[Annelida] RE: Unknown freshwater nemertean from The Netherlands

Norenburg, Jon via annelida%40net.bio.net (by NORENBUR from si.edu)
Tue Feb 22 18:04:11 EST 2011

A turbellarian, Prorhynchus I believe. Chris Laumer, cc'd here will know be more informative.


Jon L Norenburg
Invertebrate Zoology
Smithsonian National Museum of Natural History
Washington DC

From: Fauchald, Kristian
Sent: Tuesday, February 22, 2011 12:13 PM
To: Norenburg, Jon
Subject: FW: Unknown freshwater nemertean from The Netherlands

This is really your business, I believe

From: annelida-bounces from oat.bio.indiana.edu [mailto:annelida-bounces from oat.bio.indiana.edu] On Behalf Of Haaren, Ton van
Sent: Tuesday, February 22, 2011 11:04 AM
To: annelida from magpie.bio.indiana.edu
Subject: [Annelida] Unknown freshwater nemertean from The Netherlands

Dear annelid specialists,

Excuse me for bothering with a question on a presumed Nemertea. In a tributary of the river Rhine near Rotterdam, The Netherlands, we found an unknown Nemertea. It was collected using a pond net. Sandy sediment, fresh water. The species was accompanied by the annelid worm Propappus volki, a typical member of the interstitial invertebrate assemblage in sandy rivers and brooks, and also a species with a proboscis. The only freshwater Nemertea we know of is the genus Prostoma. This specimen however shows no eyes (Prostoma has eyes) and inside the head, a stylet is present, unlike Prostoma. We have tried to identify the specimen with Gibson's 1994 key on the British nemerteans, which made clear is should be a Hoplonemertea species. The only freshwater (or terrestrial) member of this order is Argonemertes dendyi, a terrestrial species, living under and among decaying organic material. As this doesn't fit our specimen, we were unable to identify it using this key. As we suspect an European species or even a new invader, we want to use this forum for any help. There are some oligochaet like bifid chaetae visible, but we don´t think that they belong to this species but are either the remains of their prey (oligochaetes) or just part of the sediment.
Does anyone know the identity of our specimen?
By the way, the photo's show a preserved specimen.

With best wishes
Ton van Haaren and David Tempelman

Senior analist's
Grontmij Nederland B.V.

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