Ampithoidae * Author Hughes, L. E. Author Lowry, J. K. text Zootaxa 2009 2009-10-08 2260 1 153 219 https://www.biotaxa.org/Zootaxa/article/view/zootaxa.2260.1.8 journal article 10.11646/zootaxa.2260.1.8 1175-5326 5322208 Cymadusa hoeyae Hughes & Lowry sp. nov. ( Figs 17 , 18 ) Type material. Holotype , male, 7.5 mm , 1 slide, AM P76761 . Paratype , female, 4 unsexed, AM P71037 , Picnic Beach , Palfrey Island , near Lizard Island ( 14°41.69’S 145°26.89’E ), algal mat and fine sediment from rubble bottom, reef flat, 3 m , S. LeCroy , 27 February 2005 ( QLD 1708 ) . Additional material examined. 1 dissected male, AM P76764 ( QLD 1704); 1 dissected female, AM P76763 ( QLD 1704); 1 unsexed, AM P76765 ( QLD 1704); 1 unsexed, AM P76766 ( QLD 1730); 5 unsexed, AM P76762 ( QLD 1757). Type locality. Picnic Beach , Palfrey Island , near Lizard Island , Queensland , Australia ( 14°41.69’S 145°26.89’E ), living on the reef flat in algal mats and fine sediment from rubble bottoms, 3 m . Etymology. Named for Jessica Hoey (GBRMPA), in appreciation for her help in the organisation of our collecting permits for the GBR project. Description. Based on holotype , male, 7.5 mm , AM P76761. Head. Antenna 1 shorter than antenna 2; peduncular article 1 subequal to article 2; flagellum 19 articles; accessory flagellum with 1 article. Upper lip lateral margins each with midlateral notch. Mandible molar well developed, triturating, accessory setal row with 8 serrate setae; palp 3–articulate, article 3 apically setose; article 1 shorter than article 2; article 2 shorter than article 3; article 3 longer than article 1. Lower lip outer plates notched, forming medial excavation, lateral lobe distinctly longer than medial lobe; mandibular lobe with curved margins, rounded apically. Maxilla 1 inner plate with 3 setae; palp article 2 broad. Maxilla 2 inner plate narrower than outer plate. Maxilliped outer plate with row of large robust setae along medial margin. FIGURE 17. Cymadusa hoeyae Hughes & Lowry sp. nov. , holotype, male, 7.5 mm, AM P76761, Palfrey Island, Great Barrier Reef. FIGURE 18. Cymadusa hoeyae Hughes & Lowry sp. nov. , holotype, male, 7.5 mm, AM P76761, Palfrey Island, Great Barrier Reef. Pereon. Coxae 1–4 deeper than broad. Gnathopod 1 longer than gnathopod 2; coxa distinctly larger than coxa 2, produced, anterior margin straight, anteroventral corner rounded, with a tuft of long or short slender setae in the posteroventral corner; basis longer than coxa, anterodistal lobe absent, with 1 slender seta; merus posterodistal lobe subacute; carpus about 3 x as long as broad, longer and more narrow than propodus, anterior margin without setae, posterior margin straight; propodus broad, subovoid; palm acute, convex, with rounded posterodistal corner, with 1 robust seta defining palm; dactylus subequal in length to palm, inner margin crenate. Gnathopod 2 , coxa with a tuft of slender setae in the posteroventral corner; basis with sparse slender setae, anterodistal corner without setae; merus margin with short, subacute anterodistal lobe; carpus shorter than propodus, cup-shaped; propodus broad, less than 1.5 x as long as broad, subrectangular, not produced into an anterodistally setose lobe; palm acute, sinusoidal, 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 simple. Pereopod 5 without medial slender setae; distal articles slender; propodus not expanded distally, without anterodistal striated robust setae; dactylus strongly curved. Pereopod 6 basis posterior margin straight, with several marginal robust setae; distal articles slender; propodus not expanded distally, without anterodistal striated robust setae; dactylus strongly curved. Pereopod 7 similar to pereopod 6. Pleon. Epimera 2–3 posteroventral corner with small acute cusp. Uropod 1 peduncle with 8 robust setae, without fringe of long slender setae, with large, acute distoventral spine (half the length of outer ramus); outer ramus length about 5–6 x as long as broad, with 9 lateral robust setae; inner ramus with 9 marginal robust setae;. Uropod 2 peduncle with 4 robust setae; outer ramus with 7 lateral robust setae; inner ramus with 9 lateral robust setae. Uropod 3 peduncle longer than broad, less than 2 x length of rami, without marginal slender setae, with 5 distal robust and 2 distal slender setae; outer ramus with 2 large recurved distal robust setae, with 1 lateral robust seta and 3 lateral slender setae; inner ramus with 3 distal slender setae, with 1 lateral robust seta. Telson subtrapezoidal, apically rounded, with small apical cusp on each distolateral corner, with 2 oblique medial slender setae, with 1 pair of lateral setae, and with 2 pair of lateral and 1 pair of apical plumose setae. Habitat. Algal mat and fine sediment from rubble bottom. Remarks. Cymadusa hoeyae sp. nov. belongs to a group of six species with an elongate rectolinear carpus on gnathopod 1 of males and includes: C. brevidactyla ( Chevreux, 1907 ) ; C. cavimana ( Sivaprakasam, 1971 ) ; C. filosa Savigny, 1816 ; C. khbarnardi sp. nov. and C. setosa ( Haswell, 1879 ) . Cymadusa filosa and C. setosa are distinguished from other members of the group by the densely plumose setae of their gnathopods and from Cymadusa brevidactyla , C. cavimana and C. khbarnardi sp. nov. by the large excavation on the palm of the male gnathopod 2. The sinusoidal palm of the male gnathopod 2 and lack of dense plumose setae along the margins of the gnathopods distinguishes Cymadusa hoeyae from these and all other GBR species. Distribution. Australia . Queensland : Lizard Island (current study).