Androgenic Gland and Secondary Sexual Characters in the Crayfish Procambarus Clarkii

1990 ◽  
Vol 10 (3) ◽  
pp. 492-497 ◽  
Author(s):  
Yoko Taketomi ◽  
Masahiro Murata ◽  
Mitsuharu Miyawaki
Keyword(s):  
Procambarus Clarkii ◽  
Androgenic Gland ◽  
Secondary Sexual Characters ◽  
Secondary Sexual

Relationships between body size and secondary sexual characters, and sperm characters in male Dolly Varden char (Salvelinus malma )

2016 ◽  
Vol 26 (3) ◽  
pp. 397-402 ◽  
Author(s):  
Toshiaki Yamamoto ◽  
Noritaka Hirohashi ◽  
Eiji Fujiwara ◽  
Tatsuya Suzuki ◽  
Hatsuna Maruta ◽  
...  
Keyword(s):  
Body Size ◽  
Dolly Varden ◽  
Salvelinus Malma ◽  
Dolly Varden Char ◽  
Secondary Sexual Characters ◽  
Sperm Characters ◽  
Secondary Sexual

5-Hydroxytryptaminergic control of testes development through the androgenic gland in the red swamp crayfish,Procambarus clarkii

1994 ◽  
Vol 26 (2) ◽  
pp. 127-132 ◽  
Author(s):  
RACHAKONDA SAROJINI ◽  
RACHAKONDA NAGABHUSHANAM ◽  
MILTON FINGERMAN
Keyword(s):  
Procambarus Clarkii ◽  
Androgenic Gland ◽  
Red Swamp Crayfish

Differentiation of the sexual characters and onset of maturity in the males of the "red claw" crayfish, Cherax quadricarinatus (Von Martens, 1898) (Astacidea, Astacida, Parastacidae)

2010 ◽  
Vol 60 (2) ◽  
pp. 195-208 ◽  
Author(s):  
Laura Susana López Greco ◽  
Fernanda Jimena Vazquez
Keyword(s):  
Sexual Maturity ◽  
Vas Deferens ◽  
Developmental Stages ◽  
Stage I ◽  
Early Event ◽  
Cherax Quadricarinatus ◽  
Secondary Sexual Characters ◽  
Single Structure ◽  
Red Claw Crayfish ◽  
Secondary Sexual

AbstractThe differentiation of the male reproductive system, the copulatory structures, "red patch" and onset of sexual maturity were studied in Cherax quadricarinatus. For this characterization 353 males were observed, dissected and processed for histological analysis. Three developmental stages were identified. At stage I the testes are two parallel cords with a few lobes or acinii, connected medially by a short thin bridge (X-shape) and the vasa deferentia are straight transparent cords. In the second stage, more lobulated testes present an H-shape and the vas deferens begins to differentiate into three distinct regions: proximal, medial and distal. In the last stage testes are two parallel cords tending to fuse along their entire length and become a single structure. From this stage, the development of the "red patch" occurs and spermatophore formation is observed in the vas deferens giving it white colour. These primary and secondary sexual characters could indicate the onset of sexual maturity. The morphology of the copulatory structure is lobular at stage I and it differentiates into an elongated structure during stage II. This study shows that in C. quadricarinatus the differentiation of primary and secondary sexual characters of males starts simultaneously and very early in development (0.09-0.10g achieved nearly 1 month old) and that acquisition of sexual maturity is also an early event (6g achieved nearly 3 month old). The compared features within Astacidea and Decapoda and the possible applications in the analysis of phylogenetic relationships between different taxa are discussed.

Limited Female Choice and the Evolution of Secondary Sexual Characters

1991 ◽  
Vol 138 (6) ◽  
pp. 1396-1407 ◽  
Author(s):  
Richard Gomulkiewicz
Keyword(s):  
Female Choice ◽  
Secondary Sexual Characters ◽  
Secondary Sexual

scholarly journals A new species of Sybistroma Meigen, 1824 (Diptera: Dolichopodidae) from China

2020 ◽  
Vol 418 ◽  
pp. 1-8
Author(s):  
I. Ya. Grichanov ◽  
Keyword(s):  
New Species ◽  
Yunnan Province ◽  
Hind Femur ◽  
Secondary Sexual Characters ◽  
A New Species ◽  
Secondary Sexual

A new species Sybistroma genriki sp. n. from the Yunnan province of China is described. It belongs to S. incisa group of species, differing from other species in mostly yellow antenna with arista-like stylus much longer than postpedicel; postpedicel elongated, much longer than wide, acute apically; stylus apical, with dark and white apical swelling; lower postocular setae white; legs mostly yellow except mostly black mid and hind coxae and brown-black distal spot on hind femur. A key to 11 species from Sichuan and Yunnan is provided, based mainly on male secondary sexual characters. The known distribution of the dolichopodine genus Sybistroma Meigen, 1824, is briefly discussed.

scholarly journals Male secondary sexual characters in Aphnaeinae wings (Lepidoptera: Lycaenidae)

2017 ◽  
Vol 48 (1) ◽  
Author(s):  
Zs. Bálint ◽  
A. Heath ◽  
A. Heath ◽  
G. Katona ◽  
K. Kertész ◽  
...  
Keyword(s):  
Secondary Sexual Characters ◽  
Secondary Sexual

Secondary Sexual Characters of Man

2017 ◽  
pp. 334-345
Keyword(s):  
Secondary Sexual Characters ◽  
Secondary Sexual
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