Myrtea spinifera

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Myrtea spinifera
Myrtea spinifera (original picture from Montagu 1803: Plate 17, Fig. 1 [1])

Myrtea spinifera (original picture from Montagu 1803: plate 17, fig. 1)

Systematics
Order : Lucinida
Superfamily : Lucinoidea
Family : Moon mussels (Lucinidae)
Subfamily : Myrteinae
Genre : Myrtea
Type : Myrtea spinifera
Scientific name
Myrtea spinifera
Montagu , 1803

Myrtéa spinifera is a mussel from the family of lucinidae (Lucinidae). It occurs in the North Atlantic.

features

The equally-folded, moderately inflated housing is egg-shaped with rounded kinks at the front and rear ends. It becomes up to 26 mm long. A smaller specimen measured: 20 mm long, 17 mm high and 8 mm thick in cross-section (both flaps). This results in a length-height ratio of just under 1.2. The casing is unequal, the small, pointed vertebrae are curled up at an angle and shifted slightly towards the front end (about 40% of the total length of the casing from the front end). The posterior dorsal margin is almost straight to slightly convex. The rear edge is truncated almost vertically and straight. The anterior dorsal margin starts deeper and is straight to slightly concave. The front edge is also somewhat trimmed, sits a little higher than the rear edge and slopes forward at an angle. The ventral margin is very well rounded.

There is a short, deep, egg-shaped lunula . The area (label) is long and deep. The lunula and area are delimited by nodular or tooth-like extensions of the sculpture. The ligament is a light brown band that takes up about half the length of the posterior dorsal margin. There is one cardinal tooth in the right flap and two cardinal teeth in the left flap. In addition, an anterior and a posterior lateral tooth is developed in both valves. A crest can be developed along the dorsal margin, which appears as an additional lateral tooth. The surface line is complete, not indented. The anterior sphincter is larger, longer, and narrower than the posterior sphincter.

The moderately thick and firm shell is white or cream-colored. The sculpture consists of approx. 40 concentric lamellae, which are covered with nodules towards the front and rear. Fine strips of growth can be seen in the intermediate areas. The inside edge of the housing is smooth. The periostracum is a thin, cream-colored, organic layer. The inside of the bowl is also whitish, but can still have a light pink tint.

Geographical distribution and habitat

The distribution area extends from Norway to the Mediterranean . It is also found in the waters around the Canary Islands , Madeira , the Cape Verde Islands, and the Azores .

Myrtea spinifera lives in muddy and muddy-sandy, also muddy-gravelly sediments from below the low water line to about 250 m water depth. It is seldom deeper, max. to be found up to a depth of 900 m.

Taxonomy

The taxon was introduced by George Montagu in 1803 as Venus spinifera . It is widely recognized today; it is the type species of the genus Myrtea Turton, 1822.

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. 83)
  • 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)

On-line

Individual evidence

  1. ↑ a b George Montagu: Testacea Britannica, or natural history of British shells, marine, land, and fresh-water, including the most minute: systematically arranged and embellished with figures. White, London 1803 Online at www.biodiversitylibrary.org (p. 577/8).
  2. ↑ MolluscaBase: Myrtea spinifera (Montagu, 1803)

Web links

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