World Congress of Malacology Antwerp ... - Unitas Malacologica

values of micronuclei’s in Baltic mussels were detected in those collected from the Gulf of Gdansk
(6.7 MN/1000 cells), the lowest frequency of MN (0.37 MN/1000 cells) was found in mussels from
the reference site (Kvädöfjärden). In general, the frequency of micronuclei in gills of molluscs, which
were sampled in Lithuanian coastal areas are lower than in those, sampled in the Gulf of Gdansk. The
highest frequencies of nuclear abnormalities were observed in blue mussels from the Gulf of Gdansk,
(5.3 NB/1000 cells, 9.0 BN/1000 cells and 5.0 FA/1000 cells) (Sobieszewo, September 2002), the
lowest frequencies observed in mussels from the reference site (Kvädöfjärden). There was detected
site- and season-specific variation of MN incidences in mussels. Significantly higher frequencies of
micronuclei were detected in the gill cells of mussels which were sampled in autumn. Temperaturedependent
frequencies of MN and other nuclear abnormalities were shown in mussels from the
Gdansk Bay.
Taxonomical composition and morphological diversity of the genus Policordia (Bivalvia)
Safonova-Golovko, L.
Dept. of Invertebrate Zoology, Biological Faculty, Moscow State University, Moscow 119899
Russia,
Email: Policordia@yandex.ru
The genus Policordia (Bivalvia) comprises specialized carnivorous bivalves distributed all over the
World Ocean mainly in the bathyal and abyssal zones. Material studied contains 28 samples from
310 to 9050 m from Atlantic, Pacific and Indian Oceans obtained during a number of research
cruises of P.P.Shirshov Institute of Oceanology RAS. Altogether the collection includes 21 species,
out of them 12 are tentatively new.
Details of alimentary system, siphons, structure of ctenidia showed that morphological diversity in
this genus is higher than anticipated before. A cladistic analysis using shell and anatomy characters
supported two well-defined groups, one is subgenus Angustebranchia with 4 species and the other is
yet undescribed taxon comprising 4 species. Subgenus Policordia in current understanding seems
not to be monophyletic species group. The subgeneric level in Policordia requires revision.
Databases on scaphopod molluscs
Sahlmann, Bernd
Schmalfelder Str. 9c, D-26432 Lentfoehrden, Germany,
Email: b.sahlmann@gmx.de
The widespread information on scaphopod molluscs was compiled and put into MS-Access 2000
databases. The two main databases consist of all references on scaphopods (recent as well as fossil,
approx. 3800 entries) and of all scaphopod taxa (about 860 recent and 1280 fossil named species), as
far they are included into the Volumes of the Zoological Record, published in the scientific literature
or retrievable from the internet.
If available, the original diagnosis of the recent taxa was transcripted and included. Data on
synonyma, illustrations, distribution, biology, radula etc. are added as well. By means of built-in or
self createable queries selections and reports from the data can be performed, to reveal e.g. all green
colored scaphopods, Dentalium species with more than 12 ribs, or the members of the genus
Fissidentalium in an area. In this way a quick preselection of species could be made without
consulting a lot of sometimes not easily available papers first.
The databases are updated regularly and are published in the internet at bimonthly intervals.
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