Carinariidae

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Carinariidae
Carinaria lamarcki. A Guide to the shell and starfish galleries of the British Museum, London 1901, p. 22.

Carinaria lamarcki . A Guide to the shell and starfish galleries of the British Museum , London 1901, p. 22.

Systematics
Subclass : Orthogastropoda
Superordinate : Caenogastropoda
Order : Sorbeoconcha
Subordination : Hypsogastropoda
Superfamily : Pterotracheoidea
Family : Carinariidae
Scientific name
Carinariidae
Blainville , 1829
Wet preparation of Carinaria lamarcki , National Museum of Natural History

The Carinariidae are a family of the Pterotracheoidea (formerly also called Heteropoda) within the snail . They have a pelagic way of life and are predatory of other planktonic and nectonic organisms.

features

The family includes very large forms (up to approx. 50 cm) with a transparent and cap-shaped mineralized housing. In Carinaria and Pterosoma , the casing only covers the intestines, gonads, heart and gills. In the Cardiapoda genus , the housing is microscopic and sits dorsally in the visceral nucleus . In contrast to the representatives of the Atlantidae, they can no longer withdraw into the housing. An operculum is not present in the adult animals. The body is elongated and translucent. It is clearly divided into a snout area, the actual body and the tail region. The animals swim on their backs with the help of the foot that has been transformed into a fin. There is a fin suction cup on the foot, but it is relatively small in relation to the overall size of the fin. The eyes are highly developed and have a lens. The long radula has 7 elements per transverse row; a central tooth as well as a lateral tooth and two marginal teeth on either side of the central tooth. The animals are of separate sex. The males transfer the sperm packages with the mating organ into the mantle cavity. The development takes place via a planktotrophic (plankton-eating) Veliger larva. During the larval phase, the animals still have an operculum for closing the (larval) housing, which is then thrown off during metamorphosis.

Lifestyle and diet

The representatives of the family live exclusively pelagic in the open sea. They prefer to feed on salps (Thaliacea), Doliolida and arrow worms (Chaetognatha). The prey is swallowed whole.

Occurrence

The species in the family live in the upper 200 meters of warmer seas worldwide.

Systematics

There are currently three types of family:

literature

  • Philippe Bouchet & Jean-Pierre Rocroi: Part 2. Working classification of the Gastropoda . Malacologia, 47: 239-283, Ann Arbor 2005 ISSN  0076-2997
  • Victor Millard: Classification of the Mollusca. A Classification of World Wide Mollusca . Rhine Road, South Africa 1997 ISBN 0-620-21261-6
  • Winston Ponder & David Lindberg: Towards a phylogeny of gastropod molluscs; an analysis using morphological characters . Zoological Journal of the Linnean Society, 119: 83-265, London 1997 ISSN  0024-4082
  • G. Richter and Roger R. Seapy: Heteropoda. In: Demetrio Boltovskoy (ed.), South Atlantic Zooplankton. Pp. 621-647, Leiden, Backhuys Publ. 1999 ISBN 90-5782-035-8

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