Ampithoe cookana Peart 2007, sp. nov.
Creators: name: Peart, Rachael A.
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Ampithoidae
Ampithoe
Ampithoe cookana

description: <i>Ampithoe cookana</i> sp. nov. (Figs. 7–10) <b>Type material</b>. Holotype: AM P61832, male, 6 mm, north ledge, Cook Island, NSW, 28°11.44’S 153°34.67’E, 8 Jun 1983, 12 m, on <i>Chlorodesmis</i> sp., E. Ho &amp; K. Attwood. Paratype: AM P61833, female, 8 mm, type locality. <b>Diagnosis</b>. Antenna 2 slender, similar to antenna 1, with short, dense setae on ventral margin. Lower lip with lateral lobe longer than medial lobe. Maxilla 1 inner plate with 6 slender setae. Gnathopod 1 carpal lobe truncated; carpus shorter than propodus; palm convex, without midmedial tooth, without posterodistal tooth defining palm; dactylus subequal in length to palm. Gnathopod 2 without densely setose margins; basis posterodistal lobe large and rounded, with three slender setae; carpus shorter than propodus; palm acute, excavate, without midmedial tooth, with small subacute posterodistal tooth defining palm, without defining robust setae; dactylus subequal in length to palm. Pereopod 3 basis expanded; merus narrow. Pereopods 5–7 simple. Pereopod 5 merus subrectangular. Uropod 3 peduncle with 5 distal robust setae, outer ramus shorter than inner ramus, without patch of small conical lateral denticles, without lateral setal fringe; inner ramus with 3 distal robust setae. Telson distally truncate, apical cusps small. <b>Description</b>. Based on holotype male, 6 mm, AM P61832. <i>Head</i> as long as deep. <i>Mandible</i> molar with 5 or 6 robust setae in the accessory setal row; palp stout, long, setose along posterior margin, article 1 shorter than article 2 (0.34 x), article 2 longer than article 3 (1.16 x), article 3 longer than article 1 (2.53 x). <i>Lower lip</i> mandibular lobe with curved margins, subacute apically. <i>Maxilla 1</i> palp with apical robust setae. <i>Maxilla 2</i> inner plate narrow, outer plate broader. <i>Maxilliped</i> outer plate with developed setation (robust setae large). <i>Pereon</i>. <i>Gnathopod 1</i> without densely setose margins; coxa larger than gnathopod 2 coxa, produced distoventrally, distoventral margin rounded, anterior margin straight, ventral margin with a row of small setules along ventral margin; basis shorter than coxa, with sparse (sometimes plumose) slender setae, posterodistal lobe small and rounded, 2 or 3 slender setae; merus produced to form a small, rounded distoventral lobe, anterior margin with setae absent; carpus longer than merus, subtriangular, anterior margin with more than 3 robust setae; propodus narrow (length 1.76 x width), subrectangular; palm with 1 defining robust seta; dactylus inner margin denticulate. <i>Gnathopod 2</i> coxa ventral margin, with a row of small setules; basis shorter than coxa, with sparse slender setae; merus produced to form a short, rounded distoventral lobe, anterior margin with setae absent; carpus longer than merus, subtriangular, anterior margin with more than 4 robust setae; propodus broad (length 1.12 x width), ovoid, not produced into an anterodistally setose lobe; dactylus tapering evenly, acute, inner margin denticulate. <i>Pereopod 5</i> basis with marginal robust setae, with medial slender setae; distal articles slender; propodus not expanded distally, subrectangular, with 4 distal simple striated robust setae; dactylus strongly curved. <i>Pereopod 6</i> basis posterior margin rounded proximally, straight distally, without marginal robust setae, without medial slender setae; merus subrectangular; propodus not expanded distally, with 3 distal simple striated robust setae; dactylus strongly curved. <i>Pereopod 7</i> basis with marginal robust setae, without medial slender setae; propodus defined distally by 3–5 simple robust setae. <i>Pleon</i>. <i>Epimeron 3</i> posteroventral corner broadly rounded. <i>Uropod 1</i> peduncle with more than 5 robust setae, with long setal fringe; inner ramus slightly longer than outer ramus, with more than 5 marginal robust setae, slender setae absent; outer ramus with more than 5 marginal robust setae, slender setae absent. <i>Uropod 2</i> peduncle with 3–5 robust setae, setal fringe absent; inner ramus slightly longer than outer ramus, with more than 5 marginal robust setae, slender setae absent; outer ramus with more than 5 marginal robust setae, slender setae absent. <i>Uropod 3</i> peduncle longer than broad (1.49 x width), long with respect to rami length (2.24 x), marginal robust setae absent, marginal slender setae present, with 3–5 distal slender setae; inner ramus with more than 5 distal slender setae. <i>Telson</i> with apical and lateral slender setae. <b>Female</b> (sexually dimorphic characters). Based on paratype, female, 8 mm, AM P61833. <i>Antenna 1</i> longer than antenna 2; peduncular article 1 subequal in length to article 2 (0.98 x), article 2 longer than article 3 (3.05 x), article 3 shorter than article 1 (0.33 x); primary flagellum with 30 articles; accessory flagellum absent. <i>Atenna 2</i> slender, similar to antenna 1, with short, dense setae on ventral margin; peduncular article 4 subequal in length to article 5; flagellum in complete with 6–10 articles. <i>Gnathopod 1</i> subequal in size to gnathopod 2; coxa subequal in size to gnathopod 2 coxa; basis subequal in length to coxa; merus produced to form a short, subacute distoventral lobe; carpus subequal in length to propodus, anterior margin with slender setae only; palm not defined by robust setae; dactylus overreaching the palm. <i>Gnathopod 2</i> basis posterodistal lobe small and round, with 2 or 3 slender setae; merus produced to form a small, subacute distoventral lobe; carpus anterior margin with 1 robust seta and slender setae; palm entire, without tooth defining palm, defined by 1 robust seta. <b>Etymology</b>. This species name is derived from the name of the type locality, Cook Island. <b>Remarks</b>. <i>Ampithoe cookana</i> <b>sp. nov.</b> resembles <i>A. katae</i> <b>sp. nov.</b> and <i>A. rachanoi</i> Peart, 2002 from Thailand, in having simple pereopods 5–7, an entire gnathopod 1 palm, gnathopod 2 has sparsely setose margins and a palm without a midmedial tooth. Of these species, <i>A. cookana</i> most closely resembles <i>A. katae</i>, differing chiefly in the following features: three slender setae on the gnathopod 2 basal lobe (<i>A. katae</i> has one robust seta on gnathopod 2 basal lobe), 3 or 4 instead of 1 robust setae on the anterior margins of gnathopods 1 and 2 carpus, and the gnathopod 2 propodus bears an anterodistally setose lobe (absent in <i>A. katae</i>) <b>Habitat</b>. <i>Ampithoe cookana</i> occurs in turtle grass, <i>Chlorodesmis</i> sp. at a depth of 12 m. <b>Distribution</b>. Cook Island, New South Wales, Australia.
description: Published as part of <i>Peart, Rachael A., 2007, A review of the Australian species of Ampithoe Leach, 1814 (Crustacea: Amphipoda: Ampithoidae) with descriptions of seventeen new species, pp. 1-95 in Zootaxa 1566 (1)</i> on pages 13-18, DOI: 10.11646/zootaxa.1566.1.1, http://zenodo.org/record/5096061
description: {"references": ["Peart, R. A. (2002) New species of Ampithoidae (Crustacea, Amphipoda, Corophioidea) from the eastern Andaman Sea. In: Bruce, N., Berggren, M., &amp; Bussarawit, S. (Eds.) Proceedings of the International Workshop on the Crustacea of the Andaman Sea. Phuket Marine Biological Center Special Publication, 23 (1), 229 - 252."]}