Desmoscolecida
| Description | Desmoscolecida is an order of marine nematodes. In a worm of this order, the body tapers towards each end and is marked by a number of well-defined ridges. Their number varies in the different species. The head bears four movable setae, and some of the ridges bear a pair either dorsally or ventrally. Two pigment spots between the fourth and fifth ridges are regarded as eyes. The Desmoscolecida move by looping their bodies like geometrid caterpillars or leeches, as well as by creeping on their setae. The mouth is terminal, and leads into a muscular oesophagus which opens into a straight intestine terminating in an anus, which is said to be dorsal in position. The sexes are distinct. The testis is single, and its duct opens into the intestine and is provided with two chitinous spicules. The ovary is also single, opening independently and anterior to the anus. The nervous system is as yet unknown. From Wikipedia article at https://en.wikipedia.org/wiki/Desmoscolecida, which is released under the Creative Commons Attribution-Share-Alike License 3.0. | ||||||||||||||||||||||||||||||||||||||||||
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| Source Data |
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| Rank | order | ||||||||||||||||||||||||||||||||||||||||||
| Taxonomy (GBIF) | Life : Animalia : Nematoda : Adenophorea : Desmoscolecida | ||||||||||||||||||||||||||||||||||||||||||
| Taxonomy (PBDB) | Life : Animalia : Nematoda : Enoplea : Desmoscolecida | ||||||||||||||||||||||||||||||||||||||||||
| Taxonomic Status (GBIF) | accepted | ||||||||||||||||||||||||||||||||||||||||||
| Classification (PBDB,GBIF) |
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| Scientific Name | Desmoscolecida | ||||||||||||||||||||||||||||||||||||||||||
| Opinions (PBDB) |
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| Status (PBDB) | extant | ||||||||||||||||||||||||||||||||||||||||||
| Taxon Size (PBDB) | 5 | ||||||||||||||||||||||||||||||||||||||||||
| Extant Size (PBDB) | 2 (40%) | ||||||||||||||||||||||||||||||||||||||||||
| First Recorded Appearance | 197 - 190 Ma Early Jurassic | ||||||||||||||||||||||||||||||||||||||||||
| Primary Reference (PBDB) | G. O. Poinar. 2011. The Evolutionary History of Nematodes: As Revealed in Stone, Amber and Mummies | ||||||||||||||||||||||||||||||||||||||||||
| Common Name(s) | デスモスコレックス | ||||||||||||||||||||||||||||||||||||||||||
| Wikipedia | https://en.wikipedia.org/wiki/Desmoscolecida |
Fossil Distribution
Subtaxa
| Name | Status | Common Name(s) | Fossil Occurrences | Oldest | Youngest |
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| Desmoscolecoidea superfamily | listed (PBDB) | 1 | 197 Ma Early Jurassic | 0 Ma Extant | |
| Cyartonematidae family | accepted (GBIF) | No associated record in PBDB | |||
| Desmoscolecidae family | accepted (GBIF) | No associated record in PBDB | |||
| Eophasmidae family | accepted (GBIF) | No associated record in PBDB | |||
| Greeffiellidae family | accepted (GBIF) | No associated record in PBDB | |||
| Meyliidae family | accepted (GBIF) | No associated record in PBDB | |||
Synonymy List
| Year | Name and Author |
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| 1929 | Desmoscolecida Filipjev |
| 2011 | Desmoscolecida Poinar p. 276 |
References
