Iphimedia mizegwadan, 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 : 241-244

publication ID

https://doi.org/10.5281/zenodo.4619401

persistent identifier

https://treatment.plazi.org/id/2D1A87F3-B853-FFF1-86F2-FD66FD6F1352

treatment provided by

Carolina

scientific name

Iphimedia mizegwadan
status

new species

Iphimedia mizegwadan , new species

( Figs. 21-23 View Fig View Fig View Fig )

Material examined. – Holotype – sex not known, 4.2 mm, AM P64444 View Materials , Mizegwadan reef, 5 09.57’S 145 39.46’E, Madang Lagoon, Papua New Guinea, rubble, 3–4 m, coll. J. D. Thomas, 16 Feb.1990 stn JDT/PNG 48f. GoogleMaps

Paratypes – 1 specimen, AM P64445 View Materials , Mizegwadan Reef, 5 08.31’S 145 49.36’E, rubble, 12-15 m, coll. J. D. Thomas, 28 Jan.1990, stn JDT/ PNG GoogleMaps 25c; 1 specimen, AM P64446 View Materials , Mizegwadan reef, 5 09.57’S 145 39.46’E, Madang Lagoon , Papua New Guinea GoogleMaps , rubble, 3–4 m, coll. J. D. Thomas, 16 Feb.1990 stn JDT/ PNG 48f; 1 specimen, AM P64447 View Materials , gully in south entrance of Dam Awan, 5 09.27’S 145 49.86’E, rubble and sediment, J. D. Thomas, 22 Feb.1990, stn JDT/ PNG GoogleMaps 57l; 1 specimen, AM P64448 View Materials , western margin of Guzem reef, 5 09.35’E 145 48.43’E, rubble, mainly encrusted Acropora rubble, 2 m, coll. J. D. Thomas, 16 Apr.1991, stn JDT/ PNG 71f.

Type locality. – Mizegwadan reef, 5 09.57’S 145 39.46’E, Madang Lagoon , Papua New Guinea GoogleMaps .

Description. – Head laterocephalic margin without spine, ventrolateral corner an acute spine; eyes ovate. Antenna 1 peduncular article 1 with posterodorsal spines, without posteroventral spine; peduncular article 2 with posterodorsal spine, without posteroventral spine. Maxilla 1 palp well developed, about as long or longer than outer plate, 2- articulate.

Pereon. Pereonite 1 enlarged. Gnathopod 1 coxa small, ventrally truncated, ventral margins smooth. Gnathopod 2 coxa small, ventrally acute, ventral margins smooth. Pereopod 3 coxa posteroventrally subacute, 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 as long as or longer than carpus. Pereopod 6 coxa posteroventral corner subquadrate; basis posterodorsal corner with spine, posterior margin without spines, smooth, posteroventral corner without spines, rounded; merus posteroventral lobe longer than carpus. Pereopod 7 coxa with posteroventral spine; basis posterodorsal corner rounded, posterior margin with 4 spines, weakly serrate, posteroventral corner with small spine; merus posteroventral lobe longer than carpus. Pereonite 7 without mid-dorsal carina, dorsodistal margin with two small spines. Pleon. Pleonite 1 without mid-dorsal carina, dorsodistal margin not produced, with 2 small spines. Pleonite 2 without mid-dorsal carina, dorsodistal margin not produced, with 2 small spines. Pleonite 3 without mid-dorsal carina, dorsodistal margin not 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 rounded. Epimeron 3 posterior margin with 1 ventrolateral, straight, smooth spine, posteroventral corner produced into a small, smooth spine. Telson notched, slightly longer than broad, parallel sided, with pair of dorsodistal fine setae.

Remarks. – The ornamentation of the pereopod 7 basis is unique among the described species of Iphimedia . The unproduced dorsodistal margin of pereonite 7 is also found in few other species.

Distribution. – Papua New Guinea.

Etymology. – Named for Mizegwadan reef, the type locality.

AM

Australian Museum