Platycopiidae
Platycopia perplexa
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Copepoda
Infraclass: Progymnoplea
Lang, 1948
Order: Platycopioida
Fosshagen, 1985
Family: Platycopiidae
G. O. Sars, 1911
Genera

Platycopiidae is a family of copepods. Until the description of Nanocopia in 1988, it contained the single genus Platycopia.[1] It now contains four genera, three of which are monotypic; the exception is Platycopia, with 8 species.

Systematics

The family Platycopiidae was erected by Georg Ossian Sars when he described the new species P. perplexa, and included it in the order Calanoida.[2] In 1948, Karl Georg Herman Lang erected a new suborder, Progymnoplea, for the family, and in 1985, Audun Fosshagen & Thomas Iliffe created the order Platycopioida to contain the Platycopiidae, initially placed alongside Calanoida in the superorder Gymnoplea.[2] Most recently, Huys & Boxshall inferred that Platycopiidae was the earliest branching copepod lineage, making it the sister taxon to all other copepods; they therefore raised Progymnoplea to the rank of infraclass, to accommodate Platycopioida alone, with all other copepods being placed in the Neocopepoda.[2]

Members of the Platycopiidae have a primitive form, thought to be similar to the most recent common ancestor of all copepods. Few synapormorphies have been found to unite the family, but they include the presence of a second dorsal seta (hair) on particular segments of the legs.[3] They share with calanoid copepods the possession of Von Vaupel Klein's organ, a sensory organ near the base of the first swimming leg.[3]

Members

Antrisocopia prehensilis Fosshagen, 1985 is a critically endangered species from a limestone anchialine cave in Bermuda, known from only five mature specimens.[4]

Nanocopia minuta Fosshagen, 1988 is a critically endangered species from the same anchialine cave as Antrisocopia, and is known from only two specimens.[5]

Sarsicopia polaris Martínez Arbizu, 1997 was collected in 1993 from a depth of 534 metres (1,752 ft) in the Barents Sea.[2]

Platycopia comprises eight species, distributed in the North Sea, the eastern seaboard of North America, the Bahamas, Mauritania and Japan.[2] The first species to be described was P. perplexa, named by Georg Ossian Sars in 1911.[2]

References

  1. ↑ Fosshagen, Audun; Iliffe, Thomas M. (1988). "A new genus of Platycopioida (Copepoda) from a marine cave on Bermuda". Hydrobiologia. 167: 357–361. doi:10.1007/bf00026325. S2CID 38512647.
  2. 1 2 3 4 5 6 Arbizu, Pedro Martínez (1997). "Sarsicopia polaris gen. et sp.n., the first Platycopioida (Copepoda: Crustacea) from the Arctic Ocean, and its phylogenetic significance". Hydrobiologia. 350 (1–3): 35–47. doi:10.1023/A:1003020829836. S2CID 13634167.
  3. 1 2 Ferrari, Frank D.; Dahms, Hans-Uwe (2007). "Post-embryonic development of the Copepoda" (PDF). Crustaceana Monographs. 8: 1–226. ISBN 978-90-04-15713-2.
  4. ↑ T. M. Iliffe (1996). "Antrisocopia prehensilis". IUCN Red List of Threatened Species. 1996: e.T1784A7539000. doi:10.2305/IUCN.UK.1996.RLTS.T1784A7539000.en.
  5. ↑ T. M. Iliffe (1996). "Nanocopia minuta". IUCN Red List of Threatened Species. 1996: e.T14331A4433047. doi:10.2305/IUCN.UK.1996.RLTS.T14331A4433047.en.
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