Whitish moon shell
| Whitish moon shell | ||||||||||||
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Whitish moon shell ( Lucinella divaricata ) |
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| Systematics | ||||||||||||
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| Scientific name of the genus | ||||||||||||
| Lucinella | ||||||||||||
| Monterosato , 1884 | ||||||||||||
| Scientific name of the species | ||||||||||||
| Lucinella divaricata | ||||||||||||
| ( Linnaeus , 1758) |
The whitish moon shell ( Lucinella divaricata ) is a shell -Art from the family of lucinidae (Lucinidae). It is the only living species of the genus Lucinella Monterosato , dating from 1884. The species lives in symbiosis with sulfur-oxidizing bacteria in low-oxygen and high-hydrogen sulfide sediments.
features
The moderately inflated, equal-folding cases are approximately round with a diameter of 5 to 10 millimeters, rarely up to 13 millimeters. The vertebra sits almost in the middle and is bent forward inwards, so it protrudes at the dorsal edge. The housings are also almost equilateral, only the anterior dorsal edge is slightly concave. The short lunula is sunk deep. The ligament is also deep, about a third to a quarter of the length of the posterior dorsal margin and about 30 ° to the posterior dorsal margin.
In the right valve there is a large triangular cardinal tooth and two small side or lateral teeth, in the left valve there are two cardinal teeth and two small lateral teeth each in front and behind.
The two sphincters are about the same size or leave equally large impressions at the attachment points. The surface line is entire without indentation. The periostracum is straw yellow and very thin, mostly not or only at the edge. The shell itself is white to slightly cream-colored and shiny. The ornamentation consists of fine growth stripes, occasionally with clearer concentric lines, which can be traced back to irregular growth. The growth lines are crossed diagonally by fine furrows. They rise from the rear edge, are bent in the middle in a wavy manner and then fall again at an angle to the front edge. The oblique lines are often broken at the growth irregularities. The edge of the case is very finely indented due to the sloping lines.
Geographical distribution and habitat
The distribution area of the whitish moon mussel extends from the British Isles ( Cornwall , Southern Irish Sea , English Channel ) to Madeira and the Canary Islands as well as the Mediterranean and Black Sea .
The species lives in symbiosis with sulfur-oxidizing bacteria in low-oxygen and high-hydrogen sulfide sediments.
Taxonomy
The taxon was set up as Tellina divaricata by Carl von Linné as early as 1758 . It is the only species of the genus Lucinella Monterosato , 1884 and de facto type species of the genus. The formal type of the genus Lucinella is Lucina commutata Philippi , 1836 (by monotype); however, it is a more recent synonym of Lucinella divaricata ( Linné , 1758).
Tellina divaricata Linné , 1758 was also assigned to the genus Divaricella von Martens , 1880 in older literature . Occasionally, Lucinella Monterosato , 1884, was considered a subgenus of Divaricella . The World Register of Marine Species treats Lucinella Monterosato , but in 1884 as a separate genus.
Younger synonyms of Lucinella divaricata ( Linnaeus , 1758) are Cardium arcuatum Montagu , 1803, Lucina commutata Philippi , 1836 and Divaricella divaricata var. Elata Bucquoy, Dautzenberg & Dollfuss , 1896.
supporting documents
literature
- S. Peter Dance, Rudo von Cosel (arrangement of the German edition): The great book of sea shells. 304 p., Verlag Eugen Ulmer, Stuttgart 1977, ISBN 3-8001-7000-0 (p. 245)
- Rudolf Kilias: Lexicon marine mussels and snails. 2nd edition, 340 p., Verlag Eugen Ulmer, Stuttgart 1997, ISBN 3-8001-7332-8 (p. 176)
- 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. 83/4)
- Guido Poppe, Yoshihiro Goto: European Seashells Volume 2 (Scaphopoda, Bivalvia, Cephalopoda) . 221 pp., Verlag Christa Hemmen, Wiesbaden 1993 (2000 unc.Reprint ), ISBN 3925919104 (p. 82)
- Rainer Willmann: Mussels and snails of the North and Baltic Seas. 310 p., Neumann-Neudamm, Melsungen 1989, ISBN 3-7888-0555-2 (p. 118)
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. 677 as Tellina divaricata ).
- ↑ World Register of Marine Species: Lucinella divaricata (Linné, 1758)
annotation
- ↑ There are contradicting information in the literature about the number and arrangement of the lateral lock teeth. Fritz Nordsieck states that there is a posterior tooth and a pit in each of the right and left flaps.
