Poecilochaetus
| Poecilochaetus | ||||||||||||
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| Systematics | ||||||||||||
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| Poecilochaetidae | ||||||||||||
| Hannerz , 1956 | ||||||||||||
| Scientific name of the genus | ||||||||||||
| Poecilochaetus | ||||||||||||
| Claparède in Ehlers , 1875 |
In the genus Poecilochaetus that simultaneously the mono generic family Poecilochaetidae forms, is polychaete (Polychaeta), which are found in oceans worldwide as detritus from the coastal strip to the deep sea.
features
The many- bristles of the genus Poecilochaetus have a pair of palps with eyelashes, bristles protruding forwards that form a “head cage”, and bottle-shaped lobes on the two- branched parapodia that sit behind the bristles . The prostomium is cut off in front and carries a single central antenna ventrally on which papillae sit. The three nuchal organs have the shape of three finger-shaped lobes pointing backwards. The peristomium consists only of lips on which the palps sit. The first segment is similar to the segments that follow, but it can be slightly larger, and the parapods and bristles protrude forward. Dorsal and ventral cirrus are absent. The gills are designed as flattened structures of the parapodia. There are numerous cirrus pygidium . The animals have no aciculae. All bristles are simple, but can be feather-shaped, modified capillary-shaped or shaped as thick spikes.
distribution and habitat
The annelid worms of the genus Poecilochaetus are distributed worldwide in warm temperate seas, but 3 species are known from the deep sea . The animals live in fine, soft sediment soils.
Development cycle
The many bristles of the genus Poecilochaetus are separate sexes. Their reproductive behavior is not yet known, although external fertilization is suspected. As far as is known, the larvae live as plankton for a long time .
Way of life
Little is known about the way of life of the Poecilochaetidae. The animals live in the sediment in self-dug U-shaped tunnels, which they line with slime and in which they maintain a stream of water. They feed as filter feeders or graze detritus from the substrate surface, for which they use their palps kept above the sediment surface. The eyelashes located on these transport the food particles to the mouth. The living tubes of a species are inhabited by commensal crabs of the Pinnotheridae family.
Systematics
The genus Poecilochaetus , first described by René-Édouard Claparède in 1875 , was first placed in the Spionidae family and in 1897 by Félix Mesnil in the Disomidae family, which in turn received the new name Trochochaetidae in 1963 from Marian Hope Pettibone due to a homonymy of the name Disoma , but established Lennart Hannerz 1956 a separate family Poecilochaetidae with this single genus.
species
The genus Poecilochaetus includes the following 31 species :
- Poecilochaetus australis Nonato, 1963
- Poecilochaetus bermudensis Hartman, 1965
- Poecilochaetus bifurcatus Imajima, 1989
- Poecilochaetus clavatus Imajima, 1989
- Poecilochaetus elongatus Imajima, 1989
- Poecilochaetus exmouthensis Hartmann-Schröder, 1980
- Poecilochaetus fauchaldi Pilato & Cantone, 1976
- Poecilochaetus fulgoris Claparède in Ehlers, 1875
- Poecilochaetus gallardoi Pilato & Cantone, 1976
- Poecilochaetus granulatus Imajima, 1989
- Poecilochaetus hystricosus Mackie, 1990
- Poecilochaetus ishikariensis Imajima, 1989
- Poecilochaetus japonicus Kitamori, 1965
- Poecilochaetus johnsoni Hartman, 1939
- Poecilochaetus koshikiensis Miura, 1988
- Poecilochaetus magnus Imajima, 1989
- Poecilochaetus martini Brantley, 2009
- Poecilochaetus modestus Rullier, 1965
- Poecilochaetus multibranchiatus Leon-Gonzalez, 1992
- Poecilochaetus paratropicus Gallardo, 1968
- Poecilochaetus perequensis Santos & Mackie, 2008
- Poecilochaetus polycirratus Santos & Mackie, 2008
- Poecilochaetus serpens Allen, 1904
- Poecilochaetus spinulosus Mackie, 1990
- Poecilochaetus tokyoensis Imajima, 1989
- Poecilochaetus trachyderma Read, 1986
- Poecilochaetus tricirratus Mackie, 1990
- Poecilochaetus trilobatus Imajima, 1989
- Poecilochaetus tropicus Okuda, 1937
- Poecilochaetus vietnamita Gallardo, 1968
- Poecilochaetus vitjazi Levenstein, 1962
literature
- Claparède 's report on the worms collected on the Lightning expedition. In: Ernst Ehlers (1875): Contributions to the knowledge of the vertical distribution of bristle worms in the sea. Journal for Scientific Zoology 25, pp. 1–102, here pp. 9–13, panels I – IV.
- Félix Mesnil (1897): Études de morphologie external chez les Annélides. II. Remarques complémentaires sur les Spionidiens. La famille nouvelle des Disomidiens. La place des Aonides (sensu Tauber, Levinsen). Bulletin scientifique de la France et de la Belgique 30, pp. 83-100, here pp. 94-98. La famille des Disomidæ .
- Lennart Hannerz (1956): Larval development of the polychaete families Spionidae Sars, Disomidae Mesnil, and Poecilochaetidae n. Fam. in the Gullmar Fjord (Sweden). Zoologiska Bidrag frän Uppsala 31, pp. 1–204.
- Gesa Hartmann-Schröder (1996): Annelida, Borstenwürmer, Polychaeta. Tierwelt Deutschlands 58, pp. 1–648, here p. 295. Family Poecilochaetidae Hannerz, 1956
- Stanley J. Edmonds: Fauna of Australia, Volume 4A. Polychaetes & Allies. The Southern Synthesis 4. Commonwealth of Australia, 2000. Class Polychaeta. Pp. 264f., Family Poecilochaetidae.
Web links
Individual evidence
- ↑ Poecilochaetus Claparède in Ehlers, 1875. WoRMS , 2018. Retrieved on January 3, 2019.