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Defaecation in the stem nematode, Ditylenchus dipsaci
Author(s) -
Doncaster C. C.,
Seymour Malcolm K.
Publication year - 1976
Publication title -
journal of zoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0952-8369
DOI - 10.1111/j.1469-7998.1976.tb04659.x
Subject(s) - biology , anatomy , rectum , nematode , ecology , medicine
The process of defaecation in the stem nematode, Ditylenchus dipsaci , has been analysed using cinemicrography. During feeding regular shortenings of the hind end of the body are accompanied by groups of a few defaecation periods. Each period begins as the shortened hind body re‐elongates, and consists of several defaecation cycles. In each cycle the posterior rectum becomes dorsally bowed and, as it straightens, the rectal valve, rectum and anus open. Faeces pass out irregularly while the rectum remains open and are forcibly expelled as it closes. Defaecation in D. dipsaci is intermediate between that of the high‐pressure nematode Aphelenchoidzs blastophthorus and the low‐pressure passive feeder Hexatylus viviparus. We suggest that the main function of defaecation in plant nematodes is to excrete excess water.