Female Sternum Research Articles

Report of intersex individuals from a southeastern Chinese Choroterpes facialis (Gillies, 1951) population (Ephemeroptera: Leptophlebiidae)

Previously there were only three cases of mayfly gynandromorphism reported from Asia, occurring in the families Baetidae and Heptageniidae. Here, we report two intersex individuals of Choroterpes facialis (Gillies, 1951) (Ephemeroptera: Leptophlebiidae) from southeastern China. They have similar external morphologies (each having two different eyes, two shortened penes, and female sternum IX) but with one being predominately male and the other being predominately female (one with eggs in the abdomen, but the other apparently with sperm). We believe this to be the first report of a feminized male individual. This phenomenon implies their intersexuality is caused by some similar reasons, such as temperature or parasitism. Remarkably, two intersex specimens found among 1,736 normal individuals shows that gynandromorphism does occur rarely, and only six normal males in the sampling suggest the species C. facialis is partially parthenogenetic at least.

Study of gender determination in living adult male and female subjects by evaluating the size of sternum about north Indian population

Introduction: The gender determination from the skeletal remains is of very much interest in the field of medical science. Ashley GT -1956b formulated the 149 rule according to which a male sternum exceeded 149mm in length whereas the female sternum was less than 149mm. on the basis of previous researcher I have been planned to verify the external data and establish them in reference to population in and around Lucknow. With the help of this study we were distinguishes the male and female sternum bone in north zone of India as well as Uttar Pradesh. Materials and Methods: The above mentioned measurements have been further use to calculate various sternal dimensions and indices according to the technique described by Ashley. Each linear measurement has been taken thrice on the anatomical position of the sternum using Mitutoyo-digital vernier calipers to the nearest millimeter with precision of 0.01 mm. Discussion: This study was fully supported the previous researchers, who has done the work in morphometry of sternum bone in cadaver and skeletal of human, because they told that the sterna has distinguish in different zone of India, as well as it is shorter than European country. Conclusion: The comparison of mean length of manubrium, mesosternum and sternum ranged from 40.39-71.31 mm, 83.49-129.97 mm and 150.21-170.39 mm respectively in adult male (16-60yrs) where as in adult female ranged from 23.79-60.35 mm, 68.33-122.42 mm and 116.36-148.92 mm respectively. Keywords: Sternum bone, Gender determination, Length of manubrium, Length of mesostenum.

Rediscovery of the sponge crab Cryptodromia fallax (Latreille in Milbert, 1812) (Decapoda: Brachyura: Dromiidae) at Mauritius, with the description of a new genus and the confirmation of an unusual seaweed-carrying camouflage mode

AbstractCryptodromia fallax (Latreille in Milbert, 1812) has been serendipitously found again on the island of Mauritius, almost 200 yrs after its discovery. The new material provides new information about the structure of the female sternum, providing stronger evidence that a new genus, Alcockdromiagen. nov., is required. Observations show that this crab cuts out and carries pieces of seaweed in the manner of a paraglider, rather than pieces of sponge normally carried by dromiid crabs. The crab uses Ulva lactuca Linnaeus, a green alga, and Lobophora variegata (J.V. Lamouroux), a brown alga. This discovery shows that the last two prehensile dromiid pereopods, which are used to carry soft camouflage, are multi-purpose, having only minor structural differences allowing them to carry seaweeds.

Female secondary sexual traits in spiders: Adaptive interpretations of the sternum projection in the pholcid Holocnemus pluchei

Sexually dimorphic traits are the outcome of a network of selective pressures acting upon each sex. While male secondary sexual traits are frequently restricted to intrasexual competition, female ornaments or weapons are mostly associated to social interactions for the access to limited resources. Here we investigate a sexually dimorphic trait expressed within the female's sternum of the spider species Holocnemus pluchei (Pholcidae), and its adaptive maintenance under the three leading hypotheses: sexual receptivity signaling, mate choice and sexual conflict hypothesis. We provide fine-scaled behavioral descriptions of the copulatory behavior of Holocnemus pluchei, corroborating that mating interactions are mediated by the female's sternum projection. The single moment of contact between the female projection and male body occurs during sperm transfer, always followed by a reduction on the intensity of the male genital movement. Additionally, biometrical properties of the female sternum projection corroborate our functional interpretation for the trait as restricting the intensity of males' copulatory movements. We claim that female sternum projection is a sexually selected trait mediating sexual conflict, with several adaptive consequences upon the sexes.

Evaluation of Gender in Living Male and Female Children Through the Measurement of Sternum Bone in the Population of Uttar Pradesh

Introduction: Sex evaluation from the skeletal remains is of very much important for medicolegal aspects in the field of medical science. On the basis of previous researcher, I have been planned to verify the existrnal data and establish them in reference to population in and around Lucknow. With the help of this study we were distinguishes the male and female sternum bone in children. Subjects and Methods: The technique described by Ashley GT -1956b was used for measurement of sternum. Each linear measurement has been taken thrice on the anatomical position of the sternum using Mitutoyo-digital vernier calipers to the nearest millimeter with precision of 0.01 mm. Results: Discussion: The previous researchers told that the sternum has distinguished in different zone of India, and it is shorter than European country. Our findings of manubrium were 49.45±3.45 mm for male and 44.47± 5.79 mm for female children respectively. The study done by previous researcher was provided full support to our present finding. Conclusion: The comparison of mean length of manubrium, mesosternum and sternum between 2 to 15 yrs, female and male sternum between two groups, significantly different and higher length of manubrium, mesosternum and sternum in males as compared to females children.

Determination of stature from female sternum in central Delhi population

Determination of stature from female sternum in central Delhi population

Loneuroides García Aldrete (Psocodea: ‘Psocoptera’: Ptiloneuridae): new species and first record for Brazil

Loneuroides is registered for the first time in Brazil. A new species from the Brazilian state of Bahia, is here described and illustrated. It differs from all the other species in the genus in details of the female ninth sternum and by number of primary branches in vein M of fore- and hind- wings. A map with the distribution of the species of Loneuroides is included.

Determination of sex From the Human Adult sternum: An Autopsy Based study

Determination of sex from the skeletal remains is of immense importance in the field of forensic medicine. Various anthropometric studies conducted in this part of the globe have demonstrated sternum as an important tool for determination of sex when less specific/sex indicative bones are available. This study aims to study, compare and analyze the sterna measurements among both sexes and evaluate the reliability of different parameters to determine sex from an adult sternum. 120 sterna (65 male and 55 female) were collected from the autopsy. After cleaning and drying for three weeks, three readings each were taken and the averages of the results were recorded in millimeters. Metric data was summarized as mean, standard deviations and percentage proportions. Among the five parameters used it was proven that the width of the sternum at the level of 4th rib was the most reliable parameter in determining the sex. The application of Hyrtl's law to the study proved that 40% of male sterna and 98.18% of female sterna obeyed it. The application of Ashley's rule of 149 and 136 revealed that 81.66% of male sterna and 90% of female sterna could be sexed accurately.

Determination of Stature from Sternum in Central Delhi Population

Identification is one of the important aspects dealt with in forensic anthropology. It is necessary in cases of mass disasters or otherwise when no clue is present regarding the identity of individual. Bones have been used previously for identification by determining race, age, sex and stature. However, limited studies for estimation of stature from Sternal bone are available in literature. This study was conducted on a population of Delhi, India, to assess the usefulness of Sternal bone for determining stature. Results indicated that length of the Manubrium (R=0.631, SEE=5.67) is a useful parameter for stature estimation from female sternum while length of Mesosternum (R=0.0.098, SEE=7.28) and Sternal length (R=0.192, SEE=7.181) are not effective parameters. Regression equations were developed for each parameter. We also find that regression equations developed by researchers for other population samples are not useful for our population sample.

Osteometric analysis for sexing of modern sternum - an autopsy study from South India.

Estimation of sex is considered as one of the essential parameters in forensic anthropology and requires foremost attention in the analysis of commingled and unidentified remains. In India, there is a paucity of population specific morphometric standards for identifying sex from unknown human remains in different population groups. The present research is an osteometric analysis to study the sexual dimorphism of the sternum of South Indian origin using statistical considerations. The study sample constituted of adult autopsied sternums of known age and sex. Five linear measurements (length of the manubrium, mesosternum, manubrium and mesosternum together, and width at 1st and at 3rd sternebra) were examined during the study. Three indices (manubrio-corpus Index, ratio of the length of the mesosternum and manubrium, and sternubrial-width index) were computed from the length and width measurements of the sternum. Statistical analysis was done using SPSS computer software and Student's t-test was applied to find the sex differences in these variables. While statistically significant sex differences were observed for all the five linear measurements of the sternum, none of the sternal indices showed statistically significant sex differences. Discriminant function and logistic regression analysis were performed to derive the predicting models for estimation of sex from the different variables. The predictability of sternal measurements in sexing using univariate models ranged between 67.5% for the width at 3rd sternebra and 74.4% for the combined length of manubrium and mesosternum. The classification accuracy rates of sternal measurements were observed to be higher when multivariate analysis was performed. Length of manubrium and mesosternum together along with width at 1st sternebra yielded maximum accuracy of 79.5% (discriminant function analysis) and 81.2% (logistic regression analysis) in sexing of male and female sternum. The present research concludes that the application of sternum in sex estimation should be restricted to cases when other more reliable bones for sexing are not available to the investigators.

Description of Alloretochus sigillatus new species with comments and new distributional records for Alloretochus peruanicus (Ephemeroptera, Caenidae, Brachycercinae)

Alloretochus sigillatus sp. nov. is described from adults of both sexes and eggs from Bolivia and Ecuador. Diagnostic characters of this species include: large body size, ratio pedicel/scape 1.75, presence of posteromedian projection on metanotum, characteristic blackish marks on abdominal terga, presence of vestiges of posterolateral projections on abdomen segments IV-VI, male subgenital plate broadly emarginated posteriorly, ratios forceps length/subbasal width 8.9, female sternum IX produced distally reaching apex of segment X, tapering distally with rounded apex, egg with 4 costae in lateral half. Additional characters for all stages and SEM photographs of eggs are provided for Alloretochus peruanicus, with new records of its presence in Argentina, Bolivia, Peru and Colombia.

Morphometric analysis of variation in the sternum with sex and age.

Age and sex-related variations in sternum morphology may affect the thoracic injury tolerance. Male and female sternum size and shape variation was characterized for ages 0-100 from landmarks collected from 330 computed tomography scans. Homologous landmarks were analyzed using Procrustes superimposition to produce age and sex-specific functions of 3D-sternum morphology representing the combined size and shape variation and the isolated shape variation. Significant changes in the combined size and shape variation and isolated shape variation of the sternum were found to occur with age in both sexes. Sternal size increased from birth through age 30 and retained a similar size for ages 30-100. The manubrium expanded laterally from birth through age 30, becoming wider in relation to the sternal body. In infancy, the manubrium was 1.1-1.2 times the width of the sternal body and this width ratio increased to 1.6-1.8 for adults. The manubrium transformed from a circular shape in infancy to an oval shape in early childhood. The distal sternal body became wider in relation to the proximal sternal body from birth through age 30 and retained this characteristic throughout adulthood. The most dramatic changes in sternum morphology occur in childhood and young adulthood when the sternum is undergoing ossification. The lesser degree of ossification in the pediatric sternum may be partly responsible for the prevalence of thoracic organ injuries as opposed to thoracic skeletal injuries in pediatrics. Sternum fractures make up a larger portion of thoracic injury patterns in adults with fully ossified sternums. The lack of substantial size or shape changes in the sternum from age 30-100 suggests that the increased incidence of sternal fracture seen in the elderly may be due to cortical thickness or bone mineral density changes in the sternum as opposed to morphological changes.

A study of sexual dimorphism in human sterna

In the present study, 100 human, dry adult sterna, 45 male and 55 female, from various medical colleges of Saurashtra region of Gujarat were measured for length of manubrium, length of mesosternum and combined length of manubrium and mesosternum. The data was statistically analysed for mean, standard deviation and p value. “The Rule of 136” given by Ashley (1956) was applied to determine the sex of sterna and to determine the number of male and female sterna obeying the rule. Statistically significant difference in mean values of length of manubrium, length of mesosternum and combined length of both sexes was observed. “Rule of 136” determined 34 male and 66 female sterna, while 71.11% (32) of male sterna and 96.34% (53) of female sterna obeyed the rule. It concluded that of all the three parameters measured, combined length of manubrium and mesosternum was the best discriminating parameter of sex and Rule of 136 was helpful in determination of sex.

Description and phylogeny of a new Neotropical genus of Acalyptini (Coleoptera: Curculionidae: Curculioninae) associated with the staminodes of Cyclanthaceae

The weevil genusAzotoctla gen. nov. (Coleoptera: Curculionidae: Curculioninae: Acalyptini Thomson), is described to accommodate the following 15 new Neotropical species: Azotoctla aecuatorialis sp. nov. (Ecuador), Azotoctla anerunca sp. nov. (Ecuador), Azotoctla angustacra sp. nov. (Ecuador), Azotoctla curvirostra sp. nov. (Peru), Azotoctla dasygastra sp. nov. (Costa Rica and Honduras), Azotoctla femorata sp. nov. (Colombia, Costa Rica, Ecuador and Panama), Azotoctla gomezi sp. nov. (Colombia, Costa Rica and Panama), Azotoctla gottsbergeri sp. nov. (Brazil), Azotoctla clemmyssa sp. nov. (Colombia), Azotoctla melolauta sp. nov. (Colombia), Azotoctla migueli sp. nov. (Colombia), Azotoctla nana sp. nov. (Panama), Azotoctla punctata sp. nov. (Costa Rica), Azotoctla tibiatra sp. nov. (Belize), and Azotoctla tuberquiai sp. nov. (Colombia). Azotoctla is placed in the tribe Acalyptini, subtribe Staminodeina Franz, thus representing the sister taxon of Staminodeus Franz. The monophyly of Azotoctla is supported by the following inferred traits: a noncarinate rostrum that is tumescent above the antennal insertion in males; equilaterally subtriangular hemisternites of the male sternum 8; paired, longitudinal, laterally positioned sclerites of the aedeagus; and a bifurcate lamina of the female sternum 8, which bears explanate, diverging furcal arms. A key to the species of Azotoctla is provided; and the salient features of each species are illustrated and presented along with distributional and natural history data. A morphological cladistic analysis of 23 terminal species (eight outgroup, 15 ingroup) and 33 characters yielded a single most parsimonious cladogram (length = 75 steps, consistency index = 52, retention index = 77), with the ingroup topology ((A. aecuatorialis, (A. anerunca, A. gottsbergeri)), (A. punctata, ((A. angustacra, A. nana), (A. tibiatra, (A. clemmyssa, (A. curvirostra, A. femorata)), (A. melolauta, ((A. gomezi, A. migueli), (A. dasygastra, A. tuberquiai))))))). Species of Azotoctla are reproductively associated with the ephemeral staminodes of different members of the Neotropical monocot family Cyclanthaceae; most commonly with the widespread genus Carludovica Ruiz & Pavon. The interspecific homogeneity in external morphology, coupled with marked differences in genital traits and an apparent absence of narrow geographical ranges mediated by either host plants and/or biogeographical factors, jointly suggest that the diversification of Azotoctla is a relatively recent phenomenon and driven strongly by sexual selection. © 2012 The Linnean Society of London, Zoological Journal of the Linnean Society, 2012, 166, 559–623.

A New Species ofParacatuaMelichar (Cicadellidae: Cicadellinae) from Colombia

ABSTRACT: A new species is added to the genus Paracatua (Cicadellidae: Cicadellinae) from Colombia, P. decastroi n. sp. We propose additional characters to the description of P. rubrolimbata that complements the definition of the genus and allows outlining a species group named here as rubrolimbata, keeping in mind the similarities of the new species with the type species. This is an attempt to bring a clearer and comprehensive view of the genus considering the attributes shared among the Colombian species. As a result of the analysis we propose here a species group characterized by the following new characters shared by P. decastroi n. sp. and P. rubrolimbata: nearly rectangular foveae laterad of the ocelli; surface of pronotum flanges concave; scutellum bulging dorsally; forewings with rounded whitish spots; female sternum VII wider than long with a median halfmoon shaped depression that bears an apical and bulging cuticle sclerotization.

Melathra huyenaeFranz, a New Genus and New Species of Entimine Weevil (Coleoptera: Curculionidae: Entiminae) from Southwestern Hispaniola

Melathra huyenae Franz, new genus and new species, is described to accommodate an enigmatic species of entimine weevil (Coleoptera: Curculionidae: Entiminae) from southwestern Hispaniola. The new genus is closely related to Apotomoderes Dejean and therefore placed in the tribe Geonemini Gistel, but is distinguished by the following unique suite of features: labial palps 2-segmented; post-epistomal region not depressed; scrobe passing over eye; profemur with a small cuticular tooth; metatibial apex simple; elytral humeri not well-defined; wings reduced; female sternum VIII elliptical; spermatheca with corpus swollen; and aedeagus with groups of setae present in dorsal subapical region, flagellum sclerotized, and with paired anterior, narrowly plicate sclerites. The single constituent species M. huyenae is characterized by a uniformly grey-silver to brown scale coverage which is most conspicuously interrupted by two anteromesally positioned rusty brown spots on the elytra. Melathra huyenae is apparently narrowly endemic to the coastal dry forest habitat of the Jaragua National Park. The host plant associations remain unknown.

Density, body size and sex ratio of an indigenous spider along an altitudinal gradient in the sub-Antarctic

AbstractAlthough spiders are a diverse and ecologically important group of predators across the sub-Antarctic islands, relatively little is known about their biology. Here we provide data on the abundance, body size variation and sex ratio of an indigenous spider,Myro kerguelenensis, across an altitudinal gradient on Marion Island. In so doing we test explicitly the hypotheses that density will decline with declining resource availability at higher elevations, and that a converse Bergmann body size cline will be found in this species. Density ofM. kerguelenensisdecreased with altitude and ranged from a mean density of 5.3 (SD 3.42) individuals per m2at 50 m a.s.l. to a mean density of 0.83 (SD 1.15) individuals per m2at 600 m a.s.l. Mean female sternum width was 1.39 mm (SD 0.44) and mean male sternum width was 1.40 mm (SD 0.22). No evidence for Bergmann or converse Bergmann clines was found. At increasing altitudes, sex ratios became increasingly female-biased with populations at 600 m a.s.l. comprising 0.87 (SD 0.28) females, on a proportional basis, possibly as a result of resource limitation and an increase in the prevalence of sexual cannibalism. The food web implications of this study are highlighted.

A new genus and species of Agalliinae from Brazil (Hemiptera: Cicadellidae)

A new genus, Paranagallia, and a new species, P. takiyae sp. n., are described and illustrated from south Brazil. Paranagallia gen. n. can be distinguished from all other known genera of Agalliinae by morphological features such as: crown truncate in dorsal view, and in frontal view bearing well-developed foveae; face and pronotum strongly flattened; pronotum striated; pygofer L-shaped; styles not forked; subgenital plates fused to each other; segment X bearing sword-shaped processes; female pregenital sternum reduced and first tarsomere of the metathoracic tibiae bearing two platellae. Chaetotaxy characters of the metathoracic legs are for the first time illustrated through scanning electron microscopy.

Nine New Species of Coronigoniella from Colombiaand Peru, South America (Hemiptera: Cicadellidae: Cicadellinae)

Nine new species are added to the genus Coronigoniella Young. They include C. bartletti from Peru, C. cornuta, C. circula, C. elongata, C. ancora, C. bella, C. cerulata, C. extenda and C. undulata from Colombia. The female seventh sternum of C. caquetana Young is also illustrated for the first time.

A new genus, Fibragallia, with descriptions of new species from central America and Mexico (Homoptera: Cicadellidae: Agalliinae)

A new genus, Fibragallia, type-species Agallia bidigitata Oman. is established for the Agallia bidigitata species group. Seven new species in the complex are described and illustrated: F. tridigitata from Panama, mexicana from Mexico and paradigitata, similis, grandigitata, lamina, and biclava from Costa Rica. Diagnostic characters in the female seventh sternum are elucidated. Fibragallia bidigitata (Oman) is designated as a new combination. A key to species, a discussion of generic relationships and distribution of the genus and species complex are presented.