Falster-Astarte
| Falster-Astarte | ||||||||||||
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| Astarte falsteri | ||||||||||||
| Høpner Petersen , 2001 |
The Falster-Astarte ( Astarte falsteri ) is a mussel - kind from the family of the Astarten (Astartidae). The taxonomic status as an independent species is doubted by some authors. It is endemic to the coastal waters of the western Baltic Sea .
features
The same-hinged case of the holotype measures 23 mm in length, 19.1 mm in height and 9.3 mm in cross-section. It is rounded triangular in outline or cross-ovoid. It is clearly unequal, and the vertebrae are in front of the midline. The anterior dorsal margin is slightly concave and slopes steeply. The posterior dorsal margin is slightly convex and slopes significantly less. The front end is more rounded than the rear end. The ventral margin is well arched. The ligament is external. The lunula is only indistinct. The area , on the other hand, is clearly limited, but relatively narrow-lanceolate. The lock of the right valve has three main or cardinal teeth, a bulky main tooth, which is surrounded by deep pits, and a thin main tooth each in front and behind. There is also an anterior posterior tooth and an indistinct posterior posterior tooth. In the left, a deep pit is delimited in front and behind by two smaller main teeth. Both teeth are notched at the top. There is also an indistinct anterior posterior tooth and a clear posterior posterior tooth.
The two sphincter impressions are almost the same size, but comparatively small. The anterior sphincter impression is kidney-shaped, the foot muscle is clearly separated from it. The posterior sphincter impression is rounded and square. The foot muscle connects directly to the sphincter muscle and forms a kind of grip. The surface line is not indented.
The ornamentation consists of fine ribs parallel to the edge. The thick periostracum is dark brown, does not flake and has an oily sheen. The inside is white and the inside edge of the case is smooth.
Geographical distribution and habitat
The Falster-Astarte has a very limited distribution area in the Baltic Sea , between the Danish islands of Falster and Bornholm . It also occurs in the German part of the Baltic Sea.
It lives there, buried shallowly in muddy bottoms or muddy sandy bottoms at a depth of 20 to 70 meters.
Taxonomy
The species was first described in 2001 by Godtfred Høpner Petersen . The MolluscaBase treats the taxon as a valid species, as does the “Compendium of Bivalves”. The “HELCOM Checklist for Baltic Sea Invertebrate Species”, on the other hand, puts it in the synonymy of Astarte borealis .
literature
- Godtfred Høpner Petersen: Studies on some Arctic and baltic Astarte species (Bivalvia, Mollusca). Meddelelser om Grønland, Bioscience, 52: 1-71, Copenhagen 2001, p. 58
Individual evidence
- ^ A b Fritz Gosselck, Alexander Darr, Jürgen HJ Jungbluth, Michael Zettler: Trivial names for mollusks of the sea and brackish water in Germany. Mollusca, 27 (1): 3-32, 2009 PDF
- ↑ Natural History Museum Rotterdam: Astarte falsteri Høpner Petersen, 2001 (picture!)
- ↑ a b Markus Huber: Compendium of Bivalves. A full-color guide to 3,300 of the world's marine bivalves. A status on Bivalvia after 250 years of research. 901 pp., 1 CD-ROM, Hackenheim, ConchBooks, 2010, p. 246.
- ↑ MolluscaBase: Astarte falsteri Høpner Petersen, 2001
- ↑ Tytti Kontula and Jannica Haldin (eds.) Janis Birzaks, Ulrich Breitenbach, Martynas Bucas, Paulina Brezska, Natalia Chernova, Vladimir Fedorov, Ann-Britt Florin, Ronald Fricke, Karin Furhaupter, Anders Galatius, Marika Gerb, Elena Glazkova, Piotr Gruszka , Hanna Hahn, Martti Hario, Christof Herrmann, Tero Härkönen, Vadims Jermakov, Gustav Johansson, Ivar Jussi, Anna Karlsson, Olle Karlsson, Hans Kautsky, Jan Kieckbusch, Kirsi Kostamo, Nikolay Kovalchuk, Ari Laine, Georg Martin, Alexey Maximov, Markku Mikkola-Roos, Petri Nummi, Ivar Ojaste, Iwona Psuty, Justyna Scumlicz, Krzysztof Skora, Antra Stipniece, Henrik Svedäng, Michael Svensson, Martin Tjernberg, Kaire Torn, Konstantin Tylik, Lauri Urho, Francesca Vitale, Alexandra Volodina HEL, Michael Zettler: HELCOM Checklist for Baltic Sea Species. 278 p., Helsinki Commission, Helsinki, undated (2012) PDF