Cheiriphotis trifurcata, new species (Crustacea, Amphipoda, Corophiidae, Protomedeiinae) from the Seagrass Bed of the Lower Gulf of Thailand

Koraon Wongkamhaeng,Ratchaneekorn Puttapreecha,Azman Abdul Rahim

doi:10.3897/zookeys.187.3219

Abstract

A new species of corophiid Amphipoda, Cheiriphotis trifurcata, collected from the seagrass bed of the Lower Gulf of Thailand, is described. Cheiriphotis trifurcata is characterized by its trifurcated tip of the modified setae on the outer ramus in male pleopod 3. In this paper, the new species is fully described and compared with related species and a complete key of the 16 valid species in the genus Cheiriphotis is given.

Highlights

Species of the genus Cheiriphotis Walker, 1904, are predominant and widespread in both marine circumtropical and warm-temperate waters of the world
Salman and Jabbar (1990) redescribed C. megacheles based on material collected from the north-west of the Arabian Gulf and found that the variation between Giles’s and Walkers’ specimens is not an ontogeny, instead they are two distinct species
In the present study we provide a detailed description and illustration of both male and female species of Cheiriphotis trifurcata new species collected from the seagrass bed area

Summary

Introduction

Species of the genus Cheiriphotis Walker, 1904, are predominant and widespread in both marine circumtropical and warm-temperate waters of the world. Gnathopod 1 subchelate, smaller than gnathopod 2; coxal plate subtriangular, produced anteriorly with long fine setae on anteroventral corner; length ratio of articles from basis to dactylus about 14:5:6:13:10:9; basis slender, broader distally, posterior margin bearing long setae; ischium short, subrectangular with apical setae; merus subtriangular with posteromarginal setae, longer than ischium; carpus longer than propodus with plumose setae on posterior margin; propodus shorter than dactylus, palm oblique with a robust seta at the proximal half, surface of palm toothed; dactylus slightly longer than palm, falcate, inner margin with a robust seta,.

Results

Conclusion