Scientia Marina, Vol 70, No 1 (2006)

A new species of Mirocaris (Crustacea: Decapoda: Caridea: Alvinocarididae) associated with hydrothermal vents on the Central Indian Ridge, Indian Ocean


https://doi.org/10.3989/scimar.2006.70n1109

Tomoyuki Komai
Natural History Museum and Institute, Chiba, Japan

Joel W. Martin
Natural History Museum and Institute, Chiba, Japan

Krista Zala
Natural History Museum of Los Angeles County, United States

Shinji Tsuchida
Japan Agency for Marine-Earth Science Technology (JAMSTEC), Japan

Jun Hashimoto
Faculty of Fisheries, Nagasaki University, Japan

Abstract


Mirocaris indica, a new species of the caridean family Alvinocarididae, is described based on 17 specimens from hydrothermal vent fields on the Central Indian Ridge near the Rodriguez Triple Junction. The new species closely resembles the only known representative of Mirocaris, the Atlantic species M. fortunata (Martin and Christiansen). Shared major characters include the dorsoventrally flattened, unarmed rostrum, the presence of epipods on the third maxilliped through to the fourth pereopod with corresponding setobranchs on the first to fifth pereopods, and the lack of appendices internae on the third and fourth pleopods. However, the lack of submarginal rows of short to long stiff setae on the external surfaces of the fingers of the first chela distinguishes M. indica from M. fortunata, and may reflect a difference in feeding habit between the two species. Further, M. indica may attain a larger adult size than M. fortunata does.

Keywords


Crustacea; Decapoda; Caridea; Alvinocarididae; Mirocaris; new species; Central Indian Ridge; hydrothermal vent

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References


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