Paranamixis jiigurru White &amp; Thomas, 2009, sp. nov.
Creators: name: White, Kristine N.
name: Thomas, James Darwin
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Leucothoidae
Paranamixis
Paranamixis jiigurru

description: <i>Paranamixis jiigurru</i> sp. nov. (Figs 33, 34 <b>)</b> <b>Type material.</b> Holotype, male, 2.7 mm, AM P79818; Picnic Beach, Palfrey Island, Lizard Island (14°41.70'S 145°26.92'E), subtidal, patch reef, rubble patch with sand bottom, 2 m, S.E. LeCroy, 3 July 2001 (SEL/LZI-2-1). <b>Type locality.</b> Palfrey Island, Lizard Island, Queensland, Australia (14°41.70'S 145°26.92'E). <b>Etymology.</b> After the native Dingaal Aboriginal word, ‘ <i>Jiigurru</i> ’, meaning ‘ <i>Lizard Island</i> ’ and referring to the type locality. The Dingaal tribe believed that the Lizard Island group was created in the dreamtime and saw it as a stingray, with Lizard Island forming the body and Palfrey Island forming part of the tail. <b>Description.</b> Based on holotype, male, 2.7 mm (anamorph), AM P79818. <b>Head.</b> <i>Head</i> length less than pereonite 1+2, anterior margin truncate, without serrations or teeth, anterodistal margin quadrate with cusp; head defined by 1 acute tooth, ventral cephalic keel oblique, rostrum small to medium; eyes with 10 or more ocelli, round. <i>Antenna 1</i> 0.4 x body length; flagellum 7-articulate, peduncle width more than 2 x article 2. <i>Antenna 2</i> 0.3 x body length, shorter than antenna 1; flagellum 3- articulate. <i>Maxilliped</i> inner plates fused, distally rounded; outer plate smooth, lacking inner lobes; palp 4 articulate, palp article 4 elongate, slender, strongly recurved. <b>Pereon.</b> <i>Coxae 1–4</i> relative widths 1.0:2.2:1.3:2.0. <i>Gnathopod 1</i> coxa reduced, smooth, bare, anterodistal corner produced, subtriangular, distal margin oblique, posterodistal margin subquadrate. <i>Gnathopod 1</i> absent. <i>Gnathopod 2</i> coxa length subequal to width, much wider than coxa 3, smooth, bare, anterodistally acute, distal margin convex with a rounded mid-distal projection, posterior margin tapered, facial setae absent; basis widened anterodistally, without tubercles or serrations, anterior and posterior margins bare; ischium bare; carpus 0.8 x propodus length, recurved, distally tapered, anterior margin smooth; propodus posterior margin concave, without teeth/serrations, with 1 mediofacial setal row displaced to midline, reaching 0.4 x propodus length, 1 row of 7 submarginal setae, palm convex, posteroproximal process absent, proximal margin extending past insertion of carpus; dactylus recurved, proximal margin smooth with 1 tubercle and 2 setae, anterior margin distally acute, reaching 0.6 x propodus length. <i>Pereopod 3</i> coxa length 1.2 x width, anterodistal corner over-riding distal face of coxa 2 and extending below it, smooth, bare, anterior margin subquadrate, distal margin slightly convex, posterior margin straight, facial setae absent. <i>Pereopod 4</i> coxa smooth, bare, anterior margin rounded, distal margin evenly rounded, posterior margin excavate, facial setae absent. <i>Pereopods 5–7</i> coxa facial setae absent; basis length width ratios 1:1.0, 1:1.1, 1:1.2, posterior margins smooth, bare. <b>Pleon.</b> <i>Epimera 1–3</i> bare. <i>Epimeron 3</i> posteroventral corner narrowly rounded. <i>Uropods 1–3</i> relative lengths 1.0:0.8:1.2; inner and outer ramus with robust setae. <i>Uropod 1</i> peduncle 0.6 x inner ramus length; outer ramus 0.7 x inner ramus length. <i>Uropod 2</i> peduncle 0.5 x inner ramus length; outer ramus 0.6 x inner ramus length. <i>Uropod 3</i> peduncle 1.3 x inner ramus length; outer ramus 0.8 x inner ramus length. <i>Telson</i> 1.3 x longer than wide, apex entire. <b>Female.</b> (sexually dimorphic characters). Leucomorphs unknown. <b>Habitat.</b> In coral rubble from a subtidal patch reef. <b>Remarks.</b> <i>Paranamixis jiigurru</i> <b>sp. nov.</b> is similar to <i>Paranamixis fijiensis</i> Thomas, 1997, the only other species of <i>Paranamixis</i> with fused inner plates on the maxilliped. According to Thomas (1997) this character may suggest that these are actually species of <i>Anamixis</i> that have lost gnathopod 1. <i>Paranamixis jiigurru</i> differs from <i>P. fijiensis</i> in its wider telson, its smooth gnathopod 2 basis and propodus palm, its bare pereopods 5 <i>–</i> 7 basis posterior margins and its coxa 2 angle. The head angle and the gnathopod 2 dactylus setation pattern are similar to <i>Paranamixis clarkae</i> Thomas, 1997, but again, <i>P. jiigurru</i> differs in its smooth gnathopod 2 basis and propodus palm. <b>Distribution.</b> <i>Australia</i>. Queensland: Lizard Island (current study).
description: Published as part of <i>White, Kristine N. &amp; Thomas, James Darwin, 2009, Leucothoidae *, pp. 494-555 in Zootaxa 2260 (1)</i> on page 548, DOI: 10.11646/zootaxa.2260.1.29, http://zenodo.org/record/5323471
description: {"references": ["Thomas, J. D. (1997) Systematics, ecology, and phylogeny of the Anamixidae (Crustacea: Amphipoda). Records of the Australian Museum, 49, 35 - 98."]}