Moderator: FYI the full citation is:
Gibson,Peter H (1996): Distribution of the cirratulid polychaetes
Dodecaceria fimbriata, D. concharum and D. diceria in European waters
between latitudes 48N and 70N. J. Mar. Biol. Assoc. U. K. 76, 625-635.
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Dear colleagues,
Recently, Peter Gibson described the distribution of three species of the
genus Dodecaceria in European waters (JMBA 76). The difference in the
distribution of D. fimbriata and D. concharum appear to be due to variation
in the salinity of the sea.
In our monitoring studies in the south-west of the Netherlands, ongoing
since 1990, we found seven specimens of Dodecaceria. As Hartmann-Schroder
(1971) only describes one species (D. concharum), we all identified them as
such. Most of the species are found in the Grevelingen, a saline lake
(chlorinity > 15.4 gCl/l, or a salinity of > 27.8 promille). But according
to Gibson (1996), D. concharum is only found when the salinity is above 34
promille. Therefore, we might have D. fimbriata instead of D. concharum.
We checked some specimen using his description on p. 626: "the crotchets of
D. fimbriata have a tooth at the proximal edge of the depression which is
absent in D. concharum". We didn't see the tooth, however. Either, we
misinterpret the description, or the specimen indeed are D. concharum.
Could anyone, therefore, give more information on the identifcation of both
species. Where can we find descriptions with illustrations?
Thanks in advance,
Johan Craeymeersch
craeymeersch at cemo.nioo.knaw.nl
Netherlands Institute of Ecology
Centre for Estuarine and Coastal Ecology
Vierstraat 28
NL-4401 EA Yerseke
The Netherlands
