Bemlos triangulum Myers, 1988

Myers, Alan A., 2009, Aoridae *, Zootaxa 2260 (1), pp. 220-278 : 247-250

Bemlos triangulum Myers, 1988

( Figs 21 , 22 )

Bemlos triangulum Myers, 1988b: 291 , figs 22–23. — Lowry & Stoddart, 2003: 69 (catalogue).

Material examined. Not collected in the current study.

Type locality. Sandbank Reef , northern Queensland, Australia (13°45'S 144°16'E) .

Description. Based on holotype, male, 4.0 mm, AM P37428.

Head. Head lateral cephalic lobes apically truncate. Antenna 1 and Antenna 2 unknown. 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 weakly convex, with setae of more than two distinct lengths.

Pereon. Pereonites 2–4 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 anterodistal spine, posterodistal margin with 1 seta, anterodistal margin with strong flange; ischium anterior margin without flange, posterior margin with few setae; merus not greatly elongated, fused along its entire length with carpus, posterior margin with few setae, without posterodistal spine; carpus one and one third to one and one half length of propodus, with very few setae; anterior margin without spine; propodus anterior margin weakly setiferous, posterior margin straight or weakly concave, palm present, palm delimited from posterior margin, defined by strong posterodistal spine, without robust seta defining palm, without spine near base of dactylus; dactylus about half length of propodus, significantly overlapping palm. Gnathopod 2 subchelate; basis anterodistal margin without flange, posterodistal margin without robust setae; with few setae along its length; merus not enlarged or produced away from carpus; carpus subequal with propodus, anterior margin not lobate; propodus with short dense setae, palm with robust seta defining palm. Pereopod 3 without brush of long setae on merus.

Pleon. Epimeron 3 posterodistal margin produced into a small spine. Uropod 1 rami subequal, peduncle much longer than broad, distoventral spine less than half length of peduncle. Uropod 2 biramous; peduncle without distoventral spine. Uropod 3 biramous, rami subequal, inner ramus a little longer than peduncle.

Female (sexually dimorphic characters). Based on paratype female 4.0 mm, AM P37429 ( Myers, 1988b). Sternal spines absent. Gnathopod 1 coxa slightly produced anterodistally; carpus subequal in length with propodus; palm defined by oblique corner, with robust seta defining palm .

Habitat. Coral rubble.

Remarks. This species is superficially similar to B. australis , but is a smaller species with a number of significant differences. The male gnathopod 1 coxa is sub-acute (rounded in B. australis ), uropod 2 peduncle lacks an distoventral spine (well developed in B. australis ) and sternal processes are present on segments 2–4 of the male (absent in B. australis ).

Distribution. Australia. Queensland: Sandbank Reef ( Myers 1988b).

Figures

FIGURE 21. Bemlos triangulum Myers, 1988b, male, 4.0 mm, AM P37428, Sandbank Reef, north Queensland, female, 4.0 mm, AM P37429, Sandbank Reef, north Queensland.

FIGURE 22. Bemlos triangulum Myers, 1988b, male, 4.0 mm, AM P37428, Sandbank Reef.