Hydrocenidae

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Hydrocenidae
Cattaro hollow houses (Hydrocena cattaroensis)

Cattaro hollow houses ( Hydrocena cattaroensis )

Systematics
Class : Snails (gastropoda)
Subclass : Orthogastropoda
Superordinate : Neritimorpha
Order : Cycloneritimorpha
Superfamily : Hydrocenoidea
Family : Hydrocenidae
Scientific name of the  superfamily
Hydrocenoidea
Troschel , 1857
Scientific name of the  family
Hydrocenidae
Troschel , 1857

The Hydrocenidae are a family of snails from the parentage of the Neritimorpha (subclass Orthogastropoda ). It is the nominotypical and only family of the superfamily Hydrocenoidea . They are very small forms that often live in wet habitats near the coast, in wet gorges or in caves. The family is probably already present in the Upper Cretaceous.

features

The family is characterized by small, rounded, egg-shaped housings that have only a few, convexly curved whorls. A spiral sculpture can be present or absent. The mouth is entire, rounded-egg-shaped and angled at the top. The edge of the mouth is strong, but not thickened, and the outer edge is not turned over. The spindle is short and slightly concave. The rim of the spindle is somewhat thickened and turned over the navel; there is therefore no navel gap. There is a chalky cap that is worn on the back of the foot. It is semicircular with strong growth lines and a nucleus on the lower left edge. On the inside of the lid there is a strong, conical appendage (apophysis). The gills have receded, breathing takes place through the tissue lining of the mantle cavity. The animals are of separate sex.

Geographical distribution and habitat

The representatives of the family are land animals that live in humid biotopes near the coast. Some species live further away from the coast and at higher altitudes in the mountains. Some species have become typical cave dwellers.

Taxonomy and systematics

The taxon was set up in 1856 by Franz Hermann Troschel. It currently includes about seven genera:

The genus Georissops , which is still listed by Wenz, is used today e.g. T. as a subgenus of Georissa , z. T. regarded as a synonym of Georissa .

Phylogeny

According to the phylogenetic analysis of the architaenioglossa by Kano et al. (2002) Hydrocenidae, Helicinidae , Neritiliidae , Phenacolepadidae and Neritidae form a clade that is the sister group of the Neritopsidae . Within the clade Helicinidae, Neritiliidae, Phenacolepadidae and Neritidae, the Hydrocenidae family is basically opposite to the other groups. Of these four groups, Phenacolepadidae and Neritidae on the one hand and Helicinidae and Neritiliidae on the other hand are sister groups. The authors also transferred Schwardtina cretacea (Tausch, 1856) from the Upper Santonium / Lower Campanium (Upper Cretaceous) of Hungary to the Hydrocenidae family. Bandel & Riedel (1994) originally placed the genus in the Neritidae family with question marks. However, the protoconch of Schwardtina cretacea is very similar to the protoconch of the genus Hydrocena . The Hydrocena protoconch is typical of non-planktotrophic development; H. the embryo fed on eggs or albumin reserves in the egg capsule. That is why the teleoconch immediately follows the embryonic casing and not a larval casing. According to the revised interpretation by Schwardtina , the fossil record of the Hydrocenidae family begins as early as the Upper Cretaceous. The eponymous genus Hydrocena is known from the Tortonian ( Miocene , Neogen ).

supporting documents

literature

  • Philippe Bouchet, Jean-Pierre Rocroi: Part 2. Working classification of the Gastropoda. In: Malacologia. 47, Ann Arbor 2005, pp. 239-283, ISSN  0076-2997
  • Henry Suter: Manual of the New Zealand Mollusca. Wellington 1913, p. 175.
  • Wilhelm Wenz: Gastropoda. Part I: General Part and Prosobranchia. In: Handbuch der Paläozoologie. Volume 6, Verlag von Gebrüder Borntraeger, Berlin 1938, p. 433.

Individual evidence

  1. ↑ a b Yasunori Kano, Satoshi Chiba, Tomoki Kase: Major adaptive radiation in neritopsine gastropods estimated from 28S rRNA sequences and fossil records. In: Proceedings of the Royal Society London B. Volume 269, London 2002, pp. 2457-2465, doi: 10.1098 / rspb.2002.2178
  2. ↑ Franz Hermann Troschel: The teeth of snails to justify a natural classification. Volume 1, Nicolaische Verlagsbuchhandlung, Berlin 1857, p. 83 Online at www.biodiversitylibrary.org
  3. ^ William T. Blanford: On the Animal and Operculum of Georissa, W. Blanf., And on its relations to Hydrocena Parreyss; with a note on Hydrocena tersa, Bens., and H. milium, Bens. In: The Annals and Magazine of Natural History. 4th series, Vol. 3, pp. 173-179. Online at www.biodiversitylibrary.org
  4. ^ A b Klaus Bandel, Frank Riedel: The Late Cretaceous gastropod fauna from Ajka (Bakony Mountains, Hungary): a revision. In: Annals of the Natural History Museum in Vienna. Volume 94A, Vienna 1994, pp. 1-65. (PDF)  ( Page no longer available , search in web archives )  Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.@1@ 2Template: Toter Link / www.geo.fu-berlin.de  
  5. ↑ R. Egorov: Sinicena, a new replacement name for Lapidaria Kang, 1986 (non Tjernvik, 1956) (Gastropoda: Neritopsiformes: hydrocenidae). In: Club Conchylia information. Volume 35, No. 1-6, 2003, p. 75.
  6. ↑ ZB Kang: Descriptions of eight new minute freshwater snails and a new and rare species of land snail from China (Prosobranchia: Pomatiopsidae, Hydrobiidae; Hydrocenidae). In: Archives for Molluscology. Volume 117, No. 1-3, 1986, pp. 73-91.
  7. ^ W. Richard Schlickum: The genus Hydrocena in the European Tertiary (Neritacea, Hydrocenidae). In: Archives for Molluscology. Volume 110, Issues 1-3, 1979, pp. 71-74. ISSN  0003-9284

Web links

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