Gammaropsella saepta, Myers, 2009

Myers, Alan A., 2009, Kamakidae *, Zootaxa 2260 (1), pp. 487-493 : 488-490

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) .

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).

Figures

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.