Pyramidellidae
Pyramid Ella acus
The Pyramidellidae are a species-rich family usually very small to small, exclusively marine snails within the Heterobranchia that are distributed worldwide. They live as ectoparasites on a variety of host animals. More than 6,000 species and 350 genera are described.
Features
The Pyramidellidae have high conical housing in which the whole body of the screw can be withdrawn. The protoconch is linksgewunden rechtsgewunden and the rest of the body. The case mouth, varies its shape depending on the type, can be closed with a operculum.
A fold of the foot, the slightly notched at the center line mentum, projecting forward from between the head and Propodium. The probe, between which the eyes are located, have a concave surface.
The snails have an eversible proboscis with stiletto pines, are drilled by means of which host animals. A radula is absent.
The animals are hermaphrodites, which simultaneously produce sperm and egg cells. They copulate each other with their penises. The fertilized eggs are deposited in gelatinous Located within which feed on the veliger larvae of yolk or leave after a few days as free-swimming larvae, the capsule in order to live up to metamorphosis, often only a few days as plankton.
The Pyramidellidae are usually very small with a body length of a few millimeters, only in exceptional cases up to 5 centimeters.
The animals live as ectoparasites on various host animals, especially polychaetes and molluscs, but also spray worms, crabs, sponges and sea squirts. Only a few species of Pyramidellidae are host specific. Most species are not picky in choosing the host.
System
After Bouchet and Rocroi (2005 ) the family Pyramidellidae forms with the family Amathinidae Ponder, 1987, the superfamily Pyramidelloidea. The Pyramidellidae family has over 6000 species in about 350 genera.
- Family Pyramidellidae Subfamily Chrysallidinae genus Babella
- Genus Boonea
- Genus Chrysallida
- Genus Egilina
- Genus Parthenina
- Genus Spiralinella
- Genus Cingulina
- Genus Cyclostremella
- Genus Eulimella
- Genus Odostomella
- Genus Heviera
- Genus Brachystomia
- Genus Jordaniella
- Genus Linopyrga
- Genus Liostomia
- Genus Megastomia
- Genus Noemiamea
- Genus Odostomia
- Genus Ondina
- Genus Longchaeus
- Genus Milda ( snail)
- Genus Otopleura
- Genus Pyramid Ella
- Genus Sayella
- Genus Syrnola
- Genus Tiberias
- Genus Bartsch Ella ( snail)
- Genus Careliopsis
- Genus Chemnitzia
- Genus Cylindriturbonilla
- Genus Dunkeria
- Genus Pyrgiscus
- Genus Ptycheulimella
- Genus Turbonilla