Iphimedia rachanoi, Lowry & Myers, 2003

Lowry, J. K. & Myers, A. A., 2003, New Amphipod Crustaceans From The Indo-West Pacific (Amathillopsidae: Eusiridae: Iphimediidae), Raffles Bulletin of Zoology 51 (2), pp. 219-256 : 247-250

publication ID	https://doi.org/ 10.5281/zenodo.4619401
persistent identifier	https://treatment.plazi.org/id/2D1A87F3-B859-FFF7-8707-FCE6FD7014AD
treatment provided by	Carolina
scientific name	Iphimedia rachanoi
status	sp. nov.

Treatment

Iphimedia rachanoi View in CoL , new species

( Figs. 27-29 View Fig View Fig View Fig )

Material examined. – Holotype, sex not known, 5.4 mm, ZMUC CRU-2155 , 98 18’N 7 22’E, Ko Racha Noi (south-eastern corner)

Phuket, Thailand, 18 m coral rock, N.L. Bruce, 30 Nov.1995, NLB D8/3 .

Type locality. – Phuket Island , Thailand (Andaman Sea) .

Description. – Head laterocephalic margin with rounded spine, ventrolateral corner a recurved spine; eyes ovate. Antenna 1 peduncular article 1 with posterodorsal and posteroventral spines; peduncular article 2 with posterodorsal spine and with small posteroventral spine; accessory flagellum absent. Maxilla 1 palp 2-articulate.

Pereon. Pereonite 1 enlarged, slightly produced over head. Gnathopod 1 coxa small, ventrally truncated, ventral margins smooth. Gnathopod 2 coxa small, ventrally truncated and posteroventrally subacute, ventral margins smooth. Pereopod 3 coxa ventrally truncated and posteroventrally acute, ventral margins smooth. Pereopod 4 coxa ventral margins smooth. Pereopod 5 coxa posteroventral corner broadly rounded; basis posterodorsal corner subquadrate, posterior margin without spines, smooth, posteroventral corner rounded; merus posteroventral lobe longer than carpus. Pereopod 6 coxa posteroventral corner subquadrate; basis posterodorsal corner with small spine, posterior margin without spines, smooth, posteroventral corner without spines, rounded; merus posteroventral lobe longer than carpus. Pereopod 7 coxa subquadrate; basis posterodorsal corner rounded, posterior margin with 3 spines (middle spine small), weakly serrate, posteroventral corner with small spine; merus posteroventral lobe longer than carpus. Pereonite 7 with 1 broadly rounded low mid-dorsal carina, dorsodistal margin slightly produced, with 2 large spines, without posteroventral spine.

Pleon. Pleonite 1 with a broadly rounded low mid-dorsal carina, dorsodistal margin slightly produced, with 2 large spines. Pleonite 2 with a broadly rounded low mid-dorsal carina, dorsodistal margin slightly produced, with 2 large spines. Pleonite 3 with a broadly rounded low mid-dorsal carina, dorsodistal margin slightly produced, with 2 straight spines. Epimeron 1 posterior margin with 1 mid-lateral spine; posteroventral corner rounded. Epimeron 2 posterior margin with 1 mid-lateral spine, posteroventral corner produced into a spine. Epimeron 3 posterior margin with 1 ventrolateral, recurved, smooth spine, posteroventral corner produced into a smooth spine. Telson notched, slightly longer than broad, parallel sided, with pair of dorsodistal fine setae.

Remarks. – This species can be distinguished from all other described world species of Iphimedia by the following combination of characters: head ventrolateral corner with a recurved spine, pereopod 7 basis posterior margin with 3 spines and pereonite 7 with a broadly rounded, low, middorsal carina.

Distribution. – Phuket Island, Thailand (Andaman Sea).

Etymology. – Named for Ko Racha Noi, the type locality.