Eudendriidae

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Eudendriidae
Flabellina affinis (Gmelin, 1791) (Gastropoda, Aeolidoidea) on their diet Eudendrium racemosus

Flabellina affinis (Gmelin, 1791) (Gastropoda, Aeolidoidea) on their diet Eudendrium racemosus

Systematics
Trunk : Cnidarians (Cnidaria)
Class : Hydrozoa (Hydrozoa)
Subclass : Leptolinae
Order : Anthomedusae
Subordination : Filifera
Family : Eudendriidae
Scientific name
Eudendriidae
Agassiz , 1862

The Eudendriidae are an exclusive marine, worldwide occurring family of the Hydrozoa (Hydrozoa). The family currently includes around 85 species.

features

The hydroid polyps form colonies that are connected by stolons, sometimes also upright sticks with a branched trunk that extend from a hydrorhiza . The single polyps usually have a stalk. The trunk, twigs and stems, sometimes even the lower parts of the hydrant , are covered by perisarc . The hydrants are relatively large, urn-shaped with an offset, trumpet-shaped mouth cone (hypostome). Directly below the cone of the mouth sit one or more wreaths of filiform, solid tentacles. The polyp body sometimes has a basal, tentacle-like extension. Near the base, the polyp has a ring with nettle cells just above the peridermal pit. Sexual reproduction takes place via spore sacs that sit on the hydrant directly above the tentacles. The gender polyp is often reduced to a blastostyle, ie it no longer has a mouth. The male gonophores are usually arranged linearly in several chambers. The female gonophores originally have a curved piston (spadix), each piston contains a single egg. The desmonemes are absent in the cnidome and only eurytele nettle cells are present.

Geographical occurrence

The representatives of the family are spread around the world. While the genus Myrionema is limited to warmer seas, comes Eudendrium before including sub-Antarctic and polar seas in cooler regions.

Systematics

The family currently consists of only two genera:

swell

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. In: Zootaxa 1668, 2007, ISSN  1175-5326 , pp. 127-182, abstract (PDF; 406 kB) .
  • AC Marques, H. Mergner, R. Höinghaus, CMD Santos and Willem Vervoort: Morphological study and taxonomical notes on Eudendriidae (Cnidaria: Hydrozoa: Athecatae / Anthomedusae). Zool. Med. Leiden, 74 (5): 75-118, Leiden 2000 ISSN  0024-0672 .

On-line

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