The Composition, Structure, and Distribution of Benthic Ostracod Fauna (Ostracoda: Myodocopida) in Subantarctic Waters
2021
Chavtur, V. G. | Bashmanov, A. G.
This paper presents an analysis of the literature data on the Subantarctic fauna of the benthic Myodocopida, including 97 species. The studied fauna is characterized by a high degree but a low level of endemism. The fauna is based on the species of common genera. Ostracods of the families Cylindroleberididae and Cypridinidae lead in the number of species and genera. With depth increase, species richness of ostracods, and the number of their genera decrease; taxonomic and bathymetric characteristics markedly change. Similarities between the Antarctic and Subantarctic faunas of Myodocopida are evident in the low diversity of species, in the high degree and low rank of endemism, and in the proportion of the number of species and genera in families. Differences between the faunas are defined by significant isolation, by the pattern of vertical distribution, and by the taxonomic structure of myodocopids. The Subantarctic fauna of Myodocopida is completely isolated from the boreal fauna and exceeds it in the number of species and genera but is comparable to the boreal fauna in the number of endemic species. Both faunas are characterized by a high degree but a low level of endemism. Species richness of these faunas depends on different families. With a depth increase the number of myodocopid species decreases in both faunas; myodocopids do not penetrate deeper than 5500 m.
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