Large beaked clam

Large beaked clam
	Large beaked mussel ( Nuculana pernula ) (from Wood 1848: Plate 10, Fig. 13)
Systematics
Order :	Nuculanida
Superfamily :	Nuculanoidea
Family :	Beak clams (Nuculanidae)
Subfamily :	Nuculaninae
Genre :	Nuculana
Type :	Large beaked clam
Scientific name
	Nuculana pernula
	( OV Müller , 1779)

The great beaked mussel ( Nuculana pernula ) is a mussel species from the family of the Nuculanidae (order Nuculanida ) in the subclass Protobranchia .

features

The same-flap, moderately flared, elongated egg-shaped housing is narrow at the back; the rear end is trimmed and rounded slightly convex. The vertebra sits well in front of the middle, i.e. H. the rear housing part is about twice as long as the front part of the housing. The housing becomes about 28 mm long. The ventral margin is widely curved, the dorsal margin angled. The front part of the dorsal margin is slightly curved upwards, the rear dorsal margin is straight to slightly concave. It has short overgrown siphons; but the surface line is only slightly indented.

The elliptical area shows only indistinct edges and is only slightly raised. The lunula is long, lanceolate, clearly raised with moderately sharp edges. A distinct keel extends from the vertebra to the rear end or rostrum.

The lock is taxodontic and comparatively strong. The edge of the lock is only slightly curved or slightly angled, the angle or arch is located under the vertebra and the ligament. The lock plate is slightly bent outwards (upwards) in front of the action . It is narrow under the vertebra and increases in width towards the front end. Behind the action, the lock plate is slightly concave (inward). The ligament lies inside, opisthodically with a rounded triangular ligament on a resilifer (ligament carrier). In the front part of the lock there are 16 small teeth angled towards the center of the lock, in the rear part of the lock there are 19 small teeth, which are also angled towards the center of the lock.

The surface is regularly finely ribbed concentrically with coarser, irregular growth interruptions. The edge of the case is smooth. The periostracum is pale olive green to dark olive brown. and flakes easily. The surface is slightly shiny. The whitish skin is thin and brittle.

Similar Art

The slightly smaller on average Little bill mussel ( Nucula minuta ) is not quite as slim as the Great beak clam ( Nuculana pernula ). The first type is also more coarsely ribbed.

Geographical distribution and habitat

The great beaked mussel is found on both sides of the North Atlantic. In the east the distribution area extends from the Arctic to the Biscay, in the west from Greenland to the east coast of the USA. It is also found in the North Sea and even penetrates the western Baltic Sea.

It lives on silt soils from around 9 meters to a depth of 900 meters.

Taxonomy

The taxon was introduced into scientific literature in 1779 by Otto Friedrich Müller as Arca pernula . The taxon was previously placed in the genus Leda Schumacher, 1817, a more recent synonym by Nuculana Link, 1807.

supporting documents

literature

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. 8)
Rainer Willmann: Mussels and snails of the North and Baltic Seas. 310 p., Neumann-Neudamm, Melsungen 1989, ISBN 3-7888-0555-2 (p. 84)
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. 39)

On-line

Marine Bivalve Shells of the British Isles: Nuculana pernula (Müller, 1779) (website of the National Museum Wales, Department of Natural Sciences, Cardiff)

Individual evidence

^ Searles Valentine Wood: A monograph of the Crag Mollusca, or, description of shells from the Middle and Upper Tertiaries of the east of England, 2. Bivalves. 541 p., Palaeontographical Society, London 1848 plate 10, Fig. 13 (online at www.biodiversitylibrary.org)

↑ Otto Friedrich Müller: Of two little known mussels, the ham arche and the wrinkled Mahler mussel. Activities of the Berlin Society of Friends of Nature Research, 4: 55-59, Berlin 1779 Online at www.biodiversitylibrary.org (p. 57).

↑ World Register of Marine Species: Nuculana pernula ( OV Müller, 1779)

[Wood1848-1] Searles Valentine Wood: A monograph of the Crag Mollusca, or, description of shells from the Middle and Upper Tertiaries of the east of England, 2. Bivalves. 541 p., Palaeontographical Society, London 1848 plate 10, Fig. 13 (online at www.biodiversitylibrary.org)

[Müller1779b-2] Otto Friedrich Müller: Of two little known mussels, the ham arche and the wrinkled Mahler mussel. Activities of the Berlin Society of Friends of Nature Research, 4: 55-59, Berlin 1779 Online at www.biodiversitylibrary.org (p. 57).