The peristomium is the first true body segment in an annelid worm's body in the anterior end. It is directly behind the prostomium and contains the mouth, tentacular cirri, and sometimes feeding palps, which may instead occur on the prostomium. If an eversible pharynx is present, it is contained in this segment as well, and can fill up to 20 segments when inverted, depending on the species.
The prostomium and peristomium can be variously fused, either completely distinct, or comprising a joint structure of a peristomial ring and a tentacular crown.[1]
^Beesley, Pamela; Graham J. B. Ross; Christopher J. Glasby (2000). Polychaetes & Allies: The Southern Synthesis. Fauna of Australia. Vol. 4A Polychaeta, Myzostomida, Pogonophora, Echiura, Sipuncula. Melbourne, Australia: CSIRO Publishing. pp. 11–12. ISBN0-643-06571-7.
January 01, 1970
peristomium, peristomium, first, true, body, segment, annelid, worm, body, anterior, directly, behind, prostomium, contains, mouth, tentacular, cirri, sometimes, feeding, palps, which, instead, occur, prostomium, eversible, pharynx, present, contained, this, s. The peristomium is the first true body segment in an annelid worm s body in the anterior end It is directly behind the prostomium and contains the mouth tentacular cirri and sometimes feeding palps which may instead occur on the prostomium If an eversible pharynx is present it is contained in this segment as well and can fill up to 20 segments when inverted depending on the species The prostomium and peristomium can be variously fused either completely distinct or comprising a joint structure of a peristomial ring and a tentacular crown 1 See also editProstomium PygidiumReferences edit Beesley Pamela Graham J B Ross Christopher J Glasby 2000 Polychaetes amp Allies The Southern Synthesis Fauna of Australia Vol 4A Polychaeta Myzostomida Pogonophora Echiura Sipuncula Melbourne Australia CSIRO Publishing pp 11 12 ISBN 0 643 06571 7 Retrieved from https en wikipedia org w index php title Peristomium amp oldid 1205630466, wikipedia, wiki, book, books, library,
