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JPR Advance Access originally published online on June 10, 2005
Journal of Plankton Research 2005 27(6):617-621; doi:10.1093/plankt/fbi037
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org.

SHORT COMMUNICATION

Hyperoche shihi sp. nov. (Crustacea : Peracarida : Amphipoda): a symbiont of a deep-living medusa in the Gulf of California

Rebeca Gasca*

El Colegio de la Frontera sur (ECOSUR), Unidad Chetumal, Carr. Chetumal-Calderitas KM 5.5, Apdo, Postal 424, C.P. 77000, Chetumal, Q. Roo, México and Research Associate, National Museum of Natural History, Smithsonian Institution, Washington, DC, USA

* Corresponding Author: rgasca{at}ecosur-qroo.mx

Received February 16, 2005; accepted in principle May 20, 2005; accepted for publication May 31, 2005; published online June 10, 2005
Communicating editor: K.J. Flynn

From samples of deep-water zooplankton obtained in the Gulf of California, an undescribed species of the genus Hyperoche Bovallius was collected. The new species is similar to Hyperoche medusarum Kröyer and Hyperoche luetkenides Walker. It differs from its congeners mainly by the strong, large chela of pereopod 2 and the absence of processes or denticles along the posterior distal margin of same structure. It was collected at a depth of 1136 m as a symbiont of the bathypelagic hydromedusa Chromatonema erythrogonon (Bigelow). The amphipod remained grasped to the medusa subumbrellar cavity. Seven other associations are known between hyperiids and jellies in the Gulf of California, most from the epipelagic layer. This is the only deep-living species of Hyperoche known.


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