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image of Crustaceana

The deep-sea genus Ephyrina Smith, 1885, is reported for the first time from Taiwan. The specimens obtained all belong to one species. The Taiwanese material closely resembles E. figueirai Crosnier & Forest, 1973, in having double rows of lateral spines on each side of the telson, but consistently differs from the nominotypical form from the Atlantic in having a longer and more spinose telson, while also the dorsal depression on abdominal somite VI is slightly more pronounced. Comparison of additional specimens from the Philippines and from Madagascar shows that the West Pacific specimens are nearly identical, but the Madagascan material seems to have characters intermediate between the West Pacific and Atlantic forms. We decided to propose a subspecific status to the West Pacific population, in order to emphasize the slight but constant differences observed in the telson in this obviously allopatric form of the species.

Le genre d'eau profonde Ephyrina Smith, 1885, est signalé pour la première fois de Taiwan. Les spécimens récoltés appartiennent tous à la même espèce. Le matériel taiwanais ressemble beacoup à E. figueirai Crosnier & Forest, 1973, par la présence de doubles rangées d'épines latérales de chaque côté du telson, mais diffère notablement de la forme nominale typique d'Atlantique par un telson plus long et plus épineux, tandis que la dépression dorsale du somite abdominal VI est également légèrement plus prononcée. La comparaison avec des spécimens supplémentaires provenant des Philippines et de Madagascar montre que les spécimens du Pacifique ouest sont presque identiques, mais le matériel de Madagascar semble présenter des caractères intermédiaires entre les formes du Pacifique ouest et celles de l'Atlantique. Nous avons décidé de proposer un statut de sous-espèce pour la population du Pacifique ouest afin de marquer les différences, légères mais constantes, observées sur le telson chez cette forme manifestement allopatrique de l'espèce.

Affiliations: 1: Institute of Marine Biology, National Taiwan Ocean University, 2 Pei-Ning Road, Keelung, Taiwan, R.O.C.


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