Hydrocena

from Wikipedia, the free encyclopedia
Hydrocena
Cattaro hollow house

Cattaro hollow house

Systematics
Class : Snails (gastropoda)
Superordinate : Neritimorpha
Order : Cycloneritimorpha
Superfamily : Hydrocenoidea
Family : Hydrocenidae
Genre : Hydrocena
Scientific name
Hydrocena
Sexton , 1844

Hydrocena is a genus of land-living snails from the parentage of the Neritimorpha (subclass Orthogastropoda ). They are very small forms that often live in damp habitats near the coasts or in damp ravines. The oldest representatives of the genus are known from the Miocene ( Neogene ).

features

The representatives of the genus Hydrocena have small, rounded, egg-shaped housings with only a few, convexly curved passages. The surface is essentially smooth. The rounded, egg-shaped mouth, angled at the top, has entire margins. The edge of the mouth is simple and not thickened. The chalky cover ( operculum ) is semicircular with clear growth lines; the nucleus sits on the lower left edge. In the lower half on the inside of the lid sits a strong, conical extension. The gills have receded, breathing takes place through the tissue lining of the mantle cavity. The animals are of separate sex.

differences

The genus Georissa Blanford, 1864 differs from Hydrocena only in the spiral stripes on the case. Most species are only known through their housing. It is therefore unclear whether Hydrocena really represents a monophyletic group.

Geographical distribution and habitat

The few species of the genus live very scattered in southeast Europe, on the Canary Islands, the Azores, in East Africa and in Papua New Guinea. They are restricted to very humid habitats near the coast, to humid mountain valleys and the tropics.

Taxonomy and nomenclature

Louis Parreyss, a collector and dealer of scientific objects, collected the first animals of this species near the then Dalmatian town of Cattaro , now Kotor in Montenegro . He sent them first under the name Paludina Sirkii Parr., Later under the name Hydrocaena Sirkii Parr. Neither the species name Sirkii nor the generic name Hydrocaena were formally published by Parreyss and are therefore nomina nuda . In 1844 Heinrich Carl Küster described finds from Paludina (Hydrocena) Sirkii Parr .; Hydrocena as the name of the genus group and the species name sirkii were thus published validly for the first time by Küster. Herrmannsen (1846) lists the genus Hydrocena with Parreyss as the author. Paludina (Hydrocena) sirkii Küster, 1844 is formally the type species of the genus by monotype , but is a more recent synonym of Hydrocena cattaroensis .

Herrmannsen derives the name from the Greek ὕδωρ = water and κενός = empty, orphaned.

Some authors distinguish between two sub-genres:

  • Hydrocena (Hydrocena) sexton, 1844
  • Hydrocena (Omphalotropis) Pfeiffer, 1851

Omphalotropis has a housing that looks very similar , but is not closely related to the genus Hydrocena , but belongs to the family Assimineidae , superfamily Rissooidea in the superordinate order of the Caenogastropoda .

There are currently about six recent species and three fossil species belonging to the genus Hydrocena . However, the differences to the genus Georissa are very small.

In the literature and on websites there are other species that belong to the genus Hydrocena , but which have since been assigned to other genera, e.g. B. Hydrocena cerea Pfeiffer, 1857 (today genus Omphalotropis ), Hydrocena gowerensis Iredale, 1944 (type species of the genus Monterissa ) and Hydrocena monterosatiana Godwin-Austen & Nevill, 1879 (today genus Georissa ). The many species of the Pacific region listed under the generic name Hydrocena are now almost exclusively placed in the genera Assiminea or Georissa .

supporting documents

literature

  • Wilhelm Wenz: Gastropoda. Part I: General Part and Prosobranchia. In: Handbuch der Paläozoologie Volume 6, 948 p., Berlin, Verlag von Gebrüder Borntraeger, 1938 (p. 433)

Individual evidence

  1. ^ A b c W. Richard Schlickum: The genus Hydrocena in the European Tertiary (Neritacea, Hydrocenidae). In: Archiv für Molluskenkunde , Volume 110, Issue 1-3, 1979, pp. 71-74, ISSN 0003-9284
  2. ^ Base de Dados da Biodiversidade dos Açores: Hydrocena gutta Shuttleworth, 1852
  3. ^ Heinrich Carl Küster: Zoological notices. Toughness of the internal mollusks. In: Isis von Oken , year 1844, issue 9, 1844, pp. 645–656, Leipzig Online at www.biodiversitylibrary.org (p. 646).
  4. ↑ a b August Nicolaus Herrmannsen: Indicis generum malacozoorum primordia: nomina subgenerum, generum, familiarum, tribuum, ordinum, classium; adjectis autoribus, temporibus, locis systematicis atque literariis, etymis, synonymis. Volume 1, Kassel, Theodor Fischer, 1846. Online at www.biodiversitylibrary.com (p. 546)
  5. ^ A. Paladilhe: Étude sur les Coquilles fossiles contenues dans les marnes Pliocènes lacustres des environ de Montpellier. In: Revue des Sciences naturelles , Volume 2, 1873, pp. 38-65, Paris. Online at www.biodiversitylibrary.org
  6. ↑ RJ Shuttleworth: Diagnoses of some new [sic] molluscs from the Canary Islands. In: Mittheilungen der Naturforschenden Gesellschaft in Bern, Volume 1852, No. 241/242, 1852, pp. 137–146 Online at www.biodiversitylibrary.org .
  7. ↑ a b B. Verdcourt: New and little known species of terrestrial Mollusca from East Africa and Congo (Kinshasa). In: Annales Historico-Naturales Musei Nationalis Hungarici, Volume 2004, pp. 299-315, ISSN 0521-4726 PDF
  8. ^ WH Benson: New Land Shells collected by EL Layard, Esq. In: The Annals and Magazine of Natural History, 2nd series , Volume 18, No. 108, 1856, pp. 433-439, London Online at www.biodiversitylibrary.org
  9. ^ Mathias Neubauer, Thomas A. Neubauer: Opole (Poland) - a ley locality for middle Miocene terrestrial mollusc faunas. Bulletin of Geosciences 93 (1): 71-146, 2018 doi : 10.3140 / bull.geosci.1692
  10. ^ Andrzej Wiktor: Terrestrial gastropods of the Province of Madang in Papua New Guinea: I. Terrestrial prosobranchia. In: Archiv für Molluskenkunde , Volume 127, No. 1/2, 1998, pp. 1–20, Frankfurt / M. ISSN 0003-9284
  11. ↑ Worldwide Mollusca Species Database - Hydrocena

Web link

Commons : Hydrocena  - collection of images, videos and audio files