Cymadusa smilodonta Hughes &amp; Lowry 2009, sp. nov.
Creators: name: Hughes, L. E.
name: Lowry, J. K.
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Ampithoidae
Cymadusa
Cymadusa smilodonta

description: <i>Cymadusa smilodonta</i> Hughes &amp; Lowry sp. nov. (Figs 25, 26) <b>Type material.</b> Holotype, male, 7.9 mm, 4 slides, AM P76772, south end of Yonge Reef, Yonge Reef (14°36.954’S 145°37.184’E), filamentous red algae, back reef, 7 m, L. Hughes, 3 March 2005 (QLD 1799). Paratypes: female, 7.5 mm, 4 slides, AM P76773 (QLD 1799); 8 unsexed, AM P71367 (QLD 1799). <b>Additional material examined.</b> 1 unsexed, AM P76774 (QLD 1916); many unsexed, AM P76775 (QLD 1948). <b>Type locality.</b> South end of Yonge Reef, Yonge Reef, near Lizard Island, Queensland, Australia (14°36.954’S 145°37.184’E), filamentous red algae, back reef, 7 m depth. <b>Etymology.</b> Named derived from the sabre-toothed cat genus <i>Smilodon – greek</i> ‘knife tooth’, referring to the large “tooth” projecting from the male gnathopod two. <b>Description</b>. Based on holotype, male, 7.9 mm, AM P76772. <b>Head.</b> <i>Head</i> as long as deep. <i>Antenna 1</i> slightly longer than antenna 2; peduncular article 1 subequal to article 2; primary flagellum 19 articles; accessory flagellum absent. <i>Antenna 2</i> peduncle not densely setose on ventral margin; article 4 longer than article 5; flagellum 14 articles. <i>Upper Lip</i> lateral margins each with midlateral notch. <i>Mandible</i> molar well developed, triturating, accessory setal row with 10 serrate setae; palp 3–articulate, apically setose; article 1 shorter than article 2; article 2 shorter than article 3, slender setae present; article 3 longer than article 1. <i>Lower lip</i> outer plates notched, forming a medial excavation, lateral lobe distinctly longer than medial lobe; mandibular lobe with curved margins, subacute apically. <i>Maxilla 1</i> inner plate with 4 setae; palp article 2 broad. <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> longer than gnathopod 2; coxa distinctly larger than coxa 2, anteriorly produced, anterior margin convex, anteroventral corner rounded, with a tuft of slender setae in the posteroventral corner; basis longer than coxa, anterodistal lobe rounded, without setae; merus posterodistal lobe acute; carpus about 2 x as long as broad, subequal in length to propodus, anterior margin with slender setae, posterior margin straight; propodus broad, subrectangular; palm acute, sinusoidal, with posterodistal corner subquadrate, with 1 robust seta defining palm; dactylus overreaching palm, inner margin crenate. <i>Gnathopod 2</i> coxa with a tuft of slender setae in the posteroventral corner; basis with fringe of long, slender setae, with large rounded anterodistal lobe, without setae; merus margin without lobe; carpus much shorter than propodus, cup-shaped, anterior margin with 7 robust setae; propodus broad, less than 1.5 x as long as broad; palm acute, excavate, with proximal, columnar subquadrate projection near base of dactylus, with posterodistal corner, subquadrate, without palm defining robust setae; dactylus much shorter than palm, not tapering, apically blunt, unguis minute, inner margin crenate. <i>Pereopods 3–4</i> basis narrow; merus subequal in length to carpus. <i>Pereopods 5–7</i> simple. <i>Pereopod 5</i> without medial slender setae; distal articles slender; propodus not expanded distally, without 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, without 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 broadly rounded. <i>Uropod 1</i> peduncle with 4 robust setae, without fringe of slender setae, with large, acute distoventral spine; outer ramus length about 5–6 x as long as broad, with 6 lateral robust setae; inner ramus with 6 lateral setae. <i>Uropod 2</i> peduncle with 5 robust setae; outer ramus with 9 lateral robust setae; inner ramus with 11 lateral robust setae. <i>Uropod 3</i> peduncle longer than broad, more than 2 x length of rami, without marginal slender setae, with 4 distal peduncular robust setae, with 1 distal slender seta; outer ramus with 2 large recurved distal robust setae, with 1 lateral robust seta and 2 lateral slender setae; inner ramus without distal slender setae, with 2 lateral robust setae. <i>Telson</i> subtrapezoidal, apically rounded, with small apical cusp on each distolateral corner, with 3 pair of apical slender setae, and with 2 pair of lateral and 1 pair of apical plumose setae. <b>Female</b> (sexually dimorphic characters). Based on paratype, female, 7.5 mm, AM P76773. <i>Gnathopod 1</i> subequal in size to gnathopod 2; coxa anterior margin concave; basis shorter than coxa; merus anterodistal lobe acute; merus anterodistal lobe truncate; carpus posterior margin convex; propodus palm convex, with rounded corner. <i>Gnathopod 2</i> basis without anterodistal lobe; carpus shorter than propodus, subtriangular; propodus palm straight, posterodistal corner rounded, with 1 robust seta defining palm; dactylus subequal in length to palm, tapering evenly, apically acute. <b>Habitat.</b> Filamentous red algae. <b>Remarks.</b> <i>Cymadusa smilodonta</i> <b>sp. nov.</b> is similar to the Andaman Sea species, <i>C. chalongana</i> Peart 2002. However <i>C. smilodonta</i> has no accessory flagellum (an unusual characteristic in <i>Cymadusa</i>), a setose anterior margin on the carpus, and a better developed excavation in the palm of male gnathopod 2. The male gnathopod 2 palmar projection is in a similar proximal position in both species, but it is columnar and subquadrate in <i>C. smilodonta</i> and apically rounded and shorter in <i>C. chalongana</i>. See remarks under <i>C. khbarnardi</i> for comparison of other GBR species. <b>Distribution.</b> <i>Australia</i>. Queensland: Torres Strait (current study); Lizard Island (current study); One Tree Island (current study).
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 194-198, DOI: 10.11646/zootaxa.2260.1.8, http://zenodo.org/record/5322208
description: {"references": ["Peart, R. A. (2002) New species of Ampithoidae (Crustacea, Amphipoda, Corophioidea) from the eastern Andaman Sea. Phuket Marine Biological Center Special Publication, 23 (1), 229 - 252."]}