Globosolembos excavatus ( Myers, 1975 )

Myers, Alan A., 2009, Aoridae *, Zootaxa 2260 (1), pp. 220-278 : 258-260

Globosolembos excavatus ( Myers, 1975)

( Figs 29 , 30 )

Lembos excavatus Myers, 1975: 32 , figs 76–82. —Ledoyer, 1982: 218, figs 104–105 (in part).

Lembos processifer . — Ledoyer, 1984: 35 (in part), fig. 16 (“forme 2”) (not L. processifer Pirlot, 1938 , 330, figs 147–149.

Lembos (Globosolembos) excavatus . — Myers, 1985a: 363, fig. 234.

Globosolembos excavatus . — Myers, 1986: 285, figs 11–12. — Myers, 1988b: 329. — Myers, 1998. 195. — Appadoo & Myers, 2004, 353. — Myers, 2005, 358. — Lowry & Stoddart, 2003: 69 (catalogue).

Material examined. 1 juvenile male, AM P71202 (QLD 1747) ; 5 males, 1 female, AM P28862 (QLD 2009) .

Type locality. Watamu Bay , Kenya (~ 3°23'S 39°59'E) .

Description. Based on male, 3.0 mm, AM P28862.

Head. Head lateral cephalic lobes apically truncate. Antenna 1 flagellum with less than 20 articles. Antenna 2 with few long setae. Labium with fine setae and stout setae. Maxilla 1 inner plate with 1 long pectinate apical seta. Mandible, palp article 3 longer than 2, posterior margin weakly falcate, posterior margin with setae of more than two distinct lengths.

Pereon. Pereonites 2–4 with apically sub-acute or rounded sternal spines. Gnathopod 1 enlarged in both sexes; coxa unproduced anterodistally; basis robust, half or more as broad as long, posterodistal margin without setae, anterodistal margin with strong flange; ischium anterior margin without flange; merus fused along its entire length with carpus, posterior margin without posterodistal spine; carpus one third length of propodus, anterior margin without spine, posterior margin without spines; propodus anterior margin moderately setiferous, posterior margin weakly convex, palm present, delimited from posterior margin, margin forming a broad excavate sinus, robust seta defining palm, without spine near base of dactylus; dactylus about half length of propodus, fitting palm. Gnathopod 2 subchelate; basis anterodistal margin with weak flange, posterodistal margin without robust setae; with few setae along its length; merus not enlarged or produced away from carpus; carpus longer than propodus, anterior margin with long dense setae; propodus anterior margin with long dense 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 less than 125% length of pereopod 6.

Pleon. Epimeron 3 posterodistal margin rounded. Uropod 1 rami subequal, peduncle much longer than broad, distoventral spine one third length of peduncle. Uropod 2 biramous; peduncle with distoventral spine one half length of peduncle. Uropod 3 biramous, rami distinctly unequal, inner ramus 1.5 x length of peduncle; outer ramus lacking second article. Telson with distal fine setae only.

Female (sexually dimorphic characters). Based on female, 3.0 mm, AM P28862. Sternal spines absent. Gnathopod 1 carpus a little over one half length of propodus; propodus with palm defined by a small spine and a robust seta. Gnathopod 2 basis anterodistal margin without flange; carpus shorter than propodus, with short sparse setae; propodus with long setae, less dense that those of male.

Habitat. Coral rubble.

Remarks. Globosolembos excavatus differs from other Globosolembos species on the Great Barrier Reef by the broad excavate sinus on the posterior margin of the male gnathopod 1.

Distribution. Australia. Queensland: Lizard Island ( Myers 1985a; 1988b, current study); Heron Island ( Myers 1985 a, 1988b). East Africa. Tanzania: Kenya ( Myers 1975 b). Madagascar. Tulear (Ledoyer 1982). Mauritius ( Appadoo & Myers 2004). New Caledonia. Noumea ( Ledoyer 1984; Myers 1998). Rodrigues ( Myers 2004). Society Islands. Austral Isles ( Myers 2005). Tonga ( Myers 1985a).

Figures

FIGURE 29. Globosolembos excavatus (Myers, 1975), male, 3.0 mm, AM P28862, Heron Island, Great Barrier Reef.

FIGURE 30. Globosolembos excavatus (Myers, 1975), male, 3.0 mm, female, 3.0 mm, AM P28862, Heron Island, Great Barrier Reef.