Corynidae

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Corynidae
Scrippsia pacifica

Scrippsia pacifica

Systematics
Trunk : Cnidarians (Cnidaria)
Class : Hydrozoa (Hydrozoa)
Subclass : Hydroidolina
Order : Anthoathecata
Subordination : Capitata
Family : Corynidae
Scientific name
Corynidae
Johnston , 1836

The Corynidae are a family of hydrozoa (Hydrozoa) from the tribe of the cnidarians (Cnidaria) that live exclusively in the sea . It is a larger family with around 60 species in eleven genera .

features

The hydroid polyps form monomorphic colonies that rise from a crust or creeping stolons; they can be branched or unbranched. The hydrant have a wreath capitate tentacles around the mouth, as well as further capitate tentacles, which can be distributed irregularly or arranged in further wreaths. Occasionally filiform tentacles, which have a sensory function, also appear below the capitate tentacles. The gonophores can be sessile spore sacs, sessile eumedusoids or free medusa. Occasionally the gonophores are even completely reduced and the sex products develop are in the wall of the hydrant. As far as is known, the cnidome consists of stenotles with or without isorhizas or mastigophores.

The medusa has a bell-shaped umbrella with or without an apical chamber. There are no rows of stinging cells. The manubrium is tubular or cylindrical, the mouth simple and rounded. There are four radial channels and one ring channel. The medusa has four tentacle buds with gastrodermal chambers and two to four hollow, roughly equal marginal tentacles. The cnidoma largely corresponds to the cnidoma of the polyps, but there are also desmonemes. The gonads completely enclose the outer wall of the manubrium, they can be arranged in one or two rings. Most are located abaxial Ocelli present on the tentacle buds.

Geographical occurrence and way of life

The family occurs in all seas worldwide. They prefer to live in shallower waters.

Systematics

In a new work by Nawrocki et al. (2010) the family Corynidae is phylogenetically examined and restructured. As a result, compared to Bouillon et al. (2006) some deviations in the systematic extent of the family. The families Polyorchididae and Codonidae are regarded as synonyms of Corynidae, the genera and species of these families are transferred to the Corynidae. In this work, Stauridiosarsia Mayer, 1910, is again considered as an independent genus and some species that were previously placed under the genera Coryne and Sarsia are transferred to this genus. The following overview follows the World Hydrozoa Database.

Phylogeny

The internal phylogeny of the Corynidae was recently published by Nawrocki et al. (2010) examined. The Cladonematidae turned out to be the sister group of the Corynidae. However, the genera Bicorona , Cladosarsia , Nannocoryne and Dicyclocoryne could not be included in the study . Without these genera, the family tree looks like this:

    unnamed  


 Cladonematidae


  Corynidae  




 Dipurena


   

 Sarsia



   

 Polyorchis


   

 Scrippsia



   

 Coryne


   

 Codonium


Template: Klade / Maintenance / 3Template: Klade / Maintenance / 4

   

 Stauridiosarsia






Template: Klade / Maintenance / Style

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literature

  • Jean Bouillon, Cinzia Gravili, Francesc Pagès, Josep-Maria Gili and Fernando Boero: An introduction to Hydrozoa. Mémoires du Muséum national d 'Histoire naturelle, 194: 1-591, Publications Scientifiques du Muséum, Paris 2006 ISBN 978-2-85653-580-6
  • 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

On-line

Individual evidence

  1. ↑ Annalize M. Nawrocki, Peter Schuchert and Paulyn Cartwright: Phylogenetics and evolution of Capitata (Cnidaria: Hydrozoa), and the systematics of Corynidae. Zoologica Scripta, 39: 290-304, 2010 doi : 10.1111 / j.1463-6409.2009.00419.x
  2. ^ World Hydrozoa Database

Web links

Commons : Corynidae  - Collection of images, videos and audio files