Tellimya tenella
| Tellimya tenella | ||||||||||||
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| Scientific name | ||||||||||||
| Tellimya tenella | ||||||||||||
| ( Lovén , 1847) |
Tellimya tenella is a type of mussel from the lentil mussel family(Montacutidae). It lives commensally with the spatangid sea urchin Brissopsis lyrifera .
features
The flat, moderately expanded case is obliquely rounded and rectangular in shape. It becomes up to six millimeters long. The length / height ratio is around 1.5. The casings are unequal, the vortices are well behind the center line, about a third of the casing length from the rear end. It is clearly elongated towards the middle part of the front end. The anterior dorsal margin is convexly curved, does not fall off and goes without a kink into the anterior margin, and this into the ventral margin. The posterior dorsal margin is convexly curved, but drops sharply towards the rounded posterior end. The ventral margin is curved in a wide convex manner.
Most of the ligament lies internally in a shallow depression behind the vertebrae. The angle between the posterior dorsal margin and the ligament pit is at least 90 °. In the left valve there is a very small lamellar lateral tooth in front of the vertebrae. There is a corresponding pit in the right flap. The surface line is complete.
The whitish skin is thin. The surface is almost smooth with fine lines parallel to the edge and coarser lines that are caused by interruptions in growth. In addition, very fine radial lines are often present. The inside edge of the case is smooth. The periostracum is a thin, shiny coating. Often the pegs have a rust-colored coating.
Geographical distribution and habitat
The range of the species extends from northern Norway to the Mediterranean . It has also been detected from the Dutch North Sea coast.
Tellimya tenella (Loven, 1846) lives commensally with the sea urchin Brissopsis lyrifera (Forbes, 1841). The animals are protandric hermaphrodites . They are males from a size of 1.8 to 2.4 mm. The gender begins to change from just 2.3 mm in length. After that they are only females. Reproduction only takes place in summer. The yolk-rich eggs are retained in the mantle cavity and develop into Veliger larvae. They are released from the mantle cavity with a housing length of 240 µm. The Veliger larvae remain in the plankton up to a size of 450 µm.
Taxonomy
The taxon was established by Sven Lovén in 1847 as Montacuta tenella . According to MolluscaBase, it is now part of the genus Tellimya Brown, 1927. The species is quasi the type species of the genus Decipula Friele, 1875, since the formal type species Decipula ovata Friele, 1875 is a more recent synonym of Montacuta tenella Lovén, 1846.
supporting documents
literature
- Thomas H. Fox, Åse Jespersen, Jørgen Lützen: Sperm Transfer and Reproductive Biology in Species of Hermaphroditic Bivalves (Galeommatoidea: Montacutidae). Journal of Morphology, 268: 936-972, 2007 doi : 10.1002 / jmor.10538
- Kurt W. Ockelmann: Redescription, distribution, biology, and dimorphous sperm of Montacuta tenella Lovén (Mollusca, leptonacea). Ophelia, 2 (1): 1965 doi : 10.1080 / 00785326.1965.10409600
On-line
Individual evidence
- ↑ R. Daan, MSS Lavaleye, M. Mulder: Three marine mollusc species new to the Dutch recent fauna. Basteria, 67: 149-152, 2004 PDF
- ^ Sven Lovén: Nordens Hafs-Mollusker. Öfversigt af Kongl. Vetenskaps-akademiens förhandlingar, 3 (for 1846): 182–204, Stockholm 1847 Online at www.biodiversitylibrary.org (p. 197)
- ^ Sven Lovén: Bidrag till kännedomen om utvecklingen af Mollusca Acephala Lamellibranchiata. Kongliga Vetenskaps-Akademiens Handlingar, ser. 3, 36 (for 1848): 329–436, Stockholm, 1849 plate 13
- ↑ [1]
- ^ Raymond Cecil Moore (Ed.): Treatise on invertebrate paleontology. Mollusca, 6, Part N, Bivalvia 2. XXXVIII S., S.N491-951, New York, 1969 (S.N530).