SINOHESIONE-GENITALIPHORA GEN ET SP-N (POLYCHAETA, HESIONIDAE), AN INTERSTITIAL ANNELID WITH UNIQUE DIMORPHOUS EXTERNAL GENITAL ORGANS

Autor(en): WESTHEIDE, W
PURSCHKE, G 
MANGERICH, W
Stichwörter: Evolutionary Biology; GLAND ADHESIVE SYSTEM; ULTRASTRUCTURE; Zoology
Erscheinungsdatum: 1994
Herausgeber: PERGAMON-ELSEVIER SCIENCE LTD
Journal: ZOOLOGICA SCRIPTA
Volumen: 23
Ausgabe: 2
Startseite: 95
Seitenende: 105
Zusammenfassung: 
A new hesionid, Sinohesione genitaliphora gen. et sp. n., is described from intertidal sandy sediments of Hainan Island, China. It differs from hitherto known hesionids by the presence of external genital organs in both sexes. In the males there is one pair of sac-like appendages, each bearing a tube-shaped penis, on chaetiger 10. In the females the paired sac-shaped organs are situated on chaetiger 12. Reconstructions of semi- and ultrathin sections show that a long, heavily coiled sperm duct opens at the tip of each penis. The duct opens with a ciliated funnel into a seminal vesicle in chaetiger 9. Prominent gland cells surround the sperm duct for the most part. The female genital organs each have two openings; one of which leads to a blind ending seminal receptacle. The other is the external pore of a ciliated oviduct that originates as an open funnel in the coelom of chaetiger 10. The functional and phylogenetic significance of these structures is discussed.
ISSN: 03003256
DOI: 10.1111/j.1463-6409.1994.tb00378.x

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