Kamakidae * Author Myers, Alan A. text Zootaxa 2009 2009-10-08 2260 1 487 493 https://www.biotaxa.org/Zootaxa/article/view/zootaxa.2260.1.28 journal article 10.11646/zootaxa.2260.1.28 1175-5326 10093499 Gammaropsella saepta sp. nov. ( Figs 1 , 2 ) Type Material. Holotype , male, 2.7 mm , AM P71483, Yonge Reef , Half Mile Opening , Lizard Island ( 14 o 34’19”S 145 o 36’51”E ), Halimeda opuntia (green coralline alga), 10 m , I. Takeuchi , R . T . Springthorpe & O. Coleman , 5 March 2005 (QLD 1823) . Paratypes : 5 females , same data as holotype, AM P71483 (QLD 1823) . Additional material examined. 2 females , AM P71404 (QLD 1806) ; 1 female , AM P71512 (QLD 1829) ; 4 females , AM P71573 (QLD 1829) . FIGURE 1. Gammaropsella saepta sp. nov. , holotype, male, 2.7 mm, AM P71483, Yonge Reef, Half Mile Opening, Great Barrier Reef. FIGURE 2. Gammaropsella saepta sp. nov. , holotype, male, 2.7 mm, paratype, female 2.6 mm, AM P71483, Yonge Reef, Half Mile Opening, Great Barrier Reef. Type locality. Yonge Reef , Half Mile Opening , Lizard Island , Queensland , Australia ( 14 o 34’19”S 145 o 36’51”E ). Etymology. From the Latin saeptum meaning ‘barrier’ pertaining to the Great Barrier Reef. Description. Based on holotype , male, 2.7 mm , AM P71483. Head. Head lateral cephalic lobe very extended; eye situated entirely within lobe. Antennae slender. Antenna 1 only a little shorter than body length; peduncular article 3 longer than article 2; flagellum with 11 articles; accessory flagellum with 3 articles. Antenna 2 a little shorter than antenna 1; peduncular articles 4 and 5 very slender, unornamented; flagellum with 7 articles. Mandible palp article 3 shorter than article 2, not expanded distally, setae on distal portion of posterior margin. Pereon. Gnathopod 1 subchelate; coxa 1 subequal with coxa 2; carpus and propodus subequal. Gnathopod 2 subchelate; carpus a little shorter than propodus; propodus palm oblique without excavation or spine; dactylus weakly overlapping palm. Pereopod 4 coxa without posteroventral lobe. Pereopods 5–7 basis evenly weakly expanded, posterior margin weakly convex. Pleon. Epimeron 3 posteroventral corner rounded. Urosomites 1–2 not coalesced. Urosomite 3 not coalesced with telson. Uropods 1–2 peduncle with distoventral spine; inner rami with marginal robust setae. Uropod 2 inner ramus longer than outer ramus. Uropod 3 biramous; peduncle a little shorter than rami; rami subequal in length; outer ramus with small second article. Female (sexual dimorphic characters). Based on paratype , female 2.6 mm , AM P71483. Gnathopod 2 propodus a little longer than carpus . Habitat. Among coralline algae on reef. Remarks. This species differs from the two other described species in the genus, Gammaropsella simplex Myers, 1995 and G. pilosa Myers, 1995 , in having a distoventral spine on the uropod 2 peduncle. It most closely resembles G. simplex Myers, 1995 , from Papua New Guinea , but the male gnathopod 2 is even less enlarged than in that species. It also differs from G. simplex in its multi-articulate accessory flagellum and unenlarged male coxa 2. Distribution. Australia . Queensland : Lizard Island (current study).