We are reviewing Ephesiella and Sphaerodorum in the North East Atlantic. These guys are tricky! Therefore we have opted to use molecular tools to try and sort the lineages - potential species - present in these waters.
I would consider some of the features you mention with care (specially if you are working with fixed material). Eyes are not always visible, chaetae in fist segment are in most cases absent in the specimens we have studied (but they may have hooks instead - also sometimes not protruded). Not sure what you mean by dorsal cirri - macro or microtubercles? (The terminology used in this groups is also not very helpful either!)
We think there are some undescribed species in the area, but it is (very) hard to find consistent and non-overlapping morphological characters to tell them apart. You will hopefully see more about this story soon.
Best wishes, Maria
Systematics and Evolution Group
Coordinator of ForBio
NTNU University Museum
Norwegian University of Sciences and Technology
NO-7491 Trondheim, Norway
From: annelida-bounces from oat.bio.indiana.edu [mailto:annelida-bounces from oat.bio.indiana.edu] On Behalf Of Ole Gorm Norden Andersen
Sent: fredag 26. januar 2018 11.37
To: annelida from net.bio.net <annelida from magpie.bio.indiana.edu>
Subject: [Annelida] a new Sphaerodorum ?
Dear fellow polychaetologists,
Does the following description fit a known species?
A 6mm long Sphaerodorum, identical to the Sphaerodorum gracilis figured and described by Hartmann-Schröder 1996 pp. 238-9 (as S. flavum) except there are no eyes, first segment after the prostomium has a parapodium with no setae and no dorsal cirrus (the size of the papilla next to the dorsal cirrus on the following segments), much like in Sphaerodoropsis philippi shown on her page 237, and the dorsal micropapillae are not scattered but arranged in transverse rows of which there are 4 per segment, each made up of 8-10 papillae. The larger papilla next to the dorsal cirrus is not part of a row. The setae are mostly simple needlelike and a few are like in Hartmann-Schröders fig. 107 b and c.
Can anyone help me out?
Ole Gorm Norden Andersen, scientific assistant, marine biologist Aarhus University, Bioscience Frederiksborgvej 399 DK 4000 Roskilde Denmark
e-mail: oa from bios.au.dk<mailto:oa from bios.au.dk>