Galeatylus coripes Just 2019, sp. nov.
Creators: name: Just, Jean
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Atylidae
Galeatylus
Galeatylus coripes

description: Galeatylus coripes sp. nov.
Figures 1–3
Type fixation. Holotype, ♂, here designated.
Etymology. The epithet consist of the Latin cor (heart) and pes (foot) denoting the shape of the propodus of pereopods 3 and 4.
Material examined. Holotype, ♂, 3.3 mm. Australia, Bass Strait, 94 km N of North Point, Flinders Island, 38˚53.42’S 147˚55.06’E, 71 m, medium sand, R. Wilson, 17 November 1981, RV Tangaroa, stn BSS 171, NMV J62381 (unique).
Description. Rostrum massive, angularly truncate, overhanging half the length of antenna 1 article 1. Lateral head margin with 2 rectangular sharply pointed projections, with strong concavities above, between and below projections. Eyes oval, situated level with upper projection.
Antenna 1 short, about as long as pereonites 1–5 combined, peduncle article 1 as long as 2 and 3 combined, 3 half length of 2; article 1 with mid-dorsal projection carrying a few small pappose setae, accessory flagellum absent; flagellum as long as peduncle articles 2 and 3 and half of 1, with 6 articles. Antenna 2 about as long as pereonites 1–6 and half of 7 combined, article 5 nearly as long as 1–4 combined; flagellum of 6 articles, as long as peduncle article 5.
Mouthparts. Upper lip rounded triangular, broader than long, apex with tiny setules. Mandible molar rather cylindrical (left) and elongate pointed (right); palp of 3 articles, article 2 with a couple of small setae, article 3 with apical tuft of 1 long and 4 short setae. Lower lip main lobes broadly rounded, distally with small sharp setae and tiny setules; inner lobes broadly rounded with tiny setules apically. Maxilla 1 palp of 2 articles, article 2 much longer than 1 and overreaching outer lobe with about 1/4 its length, apex with 5 pointed robust setae; outer plate with oblique terminal row of 7 serrated spine-setae; inner plate short, distally tapering, with 2 apical plumose setae. Maxilla 2 outer plate distally rounded with dense row of setae; inner plate nearly as long as outer, more slender, apex with bunch of setae and single long plumose mediodistal seta. Maxilliped palp of 4 articles; outer plate reaching apex of palp article 2, with medial and apical row of spatulate setae; inner plate reaching half way along outer plate with 3 spatulate setae and a few simple setae on apical margin.
Pereonites 1–7 and pleonites 1–3 dorsally smooth; e pimeral plate 1 broadly rounded distally, plate 2 with angular posterodistal corner, plate 3 rounded posteriorly.
Coxal plates 1–4 simple, about as long as broad, distally rounded except plate 4 with nearly straight distal margin and acute posterodistal corner; plates 5 and 6 with tiny anterior lobe and large tapering posterior lobe; plate 7 broadest posteriorly.
Gnathopods 1 and 2 short; gnathopod 1 carpus and propodus of subequal length and width, cutting edge of propodus defined by 2 robust setae, posterior margin with an additional robust seta more proximal, cutting edge otherwise with several small simple setae; gnathopod 2 carpus about 1/5 longer than propodus, propodus cutting edge defined by 2 robust setae.
Pereopods 3 and 4 similar, nearly naked basis as long as ischium, merus and carpus combined, merus twice as long as carpus and propodus combined, carpus short, 1/5 length of merus, ring-shaped, about twice as broad as long, propodus inserted into carpus on a narrow stub with rest of article forming heart-shaped distally tapering segment, dactylus short, as long as broad, conical, unguis tiny, curved. Pereopods 5–7 similar except basis of pereopod 5 with rounded posteroproximal lobe and posterodistal acute blunt lobe, concave in between lobes; basis of pereopod 6 with larger rounded posteroproximal lobe, distal half of article tapering to ischium; basis of pereopod 7 posterior margin projecting in an broad, even, slightly scalloped curve with small setae in indentations, without posterodistal projection; merus of all 3 pereopods about as long as carpus and propodus combined, propodus length about 2/3 of carpus, joining carpus in ordinary fashion not heart-shaped, dactylus very short and broad, with small curved unguis. Penile papilla short, rounded.
Uropods 1–3 reaching back to almost the same point, with uropod 2 outer ramus slightly shorter, all rami with a few terminal robust setal; uropod 1 rami about 2/3 length of peduncle, with dorsal rows of robust setae; uropod 2 outer ramus 2/3 length of peduncle, inner ramus 3/4 length of peduncle both rami with short row of robust setae; uropod 3 peduncle about 1/3 length of outer ramus, rami of subequal length with few tiny setae, and a single dorsolateral robust setae on outer ramus.
Telson reaching to nearly half way along uropod 3 outer ramus, as long as broad, split slightly more than half length, each lobe with 2 doublets of small setae, 3 of them pappose, apices without robust setae.
description: Published as part of Just, Jean, 2019, Galeatylinae, a new subfamily of Atylidae for Galeatylus coripes, new genus and species, from the Bass Strait, south-eastern Australia (Amphipoda Dexaminoidea), pp. 291-295 in Zootaxa 4701 (3) on pages 293-295, DOI: 10.11646/zootaxa.4701.3.5, http://zenodo.org/record/3558055