Sexual dimorphism in mid-Cretaceous silvanid beetles from northern Myanmar (Coleoptera, Silvanidae, Brontinae)

2019 ◽  
Vol 2 (3) ◽  
pp. 289-296 ◽  
Author(s):  
CHENYANG CAI ◽  
DIYING HUANG
Keyword(s):  
Sexual Dimorphism ◽  
Small Group ◽  
Fossil Record ◽  
Female Genitalia ◽  
Burmese Amber ◽  
Male And Female ◽  
Morphological Variations ◽  
Limited Sampling ◽  
Morphological Convergence ◽  
Dead Trees

Silvanidae is a small group of cucujoid beetles, and their fossil record is poorly documented. The two recently described genera from Burmese amber, Cretoliota Liu et al. and Protoliota Liu et al., are distinctive among all known Silvanidae, displaying markedly long antennae and mandibular horns in males, as found in the extant Uleiota Latreille. Due to the limited sampling of fossil specimens, the morphological variations of male mandibular horns remain a mystery. Here we report six well-preserved specimens of Protoliota with both male and female genitalia exposed from mid-Cretaceous Burmese amber. Our discovery confirms the presence of remarkable sexual dimorphism in Protoliota. Males of Protoliota antennatus Liu et al. display short to very long mandibular horns and much longer antennae. Interesting morphological convergence of the beetles (Silvanidae and Staphylinidae) living under the bark of dead trees is briefly discussed. Our discovery represents the first definitive sexual dimorphism in beetles from Burmese amber.

scholarly journals First fossil record of the mayfly family Vietnamellidae (Insecta, Ephemeroptera) from Burmese Amber confirms its Oriental origin and gives new insights into its evolution

ZooKeys ◽  
2021 ◽  
Vol 1036 ◽  
pp. 99-120
Author(s):  
Roman J. Godunko ◽  
Alexander V. Martynov ◽  
Arnold H. Staniczek
Keyword(s):  
Male Genitalia ◽  
Fossil Record ◽  
New Genus ◽  
Outer Margin ◽  
Burmese Amber ◽  
Male And Female ◽  
China And India ◽  
Extant Species

The small, monophyletic mayfly family Vietnamellidae Allen, 1984 has so far only been known from a few extant species of the genus Vietnamella Tshernova, 1972, which are all distributed in the Oriental Realm (Vietnam, Thailand, China, and India). Herein we report the first fossil record of Vietnamellidae based on a male and female imago from Mid-Cretaceous Burmese amber. We establish the new genus Burmellagen. nov. to accommodate these two new Mesozoic specimens. Their attribution to Vietnamellidae is supported by the rounded shape of the hind wings with arched outer margin, the course of thoracic sutures, and characteristics of venation, especially of MP and Cu of the forewings and associated intercalary veins of the cubital field. At the same time, Burmellagen. nov. clearly differs from Vietnamella by a diminished number of longitudinal and cross veins in the hind wings, and by the different shape of male genitalia. This first fossil record of Vietnamellidae supports an age of at least 100 Ma for this taxon.

Revision of New Caledonian species of Eumolpinae described by K. M. Heller (Coleoptera: Chrysomelidae)

Zootaxa ◽  
2011 ◽  
Vol 3060 (1) ◽  
pp. 31-46 ◽  
Author(s):  
JESÚS GÓMEZ-ZURITA
Keyword(s):  
New Species ◽  
Sexual Dimorphism ◽  
New Caledonia ◽  
Female Genitalia ◽  
Careful Study ◽  
Male And Female ◽  
New Information ◽  
Taxonomic Research ◽  
New Material ◽  
First Time

The Chrysomelidae of New Caledonia are rich and unique, but insufficiently characterized. New species are being rapidly described, sometimes without careful study of the earlier taxonomic research. Karl M. Heller (Dresden, Germany) described in 1916 seven species of Eumolpinae which are redescribed here to distinguish them from other known species and to provide new information about sexual dimorphism and genitalic structures. New material is used to redefine their distribution. The males of Dematochroma lepros (Heller, 1916) and D. culminicola (Heller, 1916), and the female of D. difficilis (Heller, 1916) are described for the first time. Male and female genitalia are first described for seven and five species, respectively. D. difficilis (Heller, 1916) stat. rev., is revalidated from previous synonymy with D. terastiomerus (Heller, 1916). Lectotypes are designated for D. humboldtiana and D. terastiomerus.

The terminalia of the superfamily Scarabaeoidea (Coleoptera): specific glossary, dissecting methodology, techniques and previously unrecorded sexual dimorphism in some difficult groups

2020 ◽  
Author(s):  
Joana P Cristóvão ◽  
Fernando Z Vaz-De-Mello
Keyword(s):  
Sexual Dimorphism ◽  
Literature Review ◽  
Female Genitalia ◽  
Sexually Dimorphic ◽  
Male And Female ◽  
First Time

Abstract The terminology used for the morphological structures of the abdomen as well as male and female genitalia across the superfamily Scarabaeoidea is discussed, based on a literature review across the group. Issues relating to the orientation of the male terminalia and potential homologies between the ‘genital capsule’- and ‘spiculum gastrale’-bearing taxa are discussed and standardisation of terminology pertaining to some ambiguous terms is proposed. A Scarabaeoidea-specific glossary is presented, and synonyms across the literature are given. Schematic illustrations of the abdomen and terminalia are provided. Some new morphological structures are here described for the first time. A standardised dissection protocol for male and female Scarabaeoidea is proposed. Sexually dimorphic structures in the abdomen of Pleurosticti (Dynastinae, Rutelinae, Melolonthinae and Cetoniinae), Glaphyridae, Phaenomeridinae, Passalidae and Omorgus (Trogidae) are described and illustrated for the first time, providing future workers with the possibility to determine the sex of specimens based on external characters without the need for dissection.

Evolution of the cloacal and genital musculature, and the genitalia morphology in liolemid lizards (Iguania: Liolaemidae) with remarks on their phylogenetic bearing

2018 ◽  
Vol 39 (1) ◽  
pp. 63-78 ◽  
Author(s):  
Matías Quipildor ◽  
Virginia Abdala ◽  
Roy Santa Cruz Farfán ◽  
Fernando Lobo
Keyword(s):  
Sexual Dimorphism ◽  
Male Genitalia ◽  
Anatomical Variations ◽  
Female Genitalia ◽  
Phylogenetic Study ◽  
Male And Female ◽  
The Third ◽  
Phylogenetic Hypotheses ◽  
First Time

In this study, we describe the intra- and interspecific anatomical variations of cloacal and related muscles of male and female genitalia in species of five iguanian genera (three liolemid:Ctenoblepharys,Liolaemus, andPhymaturusplusDiplolaemusleopardinusandTropidurusmelanopleurusas outgroups). We found variations (seventeen characters) in topology, origin and insertion areas, tendon morphology and size of the musculature of this region. We also describe the variations of hemipeneal morphology, which is especially notable for the hemipenis ofC. adspersa,D. leopardinus, andT. melanopleurus, as this is first time they are described in the literature. Among the most significant findings are the identification of three new muscles, two of them inserted on the roof of the cloacal chamber (anterior and posterior cloacal retractor) and the third inserted superficially in the floor of the cloaca, just before anterior to the precloacal glands row (superficialis cloacalis retractor). We report sexual dimorphism in seven muscle characters. Musculature related to hemiclitoris is reduced in proportion to its size in comparison to the degree of development of male genitalia and associated musculature. The evolution of characters was traced on the known phylogenetic hypotheses of relationships among families. Characters taken from the cloacal/genital myology bring similar support to the liolaemid tree even rooting the analysis using different outgroups. In addition, a phylogenetic study using only myological characters was performed. In this case,C. adspersawas found to be more related toLiolaemusspecies instead of being basal toLiolaemusplusPhymaturus.

A review of the little known genus Wockia (Lepidoptera: Urodidae) in Russia

2016 ◽  
Vol 25 (1) ◽  
pp. 173-179
Author(s):  
S.Yu. Sinev
Keyword(s):  
East Asia ◽  
Zoological Institute ◽  
Female Genitalia ◽  
Palaearctic Species ◽  
Male And Female ◽  
First Time ◽  
Subjective Synonym

Three species of the genus Wockia Heinemann, 1870, which are so far known in Russia are reviewed; their male and female genitalia are illustrated, and a key for identification is provided. Two species, W. koreana Sohn, 2008, and W. magna Sohn, 2014, which were recently described from East Asia, are for the first time reported from Russia. The investigation of the holotype of W. funebrella Heinemann, 1870, discovered in the collection of the Zoological Institute RAS (St Petersburg), confirmed that this species is a junior subjective synonym of W. asperipunctella (Bruand, 1851). The distribution of Palaearctic species of the genus is discussed shortly.

Comparative assessment of average clinical smile parameters in male and female patients with orthognathic occlusion

2020 ◽  
Vol 25 (2) ◽  
pp. 121-126
Author(s):  
V. G. Galonsky ◽  
N. V. Tarasova ◽  
V. V. Aliamovskii ◽  
I. S. Leonovich
Keyword(s):  
Sexual Dimorphism ◽  
Male And Female ◽  
Young Males ◽  
Young Females ◽  
Female Patients ◽  
Evaluation Of Parameters ◽  
Distinguishing Features ◽  
Vertical Size ◽  
Relative Concept ◽  
The Ideal

Relevance. Separate issues in anthropomorphic sizes of relative norm of the ideal smile, its qualitative and qualitative parameters have not been addressed to sufficiently and are not properly reflected in scientific literature.Purpose. To determine distinguishing features in average smile parameters of the smile in male and female patients with orthognathic occlusion.Materials and methods. A clinical and anthropometric evaluation of parameters in main smile types was carried out for 150 young males and 150 young females aged 19-24 who had identical physiological development parameters.Results. It has been revealed that occurrence frequency of main smile types in patients with orthognathic occlusion has pronounced signs of sexual dimorphism which in over one half of the cases lies in predominance of the incisal smile type in males (52.7%) and the fascial type in females (55.3%). Occurence frequency of the cervical smile type totaled 25% among the studied patients of both genders. Average vertical size parameters in the incisal smile lies within the diapason of 3.91-4.91mm with surpassing by 1mm in males. Analogical data for the fascial smile type form the diapason of 6.21-6.73mm with surpassing by 0.52mm in females. The cervical smile type is characterised by larger vertical size forming the diapason of 7.94-8.91mm with surpassing by 0.97mm in males.Conclusion. The results of the study have shown that the “beautiful and ideal smile” is a relative concept having varied anthropometric characteristics and pronounced signs of sexual dimorphism lying in a broad spectrum of the dentofacial system norm notion with specific vectors for individual morphological deviations.

scholarly journals Sex-dependent dynamics of metabolism in primary mouse hepatocytes

2021 ◽  
Author(s):  
Luise Hochmuth ◽  
Christiane Körner ◽  
Fritzi Ott ◽  
Daniela Volke ◽  
Kaja Blagotinšek Cokan ◽  
...  
Keyword(s):  
Gene Expression ◽  
Amino Acid ◽  
Sexual Dimorphism ◽  
New Drugs ◽  
Model Systems ◽  
Specific Gene ◽  
Primary Hepatocytes ◽  
Alcoholic Fatty Liver ◽  
Male And Female ◽  
Primary Mouse

AbstractThe liver is one of the most sexually dimorphic organs. The hepatic metabolic pathways that are subject to sexual dimorphism include xenobiotic, amino acid and lipid metabolism. Non-alcoholic fatty liver disease and hepatocellular carcinoma are among diseases with sex-dependent prevalence, progression and outcome. Although male and female livers differ in their abilities to metabolize foreign compounds, including drugs, sex-dependent treatment and pharmacological dynamics are rarely applied in all relevant cases. Therefore, it is important to consider hepatic sexual dimorphism when developing new treatment strategies and to understand the underlying mechanisms in model systems. We isolated primary hepatocytes from male and female C57BL6/N mice and examined the sex-dependent transcriptome, proteome and extracellular metabolome parameters in the course of culturing them for 96 h. The sex-specific gene expression of the general xenobiotic pathway altered and the female-specific expression of Cyp2b13 and Cyp2b9 was significantly reduced during culture. Sex-dependent differences of several signaling pathways increased, including genes related to serotonin and melatonin degradation. Furthermore, the ratios of male and female gene expression were inversed for other pathways, such as amino acid degradation, beta-oxidation, androgen signaling and hepatic steatosis. Because the primary hepatocytes were cultivated without the influence of known regulators of sexual dimorphism, these results suggest currently unknown modulatory mechanisms of sexual dimorphism in vitro. The large sex-dependent differences in the regulation and dynamics of drug metabolism observed during cultivation can have an immense influence on the evaluation of pharmacodynamic processes when conducting initial preclinical trials to investigate potential new drugs.

Systematic revision and cladistic analysis of the South American genus Endeius Coiffait & Sáiz (Coleoptera: Staphylinidae)

2008 ◽  
Vol 39 (4) ◽  
pp. 381-406 ◽  
Author(s):  
Mariana Chani-Posse de Maus
Keyword(s):  
Cladistic Analysis ◽  
Identification Key ◽  
External Morphology ◽  
Female Genitalia ◽  
Valid Species ◽  
South American ◽  
The South ◽  
Systematic Revision ◽  
Male And Female

AbstractThe genus Endeius Coiffait & Sáiz, 1968 (Staphylininae: Staphylinini), distributed from Chile and Argentina through Juan Fernández Is. and Galapagos Is., is revised using characters of external morphology and male and female genitalia. Endeius comprises seven valid species: E. punctipennis (Solier), E. nitidipennis (Solier), E. subpunctipennis Coiffait & Sáiz, E. loensis Coiffait & Sáiz, E. franzi Sáiz, E. lugubris Sáiz and E. ovaliceps Coiffait. Belonuchus multipunctatus (Coiffait), comb. nov., is excluded from Endeius. An identification key to all species of the genus is provided. Monophyly of Endeius, as considered in the present study, is supported by one synapomorphy from the external morphology. Within the genus, the best supported subgroup consists of E. punctipennis (Solier), E. subpunctipennis Coiffait & Sáiz, E. loensis Coiffait & Sáiz and E. ovaliceps Coiffait.

Four new species of the subfamily Phycitinae (Lepidoptera: Pyralidae) from Kazakhstan

2021 ◽  
Vol 30 (1) ◽  
pp. 116-130
Author(s):  
E.V. Tsvetkov
Keyword(s):  
New Species ◽  
Female Genitalia ◽  
Male And Female ◽  
Lepidoptera Pyralidae ◽  
West Kazakhstan

Trachypteryx electrica sp. nov. is described from West Kazakhstan. The new species significantly differs from other species of the genus Trachypteryx Ragonot, 1893 in the female genitalia: the ductus bursae is strongly reduced and the diverticulum is absent. Two species of the subgenus Bazaria Ragonot, 1887 of the genus Gymnancyla Zeller, 1848, G. turanica sp. nov. and G. latialata sp. nov., are described from the Kyzylorda Province of Kazakhstan. Christophia constricta sp. nov. is described from the same locality. The male and female genitalia are illustrated for all species described.

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