Guernea yamminye Thomas &amp; Barnard 1991
Creators: name: Myers, Alan A.
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Dexaminidae
Guernea
Guernea yamminye

description: <i>Guernea yamminye</i> Thomas &amp; Barnard, 1991 (Figs 5, 6, Pl. 3B) <i>Guernea yamminye</i> Thomas &amp; Barnard, 1991: 306–309, figs 4(part)–6. <b>Material examined.</b> 1 male, AM P70893 (QLD 1653); 1 female, AM P71216 (QLD 1758); 1 female, AM P71257 (QLD 1771); 1 male, AM P71302 (QLD 1761); 1 female, 1 juvenile, AM P71305 (QLD 1772); 1 male, AM P71309 (QLD 1756); 1 juvenile, AM P71313 (QLD 1779); 1 male, AM P71342 (QLD 1805); 97 males, AM P71408 (QLD 1805); 2 females, AM P71446 (QLD 1814); 6 males, AM P71514 (QLD 1805). <b>Type Locality.</b> Near Mermaid Beach, Lizard Island, Queensland, Australia (~ 14°39’S 145°27’E). <b>Description.</b> Based on 1 female, 2.6 mm, AM P71216; 1 female, 2.1 mm, AM P71257; 1 female, 3.5 mm, AM P71305. <b>Head.</b> <i>Head</i> lateral lobes acute or subacute. <i>Eye</i> medium, smaller than lateral lobe. <i>Antenna 1</i> peduncle article 1 without short, dense brush setae lining posterior margin. <i>Antenna 2</i> short, not longer than head; peduncle article 4 without short, dense brush setae lining anterior margin; flagellum short, 3-articulate. <i>Mandible</i> palp absent. <i>Maxilla 1</i> palp stout, about three times as long as broad, without apical spout, with 1 apical slender seta. <i>Maxilla 2</i> inner plate shorter than outer plate, with sparse apical slender setae, inner margin without setae. <i>Maxilliped</i> palp 4-articulate. <b>Pereon.</b> <i>Gnathopod 2</i> carpus approximately one and one-half times length of propodus. <i>Pereopods 3–7</i> simple or scarcely prehensile. <i>Pereopod 3</i> carpus with large robust setae on posterior margin. <i>Pereopod 5</i> coxa posterior lobe well-developed, subequal to anterior lobe in depth. <i>Pereopods 5–7</i> of diverse morphology. <i>Pereopod 6</i> basis, posterior margin concave. <i>Pereopod 7</i> coxal gill absent; merus and carpus expanded; carpus broadly ovate, partially enveloping propodus; propodus approximately one-half length of carpus. <b>Pleon.</b> <i>Urosomite 1</i> with dorsal hump, without dorsal keel, with 1 median dorsal carina. <i>Urosomite 2–3</i> fused, with 2 dorsal humps, with 2 dorsolateral carinae, without dorsal robust setae. <i>Uropods 1–2</i> inner ramus subequal in length to outer; apical robust setae of rami elongate, at least one-half length of corresponding ramus. <i>Uropod 1</i> peduncle with basofacial slender setae. <i>Uropod 3</i> peduncle with distolateral robust seta; inner ramus, inner margin with single short plumose slender seta; outer ramus, inner margin without long plumose slender setae, outer margin with robust seta. <i>Telson</i> lobes with slender apical setae. <b>Colour in life.</b> Ivory overall, with a few small scattered rusty spots and faint banding on the antennae. The eye is mostly white, with a few red or rust-coloured ommatidia. Juveniles are similarly coloured Male (sexually dimorphic characters). Based on 1 male, 2.2 mm, AM P71302; 1 male, 2.3 mm, AM P71309; 6 males, 2.1–2.6 mm, AM P71514. <i>Eye</i> bright red. <i>Antenna 1–2</i> peduncle, all body segments and proximal parts of the coxae, pale rusty orange with darker markings in some areas. <i>Eye</i> very large, covering most of lateral lobe. <i>Antenna 2</i> moderately long, approximately half length of body; peduncle article 4 with short, dense brush setae lining anterior margin; flagellum long, multiarticulate. <i>Maxilla 1</i> palp without apical slender setae. <i>Uropod 3</i> inner ramus, inner margin with long plumose slender setae; outer ramus, inner margin with long plumose slender setae. <b>Habitat.</b> On rubble, sand or mud bottoms, occasionally with algae or seagrasses, on patch reefs or in back reef areas. Occurs at depths of 1– 25 m. Males often found in night plankton. <b>Remarks.</b> <i>Guernea yamminye</i> can be distinguished from all other Australian members of the genus by the distinctive "triple-humped" morphology of the urosome. Only four other known species of <i>Guernea</i> exhibit this urosomal morphology: <i>G. coalita</i> (Norman, 1868) from the north-eastern Atlantic and Mediterranean; <i>G. longicornis</i> Ledoyer, 1983 from Madagascar; <i>G. reticulata</i> (Schellenberg, 1938) from the Bismarck Archipelago; and <i>G. tumulosa</i> Griffiths, 1976 from South Africa. <i>Guernea yamminye</i> differs from <i>G. coalita</i> in the 1-articulate palp of maxilla 1 (palp 2-articulate in <i>G. coalita</i>), the excavate posterior margin of pereopod 6 (not excavate in <i>G. coalita</i>) and the short propodus of pereopod 7 partially enveloped by the carpus ((propodus long, not enveloped by the carpus in <i>G. coalita</i>). It differs from <i>G. longicornis</i> in the excavate posterior margin of the basis of pereopod 6 (not excavate in <i>G. longicornis</i>) and the presence of a short robust seta on the outer margin of the outer ramus of uropod 3 in both sexes and a short plumose slender seta on the inner margin of the inner ramus in the female (these are lacking in <i>G. longicornis</i>). <i>Guernea yamminye</i> differs from <i>G reticulata</i> in the lack of crenulations on the posterior margin of the basis of pereopod 7 (margin crenulate in <i>G. reticulata</i>) and by having a less well-developed posterodistal lobe on the carpus of that appendage. It can be distinguished from <i>G. tumulosa</i> by the 1-articulate palp of maxilla 1 (2-articulate in <i>G. tumulosa</i>) and by the subequal rami and elongate apical robust setae of uropods 1–2 (inner ramus shorter than outer and apical robust setae short in <i>G. tumulosa</i>). <b>Distribution.</b> <i>Australia</i>. Queensland: Lizard Island, Yonge Reef (Thomas &amp; Barnard 1991, current study).
description: Published as part of <i>Myers, Alan A., 2009, Dexaminidae *, pp. 393-424 in Zootaxa 2260 (1)</i> on pages 400-403, DOI: 10.11646/zootaxa.2260.1.20, http://zenodo.org/record/5319784
description: {"references": ["Thomas, J. D. &amp; J. L. Barnard (1991) Guernea ipilya and G. yamminye, new species (Crustacea: Amphipoda: Dexaminidae), from the Great Barrier Reef, Australia. Memoirs of the Museum of Victoria, 52 (2), 299 - 310.", "Norman, A. M. (1868) On Crustacea Amphipoda new to science or to Britain. Annals and Magazine of Natural History, series 4, 2, 411 - 421.", "Ledoyer, M. (1983) Crustaces amphipodes gammariens. Familles des Acanthonotozomatidae a Gammaridae. Faune de Madagascar 59 (1), 1 - 598.", "Schellenberg, A. (1938) Litorale amphipoden des tropischen Pazifiks. Kunglia Svenska Vetenskapsakademiens Handlingar, Tredje Serien, 16 (6), 1 - 105.", "Griffiths, C. L. (1976) Some new and notable Amphipoda from southern Africa. Annals of the South African Museum, 72, 11 - 35."]}