sp. and X. dagua n. sp. the southernmost occurrences. Of the six caves where specimens were collected, four are not registered in the national speleological database, what points to all the potential to yet be discovered regarding number of cavities and the associated biodiversity in Brazil. Some of the here mentioned type localities are not located inside protected areas, therefore exposing the species to risks related to the adjacent land use and consequent influence on water table level and input of food resources. The contribution of this work with descriptions of new troglobitic species provides support to consider them as plausible candidates to be assessed in the next list of threatened species as well as to elaborate conservation actions for the species, the caves where they inhabit and the surrounding landscape.

A new species of Bathynomus A. Milne-Edwards, 1879 (Malacostraca: Peracarida: Isopoda: Cirolanidae) from the upper Miocene of the Guadalquivir Basin (Spain).

Today representatives of the giant cirolanid isopods of the genus Bathynomus inhabit tropical to warm-temperate waters of the West Atlantic and the Indo-West Pacific. In not so distant geological past, however, the genus was present also in the Mediterranean, as documented by numerous fossils from the Plio-Pleistocene of Italy. Herein, a somewhat older occurrence of the genus is reported, from the North-East Atlantic. Based on a single posterior moult from the upper Miocene (Tortonian) of southwestern Spain, a new species is described. Bathynomus civisi sp. nov. differs from its congeners by both uropod rami having the obtuse distolateral corner produced as a distinct tip and a wider gap between the second and third side distal spines than between others. The new species is so far known only from the type locality in close vicinity of Arroyo Trujillo, in the municipality of Cantillana (Seville, Spain), where the marls of the Écija Formation are exposed. At the time of deposition of these marls, the area represented a part of the Norbetic Strait, a corridor connecting the North-East Atlantic with the Mediterranean. The new occurrence reported herein further supports the environmental preferences of the genus throughout its geological past for deep-marine settings.

A new genus of Munnopsidae Lilljeborg, 1864 (Crustacea, Isopoda), with descriptions of two abyssal new species from the Clarion Clipperton Fracture Zone, north-eastern tropical Pacific

A new deep-sea genus of the asellotan family Munnopsidae Lilljeborg, 1864, Pirinectes Malyutina & Brix gen. nov., including two new species, is described from the abyssal manganese nodule area of the Clarion Clipperton Fracture Zone in the north-eastern tropical Pacific. The new genus of the subfamily Eurycopinae Hansen, 1916, which is distinguished genetically, differs morphologically from the other six genera of this subfamily by the unique combination of the following characters: a rostrum approximately one third of the cephalon width and as long as antenna I article 1, with rounded margins, and the fingerprint pattern surface; pereonites 5 and 6 are fused dorsomedially, pereonite 7 is free; antenna I article 1 is without distomedial lobe and with small a distolateral projection; epipod of the maxilliped is less than two thirds of basis length and ovoid. Unique for the subfamily is the long pereopod II ischium, which is longer than the basis. Such characteristics can only be found in some munnopsid genera of the subfamily Munnopsinae Lilljeborg, 1864. Confirmed as distinct species by genetic analysis, the two new species can be morphologically distinguished from each other via a difference in width of the cephalon rostrum, the length of the palp and epipod of the maxilliped, length and width of distomedial lobes of pleopod 1, the width of carpi of the pereopods I, V and VI, and the different ratio of the uropod rami length. An illustrated identification key to the species of the Pirinectes gen. nov. is presented.

A new species of Calliopius (Crustacea: Amphipoda: Calliopiidae) from Japan

A new species of calliopiid amphipod, Calliopius ezoensis, from the eastern coasts of Hokkaido, Japan, is described and named. Calliopius ezoensis is similar to the North Atlantic C. sablensisBousfield & Hendrycks, 1997, but can be discriminated from it in possessing two rows of calceoli on the peduncular articles of antennae 1 and 2 of the female, having a mandibular palp of article 3 longer than article 2, and setation of epimeral plate 3 on the ventral submargin. The new species is distinguished from North Pacific congeners by a combination of characteristics: in having dorsally smooth pereonites, the number of marginal and submarginal setal rows on epimeral plate 2, setation of palp article 2 of maxilla 1, indistinct sexually dimorphic gnathopods 1 and 2, and the length ratio of the inner and outer rami of uropod 2. In addition to previously provided DNA sequences of nuclear histone H3 and mitochondrial 16S rRNA genes, nuclear 28S rRNA and mitochondrial cytochrome c oxidase subunit I sequences of this new species are provided for the future comparative purposes.