Minute but constant morphological differences within members of Stenothoidae: the Stenothoe gallensis group with four new members, keys to Stenothoe worldwide, a new species of Parametopa and Sudanea n. gen. (Crustacea: Amphipoda) Author Krapp-Schickel, Traudl text Journal of Natural History 2015 2015-03-31 49 37 2309 2377 journal article 21125 10.1080/00222933.2015.1021873 f9d0e547-ce5a-4814-be05-19540309c2df 1464-5262 4000077 Sudanea inopinata n. sp. ( Figures 28 , 29 ) Holotype Male 2 mm , Flamingo Bay , Port Sudan , reef with epiphytic algae, 12/1970 U. Schiecke coll., slide MVRCr 7710 . Additional material Female 2 mm on slide MVRCr 7711, nine juv. 1.2–1.5 mm in alcohol. Type locality Port Sudan , Red Sea . Etymology The epithet reflects the region inhabited by the species, at Port Sudan . Diagnosis Md without palp; Mx 2 in riding position. Gn 1: Gn 2 subequal in length, but Gn 1 clearly wider. Gn 2 with parallel margins. P 6, 7 basis widened with posterodistal lobe, much longer than wide. U 2 with unequal rami, U 3 ratio ramus: peduncle = 2. Telson naked. Description Length. 1.5–2 mm . Head. Antennae subequal in length, length of A 1 ped. art 1> art 2, art 3 about half art 1; flagellum with 7–8 arts. A 2 peduncle art 4 subequal art 5, flagellum with four arts. Mouthparts: Mx 2 lobes in riding position; Md palp lacking; Mxp narrow, OP vanishing. Peraeon. Gn 1 subchelate, merus reaching end of carpus, distally not acute but rounded ending; propodus ovoid to triangular, palm oblique, about half length of propodus; palmar corner defined by one strong spine. Cx 2 anterior margin irregularly convex, posterior margin straight; Gn 2 basis on anterior margin naked; carpus triangular, longer than wide, rounded; propodus with totally parallel margins, palm short, oblique, beset with short spines; palmar corner well defined by one srong spine; dactylus about one third length of propodus. Cx 3 with parallel margins, smooth; Cx 4 deeper than wide. Peraeopods: P 3> P 4; P 5 basis rectilinear, dactylus ≥ half length of propodus; anterior and posterior margins of merus, carpus and propodus with few spines; P 6, 7 basis widened, merus on posterior margin with spines, posterior margin neither widened nor lengthened. Figure 28. Sudanea inopinata n. g. n. sp. female, Red Sea: A 1, 2 = antennae; Hd = head; Mx 2 = second maxilla; Md, Md’ = mandible of both sides; Mxp = maxilliped; Gn 1 = first gnathopod; Gn 2 = second gnathopod. Figure 29. Sudanea inopinata n. g. n. sp. female, Red Sea: Cx 2–4 = coxae 2–4; Gn 1, 2 = first and second gnathopod; P 3 7 = peraeopod 3-7; U 1–3 = uropod 1–3; T = telson. Pleon: U 1–3 peduncle poorly spinose; U 1 ped subequal to subequal rami; U 2 rami unequal; U 3 length of ramus art 1 = art 2 = peduncle; T naked. Distribution Port Sudan , Red Sea .