Bemlos tridentatus Myers, 1988

Myers, Alan A., 2009, Aoridae *, Zootaxa 2260 (1), pp. 220-278 : 250-251

Bemlos tridentatus Myers, 1988

( Figs 23 , 24 )

Bemlos tridentatus Myers, 1988b: 289 , figs 20–21. — Lowry & Stoddart, 2003: 69 (catalogue).

Material examined. Not collected in the current study.

Type locality. Reef off North Point, Lizard Island, Queensland, Australia (14°40'S 145°28'E) .

Description. Based on holotype, male, 2.8 mm, AM P37426 ( Myers, 1988b).

Head. Head lateral cephalic lobes apically truncate. Antenna 1 flagellum with 10 or less articles; accessory flagellum 3-articulate. Antenna 2 stout, peduncular article 3 swollen, article 4 broad, with few long setae. Lower lip with fine setae and stout setae. Maxilla 1 basal inner plate with 1 long pectinate apical seta. Mandible, palp article 3 longer than 2, posterior margin convex, posterior margin with setae of more than two distinct lengths.

Pereon. Pereonites 3–5 with apically acute sternal spines, Gnathopod 1 enlarged in males only; coxa distinctly produced anterodistally, sub-acute; basis robust, half or more as broad as long, without a posterodistal spine, posterodistal margin with one seta, anterodistal margin with strong flange; ischium anterior margin without flange, posterior margin with one seta; merus not greatly elongated, fused along its entire length with carpus, posterior margin with few setae, without posterodistal spine; carpus 1.3 x length of propodus, anterior margin without spine, posterior margin with 3 stout spines, the distal the largest; propodus anterior margin weakly setiferous, posterior margin straight, palm present, delimited from posterior margin, defined by weak posterodistal spine, with robust seta defining palm, without spine near base of dactylus; dactylus more than half length of propodus, slightly overlapping palm. Gnathopod 2 subchelate; basis anterodistal margin with strong flange produced into an anterodistal lobe, posterodistal margin without robust setae; merus not enlarged or produced away from carpus; carpus subequal with or a little shorter than propodus, anterior margin not lobate, with short sparse setae; propodus with short sparse setae, palm with robust seta defining palm. Pereopod 3 without brush of long setae on merus. Pereopod 6 basis not produced posterodistally. Pereopod 7 significantly greater than 125% length of pereopod 6.

Pleon. Epimeron 3 posterodistal margin rounded. Uropod 1 rami subequal, peduncle much longer than broad, distoventral spine less than half length of peduncle. Uropod 2 biramous; peduncle with distoventral spine, half length of peduncle. Uropod 3 biramous, rami subequal, inner ramus 1.5 x length of peduncle. Telson with distal fine setae only.

Female (sexually dimorphic characters). Based on paratype, female, 2.9 mm, AM P37427 ( Myers 1988b). Sternal spines absent. Gnathopod 1 basis a little more slender than that of male; carpus slender, subequal in length with propodus or one and one third to one and one half length of propodus, posterior margin without spines; propodus subequal in length to carpus, palm defined by rounded corner. Gnathopod 2 basis slender, anterodistal margin without flange .

Habitat. Coral rubble.

Remarks. This species differs from all other Great Barrier Reef species of Bemlos by the tridentate carpus of the male gnathopod 1.

Distribution. Australia., Queensland: off North Point, Lizard Island ( Myers 1988b).

Figures

FIGURE 23. Bemlos tridentatus Myers, 1988b, male, 2.8 mm, AM P37426, North Point, Lizard Island, Great Barrier Reef.

FIGURE 24. Bemlos tridentatus Myers, 1988b, male, 2.8 mm, AM P37426, female, 2.9 mm AM P37427, North Point, Lizard Island, Great Barrier Reef.