Cymo deplanatus A. Milne-Edwards, 1873

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 : 200-201

Cymo deplanatus A. Milne-Edwards, 1873

( Fig. 5 A–D)

Cymo deplanatus A. Milne Edwards, 1873: 81 (257).

Type locality: Samoa, Upolu

Material examined. Red Sea: 1 ♂, 1 ♀, Gulf of Aqaba, 29°30.11’N 34°55.03’E, Acropora , coll. R. Diesel ( SMF 41735).—1 ♀, Jordan, Aqaba, ferry port, 29°27.71’N 34°58.51’E, 5 m, living Stylophora pistillata , 22.07.1995, coll. V. Neumann ( SMF 41755);1 ♀, 20 m, 0 1. 0 7. 1995, ( SMF 41757).— 1 ♂, Saudi Arabia, Alkhuraybah, 28° 6.46’ N 34° 59.45 E, living Stylophora , coll. A. Brösing, 23.06.2013 ( KAUMM 19).—1 ♀, edge of Sanganeb Atoll, 19° 43.31’N 37° 26.31’E, Acropora , 28.09.1992 ( SMF 41736).— 1 ♂, Sanganeb Atoll, 28 km NE of Port Sudan, 19°44.57’N 37°26.87’E, living Acropora , 1 m, 22.09.1992, coll. D. Fiege, F. Krupp & V. Neumann ( SMF 41756).

Comparative material from outside the Red Sea: 1 ♂, 1 ♀, Yemen, Socotra, N coast, E of Ras Quadamah, 12°41.902'N 53°39.681'E, 8 m, among Gladiella australis (Alcyoniidae) , 29.03.1999, coll. M. Apel ( SMF 41739).— 1 ♂, Yemen, Socotra, Abd al-kuri, N coast of Ras Anjara, 14 – 16 m, coral rubble, 14.04.1999, coll. M. Apel ( SMF 41740).— 2 ♂, Indonesia, Noordwachter I. (=Jaga Utara), 5°12’S 106°27’E, April-May 1885, coll. J. G. F. Brock ( ZMG 1216).— 1 ♂, Indonesia, Pulau Tabuhan, NW of Bali I., 8°2.27'S 114°27.55'E, 15 m, 0 4.04.1982, coll. H. Debelius ( SMF 12787).— 1 ♂, Philippines, Bantayan I., N of Cebu, 11°10’N 123°49’E, coll. A. Schreiber ( SMF 19739).

Diagnosis. Same as C. andreossyi except the carapace is slightly trapezoidal, yellow/grey in colour; dorsal surface smooth or nearly glabrous, gastric, frontal, orbital, anterolateral margins, branchial regions with small pointed granules ( Fig. 5 ). Frontal margin with 3 prominent spines, surrounded by thick bristles. Frontal lobes separated by deep incision with minute spine on each side ( Fig. 14 B). Inner orbital margin smooth.

Chelipeds: dorsal margin nearly smooth, dorsal part of carpus, propodus irregularly granular, granules largest on dorsal surface of propodus, tips of both fingers grey to brownish, tips of both chelae spoon shaped, both fingers of larger chela with 2 small molariform rounded teeth, smaller chela without molariform teeth.

G1 same as in C. andreossyi except the distal part has an additional inner spine with the sperm channel opening ( Fig. 6 B, C). G2 nearly identical as in C. andreossyi ( Fig. 6 D–F).

Gastric teeth as in C. andreossyi (see Fig. 7 A–D).

Remarks. Recorded here for the first time from the Red Sea (Gulf of Aqaba and Sanganeb Atoll, Sudan).

Geographical distribution. Same as C. andreossyi .

Figures

FIGURE 5. Cymo deplanatus. A, male, dorsal view; B, male, ventral view (Red Sea, KAUMM 19); C, female, dorsal view; D, female, ventral view (Red Sea, SMF 41736). Scale bars: A, B = 0.65 cm; C, D = 1.0 cm; Photos: Sven Tränkner (SMF).

FIGURE 6. Cymo deplanatus, male gonopods (Red Sea, SMF 41735), A – C, G 1; D – F, G 2; gsc., groove of sperm channel; sco., sperm channel opening. Scale bars: A, B, E = 300 µm, C, D = 100 µm.

FIGURE 7. Cymo deplanatus, gastric teeth (Red Sea, SMF 41735), male, 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: 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.