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Gonad structure in the river crab, Potamon fluviatile (Herbst, 1785) (Decapoda, Brachyura)

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image of Crustaceana

In this study some reproductive aspects of Potamon fluviatile are described. Data were obtained by studying the gonad structure of both sexes using histological methods. The ovary consists of a pair of long, sac-like organs, with a thin ovarian wall surrounding the oocytes and eggs. The ovarian epithelium creates several oogenetic pouches containing growing oocytes and mature eggs, while oogonia are concentrated in a germarium within the ovarian lumen. Eggs are ovulated from the oogenetic pouches into the central ovarian lumen, transferred into the oviduct, and fertilized with sperm stored in the spermatheca. The male reproductive system consists of paired testes, united by a commissure, and genital ducts. Gametes leave the testicular tubules and reach the proximal region of the vas deferens, where the epithelium shows secretory activity. In questo studio sono stati decritti alcuni aspetti della biologia riproduttiva di Potamon fluviatile, attraverso analisi prevalentemente morfologiche ed istologiche sulle gonadi di entrambi i sessi. L'ovario è costituito da una coppia di organi a forma di sacco, con un epitelio sottile che crea delle invaginazioni a forma di tasca con la funzione di accogliere sia oociti in fase di maturazione che uova mature, mentre gli oogoni sono organizzati all'interno del lume ovarico in gruppi ben definiti (germaria). Le uova, una volta rilasciate dalle tasche ovariche, passano nel lume e da qui, attraverso gli ovidutti, vengono depositate nella camera addominale e fecondate con gli spermatozoi conservati nella spermateca. Il sistema riproduttivo maschile, invece, consiste in una coppia di testicoli, uniti da un sottile tessuto connettivo, e da due dotti deferenti, la cui porzione prossimale mostra un'attività secretoria e dove i gameti, dopo aver lasciato i tubuli testicolari, vengono conservati fino alla loro emissione.

Affiliations: 1: Università degli Studi "Roma Tre", Dipartimento di Biologia, Viale G. Marconi 446, I-00146 Rome, Italy


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