Devonia perrieri

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Devonia perrieri
Devonia perrieri (from Anthony 1916: Plate 7, Fig. 3 [1])

Devonia perrieri (from Anthony 1916: plate 7, fig. 3)

Systematics
Superordinate : Imparidentia
Order :
Superfamily : Galeommatoidea
Family : Lentil mussels (Montacutidae)
Genre : Devonia
Type : Devonia perrieri
Scientific name
Devonia perrieri
( Malard , 1904)
Soft body of Devonia perrieri . 1. View from above: P = foot, S = sipho. 2. Bottom (without housing). P = foot, rp = rear retractor muscles, ra = front retractor muscles, pb = suction cup-like depression in the foot disc. The jacket and the siphon are covered with papillae.

Devonia perrieri is a mussel species from the lentil mussel family(Montacutidae). It lives commensally on the sea ​​cucumber Leptosynapta inhaerens (OV Müller, 1776).

features

The flat, equally-hinged, constantly gaping housing is up to five millimeters long. It is obliquely rounded and rectangular in outline. The length / height ratio is around 1.4. The case is unequal, the vortices are well behind the center line, about a third of the length of the case from the rear end. It is clearly elongated towards the upper front end. The anterior dorsal margin is almost straight, it only slopes gently towards the anterior end. The front edge appears slightly truncated by a (rounded) kink from the dorsal edge to the front edge. The transition from the front edge to the ventral edge is further rounded. The posterior dorsal margin is convexly curved and slopes more sharply towards the posterior end. The rear edge is only flatly rounded. The transition from the rear edge to the ventral edge is well rounded. The ventral margin is curved in a flat convex manner.

The very narrow, short ligament lies internally in a shallow, rearward-facing depression behind the vertebrae. The lock is toothless. Occasionally there is a very small hump in front of the ligament pit. The surface line is complete. The two sphincters are essentially the same size. The anterior sphincter is elongated-elliptical, the posterior sphincter rather rounded. The jacket can enclose the housing in the edge areas, the siphon and jacket are covered on the outside with short papillae. Adult animals can no longer completely withdraw the soft body into the housing.

The whitish, often brownish tinted skin is thin and transparent. The surface is almost smooth with fine lines parallel to the edge and coarser lines that are caused by interruptions in growth. Also, there are often very fine radial lines. The inside edge of the case is smooth. The periostracum is a thin, transparent coating. Often the eddies have rust-colored deposits.

Geographical distribution, habitat and way of life

The distribution area of Devonia perrieri extends from the British Isles to the Iberian Peninsula . It is also found on the American east coast near Cape Cod .

The animals live commensally with Leptosynapta inhaerens (OF Müller, 1776) in gravelly sand. They hold on to the body of the sea cucumber with the disc-shaped foot, mainly in the rear part of the body, more rarely on the tentacles.

Taxonomy

The species name was proposed by AE Mallard in 1904 as Synapticola perrieri . Synapticola Malard, 1904 , was preoccupied by Synapticola Voight, 1892. Therefore, in 1930 Ronald Winckworth suggested Devonia as a substitute name. The genus and species are accepted as valid taxa by the MolluscaBase.

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. 94)
  • 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. 95)
  • Guido Poppe. Yoshihiro Goto: European Seashells Volume 2 (Scaphopoda, Bivalvia, Cephalopoda) . 221 pp., Verlag Christa Hemmen, Wiesbaden 1993 (2000 unc. Reprint), ISBN 3925919104 (p. 88)

On-line

Individual evidence

  1. ^ R. Anthony: Contribution à l'étude de l'Entovalva (Synapticola) Perrieri Malard, Mollusque acéphale commensal des Synaptes. Archives de Zoologie Expérimentale et Générale, 55 (6): 375-392, 1916 Online at www.archive.org (p. 325) and plate 7
  2. ^ AE Malard: Sur un Lamellibranche nouveau parasite des Synaptes. Bulletin du Muséum d'Histoire Naturelle, 1903 (7): 342-346, Paris 1904 Online at www.biodiversitylibrary.org .
  3. ^ Ronald Winckworth: Notes on Nomenclature. Proceedings of the Malacological Society of London, 19: 14-16, 1930
  4. ↑ MolluscaBase: Devonia perrieri (Malard, 1904)

Web links

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