Abstract
One individual referable to Calliopiidae G.O. Sars, 1893 was collected from a chemically reduced habitat, the hydrothermal vent systems in Okinawa Trough, and was identified as a new genus and species belonging to this family after a morphological examination. A formal description of this new species and a discussion of the relationship of the new genus within Calliopiidae are presented.
Highlights
The calliopiids have been placed in the Eusiroidea Stebbing, 1888 (e.g., Bousfield & Hendrycks 1995, 1997; De Broyer et al 2007)
A phylogenetic study based on morphology by Lowry & Myers (2013) showed that the Calliopiidae G.O
The calliopiids reported from vent fields are represented by two species: Bouvierella curtirama BellanSantini & Thurston, 1996 collected at a depth of 1636 m from the mid-Atlantic Ridge and Leptamphopus fragilis Larsen & Krapp-Schickel, 2007 collected at a depth of 2656 m near Wuzza Bare Mount, northeast Pacific (Bellan-Santini & Thurston 1996; Larsen & Krapp-Schickel 2007)
Summary
The calliopiids have been placed in the Eusiroidea Stebbing, 1888 (e.g., Bousfield & Hendrycks 1995, 1997; De Broyer et al 2007). 1943 and have a close relationship with Pontogeneiidae Stebbing, 1906. This family currently contains 27 genera and more. The new species does not belong to any of the described genera within this family based on the combination of the following morphological characters: a small rostrum; the absence of the antennae calceoli; the article 3 of antenna 1 not produced apicoventrally; the inner plate of maxilla 1 bearing only one apical seta; the gnathopod 2 not linear or greatly elongate and the carpus of the gnathopods 1–2 much shorter than the propodus; pereopod 5 slightly longer than pereopod 7; epimeron 3 smooth; the outer ramus of uropod 3 half-length of the inner ramus; the entire telson, longer than broad. A key to all genera of Calliopiidae is presented
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