Heterotentacula mirabilis

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Heterotentacula mirabilis
Systematics
Subclass : Leptolinae
Order : Anthomedusae
Subordination : Filifera
Family : Heterotentaculidae
Genre : Heterotentacula
Type : Heterotentacula mirabilis
Scientific name of the  family
Heterotentaculidae
Schuchert , 2010
Scientific name of the  genus
Heterotentacula
Schuchert, 2010
Scientific name of the  species
Heterotentacula mirabilis
( Kramp , 1957)

Heterotentacula mirabilis is a species of the Hydrozoa (Hydrozoa). It is the only species in the genus Heterotentacula , which in turn is the only genus in the Heterotentaculidae family . It is a replacement name for the preoccupied and therefore invalid name Russellia Kramp, 1957. According to the International Rules for Zoological Nomenclature , the family name Russelliidae Kramp, based on this genus, became invalid in 1957 and was replaced by Heterotentaculidae Schuchert, 2010.

features

The hydroid polyps are unknown. The umbrella of the medusa has an apical extension. The manubrium sits on a gastral stalk. The mouth is simple, the lips are barely pronounced. There are four unbranched, filiform tentacles that start above the edge of the mouth. The marginal tentacles are arranged in eight groups, four perradial and four interradial, each group with a large tentacle flanked by two small tentacles. The large tentacles are hollow and without basal thickenings. The basal part is fused with the umbrella and sunk deep into furrows on the edge of the umbrella. On each tentacle there is an ocellus near the base . The gonads sit in eight groups on the outside of the manubrium.

Geographical occurrence

Until recently, the genus was only known from Antarctica and the West Indies. In 1999 a group of authors led by Francesc Pagès published a find from the Alborán Sea (western Mediterranean ). The authors discuss a spread of the species from the Antarctic waters into the Mediterranean, for example with ballast water or through polyps attached to the ship's hull, which only formed the medusa stage in the Mediterranean. A natural occurrence is also not excluded. The species lives at a depth of up to 300 m.

Systematics

According to the "World Hydrozoa Database", the family contains only one genus, which in turn contains only one species:

  • Heterotentaculidae Schuchert, 2010
    • Heterotentacula Schuchert, 2010
      • Heterotentacula mirabilis (Kramp, 1957)

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literature

  • Marymegan Daly, Mercer R. Brugler, Paulyn Cartwright, Allen G. Collin, Michael N. Dawson, Daphne G. Fautin, Scott C. France, Catherine S. McFadden, Dennis M. Opresko, Estefania Rodriguez, Sandra L. Romano & Joel L. Stake: The phylum Cnidaria: A review of phylogenetic patterns and diversity 300 years after Linnaeus. Zootaxa, 1668: 127-182, Wellington 2007 ISSN  1175-5326 Abstract - PDF
  • Peter Schuchert: The European athecate hydroids and their medusae (Hydrozoa, Cnidaria): Capitata Part 2. Revue Suisse de Zoologie 117: 337–555, 2010.

On-line

Individual evidence

  1. ↑ Francesc Pagès, Phil R. Pugh and Volker Siegel: The discovery of an Antarctic epipelagic medusan in the Mediterranean. Journal of Plankton Research, 21 (12): 2431-2435, Oxford 1999 text
  2. ↑ World Hydrozoa Database - Heterotentacula Schuchert, 2010

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