Eulima bilineata
| Eulima bilineata | ||||||||||||
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Eulima bilineata . From Illustrated Index of British Shells, Plate XV., Fig. 25. 1859 |
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| Scientific name | ||||||||||||
| Eulima bilineata | ||||||||||||
| Alder , 1848 |
Eulima bilineata is the name of a worm - type from the family of eulimidae (genus Eulima ), as Ectoparasite of brittle stars live.
features
Eulima bilineata has a narrow, highly conical snail shell with a slightly convex outline, which in adult snails reaches a shell length of around 6 mm and a width of around 2 mm. The thread has up to 13 flat-sided whorls with an inconspicuous real seam and a parallel false seam, which is often more noticeable in living snails. The smooth surface of the housing has very fine growth strips that are visible in the reflected light. The narrow, teardrop-shaped case mouth has an outer lip that rises tangentially to the perimeter of the body between two spiral brown bands. Apart from these two peripheral bands, the case is colorless.
The snail itself is white and looks like Eulima glabra : The head is a thin protrusion, on the underside of which there is an opening of a trunk that can be folded in and out and two long, tapering antennae with eyes behind. On the right edge of the jacket there is a jacket sensor. In young, male animals, behind the right antennae, there is a long penis with a dorsal open sperm groove. Older, larger animals undergo sex reassignment surgery to a female. A penis stump remains on this. The large foot of the snail is narrow, but broad in front and has conspicuous opercular lobes behind.
Distribution and way of life
Eulima bilineata is distributed in the north-eastern Atlantic Ocean from the Mediterranean to northern Norway . It lives on soft subsoil at sea depths of 20 to 250 m, occasionally up to the lower edge of the intertidal zone.
Eulima bilineata sucks, among others, the brittle stars Ophiothrix fragilis , Ophiactis ballistic and Ophiopholis aculeata , but it only searches for eating and crawling incidentally around freely.
literature
- Anders Warén (1983): A Generic Revision of the Family Eulimidae (Gastropoda, Prosobranchia). Journal of Molluscan Studies 49 (Supplement 13), pp. 1-96, here pp. 76-80. doi: 10.1093 / mollus / 49.Supplement_13.1
Web links
- MJ de Kluijver, SS Ingalsuo, RH de Bruyne: Eulima bilineata Alder, 1848. Marine Species Identification Portal
Individual evidence
- ↑ Ivan O. Nekhaev (2011): Two species of parasitic molluscs new for Russian seas (PDF; 1.0 MB) . Ruthenica 21 (1), pp. 69-72.