Myida
| Myida | ||||||||||||
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Sand gape clam ( Mya arenaria ) |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Myida | ||||||||||||
| Stoliczka , 1870 |
The Myida are an order of the mussels (Bivalvia), which belong to the superordinate Heterodonta within the subclass Autolamellibranchiata . The first, somewhat questionable representatives of this group are known from the Carboniferous , the first reliable representatives from the Permian .
features
The housings of the Myida can be equally or unevenly hinged, most of the housings gape. The shell is usually thin and aragonitic with cross-lamellar microstructures without layers of mother-of-pearl. The lock is largely reduced in most forms. The ligament is located externally or internally on a chondrophore . There are sphincters of roughly the same size or sphincters of different sizes.
Geographical distribution, habitat and way of life
The Myida occurs worldwide. They live shallow to deeply buried in the soft sediment, or on the sediment. Accordingly, there are forms with very long siphons. The superfamily Pholadoidea drills in wood ("ship drilling shells").
Taxonomy
For reasons of priority, the order should actually be called Pholadida Chenu, 1862, because this name is older than the order name Myida Stoliczka, 1870. However, the strict international rules for zoological nomenclature only apply to species, genus and family level. The order is divided by some malacologists into two subordinates Myina and Pholadina. Others merely divide the order into two superfamilies. The MolluscaBase provides four superfamilies to the order Myida:
- Superfamily Dreissenoidea Gray, 1840
- Triangular clams family (Dreissenidae Gray, 1840)
- Superfamily Myoidea Lamarck, 1809
- Family basket mussels (Corbulidae Lamarck, 1818)
- Family Erodonidae Winckworth, 1932
- Clams family (Myidae Lamarck, 1809)
- Family Pleurodesmatidae Cossmann, 1909 †
- Family Raetomyidae Newton, 1919 †
- Superfamily Pholadoidea Lamarck, 1809
- Family lithophagous molluscs (Pholadidae Lamarck, 1809)
- Marine clams family (Teredinidae Rafinesque, 1815)
- Family Xylophagidae Purchon, 1941
- Superfamily Pleuromyoidea Zittel, 1895 † (with question mark)
- Family Ceratomyidae Arkell, 1934 †
- Family Pleuromyidae Zittel, 1895 †
- Family Vacunellidae Astafieva-Urbajtis, 1973 †
In the earlier classifications, the
- Gastrochaenoidea and the
- Hiatelloidea (e.g. elephant trunk clam ( Panopea abrupta ))
also placed under the order of Myida. Bieler & Mikkelsen (2006) transferred them to the Venerida order . For this, the superfamily Dreissenoidea, which is traditionally placed in the order Venerida, is now listed in the order Myida.
supporting documents
literature
- Michael Amler, Rudolf Fischer & Nicole Rogalla: Mussels . Haeckel library, volume 5. Enke Verlag, Stuttgart 2000 ISBN 3-13-118391-8 .
- Rüdiger Bieler & Paula M. Mikkelsen: Bivalvia - a look at the branches . Zoological Journal of the Linnean Society, 148: 223-235, London 2006.
- Norman D. Newell: Order Myoida Stoliczka, 1870. In: Raymond Cecil Moore (Ed.): Treatise on invertebrate paleontology. Mollusca, 6, Bivalvia 2. S.N690-N741, New York, 1969.
Individual evidence
- ↑ MolluscaBase: Myida
- ↑ Rüdiger Bieler, Paula M. Mikkelsen, Timothy M. Collins, Emily A. Glover, Vanessa L. González, Daniel L. Graf, Elizabeth M. Harper, John Healy, Gisele Y. Kawauchi, Prashant P. Sharma, Sid Staubach, Ellen E. Strong, John D. Taylor, Ilya Tëmkin, John D. Zardus, Stephanie Clark, Alejandra Guzmán, Erin McIntyre, Paul Sharp, Gonzalo Giribet: Investigating the Bivalve Tree of Life - an exemplar-based approach combining molecular and novel morphological characters. Invertebrate Systematics, 28: 32–115, 2014 doi : 10.1071 / IS13010