Cymadusa thagaay Peart, 2007

Hughes, L. E. & Lowry, J. K., 2009, Ampithoidae *, Zootaxa 2260 (1), pp. 153-219 : 201-204

Cymadusa thagaay Peart, 2007

( Figs 29 , 30 )

Cymadusa thagaay Peart, 2007a: 36 , figs 29–32.

Material examined. Holotype, male, AM P62518 ( QLD 1370 ); paratype, female, AM P62519 ( QLD 1371 ).

Type locality. Mangrove Beach , Lizard Island, Great Barrier Reef, Queensland, Australia (14°40.99’S 145°27.63’E), living on Turbinaria sp. and green algae, 3 m.

Description. Based on holotype, male, 4 mm, AM P62518 (QLD 1370).

Head. Head as long as deep. Antenna 1 longer than antenna 2; peduncular article 1 subequal to article 2; flagellum 25 articles; accessory flagellum with 1 article. Antenna 2 peduncle not densely setose on ventral margin; article 4 subequal in length to article 5; flagellum 16 articles. Upper lip directed nearly straight down, lateral margins each with midlateral notch. Mandible molar well developed, triturating, accessory setal row with 5 robust serrate setae; palp 3–articulate, article 3 apically setose; article 1 shorter than article 2; article 2 longer than article 3, slender setae present; article 3 subequal in length to article 1. Lower lip outer plates notched, with deep distal cleft, lateral lobe distinctly longer than medial lobe; mandibular lobe with curved margins, subacute apically. Maxilla 1 inner plate with 1 seta; palp article 2 broad. Maxilla 2 inner and outer plates subequal in width. Maxilliped outer plate with row of large robust setae along medial margin.

Pereon. Coxae 1–4 deeper than broad. Gnathopod 1 smaller than gnathopod 2; coxa subequal to coxa 2, weakly produced anteriorly, anterior margin straight, anteroventral corner acute, with ventral row of slender setae of varying lengths; basis shorter than coxa, anterodistal lobe rounded, without setae; merus posterodistal lobe subacute; carpus shorter than propodus, anterior margin with slender setae, posterior margin subacute; propodus broad, subovoid; palm acute, sinusoidal, posterodistal corner rounded, with 1 robust seta defining palm; dactylus subequal in length to palm, apically acute, inner margin crenate. Gnathopod 2 coxa with ventral row of slender setae of varying lengths; basis with sparse medial slender setae, with rounded anterodistal lobe, with 1 slender seta; merus margin with short, subacute distal lobe; carpus shorter than propodus, subtriangular; propodus broad, less than 1.5 x as long as broad, subovoid, anterior margin with fringe of slender setae; palm acute, concave, with posterodistal corner, subquadrate, with 1 robust seta defining palm; dactylus subequal in length to palm, tapering evenly, apically acute, inner margin crenate. Pereopods 3–4 basis narrow; merus subequal in length to carpus. Pereopods 5–7 weakly prehensile. Pereopod 5 without medial slender setae; distal articles broad; propodus slightly expanded distally, with 2 anterodistal striated robust setae; dactylus strongly curved. Pereopod 6 basis posterior margin straight, with a single marginal robust seta; distal articles slender; propodus not expanded distally, with 2 anterodistal striated robust setae; dactylus slightly curved. Pereopod 7 similar to pereopod 6.

Pleon. Epimera 2–3 posteroventral corner broadly rounded. Uropod 1 peduncle with 8 robust setae, with long fringe of slender setae (greater than 0.5 x length of peduncle), with large, acute distoventral spine; outer ramus with 3 lateral robust setae; inner ramus with 2 lateral robust setae. Uropod 2 peduncle with 3 robust setae; outer ramus with 3 lateral robust setae; inner ramus with 4 lateral robust setae. Uropod 3 peduncle longer than broad, more than 2 x length of rami, without marginal slender setae, with 3 distal peduncular robust setae, with 4 distal slender setae; outer ramus with 2 large recurved distal robust setae, without lateral robust or slender setae; inner ramus with 5 distal slender setae and 2 distal robust setae, without lateral robust setae. Telson subrectangular, apically rounded, with small apical cusp on each distolateral corner, with 2 pair of lateral and 3 pairs of apical slender setae.

Female (sexually dimorphic characters). Based on paratype, female, 4 mm, AM P62519 ( QLD 1371 ). Gnathopod 1 subequal in size to gnathopod 2; merus distal lobe rounded; propodus narrow, subrectangular; palm convex. Gnathopod 2 palm sinusoidal, with posterodistal tooth, short, apically subacute .

Habitat. Red, green and brown algae, Turbinaria sp. and Sargassum sp.

Remarks. See remarks for Cymadusa heronensis .

Distribution. Australia. Queensland: Lizard Island ( Peart 2007a).

Figures

FIGURE 29. Cymadusa thagaay Peart, 2007a, holotype, male, 4 mm, AM P62518, paratype, female, 4 mm, AM P62519, Lizard Island, Great Barrier Reef (based on Peart 2007a).

FIGURE 30. Cymadusa thagaay Peart, 2007a, holotype, male, 4 mm, AM P62518, paratype, female, 4 mm, AM P62519, Lizard Island, Great Barrier Reef (based on Peart 2007a).