Small saddle shell
| Small saddle shell | ||||||||||||
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Small saddle shell ( Heteranomia squamula ) |
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| Systematics | ||||||||||||
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| Scientific name of the genus | ||||||||||||
| Heteranomia | ||||||||||||
| Winckworth , 1922 | ||||||||||||
| Scientific name of the species | ||||||||||||
| Heteranomia squamula | ||||||||||||
| ( Linnaeus , 1758) |
The Small saddle shell ( Heteranomia squamula ) is a shell - type from the family of anomiidae (Anomiidae). It is the type species and also the only species of the genus Heteranomia Winckworth, 1922. It is widespread in the North Atlantic .
features
The unevenly hinged housing of the small saddle shell is almost rounded and measures up to 2.3 cm in diameter. It is attached to the hard substrate with the right flap facing down by byssus . The calcified byssus emerges through a rounded to egg-shaped bay in the right flap. The housing shape is variable and is also determined by the subsurface. The edge of the case is irregular but smooth. The vertebra lies on the back about in the middle, slightly away from the dorsal edge. The ligament lies in a crescent-shaped pit under the vertebrae. The lower right flap is thin and translucent. The surface of the left, upper flap shows only rough, dense radial lines that can be spiky, but can also be missing. Otherwise the z. T. quite rough growth lines. The skin is greyish-white with a hint of pink. The lock edge is straight, the lock itself toothless. The left, upper valve shows (only) two muscle impressions, a dorsal, larger impression of the byssus retractor muscle and directly next to it a smaller impression of the sphincter muscle. The lower, right flap shows only the (one) sphincter impression.
Similar species
The small saddle shell has two adjacent muscle impressions in the left flap. The large saddle shell ( Monia patelliformis ) also has two muscle impressions. However, these are larger and clearly separated from each other. In addition, the radial sculptural elements dominate the large saddle shell. The saddle shell ( anomia ephippium ) has three muscle impressions in the left flap.
Geographical distribution and habitat
The species occurs in the North Atlantic from northern Norway and Iceland to North Africa. It penetrates in the Mediterranean as far as the Aegean Sea .
The animals live with the byssus attached to the hard substrate, often also on the shells of crabs from shallow water to a depth of over 700 meters.
Taxonomy
The taxon was set up by Carl von Linné in 1758 as Anomia squamula . It is the type and only species of the genus Heteranomia Winckworth, 1922.
supporting documents
literature
- Rudolf Kilias: Lexicon marine mussels and snails. 2nd edition, 340 p., Verlag Eugen Ulmer, Stuttgart 1997 ISBN 3-8001-7332-8 (p. 138)
- Fritz Nordsieck : The European sea shells (Bivalvia). From the Arctic Ocean to Cape Verde, the Mediterranean Sea and the Black Sea. 256 p., Gustav Fischer Verlag, Stuttgart 1969 (p. 60)
- Rainer Willmann: Mussels and snails of the North and Baltic Seas. 310 p., Neumann-Neudamm, Melsungen 1989, ISBN 3-7888-0555-2 (p. 88)
- Guido Poppe and Yoshihiro Goto: European Seashells Volume 2 (Scaphopoda, Bivalvia, Cephalopoda) . 221 pp., Verlag Christa Hemmen, Wiesbaden 1993 (2000 unc. Reprint), ISBN 3925919104 (p. 74)
On-line
Individual evidence
- ^ Carl von Linné: Systema naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Tomus I. Editio decima, reformata. Pp. 1–824, Holmiae / Stockholm, Salvius, 1758. Online at Göttingen Digitization Center (p. 701 as Anomia squamula ).
- ↑ World Register of Marine Species: Heteranomia squamula (Linné, 1758)
