Abstract
A new genus and species, Richerius marqueti gen. et sp. nov., of a crab of the family Hymenosomatidae MacLeay, 1838 are described from the inland waters of New Caledonia based on several specimens collected in two streams at altitudes of 180 m and 500 m, respectively. Richerius marqueti gen. et sp. nov. was compared to the other freshwater species known in New Caledonia, Odiomaris pilosus (A. Milne-Edwards, 1873), and to species of Amarinus Lucas, 1980, a genus comprising many freshwater species in New Zealand, Australia, Indonesia, the Philippines, and Papua New Guinea, but never recorded in New Caledonia. The barcode fragment of the COI mitochondrial gene was sequenced for seven specimens of R. marqueti gen. et sp. nov., and all sequences were deposited in GenBank. A brief and updated review of the New Caledonian marine and freshwater hymenosmatid fauna is provided.
Highlights
Over the last five years, two French expeditions (Hydrobio expeditions), as part of “Our Planet Reviewed”, a major exploration program of the natural world that the Muséum national d’histoire naturelle (MNHN) has been leading since 2006, managed to collect a number of specimens belongingEuropean Journal of Taxonomy 671: 1–29 (2020)to the family Hymenosomatidae MacLeay, 1838 from New Caledonia
To the family Hymenosomatidae MacLeay, 1838 from New Caledonia. They were caught in inland freshwaters in the North and South Provinces. To this material were added hymenosomatids obtained separately by some colleagues during previous biodiversity discovery expeditions led by the MNHN
In order to ease future studies, we sequenced the barcode fragment of the COI mitochondrial gene (Folmer et al 1994) for seven specimens of the new species Richerius marqueti gen. et sp. nov. (Table 1)
Summary
To the family Hymenosomatidae MacLeay, 1838 from New Caledonia. They were caught in inland freshwaters in the North and South Provinces. To this material were added hymenosomatids obtained separately by some colleagues during previous biodiversity discovery expeditions led by the MNHN. A hymenosomatid crab from two streams at altitudes of 180 m and 500 m, respectively, could not be assigned to the well known New Caledonian endemic freshwater species Odiomaris pilosus A new genus and a new species, Richerius marqueti gen. As the genus Amarinus appears to be paraphyletic, including a variable arrangement of the antennule and antenna, we have limited our comparison to the type species, A. lacustris (Chilton, 1882), freshwater
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