Concave lentil shell
| Concave lentil shell | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Montacuta substriata | ||||||||||||
| ( Montagu , 1808) |
The concave lentil mussel ( Montacuta substriata ) is a type of mussel from the family of lentil mussels (Montacutidae). The species lives mainly commensally with the sea urchin Spatangus purpureus either with byssus attached to the anal spines or freely in the sediment near the anal opening of the sea urchin.
features
The housings, which have the same flaps, are up to three millimeters long. They are obliquely egg-shaped in outline and somewhat elongated towards the front. The housings are slightly unequal, the vertebra is slightly behind the center line. The front and rear edges are well rounded. The inner edge of the case is smooth. The internal ligament sits on a flat resilifer (ligament support) below and behind the vertebrae. In the right valve, the lock consists of an elongated, inclined cardinal tooth, which is directed forward and forms an acute angle with the anterior dorsal edge. The lock plate initially becomes wider towards the front edge. Here, next to the slightly overhanging anterior dorsal margin, a longitudinal pit is formed, into which the lateral tooth of the left valve "fits". In the left valve there is an anterior elongated lateral tooth. The surface line is not indented. The muscle impressions are indistinct. The anterior sphincter is slightly larger than the posterior sphincter.
The white shell is thin and translucent. The ornamentation consists of fine growth strips parallel to the edge, somewhat coarser growth interruptions and a few faint radial lines. The periostracum is thin and transparent.
Similar Art
The housing outline is more egg-shaped than z. B. that of the elongated lentil shell ( Tellimya ferruginosa ).
Geographical distribution and habitat
The distribution area of the species extends from Iceland and Northern Norway to the Mediterranean. The depth distribution is from about 200 m water depth to about 500 m water depth.
The animals live with byssus attached to the anal spines or freely in the sediment near the anal openings of the sea urchins Spatangus purpureus , Echinocardium flavescens and Echinocardium cordatum . These sea urchins prefer rather coarser sediment. Usually several animals, often even more than ten animals, live in the company of a sea urchin.
development
The animals are almost simultaneous hermaphrodites . Male and female genital organs exist at the same time in an individual. However, eggs are produced first, when they are deposited, only sperm are produced. The eggs are fertilized in the mantle cavity of the "females". The eggs continue to develop in the mantle cavity and are released into the open water as planktotrophic Veliger larvae in summer . The Veliger larvae stay in the plankton for several months before moving on to soil life and metamorphosis .
Taxonomy
The taxon was established by Montagu in 1808 as Ligula substriata . It is the type species of the genus Montacuta Turton, 1822.
supporting documents
literature
- John Gage: Observations on the bivalves Montacuta substriata and M. ferruginosa, 'commensals' with spatangoids. Journal of the Marine Biological Association of the United Kingdom, 46 (1): 49-70, 1966 doi : 10.1017 / S0025315400017549
- John Gage: The life-histories of the bivalves Montacuta substriata and M. ferruginosa, 'commensals' with spatangoids. Journal of the Marine Biological Association of the United Kingdom, 46 (3): 499-511, 1966 doi : 10.1017 / S0025315400033300
- Rudolf Kilias: Lexicon marine mussels and snails. 2nd edition, 340 p., Verlag Eugen Ulmer, Stuttgart 1997 ISBN 3-8001-7332-8 (p. 204)
- 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. 93/4)
- Guido Poppe. Yoshihiro Goto: European Seashells Volume 2 (Scaphopoda, Bivalvia, Cephalopoda) . 221 pp., Verlag Christa Hemmen, Wiesbaden 1993 (2000 unc. Reprint), ISBN 3925919104 (p. 87)
On-line
Individual evidence
- ↑ E. Oldfield: The functional morphology of Kellia suborbicularis (Montagu), Montacuta ferruginosa (Montagu) and M. substriata (Montagu), (Mollusca, Lamellibranchiata). Journal of Molluscan Studies, 34 (5): 255-295, London 1961 PDF
- ^ Georg Montagu: Supplement to Testacea Britannica. SI-V, 1-183, London, White 1808. Online at www.biodiversitylibrary.org (p. 25)
- ↑ MolluscaBase: Montacuta substriata (Montagu, 1808)
