Cymadusa tattersalli Peart 2004
Creators: name: Hughes, L. E.
name: Lowry, J. K.
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Ampithoidae
Cymadusa
Cymadusa tattersalli

description: <i>Cymadusa tattersalli</i> Peart, 2004 (Figs 27, 28) <i>Cymadusa setosa</i>. — Tattersall, 1922: 19, figs. <i>Cymadusa filosa</i>. — Ledoyer, 1983: 130, figs. 44–45 (form A). <i>Cymadusa tattersalli</i> Peart, 2004: 314, figs 8–11. — Peart, 2007a: 33, figs 27–28. <b>Material examined.</b> 4 unsexed, AM P61927 (QLD 1342). <b>Type locality</b>. Woodman Point, Cockburn Sound, Western Australia, Australia (~ 32°9’S 115°46’E). <b>Description.</b> Based on male, 11 mm, AM P61927. <b>Head.</b> <i>Head</i> as long as deep. <i>Antenna 1</i> subequal to antenna 2; peduncular article 1 subequal to article 2; primary flagellum 38 articles; accessory flagellum with 2 articles. <i>Antenna 2</i> peduncle with short, dense slender setae on ventral margin; article 4 subequal in length to article 5; flagellum 35 articles. <i>Upper lip</i> directed nearly straight down, lateral margins each with midlateral notch. <i>Mandible</i> molar well developed, triturating, accessory setal row with 7 serrate setae; palp 3–articulate, marginally setose; article 1 shorter than article 2; article 2 subequal in length to article 3, slender setae present. <i>Lower lip</i> outer plates notched, forming a medial excavation, lateral lobe distinctly longer than medial lobe; mandibular lobe with curved margins, rounded apically. <i>Maxilla 1</i> inner plate with 7 setae; palp article 2 broad. <i>Maxilla 2</i> inner plate narrower than outer plate. <i>Maxilliped</i> outer plate with row of large robust setae along medial margin. <b>Pereon.</b> <i>Coxae 1–4</i> deeper than broad. <i>Gnathopod 1</i> smaller than gnathopod 2, margins lined with long slender setae; coxa distinctly larger than coxa 2, anteroventrally produced, anterior margin straight, anteroventral corner rounded, with long setal fringe on ventral margin; basis shorter than coxa, anterodistal lobe absent; merus posterodistal lobe subacute; carpus about 1.75 x as long as broad, longer than propodus, anterior margin with slender setae, posterior margin truncated; propodus broad, subovoid, anterior margin with fringe of long slender setae; palm acute, convex, with rounded posterodistal corner, with 1 robust seta defining palm; dactylus subequal in length to palm, inner margin crenate. <i>Gnathopod 2</i> coxa with long, plumose setal fringe on ventral margin; basis with fringe of long, slender setae; merus margin with short, subacute distal lobe; carpus shorter than propodus, subtriangular; propodus broad, less than 1.5 x as long as broad, subovoid, not produced into an anterodistally setose lobe; palm acute, entire, with proximal broad subquadrate projection near base of dactylus, with short (length 1 x breadth) posterodistal tooth, apically subacute, without palm defining robust setae; dactylus shorter than palm, tapering evenly, apically acute, inner margin crenate. <i>Pereopods 3–4</i> basis slightly expanded; merus subequal in length to carpus. <i>Pereopods 5–7</i> weakly prehensile. <i>Pereopod 5</i> with medial slender setae; distal articles slender; propodus not expanded distally, with 3 anterodistal striated robust setae; dactylus slightly curved. <i>Pereopod 6</i> basis posterior margin straight, with several marginal robust setae; distal articles slender; propodus not expanded distally, with 3 anterodistal striated robust setae; dactylus slightly curved. <i>Pereopod 7</i> similar to pereopod 6. <b>Pleon.</b> <i>Epimera 2–3</i> posteroventral corner with small acute cusp. <i>Uropod 1</i> peduncle with 12 robust setae, with short fringe of slender setae (less than 0.5 x length of peduncle), with large, acute distoventral spine; outer ramus with 11 lateral setae; inner ramus with 10 lateral robust setae. <i>Uropod 2</i> peduncle with 5 robust setae; outer ramus with 9 lateral robust setae; inner ramus with 10 lateral robust setae. <i>Uropod 3</i> peduncle longer than broad, more than 2 x length of rami, marginal slender setae rounded, with 7 distal peduncular robust setae, with 4 slender setae; outer ramus with 2 large recurved distal robust setae, with 1 lateral robust seta and 4 lateral slender setae; inner ramus with 8 distal slender setae, with 2 lateral robust setae. <i>Telson</i> subrectangular, apically truncated, with small apical cusp on each distolateral corner, with more than 8 pairs of oblique slender setae. <b>Female</b> (sexually dimorphic characters). Based on paratype, female, 12 mm, AM P61927. <i>Gnathopod 1</i> subequal in size to gnathopod 2; coxa subequal to coxa 2; basis anterodistal lobe with 1 slender seta; carpus about 2 x as long as broad, subequal in length to propodus, anterior margin without setae, posterior margin truncated; palm convex, posterodistal corner rounded. <i>Gnathopod 2</i> coxa with ventral row of slender setae of varying lengths; basis rounded anterodistal lobe, anterodistal corner without setae; palm with posterodistal corner, rounded, with 1 robust seta defining palm; dactylus subequal in length to palm. <b>Habitat.</b> Brown algae. <b>Remarks.</b> <i>Cymadusa tattersalli</i> is closely related to <i>Cymadusa setosa</i> (Haswell, 1879) and <i>Cymadusa filosa</i> Savigny, 1816. According to Peart (2004) <i>C. tattersalli</i> differs from both species in the gnathopod 1 merus which is produced to form a small, subacute or rounded anteroventral lobe (short and acute in <i>C. filosa</i> and <i>C. setosa</i>) and the carpus which is short and robust (elongate and narrow in <i>C. filosa</i> and <i>C. setosa</i>). <i>Cymadusa tattersalli</i> is distinct from all other GBR ampithoids, except <i>C. wistari</i>, because of the dense plumose setae lining the margins of gnathopods 1 and 2 and pereopods 3 and 4. <i>Cymadusa tattersalli</i> has a sculptured palm on the propodus of gnathopod 2, which is entire in <i>C. wistari</i>. <b>Distribution.</b> <i>Australia</i>. Queensland: Heron Island (Peart 2007a). Western Australia: Cockburn Sound; Abrolhos Islands; Dampier Archipelago (Peart 2007a). <i>Madagascar</i> (Ledoyer 1983).
description: Published as part of <i>Hughes, L. E. &amp; Lowry, J. K., 2009, Ampithoidae *, pp. 153-219 in Zootaxa 2260 (1)</i> on pages 198-201, DOI: 10.11646/zootaxa.2260.1.8, http://zenodo.org/record/5322208
description: {"references": ["Peart, R. A. (2004) A revision of the Cymadusa filosa complex (Crustacea: Amphipoda: Corophioidea: Ampithoidae). Journal of Natural History, 38 (3), 301 - 336.", "Tattersall, W. M. (1922) Amphipoda and Isopoda. The Percy Sladen Trust Expeditions to the Abrolhos Islands (Indian Ocean). Journal of the Linnean Society of London, Zoology 35, 1 - 19, pls 1 - 3.", "Ledoyer, M. (1983) Crustaces amphipodes gammariens. Familles des Acanthonotozomatidae a Gammaridae. Faune de Madagascar, 59 (1), 1 - 598.", "Peart, R. A. (2007 a) A review of Australian Cymadusa (Crustacea: Amphipoda: Ampithoidae) with descriptions of eight new species. Zootaxa, 1540, 1 - 53.", "Haswell, W. A. (1879) On Australian Amphipoda. Proceedings of the Linnean Society of New South Wales, 4 (3), 245 - 79, pls 7 - 12.", "Savigny, J. - C. (1816) Observations generales sur la bouche des arachnidesdes crustaces et des entomostraces. pp. 39 - 117 in Memories sur les Animaux sans Vertebres, Premiere partie. Deterville, Paris"]}