Ceradocus hawaiensis J.L. Barnard, 1955

Krapp-Schickel, Traudl, 2009, Maeridae, the Ceradocus group *, Zootaxa 2260 (1), pp. 598-642 : 603-604

Ceradocus hawaiensis J.L. Barnard, 1955

( Fig. 4 )

Ceradocus hawaiensis J.L. Barnard, 1955: 5 , figs 2–3. —J.L. Barnard, 1970: 115, fig. 65. —J.L. Barnard, 1971: 70, fig. 41. — Ledoyer, 1972: 207, figs 30, 31. — Ledoyer, 1978: 266. — Berents, 1983: 103, fig. 2. — Lowry & Stoddart, 2003: 175.

Material examined. 14 specimens, AM P30646, Heron Island (23°27'S 151°55'E), living on the hermit crab Dardanus megistos, A.J. Bruce , 11 July 1980 .

Type locality. Hanauma Bay, Oahu , Hawaii (~ 21 o 16’N 157 o 42’W) .

Description. Based on female, 4.8 mm, AM P30646.

Head. Head with anteroventral notch. Antenna 1 peduncular article 1 subequal to article 2; accessory flagellum with 6 articles. Mandible palp article 1 with distal acute prolongation, article 3 shorter than article 2. Maxilla 1 inner plate triangular. Maxilla 2 inner plate with row of mediofacial setae.

Pereon. Gnathopod 1 coxa with acute anterodistal corner; carpus and propodus subequal. Gnathopod 2 asymmetrical; propodus with nearly transverse palm, that of larger gnathopod with several incisions. Pereopods 3–7 with narrow rectangular basis.

Pleon. Pleonites 1–2 with many small dorsal serrations. Pleonite 3 mediodorsally smooth, laterally with three curved spines. Epimera 1–2 posterior margin smooth, posterodistal corner with small upturned spine. Epimeron 3 with notches on ventral margin and one spine on posterior margin. Urosomites 1–2 with 2–3 with dorsal spines. Urosomite 3 smooth. Telson wider than long, deeply cleft, apices acutely tapering and each bearing 1–2 long robust setae (about the length of the telsonic lobes) and up to 4 short robust setae.

Male (sexually dimorphic characters). Based on male, AM P30646. Gnathopod 2 stronger, with more incisions.

Habitat. Commensal with the hermit crab Dardanus megistos .

Remarks. Ceradocus hawaiensis differs from other maerids species on the GBR by a wider posteroventral corner of the pereopod 7 basis and strongly produced posteroventral spine on epimeron 3.

Distribution. Australia. Queensland: Heron Island, Great Barrier Reef ( Berents 1983). USA. Hawaii (J.L. Barnard 1955, 1970). Madagascar ( Ledoyer 1972, 1978).

Figures

FIGURE 4. Ceradocus hawaiensis J.L. Barnard, 1955, female, 4.8 mm (pleonites 1–3), female, 6.4 mm, AM P30646, Heron Island, Great Barrier Reef (redrawn from Berents 1983).