Mallacoota penelope HUGHES, 2011, sp. nov.
Creators: name: HUGHES, L. E.
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Maeridae
Mallacoota
Mallacoota penelope

description: <i>Mallacoota penelope</i> sp. nov. (Figs 37–39) <b>Type material.</b> Holotype: male, 8.2 mm, dissected, 4 slides, AM P.85224. Paratypes: 1 female (masculine phenotype), 6.1 mm, dissected, 1 slide, AM P.85225; 1 male, 10.0 mm, dissected, 1 slide AM P.85226; 1 female (masculine phenotype), 8.6 mm, AM P.85227; 3 hyperadults, AM P.85228; 30+ specimens, AM P.60447, east of Seal Islands, Victoria (38°56'30"S 148°19'18"E), 85 m, 27 August 1994, coll. P. Berents (SS05/94/59); 1 female (diminutive phenotype), 8.0 mm, dissected, 4 slides, AM P.85229; 8 males and 4 females (masculine phenotype), AM P.60441, east of Seal Islands (38°59'6"S 148°31'36"E), 125 m, benthic sled, 27 August 1994, coll. P.B. Berents (SS05/94/60). <b>Type locality.</b> East of Seal Islands, Victoria (38°56'30"S 148°19'18"E). <b>Etymology.</b> Named for the collector Dr Penelope Berents, used as a noun in apposition. <b>Description</b>. Based on holotype, male, 8.2 mm, AM P.85224. <b>Head.</b> Eyes ovate; lateral cephalic lobe broad, truncated, anteroventral margin with notch/slit. <i>Antenna 1</i> longer than antenna 2; peduncular article 1 shorter than article 2, <b>with 3 robust setae along posterior margin</b>; article 2 longer than article 3; flagellum articles longer than broad proximally, broader than long distally, with 20+ articles; <b>accessory flagellum minute, with 3 articles</b>. <i>Antenna 2</i> peduncular article 2 cone gland not reaching to end of peduncular article 3; article 4 subequal in length to article 5; flagellum with 11 articles. <i>Maxilla 1</i> inner plate subtriangular, with 2 apical plumose setae. <i>Lower lip</i> outer lobes with two pair of ducts, mandibular lobes apically rounded. <i>Mandible</i> accessory setal row well developed with 3 setae; molar well developed, triturative; mandibular palp well developed, 3-articulate; article 1 twice as long as broad, shorter than article 2; article 2 subequal to article 3, with 1 slender setae; article 3 rectolinear, long (5 times as long as broad), longer than article 1, with 2 medial and 2 apical setae. <b>Pereon.</b> <i>Gnathopod 1</i> coxa anterior margin straight, anteroventral corner produced, rounded; carpus about twice as long as broad, subequal in length to propodus; propodus medial surface with comb, palm acute, convex, entire, defined by posterodistal corner, with 2 posterodistal robust setae. <i>Gnathopod 2</i> subchelate; basis slender, anterodistal corner subquadrate; merus without distoventral corner; carpus compressed, lobate, projecting between merus and propodus; <b>propodus</b> massive, <b>with slender medial setal bunch, palm convex</b>, smooth, about half length of propodus, <b>subrectangular distomedial shelf, with 9 robust setae on shelf, palmar margin with 2 subacute teeth, defined by posteroventral tooth</b>, without posterodistal robust setae, subpalmar surface smooth; <b>dactylus with posteroproximal shelf, apically falcate</b>, closing along palm. <i>Pereopod 4</i> coxa posteroventral lobe well developed, with rounded posteromedial corner. <i>Pereopods 5–7</i> slender distally; basis linear, <b>posterior margin straight</b>, weakly serrate, posteroventral corner subquadrate; merus and carpus not broadened; carpus and propodus with long, slender setae along posterior margin; propodus not expanded posterodistally; dactylar ungues simple. <i>Pereonite 7</i> without carina. <b>Pleon.</b> <i>Pleonites 1–3</i> without carina. <i>Epimera 1–2</i> posteroventral corner with small acute tooth. <i>Epimeron 3</i> ventral margin smooth, posteroventral margin smooth, posteroventral corner produced acute. <i>Urosomite 1</i> bicarinate, subtriangular. <i>Urosomites 2–3</i> without carina. <i>Uropod 1</i> peduncle with 1 basofacial seta; outer ramus slightly shorter than inner ramus. <i>Uropod 2</i> outer ramus slightly shorter than inner ramus. <i>Uropod 3</i> rami distally truncated, apical robust setae long; inner ramus long (length 2.2 times breadth), subequal in length to outer ramus; outer ramus longer than peduncle. <i>Telson</i> deeply cleft, longer than broad, tapering distally, lobes apically truncated, with 4 long apical robust setae. <b>Female masculine phenotype.</b> (sexually dimorphic characters), based on AM P.85225. <b> <i>Gnathopod 2</i> propodus palm sculptured</b> , <b>subrectangular distomedial shelf with 11 robust setae</b>, <b>palm margin with 3 subacute teeth, defined by corner with 1 posterodistal robust setae</b>. <b>Female diminutive phenotype.</b> (sexually dimorphic characters), based on AM P.85229. <i>Gnathopod 2</i> carpus short, not lobate, enclosed by merus and propodus; propodus linear, palm acute, smooth, without distomedial shelf, without teeth, defined by posteroventral corner with 2 robust setae; dactylus apically subacute. <b>Remarks.</b> See remarks for <i>M. bulowara</i> <b>sp. nov</b>. <b>Distribution.</b> <i>Australia</i>. Victoria: Seal Islands (current study)
description: Published as part of <i>HUGHES, L. E., 2011, New species of Hoho, Mallacoota and Parelasmopus (Maeridae: Amphipoda) from Australian waters, pp. 1-79 in Zootaxa 2955 (1)</i> on page 59, DOI: 10.11646/zootaxa.2955.1.1