Abstract
A new harpacticoid copepod is described from the waters off Jeju Island, Korea. This species displays a unique set of characteristics including a rostrum that is clearly demarcated from the cephalosome, a setular (spinular) row on the rostrum, a well-developed frill along the posterior margins of each body segment except for the cephalosome, long and cylindrical caudal rami, four segmented female antennules, paired genital apertures in the female, the absence of sexual dimorphism in legs P1–P4, and highly reduced P5 and P6 in the male. This combination of characteristics allocates the specimen to the family Nannopodidae Por, 1986, but the new species belongs to none of the extant genera within the family. A new genus, Doolia, is proposed. Nannopus is suggested as a sister taxon of the new genus based on shared plesiomorphic characteristics in the maxilliped, legs P1–P4, and P5. Doolia gen. nov. is the eighth genus of Nannopodidae, and an amended key for the genus is provided herein.
Highlights
The present study aims to describe this new taxon and establish a new genus based on the current specimens from Korea
The family Nannopodidae Por, 1986 could harbor the combination of these character sets based on character comparisons (Table 1)
Among the seven extant genera of the Nannopodidae, Nannopus Brady, 1880 is the only member having the rostrum fused to the cephalothorax, while all other genera have basally-defined rostrum, as in the new species (Table 1)
Summary
1905, establishing four new families: Paranannopidae Por, 1986, Huntemanniidae Por, 1986, Rhizotrichidae Por, 1986, and Argestidae Por, 1986. Among Por’s new families, Huys [3] synonimized Huntemanniidae with Nannopodidae Brady, 1880. Two genera, Metahuntemannia Smirnov, 1946 and Talpina Dahms & Pottek, 1982 were re-allocated to the subfamily Hemimesochrinae Por, 1986 in the Canthocamptidae Brady, 1880 based on their affinities with genera including Bathycamptus Huys & Thistle, 1989, Micropsammis Mielke, 1975, Isthmiocaris. Nannopodidae includes about 25 valid species in seven genera: Nannopus Brady, 1880, Pontopolites T.Scott, 1894, Huntemannia Poppe, 1884, Rosacletodes Wells, 1985, Laophontisochra George, 2002, Acuticoxa Huys & Kihara, 2010, and Talpacoxa Corgosinho, 2012. During a study of the harpacticoid copepods in Korean Waters, a nannopodid-like copepod was collected; the specimens could not be allocated to any extant genera in the family.
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