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Species ID
OC-SP-0002287
Discovered
Phylum
Arthropoda
Species ID
OC-SP-0002287
Provisional Species Name
Pseudorchomene sp_MNHNCL AMP-16046
Lowest Valid Taxon Name in WoRMS
Pseudorchomene
Lowest Known Rank
Genus
Status
Discovered
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Embargo
No
Kingdom
Animalia
Phylum
Arthropoda
Class
Malacostraca
Order
Amphipoda
Family
Tryphosidae
Genus
Pseudorchomene
Date Identified
18/11/2020
Taxonomic Remarks
The genus Pseudorchomene comprises a group of lysianassid amphipods distributed in circum-Antarctic and circum-subantarctic regions, with a bathymetric range extending from the surface down to 2,889 meters depth. Ecologically, its members are characterized as opportunistic or obligate scavengers, capable of forming large swarms to feed on carrion. Pseudorchomene is readily recognized by its triangular coxa 1, a character exclusive to this genus. Within it, two groups can be distinguished: those with a slender, elongate gnathopod 1 and a convex anterior margin of basis, and those with a short, stocky gnathopod 1 and a straight anterior margin of basis. The specimens examined exhibit intermediate traits between these groups, further supporting their recognition as a new, undescribed species.
Received All Minimal Data for Discovery
04/03/2026
Description of Material
Orchomenid lysianassoid with gnathopod 1 coxa subtriangular. Somites of pereon and pleosome without posterior humps. Basis of gnathopod 1 with anterior margin convex; carpus and propodus robust (carpus length approx. 1.6x width, propodus approx. 2.5x width); palm transverse and distinctly convex.
Ecology
The specimens were collected using baited traps with beef, in subtidal environment.
Distribution
Known only from Contao, Hualaihue, Palena, Los Lagos Region, Chile, but apparently widely distributed in Patagonian seas.
Scientific Name Authorship
Pérez-Schultheiss
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