Notopoma moorea, Lowry & Berents, 1996

Lowry, J. K. & Berents, Penelope B., 1996, The Ericthonius group, a new perpective on an old problem (Crustacea: Amphipoda: Corophioidea), Records of the Australian Museum 48 (1), pp. 75-109 : 95-99

Notopoma moorea n.sp.

Figs 13-15

Type data. HOLOTYPE, male, 1.80 mm, AM P42279 ; PARATYPE, male, AM P42280 ; PARATYPE, female, 2.0 mm, AM P42281 ; coral slope of exposed fringing reef near Afareaitu , Moorea, Society Islands, French Polynesia, 17°33.7'S 149°56.5'W, dead corals, 1-2 m, H.G. Miiller, 26 March 1988 .

Material described. Based on holotype male, 1.8 mm; dimorphic characters based on paratype female, 2.0 mm.

Diagnosis. Antennae: short, robust. Mandible: palp article 2 short, broad, length 1.8 x breadth, article 3 clavate. Maxilla 1: outer plate with 9 setal-teeth. Gnathopod 2: male propodus very broad, sightly curved, length 2.1 x width. Peraeopod 7: dactylus with one accessory spine. Pleopod 2: biramous, inner ramus vestigial. Pleopod 3: small, uniramous.

Description. Head: rostrum short, straight, apically rounded, length 0.2 x head; lateral cephalic lobe well developed, ventral corner rounded, subocular margin deeply recessed, anteroventral corner subquadrate, ventral margin horizontal, posterior margin vertical. Antenna 1: short, 0.28 x body length, without scales; peduncular article 1 produced dorsodistally and dorsomedially, dorsodistal projection 0.5 along article 2, length 1.9 x peduncular article 3; accessory flagellum absent; flagellum short, 2-articulate (female 2), aesthetascs present along ventral margin, article 1 long, 2.1 x article 2. Antenna 2: subequal in length to antenna 1; peduncle without scales; flagellum 3­ articulate (female 3), article 1 long, 2.6 x article 2.

Epistome and upper lip: fused, produced, subacute. Mandible: left incisor with 4 cusps, right incisor with 5 cusps; left ··lacinia mobilis with 4 cusps, right with one large cusp and minutely serrate margin; left accessory setal row with 3 pappose robust setae, without intermediate plumose setae, right accessory setal row with 2 pappose robust setae, with 2 intermediate plumose setae; molar triturating, palp article 2 short, broad, length 1.8 x breadth, 1 x article 3. Without proximal A2-setae. Without distal A2­ setae, with 4 posterior submarginal A2-setae, with 4 B2-posterior submarginal setae, without D2-setae; article 3 clavate, long, 2.3 x breadth, without proximal A3-setae, without distal A3-setae, without submarginal A3-setae, with 3 posterior submarginal B3-setae, with 7 D3-setae, and 3 E3-setae. Maxilla 1: inner plate small, without setae; outer plate with 9 setal-teeth; right palp with 5 terminal robust setae, without subterminal setae. Maxilla 2: unknown. Maxilliped: unknown.

Peraeonitel: without lateral keel in male. Peraeonite 2: without sternal keel in male. Peraeonite 5: male, length 2 x breadth, female, length 2.1 x breadth. Gnathopod 1: subchelate; coxa not fused to peraeonite 1 in male or female, length 1.9 x depth, without anteroventral lobe; basis in male with sparse setae along anterior margin, in female with sparse setae along anterior margin, without robust setae along anterior margin; carpus length 1 x depth with setose posterior lobe, anterior margin without setae in male and female; propodus length 1.4 x depth, with 5 rows of anteromedial setae; palm acute, sparsely setose, with barbed robust setae. Gnathopod 2: carpochelate in ~ale, subchelate in female; coxa not fused to peraeonite 2 in male or female, length 1.8 x depth, without anteroven~ral lobe; basis short, broad, length 1 x breadth; carpus" massive, long, broad, length 1.1 x breadth, posterior margin without tooth; palm slightly obtuse, palm narrowly excavate, anterodistal tooth large, located near articulation with propodus, posterodistal tooth well defined, medium in size, length 1.5 x width, without robust setae; propodus very broad, slightly curved, length 2.1 x width, without tooth on posterior margin, with smooth posterodistal corner; dactylus, length 0.5 x propodus.

Peraeopod 3: coxa not fused to peraeonite 3 in male or female, length 3 x depth, without anteroventral lobe; basis length 1.5 x breadth, with inflated anterodorsal corner, with setae along anterior margin, without denticles along anterior margin; ischium length 1.5 x breadth; merus without ridges; carpus with 1 simple seta along distal half of anterior margin, without setae along posterior margin; propodus with 3 plumose setae along posterior margin. Peraeopod 4: coxa not fused to peraeonite 4 in male or female, length 1.8 x depth, without anteroventral lobe; basis length 1.5 x breadth, without setal group along anterior margin; ischium long, length 1.5 x breadth; carpus with 2 simple setae along distal half of anterior margin, with 2 simple setae along posterior margin; propodus with 3 simple setae along posterior margin. Peraeopod 5: coxa, length 1.8 x depth, without patches of slIl~11 setae; anterior lobe of merus not extending beyoIld anterior margin of carpus, posterior lobe with. 2 plumose setae; propodus without setae along posterior 111argin, dactylus short, uncinate with two accessory spl1'1es.Peraeopod 6: coxa without setal fringe ventrally, without patch of small setae; basis without anterior setae..With small denticles along posterodistal 椱ㄱ繲杩渮 Merus, length 1.4 x breadth, without small anterodistallobe; carpus without anterodistal lobe, without posterodistal lobe, posterodistal corner bearing small setal bunch; propodus, anterodistal corner bearing small setal bunch; dactylus short, uncinate with two accessory spines. Peraeopod 7: coxa with posterodorsal lobe, with patch of small setae; basis without denticles along anteroproximal margin, with small denticles along posterodistal margin; merus, length 1.7 x breadth, without small anterodistal· lobe, posterodistal corner bearing small setal bunch; carpus without anterodistal lobe, without posterodistal lobe, anterodistal corner bearing small setal bunch; propodus posterodistal corner bearing small bunch of long setae, anterodistal corner bearing small seta; dactylus short, uncinate with one accessory spine.

Oostegites: from gnathopod 2 to peraeopod 5. Gills: from peraeopod 3 to peraeopod 6.

Pleopods 1 to 3: decreasing in size. Pleopod 1: peduncle without patch of small setae, with 2 small distomedial hooks; rami subequal in length; inner ramus without patch of small setae, 5-articulate; outer ramus, article 1 with straight medial margin, 5­ articulate. Pleopod 2: peduncle without patch of small setae, with 2 small distomedial hooks; biramous, inner ramus reduced, without patch of small setae, 1­ articulate, length 0.2 x outer ramus; outer ramus broad, 2-articulate, without patch of small setae. Pleopod 3: peduncle unknown; inner ramus unknown; outer ramus broad, I-articulate, without patch of small setae. Uropod 1: biramous, peduncle with distoventral corona of cuticular teeth, length 1.3 x outer ramus, without distoventral spine; rami with distoventral corona of cuticular teeth outer ramus with lateral row of denticles, with 1 medial seta, with large apical robust seta; inner ramus length 0.5 x outer ramus, without setae, with apical robust seta. Uropod 2: uniramous, peduncle length 2.1 x breadth, 2.5 x ramus; ramus small, with denticles and 1 apical robust seta. Uropod 3: uniramous peduncle length 2.3 x breadth; ramus with 3 curved spines. Telson: length 0.6 x breadth, cleft 0.5 x length, each lobe with 12 to 11 anteriorly directed spines in two rows.

Thbe. Probably without a tube.

Etymology. The name moorea refers to the type locality of the species.

Distribution. Afareaitu, Moorea, Society Islands, French Polynesia, in depths of 1 to 2 m.