Sexual pattern and caudal fin as a sexually dimorphic trait in the commercially aquacultured Meiacanthus blennies (Teleostei: Blenniidae)

2019 ◽  
Vol 51 (5) ◽  
pp. 1221-1234
Author(s):  
Diego Okuma ◽  
June F. Dias ◽  
Helcy L. N. Silbiger ◽  
Arthur Z. Güth ◽  
Miguel Mies
Keyword(s):  
Sexually Dimorphic ◽  
Caudal Fin ◽  
Sexual Pattern

scholarly journals Sexual dimorphism in species of Schistura (Teleostei: Nemacheilidae) from the Mae Khlong basin and peninsular Thailand

Zootaxa ◽  
2012 ◽  
Vol 3586 (1) ◽  
pp. 353 ◽  
Author(s):  
RUNGTHIP PLONGSESTHEE ◽  
F. WILLIAM H. BEAMISH ◽  
LAWRENCE M. PAGE
Keyword(s):  
Sexual Dimorphism ◽  
Environmental Factors ◽  
The Other ◽  
Sexually Dimorphic ◽  
Morphometric Characteristics ◽  
Pectoral Fin ◽  
Caudal Fin

Sexually dimorphic characteristics are described for four species of Schistura from the Mae Khlong basin and peninsularThailand. Males of S. mahnerti have a suborbital flap and rows of unculi on the upper surfaces of the pectoral-fin rays.Females of S. mahnerti have a suborbital groove. None of the morphological measurements differ significantly betweenmales and females of S. mahnerti. In the other three species, S. aurantiaca, S. cf. aurantiaca, and S. sexcauda, all indi-viduals lack the flap or groove, but most males have a conspicuous black botch on the procurrent rays of the upper lobeof the caudal fin, a feature absent in most females. Some morphometric characteristics vary between sexes of these spe-cies. Sexually dimorphic traits presumably have a function related to reproduction; however, little is known about reproduction in Schistura, and variation in morphology in relation to habitat or other environmental factors has not been studied.

Boraras naevus, a new species of miniature and sexually dichromatic freshwater fish from peninsular Thailand (Ostariophysi: Cyprinidae)

Zootaxa ◽  
2011 ◽  
Vol 3002 (1) ◽  
pp. 45 ◽  
Author(s):  
KEVIN W. CONWAY ◽  
MAURICE KOTTELAT
Keyword(s):  
New Species ◽  
Freshwater Fish ◽  
Colour Pattern ◽  
Sexually Dimorphic ◽  
Caudal Fin ◽  
Dorsal Fin ◽  
Fin Ray ◽  
A New Species ◽  
Lateral Scale ◽  
Pelvic Fin

Boraras naevus, new species, is described from peninsular Thailand. It is distinguished from other congeners by features of its sexually dimorphic colour pattern, principal caudal-fin, pelvic-fin and branched dorsal-fin ray counts, lateral scale row counts, and a number of osteological features.

Gephyrocharax machadoi, a new species of Stevardiinae (Characiformes: Characidae) from the Rio Paraguai basin, central Brazil

Zootaxa ◽  
2018 ◽  
Vol 4415 (1) ◽  
pp. 161
Author(s):  
KATIANE M. FERREIRA ◽  
ÉRIKA DE FARIA ◽  
ALEXANDRE C. RIBEIRO ◽  
JÚLIO C. O. SANTANA ◽  
IRANI QUAGIO-GRASSIOTO ◽  
...  
Keyword(s):  
New Species ◽  
Sexually Dimorphic ◽  
Body Depth ◽  
Caudal Fin ◽  
Mato Grosso ◽  
Central Brazil ◽  
Fin Rays ◽  
A New Species

Gephyrocharax machadoi, new species, is described from tributaries of the rio Sepotuba, upper rio Paraguai basin, Mato Grosso state, Brazil. The new species is distinguished from its congeners, except Gephyrocharax major, by presenting two modified scales on the ventral caudal-fin lobe (pouch scales): a larger, sexually dimorphic scale, slightly superior and anterior in position, followed by a smaller, posterior and ventrally placed accessory scale (vs. a single modified pouch scale without ventrally placed accessory scales). Gephyrocharax machadoi differs from G. major by presenting a gap (more conspicuous in mature males than in mature females) between the second and third ventral procurrent caudal-fin rays (vs. second and third ventral procurrent caudal-fin rays near each other or fused distally); premaxilla with tricuspid teeth (vs. tetra- to pentacuspid teeth); and body depth 21.5–25.4% of SL (vs. 25.9–36.8% in SL). Spermiogenesis and spermatozoa morphology are also described. 

A new species of glass-perch from Belitung Island, Indonesia (Teleostei: Ambassidae: Gymnochanda)

Zootaxa ◽  
2011 ◽  
Vol 3085 (1) ◽  
pp. 55
Author(s):  
HEOK HUI TAN ◽  
KELVIN K. P. LIM
Keyword(s):  
New Species ◽  
Sexually Dimorphic ◽  
Caudal Fin ◽  
Dorsal Fin ◽  
A New Species

Gymnochanda verae, new species, a small, colourful and sexually dimorphic freshwater glassperch, is described from the Gantung area of Pulau Belitung, Indonesia. It shares with its congeners a scale-less body, but differs in the males having broad red anal and second dorsal fins, red caudal-fin lobes, and the elongated rays of the second dorsal fin and the anal fin joined throughout their length by an interradial membrane.

Androgen-induced plasticity at a “vocal” neuromuscular synapse

1994 ◽  
Vol 52 ◽  
pp. 32-33
Author(s):  
Darcy B. Kelley ◽  
Martha L. Tobias ◽  
Mark Ellisman
Keyword(s):  
Xenopus Laevis ◽  
Motor Neurons ◽  
Sexual Differentiation ◽  
Molecular Basis ◽  
Neuromuscular Synapse ◽  
Sexually Dimorphic ◽  
Intracellular Protein ◽  
Developmental Program ◽  
Androgen Action ◽  
Clawed Frog

Brain and muscle are sexually differentiated tissues in which masculinization is controlled by the secretion of androgens from the testes. Sensitivity to androgen is conferred by the expression of an intracellular protein, the androgen receptor. A central problem of sexual differentiation is thus to understand the cellular and molecular basis of androgen action. We do not understand how hormone occupancy of a receptor translates into an alteration in the developmental program of the target cell. Our studies on sexual differentiation of brain and muscle in Xenopus laevis are designed to explore the molecular basis of androgen induced sexual differentiation by examining how this hormone controls the masculinization of brain and muscle targets.Our approach to this problem has focused on a highly androgen sensitive, sexually dimorphic neuromuscular system: laryngeal muscles and motor neurons of the clawed frog, Xenopus laevis. We have been studying sex differences at a synapse, the laryngeal neuromuscular junction, which mediates sexually dimorphic vocal behavior in Xenopus laevis frogs.

The Relationship of Digit Ratio (2D:4D) and Gender-Role Orientation in Four National Samples

2007 ◽  
Vol 28 (2) ◽  
pp. 78-87 ◽  
Author(s):  
Stefan J. Troche ◽  
Nina Weber ◽  
Karina Hennigs ◽  
Carl-René Andresen ◽  
Thomas H. Rammsayer
Keyword(s):  
Gender Role ◽  
Sex Role ◽  
Role Orientation ◽  
Sexually Dimorphic ◽  
Gender Role Orientation ◽  
Left Hand ◽  
Fourth Finger ◽  
And Gender ◽  
Relationship Of ◽  
The Relationship

Abstract. The ratio of second to fourth finger length (2D:4D ratio) is sexually dimorphic with women having higher 2D:4D ratio than men. Recent studies on the relationship between 2D:4D ratio and gender-role orientation yielded rather inconsistent results. The present study examines the moderating influence of nationality on the relationship between 2D:4D ratio and gender-role orientation, as assessed with the Bem Sex-Role Inventory, as a possible explanation for these inconsistencies. Participants were 176 female and 171 male university students from Germany, Italy, Spain, and Sweden ranging in age from 19 to 32 years. Left-hand 2D:4D ratio was significantly lower in men than in women across all nationalities. Right-hand 2D:4D ratio differed only between Swedish males and females indicating that nationality might effectively moderate the sexual dimorphism of 2D:4D ratio. In none of the examined nationalities was a reliable relationship between 2D:4D ratio and gender-role orientation obtained. Thus, the assumption of nationality-related between-population differences does not seem to account for the inconsistent results on the relationship between 2D:4D ratio and gender-role orientation.

Chemogenetic inhibition of dopaminergic projections to the nucleus accumbens has sexually dimorphic effects in the rat gambling task.

2020 ◽  
Vol 134 (4) ◽  
pp. 309-322 ◽  
Author(s):  
Tristan J. Hynes ◽  
Jacqueline-Marie M. Ferland ◽  
Tanya L. Feng ◽  
Wendy K. Adams ◽  
Mason M. Silveira ◽  
...  
Keyword(s):  
Nucleus Accumbens ◽  
Sexually Dimorphic ◽  
Gambling Task

PKA signaling drives reticularis differentiation and sexually dimorphic adrenal cortex renewal

2018 ◽  
Author(s):  
Dumontet T ◽  
Sahut-Barnola I ◽  
Septier A ◽  
Montanier N ◽  
Plotton I ◽  
...  
Keyword(s):  
Adrenal Cortex ◽  
Sexually Dimorphic
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