Sudanea inopinata, Krapp-Schickel, 2015

Krapp-Schickel, Traudl, 2015, 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), Journal of Natural History 49 (37), pp. 2309-2377 : 2369-2372

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.

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.

Figures

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.