Parametopa gorea Krapp-Schickel 2015, n. sp.
Creators: name: Krapp-Schickel, Traudl
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Stenothoidae
Parametopa
Parametopa gorea

description: Parametopa gorea n. sp.
Figures 26, 27
Holotype
Adult specimen 3 mm from Gorée (island near Senegal) 17–3-53, ‘contenu stomacal de Spondyliosoma cantharum ’, slide MVRCr 7671.
Additional material
Fem. ov. 3 mm, fem. 2.5 mm, same locality, stored in alcohol at MVRCr.
Etymology
Collected on the coasts of Gorée, Italian Gorea, a small island off the coast of Senegal.
Diagnosis
Gn 1 propodus subchelate, merus reaching end of carpus; Gn 2 propodus anterior and posterior margin parallel, palm oblique, with several incisions and humps; basis with many robust spines on anterior margin; U 1–3 and T strongly spinose.
Description
Length. 2.5–3 mm.
Head. Antennae subequal in length, length of A 1 ped. art 1 = art 2, art 3 about one third; flagellum with 14 arts. A 2 peduncle art 4 somewhat longer than art 5, flagellum with eight arts. Mouthparts: Mx 1 palp with one art; 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, palm oblique, about half length of propodus. Cx 2 anterior margin regularly convex, posterior margin concave; Gn 2 basis on anterior margin beset with many strong spines; carpus triangular, length subequal to width; propodus with nearly parallel margins, palm oblique, with many more or less deep incisions and humps; dactylus about half length of propodus. Cx 3 narrow, with parallel margins, distally slightly serrate, Cx 4 much wider than deep, ovoid. Peraeopods: P 3> P 4; P 3 basis with many setae anteriorly; P 5 basis rectilinear, dactylus ≥ half length of propodus; anterior margin of merus, carpus and propodus with many spines; P 6, 7 basis widened, merus on both margins with spines, posterior one widened and lengthened, but not reaching half length of carpus.
Pleon: Ep 3 posteriorly bluntly produced; U 1–3 peduncle richly spinose; U 1 ped> subequal rami; U 2 rami unequal; P 3 ped> ramus, length of ramus art 1 = art 2; T with 5 pairs of spines marginally.
Distribution
Senegal, Atlantic O.
Key to Parametopa species
1. Gn 2 propodus rectangular, palmar corner 90° (rectipalmate) or even less ..... 2
- Gn 2 propodus with oblique palm, palmar corner much more than 90° ......... 3
2. Gn 1 simple, Gn 2 palm concave; A 1 flagellum with 4 arts, U 3 ramus art 1 naked ................................... P. crassicornis Just, 1980 (3.2 mm) NW Greenland
- Gn 1 simple to subchelate; Gn 2 palm straight; A 1 flagellum> 10 arts, U ramus art 1 with marginal spines .................................................................................... .................. P. kervillei Chevreux, 1901 (5 mm) French coast of English Channel
3. Gn 2 propodus palm with U-shaped excavation near palmar corner, palm defined by prominent elevation; P 5–7 with very few marginal spines; U 3 ramus and T naked ................................................. P. alaskensis (Holmes 1904) (? mm) Alaska
- Gn 2 propodus palm with several small incisions, palm defined by blunt corner; P 5–7 richly spinose on both margins; U 3 ramus and T densely beset with spines .................................................. P. gorea n. sp. (2.5–3 mm) West Africa, Senegal
Within the present material from the Red Sea, I found a stenothoid with Gn 1 similarly long as but wider than Gn 2:
description: Published as part of 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), pp. 2309-2377 in Journal of Natural History 49 (37) on pages 2365-2368, DOI: 10.1080/00222933.2015.1021873, http://zenodo.org/record/4000077