Zaiden Sérgio Fonseca, Brinn Richard Phillip, Marcon Jaydione Luiz, Urbinati Elisabeth Criscuolo
Department of Biology, University of Rio Verde - FESURV, Campus Universitário, s/n. Rio Verde, Goiás, CEP: 75901-970. Brazil.
Zygote. 2011 Aug;19(3):245-53. doi: 10.1017/S0967199410000298. Epub 2010 Aug 23.
The cururu stingray Potamotrygon cf. histrix, a new and endemic Amazonian freshwater species, presents appropriate characteristics for fish keeping and is exploited from its natural environment. The present study identified the testicular structure and spermatogenesis of this species. Gonads from adult male specimens were dissected, fixed and processed for histological analysis. The testes were of testicular/epigonial type. The presence of germinal papillae was observed in the upper portion of organ with primordial germ cells and Sertoli cell precursors. The testis was lobular with zonal organization and cystic gametogenesis, with the occurrence of spermatoblasts. The Sertoli cells underwent morphological modifications over the course of gamete formation. The spermatozoids had long heads and were spiraled on their own axis. Information on the reproductive biology will serve as basis for studies on the reproduction and phylogeny of this peculiar group of cartilaginous fish.
库鲁魟鱼（Potamotrygon cf. histrix）是一种新的亚马逊特有淡水物种，具有适合饲养的特性，且正从其自然环境中被开发利用。本研究确定了该物种的睾丸结构和精子发生过程。解剖、固定并处理成年雄性标本的性腺以进行组织学分析。睾丸为睾丸/生殖上皮型。在器官上部观察到有生发乳头，其中含有原始生殖细胞和支持细胞前体。睾丸呈小叶状，具有带状组织和囊性配子发生，存在精母细胞。支持细胞在配子形成过程中发生形态变化。精子头部较长，且自身呈螺旋状。关于生殖生物学的信息将为研究这一特殊软骨鱼类群体的繁殖和系统发育提供基础。
