| Platycopiidae | |
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| Platycopia perplexa | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Copepoda |
| Infraclass: | Progymnoplea Lang, 1948 |
| Order: | Platycopioida Fosshagen, 1985 |
| Family: | Platycopiidae G. O. Sars, 1911 |
| Genera | |
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Platycopiidae is a familyofcopepods. 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.
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]
Antrisocopia prehensilis Fosshagen, 1985 is a critically endangered species from a limestone anchialine caveinBermuda, 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 seaboardofNorth America, the Bahamas, Mauritania and Japan.[2] The first species to be described was P. perplexa, named by Georg Ossian Sars in 1911.[2]
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