Cymo quadrilobatus Miers, 1884

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 : 207-209

Cymo quadrilobatus Miers, 1884

( Figs. 11 A–11F)

Cymo andreossyi var. quadrilobatus Miers, 1884: 532 .

Cymo quadrilobatus, Nobili, 1906: 272 .— Guinot 1962: 12.

Type locality: Daedalus Shoal, Red Sea

Material examined. Red Sea: 1 ♀, Saudi Arabian Red Sea coast, Al Lith, stn. 4, 20°15.055’N 39°57.725’E, 4, 5– 6 m, patch reef, 28.03.2011, coll. T. Alpermann ( SMF 41752).— 1 ♂, Port Sudan, Wingate Reef, 19°37.72’N 37°17.76’E, 5 m, live Pocillopora , 21.09.1992, coll. D. Fiege, F. Krupp & V. Neumann ( SMF 41764).

Comparative material from outside the Red Sea: 1 ♀, Maldives, Addu Atoll, wreck in lagoon, 0°38.88'S 73°7'E, 0 3.01.1958, Xarifa-Expedition, coll. H. Hass ( SMF 12725).— 1 ♂, 1 ♀, Maldives, Rasdhoo Atoll, off Veligandu I., 4°17.93'N 73°0.64'E, sand bottom with corals, 19.03.1958, Xarifa-expedition, coll. W. Klausewitz ( SMF 12726).— 1 ♂, Samoa, vend. Mus. Godeffroy ( SMF 1725).

Diagnosis. Same as C. andreossyi except the carapace is circular to hexagonal, usually with 4 orange to red spots, gastric, cardiac region well defined; dorsal surface of gastric region, frontal, orbital, anterolateral margins of carapace with prominent granules; gastric, pre-branchial region raised ( Fig. 11 A, C), Frontal margin bilobed, lobes separated by deep incision ( Fig. 14 D). Inner orbital margin smooth. Third maxillipeds slightly setose;

Chelipeds: merus, carpus, propodus with irregularly rounded granules; propodus, carpus short; fingers smooth, fingers of larger chela white or grey, spoon shaped with 2 molariform teeth, fingers of smaller chela brownish, pointed tips without molariform teeth. G1 and G2 nearly identical as in C. andreossyi (see 12A–G).

Gastric teeth are nearly identical as in C. andreossyi except the mesially directed cusps on the lateral teeth differs slightly ( Fig. 13 A–D).

Remarks. Cymo quadrilobatus was until now only known from its type locality, the Deadalus shoal (24°57’N 35°50’E) between Marsa Alam ( Egypt) and Al Wadjh Bank ( Saudi Arabia) ( Miers 1884) and unspecified localities of the Red Sea as listed by Nobili (1906) and Guinot (1962). The unspecified record published by Guinot (1962) refers to a collection of E. Ninni in 1929, chiefly from the Dahlak Archipelago of Eritrea and therefore might originate from that region. C. quadrilobatus is now recorded from the southern part of the Saudi Arabian Red Sea coast and the Sudanese coast.

Geographical distribution. Same as C. andreossyi .

Figures

FIGURE 11. Cymo quadrilobatus A, male, dorsal view; B, male, ventral view (Red Sea, SMF 41764); C, male, dorsal view; D, male, ventral view (SMF 12726); E, female, dorsal view; F, female, ventral view (Red Sea, SMF 41752). Scale bars: A, B = 0.9 cm; C, D = 1.8 cm; E, F = 1.7 cm; Photos: Sven Tränkner (SMF).

FIGURE 13. Cymo quadrilobatus, gastric teeth (Maldives, SMF 12726), 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, C, D = 300 µm; B, 100 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.