Amathinidae
Amathinidae | ||||||||||||
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Housing of Amathina tricarinata |
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Systematics | ||||||||||||
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Scientific name | ||||||||||||
Amathinidae | ||||||||||||
Ponder , 1987 |
The Amathinidae are a family mostly very small to small, exclusively marine snails within the Heterobranchia . They live as ectoparasites on mussels.
features
The shells of the Amathinidae resemble those of limpets or periwinkles and usually have a well-developed periostracum . There is a clear spiral sculpture, while axially at best weak lamellae are formed. The protoconch is left-handed in some species, while the rest of the case is right-handed. An operculum is only present in some species.
The foot of the Amathinidae is divided into a thin, movable mesopodium and a disc-shaped metapodium, slightly notched at the center line. The eyes sit between the two rabbit-shaped antennae. In contrast to the related Pyramidellidae , the Amathinidae do not have a hypobranchial gland , but there is a large mantle gland in the mantle cavity to the right of the folded gill.
The snails have a very long and thin proboscis that can be used to pierce host animals. The jaws and radula are missing, as are stilettos on the trunk. Instead of pines, there is a chitinous valve-like structure.
The animals are hermaphrodites that produce sperm and egg cells at the same time. The pointed penis can be withdrawn into a tube under the nerve ring.
As far as is known, the animals live as ectoparasites on mussels .
Systematics
According to Bouchet and Rocroi (2005) the family Amathinidae forms with the family Pyramidellidae JE Gray, in 1840 the superfamily Pyramidelloidea . The Amathinidae family has about 30 species in 6 genera.
The genera in the Amathinidae family are:
- Amathina Gray, 1842
- Clathrella Recluz, 1864
- Cyclothyca Stearns, 1891
- Iselica Dall, 1918
- Leucotina A. Adams, 1860
- Plicifer H. Adams, 1868
The two genera Adelactaeon Cossmann, 1895 and Myonia A. Adams, 1860 are synonyms of Leucotina A. Adams, 1860.
literature
- WF Ponder : The anatomy and relationships of the pyramidellacean limpet Amathina tricarinata (Mollusca: Gastropoda). In: Asian Marine Biology. 4, 1987, Hong Kong University Press, ISBN 978-962-209-198-6 , pp. 1-34. Appendix 1, Taxonomy of the Amathinidae , p. 29.
- A. Kästner : Textbook of special zoology. Volume I, part 3, 5th edition, Gustav Fischer, 1993, ISBN 978-3-334-60412-0 .
Web links
Individual evidence
- ^ World Register of Marine Species , Amathinidae Ponder, 1987
- ^ World Register of Marine Species , Amathina Gray, 1842
- ^ World Register of Marine Species , Clathrella Recluz, 1864
- ^ World Register of Marine Species , Cyclothyca Stearns, 1891
- ^ World Register of Marine Species , Iselica Dall, 1918
- ^ World Register of Marine Species , Leucotina A. Adams, 1860
- ^ World Register of Marine Species , Plicifer H. Adams, 1868