Cymo melanodactylus Dana, 1852

Brösing, Andreas, Al-Aidaroos, Ali M. & Türkay, Michael, 2014, The Red Sea species of Cymo de Haan, 1833 (Decapoda, Brachyura, Xanthidae), associates of scleractinian corals, Zootaxa 3779 (2), pp. 195-214 : 202-206

Cymo melanodactylus Dana, 1852

( Figs. 8 A–H)

Cancer (Cymo) meladactylus De Haan, 1833: 22 (nomen nudum).

Cymo melanonodactylus Dana, 1852: 225 ; 1855: pl. 13 fig. 1.

Cymo melanodactylus Pesta, 1911: 46 .— Neumann & Spiridonov, 1999: 26.— Apel, 2001: 83. Cymo andreossyi var. melanodactyla s. nuda Klunzinger, 1913: 256.

Type locality: Java, Indonesia

Material examined. Red Sea: 1 ♀, Jordan, Aqaba, ferry port, 29°27.71’N 34°58.51’E, 5 m, living Acropora , 12.07.1995, coll. V. Neumann ( SMF 41742); 1 ♂, 1 ♀ 05.07.1995 ( SMF 41743); 1 ♂, 1 ♀, 0 5.07.1995 ( KAUMM 20).— 1 ♂, 1 ♀, Sudan, Sanganeb Atoll abt. 28 km NE of Port Sudan, 19°44.57’N 37°26.87’E, outer fringe, living Acropora , 22.09.1992, coll. F. Krupp & V. Neumann ( SMF 41741); 1 ♂, 20 m, 0 3.04.1991 ( SMF 41762).

Comparative material from outside the Red Sea: 1 ♀, Saudi Arabian Gulf coast, Karan Isl., off S – coast, 10 – 13 m, 22.05.1995, coll. M. Apel ( SMF 41759).—2 ♀, Abu Ali, 27°19'N 49°38'E, living Acropora , 3 m, 13.04.1993, coll. M. Apel ( SMF 41760).— 2 ♂, 1 ♀, UAE, Abu Dhabi, Qarneyn I., NW Seite, 4–7 m, Acropora , coll. M. Apel ( SMF 41746).— 1 ♂, 1 ♀, UAE, Abu Dhabi, Qarneyn I., 24°56'N 52°52'E, rocky bottom with living corals, 9 – 10 m, 17.07.1995, coll. M. Apel ( SMF 41758).— 7 ♂, 3 ♀, UAE, Sharjah, about 500 – 800 m N of Lulayyah Port, 25°24'N 56°22'E, Acropora and other corals ( Porites [ Poritidae ], Platygyra [ Merulinidae ]), 3 – 5 m, 2.7.1995, coll. M. Apel ( SMF 41745).— 1 ♂, UAE, Fujairah, Sandy Beach Hotel, Al Aqqa, between mainland and small island, 25°30'N 56°22'E, sandy bottom, under stones and corals, 3 – 4 m, 0 4.07.1995, coll. M. Apel ( SMF 41763).— 1 ♂, 1 ♀, Yemen, Socotra, E of Hadibo, Hawlaf Bay, 12°40.519'N 54°4.17'E, dead colonies of Acropora valida , 9 – 10 m, 21.03.1999, coll. M. Apel ( SMF 41748).— 1 ♂, 2 ♀, Yemen, Socotra, N coast, between Hawlaf und Hadibo, 12°40.055'N 54°2.769'E, 28.2.1999, coll. M. Apel ( SMF 41749).— 1 ♂, Yemen, Socotra, Acropora , 15.04.1999, coll. M. Apel ( SMF 41750).—1 ♀, Yemen, Socotra, Abd al-Kuri, N coast, 0 6.04.2000, coll. R. Klaus ( SMF 41751).— 2 ♂, 5 ♀, Indonesia, Pulau Edam (= Pulau Damar Besar), 5°57.5’S 106°50.83’E, Jan.-Apr. 1885, coll. J. G. F. Brock ( ZMG 1218).

Diagnosis. Same as C. andreossyi except the carapace is yellow/grey; frontal, orbital, anterolateral margins of carapace with minute granules; carapace dorsally flattened, nearly glabrous ( Fig. 8 ). Frontal margin with 3 slightly pointed spines, mesial spines bifurcated, frontal lobes are separated by rounded incision ( Fig. 14 C). Inner orbital margin smooth.

Chelipeds: merus, carpus, propodus with minute irregular granules, tips of both fingers black, spoon shaped without molariform teeth.

G1 and G2 same as in C. andreossyi (see Fig. 9 A–F).

Gastric teeth same as in C. andreossyi (see Fig. 10 A–D)

Remarks. The species was until now only known from an unspecified locality in the Red Sea ( Pesta, 1911) and from an unrecorded locality in the Dahlak Archipelago ( Neumann & Spiridonov, 1999). It is now recorded from the Gulf of Aqaba and the Sudanese coast.

Geographical distribution. Same as C. andreossyi .

Figures

FIGURE 8. Cymo melanodactylus, A, male, dorsal view; B, male, ventral view (Red Sea, SMF 41762); C. female, dorsal view; D. female, ventral view (Red Sea, SMF 41743); E. male, dorsal view; F. male, ventral view (ZMG 1218); G. female, dorsal view; H. female, ventral view (ZMG 1218). Scale bars: A, B = 0.9 cm; C, D = 1.9 cm; E, F = 1.25 cm; G, H = 1.25 cm; Photos: Sven Tränkner (SMF).

FIGURE 9. Cymo melanodactylus, gonopods (ZMG 1218), A – C, G 1; D – F, G 2; gsc., groove of sperm channel; sco., sperm channel opening. Scale bars: A, C = 1 mm, B, D, F = 300 µm, E = 30 µm.

FIGURE 10. Gastric teeth of Cymo melanodactylus (ZMG 1218), A, dorsomedian view on the lateral teeth; B, lateral view on the accessory teeth; C, ventral view on the dorsomedian tooth; D, anterodorsal view on the cardiopyloric valve. acc., accessory teeth; at., anterior; cpv., cardio-pyloric valve; ls., lateral spine; ltc., large teeth cusp; pt., posterior; tl., transverse lamellae; ttc., transverse teeth cusp; uo., urocardiac ossicle; *, mesially directed cusps. Scale bars: A, B = 100 µm; C, D = 300 µm.

FIGURE 14. Views of antero-dorsal margin of carapace. A, Cymo andreossyi (Yemen, SMF 41727); B, C. deplanatus (South China Sea, ZMG 1216); C, C. melanodactylus (Indian Archipelago, ZMG 1218); D, C. quadrilobatus (Red Sea, SMF 41752). Scale bars: A, C, D = 300 µm; B, 200 µm.