TESTIS AND ANDROGENIC GLAND DURING DEVELOPMENT OF EXTERNAL SEXUAL CHARACTERISTICS OF THE CRAYFISH PROCAMBARUS CLARKII
TESTIS AND ANDROGENIC GLAND DURING DEVELOPMENT OF EXTERNAL SEXUAL CHARACTERISTICS OF THE CRAYFISH PROCAMBARUS CLARKII
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克氏原螯虾外性特征发育过程中的睾丸和雄激素腺
DOI：
10.1163/193724096x00243
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发表时间：
1996
影响因子：
1.1
通讯作者：
S. Koga
中科院分区：
文献类型：
--
作者：
Y. Taketomi;S. Nishikawa;S. Koga
雄激素腺是甲壳动物的上皮内分泌腺，已知可控制男性性征的分化和功能。然而，在克氏原螯虾（Decapoda，Reptantia）中，该腺体的功能尚不清楚。在本研究中，观察了雄性小龙虾睾丸发育、第二性征（即交配附属器）和雄激素腺之间的关系。雄性小龙虾第一对和第二对腹部附属器(即交配附属器)的形态分化分为5个阶段，从A阶段到E阶段。在A阶段，雄激素腺已经出现。 A期腹部附属器也出现了雄性外部形态特征。在 B 阶段，腺体很小并且呈延长线状。 B期至C期，雄激素腺细胞数量增多，腺细胞较大。在B和C阶段，第一和第二腹部附件完全分化。具有 A 阶段附属物的小龙虾的睾丸尚未成熟。观察到B阶段精原细胞数量的增加、C阶段精子发生的增加以及D阶段精子从睾丸中释放的情况。这些结果表明雄激素腺控制分化、睾丸发育和第二性征。
The androgenic glands, which are epithelial endocrine glands of Crustacea, are known to control differentiation and functioning of the male sexual characteristics. In the crayfish Procambarus clarkii (Decapoda, Reptantia), however, the function of this gland is not clear. In the present study, the relationships among development of the testis, secondary sexual characteristics (i.e., the copulatory appendages), and the androgenic gland in male crayfish were observed. Morphological differentiation of the first and second pairs of abdominal appendages (i.e., the copulatory appendages) of male crayfish were divided into 5 stages, from stage A to stage E. At stage A, the androgenic glands had already appeared. The male characteristics of external morphology appeared on the abdominal appendages at stage A also. At stage B, the glands were small and had the appearance of an extended string. From stage B to stage C, the number of androgenic gland cells increased, and the gland cells were large. At stages B and C, the first and second abdominal appendages were completely differentiated. Testes of crayfish with stage A appendages are immature. Increase in the number of spermatogonia at stage B, spermatogenesis at stage C, and release of spermatozoa from the testis at stage D, were observed. These results suggest androgenic gland control of differentiation, development of the testes, and secondary sexual characteristics.