Paradexamine micronesicus Ledoyer, 1979

Myers, Alan A., 2009, Dexaminidae *, Zootaxa 2260 (1), pp. 393-424 : 413-414

Paradexamine micronesicus Ledoyer, 1979

( Figs 15 , 16 )

Paradexamine micronesicus Ledoyer, 1979: 56 , fig. 30 (II). — Ledoyer, 1983: 374, fig. 140.

Dexaminoides orientalis . —J.L. Barnard, 1965: 523, fig. 25.

Material examined. 1 female, AM P78003 ( QLD 1621 ) ; 1 male, AM P70749 ( QLD 1647 ) ; 1 juvenile, AM P70793 ( QLD 1649 ) ; 2 females, AM P78005 ( SEL /LZI-1-1) .

Type Locality. Toliara (Tulear), Madagascar (~ 23°25'S 43°42'E) .

Description. Based on female, 2.8 mm, AM P70637.

Head. Head lateral lobes acute. Eye large, about half or less length of head, with black central core. Antenna 1 peduncle article 1 with posterodistal acute spine. Antenna 2 length unknown; peduncle article 4 slender, parallel sided, weakly setulose; flagellum unknown. Maxilliped palp 4-articulate.

Pereon. Gnathopod 1 carpus longer than propodus; propodus not greatly expanded distally. Gnathopod 2 carpus elongate, slender, much longer than propodus. Pereopods 3–7 simple or scarcely prehensile. Pereopod 3 coxa, posterodistal corner with single spine; dactylus much less than half length of propodus. Pereopods 5– 7 of uniform morphology. Pereopod 5 basis subrectangular, with posterodistal lobe, anterior margin without robust setae. Pereopod 6 basis pyriform, broadest proximally, posteroproximal margin convex, serrated, posterodistal margin straight, smooth. Pereopod 7 coxal gill present; basis moderately expanded, longer than broad, posterodistal margin serrated.

Pleon. Segments with the following dorsal spine arrangement (from urosomite 1 forwards): 1.3.3.1.0. Epimeron 2 posteroventral corner produced into a small spine. Epimeron 3 posterior and ventral margins smooth, with a single strong posteroventral spine. Urosome with urosomites 2–3 fused. Urosomite 1 with dorsal spine only. Uropod 3 rami lacking long fine setae. Telson lobes distally serrated, each lobe with multiple serrations of uneven size and shape, without distal spine, without subdistal robust seta, without subdistal slender seta.

Male (sexually dimorphic characters). Based on male, 2.8 mm, AM P70749. Eye huge, more than half length of head. Antenna 2 peduncle article 4 broader proximally, finely setulose. Uropod 3 rami with many long fine setae .

Habitat. Sandy bottoms with mounds of Udotea and coral rubble.

Remarks. Present material agrees well with the original description ( Ledoyer 1979).

Distribution. Australia. Queensland: Lizard Island (current study). Madagascar. Toliara (Tulear) ( Ledoyer 1979). Micronesia. Ifaluk Atoll ( Barnard 1965).

Figures

FIGURE 15. Paradexamine micronesicus Ledoyer, 1979, female, 2.8 mm, AM P70637, Palfrey Island, Lizard Island, Great Barrier Reef.

FIGURE 16. Paradexamine micronesicus Ledoyer, 1979, female, 2.8 mm, AM P70637, Palfrey Island, Lizard Island; male, 2.8 mm, AM P70749, Watson's Bay, Lizard Island, Great Barrier Reef.