Syntripsa matannensis ( Schenkel, 1902 )

Ng, Oliver K. S. Chia Peter K. L., 2006, The Freshwater Crabs Of Sulawesi, With Descriptions Of Two New Genera And Four New Species (Crustacea: Decapoda: Brachyura: Parathelphusidae), Raffles Bulletin of Zoology 54 (2), pp. 381-428 : 409-410

Syntripsa matannensis ( Schenkel, 1902)

( Figs. 27 , 28 , 31 A-E)

Potamon (Parathelphusa) matannensis Schenkel, 1902: 517 , Pl. 10

Fig. 13d , Pl. 11 Fig. 14 ; Rathbun, 1905: 233. Parathelphusa (Parathelphusa) matannensis - Roux, 1915: 247,

249. Parathelphusa matannensis - Balss, 1934: 178. Nautilothelphusa matannensis - Bott, 1970c: 133, Pl. 25 Figs. 5-

7. Parathelphusa matannensis - Ng, 1988a: 96.

Material examined. – Lectotype: male (31.3 x 25.6 mm) ( NMB 20 a), Lake Matano , South Sulawesi, coll. P. Sarasin & F. Sarasin, 1901 . Paralectotypes: 3 females ( NMB 20 a), same data as lectotype. Others : 1 female ( NMB 20 b), Lake Matano , South Sulawesi, coll. Amsterdam Museum, 1916 ; 5 males, 2 females ( ZRC 2000.1685 ), Lake Matano, south west coast near Matano , under rocks and logs on sand, South Sulawesi, 2 ° 27'41.5"S 121 ° 13'6.3"E, coll. C. D. Schubart et al., 24 Jan.2000 ; 2 females ( ZRC 2000.1686 ) , 1 female ( MZB 1494 ), Lake Matano , east coast from fishermen, South Sulawesi, coll. C. D. Schubart et al., 24 Jan.2000 ; 1 male, 2 females ( ZRC 2000.2546 ), Lake Matano, south coast, west of Soroaka , South Sulawesi, coll. M. Kottelat, 18 Jun.1988 ; 1 male ( ZRC 2000.2547 ), Lake Matano , southern coast, about midway between Matano and Soroako, South Sulawesi, coll. M. Kottelat, 31 Jan.1991 ; 5 males, 1 female ( ZRC 2000.2548 ) , 1 male ( MZB 1493 ), Lake Matano outlet, South Sulawesi, coll. M. Kottelat, 1995 ; 1 female ( ZRC 2000.2549 ), Lake Matano, Pontada Beach, Soroako , South Sulawesi, coll. M. Kottelat, 30 Jun.1988 ; 1 male ( ZRC 2000.2550 ), Lake Matano, Soroako , South Sulawesi, coll. F. Sabar, 15 Nov.1982 ; 1 male ( ZRC 2000.2551 ), Lake Matano, southern coast, east of Tandjung Potipuana , South Sulawesi, coll. M. Kottelat, 1 Feb.1991 ; 1 female ( ZRC 2000.2552 ), Lake Matano, about 2 km southeast of Matano , South Sulawesi, coll. M. Kottelat & A. Werner, 18 Mar.1989 ; 1 male, 1 female ( MNHB 27379 ), Lake Matano , South Sulawesi, 2 ° 26.97'S 121 ° 13.00'E, coll. M. Glaubrecht & T. von Rintelen, 15 Aug.1999 ; 1 female ( MNHB 27378 ), Lake Matano , South Sulawesi, 02 ° 30.43'S 121 ° 19.96'E, coll. M. Glaubrecht & Rintelen, Jul.1999 ; 1 male, 1 female ( MNHB 27381 ), Lake Matano , South Sulawesi, coll. M. Glaubrecht & T. von Rintelen, 14 Aug.1999 ; 1 male, 1 female ( MNHB 27380 ), Lake Matano , South Sulawesi, 2 ° 26.01'S 121 ° 13.03'E, coll M. Glaubrecht & T. von Rintelen, 17 Aug.1999 .

Diagnosis. – Carapace narrowly transverse to squarish, inflated, rugose, branchial regions inflated, deep reddish purple when live; cervical groove shallow, indistinct; Hshaped central depression shallow. Epigastric and postorbital cristae continuous, weak, subparallel to frontal margin; outer edge of cristae reach anterolateral margin, stopping just above base of first epibranchial tooth. Front entire with shallow depression medially; frontal median triangle distinct, complete, deeply recessed. Eyestalk white. Epistome posterior margin fused, continuous. External orbital angle triangular, outer margin convex, about 2 times length of inner margin, tip of external orbital angle usually extends just beyond frontal margin, first and second epibranchial teeth triangular, equal, directed forwards, outer margins almost straight. Third maxilliped merus anterior margin with a median notch. Posterolateral regions lined with few oblique striae. Suture between thoracic sternites 2 and 3 complete, straight. Chelipeds strongly asymmetrical even in smaller specimens, larger chela very stout, inflated, base of finger with large, white, molariform teeth, palm of chelipeds inflated, longer than pollex, pollex and dactylus pigmented black throughout length. Ambulatory legs of normal length, pigmented white between joints, second pair longest. Dorsal margin of merus with slight cristae, with distinct, sharp, subterminal spine. Male abdomen reaching imaginary line joining anterior edges of cheliped bases, T-shaped, segment 6 distinctly longer than segment 7; lateral margins of segment 7 concave; lateral margins of segment 6 subparallel, gently sinuous. G1 slender, gently curving outwards, directed upwards, outer margin slightly sinuous, proximal part slightly clefted; distal part tapering, tip slightly flared. G2 with well developed distal segment, about 0.5 times length of basal segment.

Distribution. – Lake Matano, South Sulawesi.

Remarks. – Schenkel (1902) described Potamon (Parathelphusa) matannensis from a single male and three females from Lake Matano, Sulawesi. However, he did not designate a holotype. Bott (1970c) in his monograph examined only a female (NMB 20b) but he too did not designate a lectotype. The male specimen measuring 25.2 by 31.0mm (NMB 20a) from the original series is here designated as the lectotype of the species ( Fig. 28 ).

Syntripsa matannensis is known only from its type locality, Lake Matano, while Syntripsa flavichela , new species, is known only from Lake Mahalona and Lake Towuti thus far. Even if future collections show both of them to be syntopic, there are enough distinct characters to differentiate them. The key characters that differentiate S. matannensis and S. flavichela are elaborated at length under S. flavichela .

Figures

Fig. 27. Generic characters of Syntripsa. Syntripsa matannensis (Schenkel, 1902), lectotype male (31.3 x 25.7 mm, NMB 20a): A, fused continuous epistome margin; B, third maxilliped merus with median notch on anterior margin; C, base of cheliped finger with large, white, molariform tooth. Scale bars = 1.0 mm.

Fig. 28. Syntripsa matannensis (Schenkel, 1902), lectotype male (31.3 x 25.7 mm, NMB 20a): A, dorsal view; B, frontal view; C, ventral view.

Fig. 31. Left G1 and G2. A-E, Syntripsa matannensis (Schenkel, 1902), lectotype male (31.3 x 25.6 mm, NMB 20a): A, G1 ventral view; B, G1 dorsal view; C, G1 distal part, ventral view; D, G1 distal part, dorsal view; E, G2. F-J, Syntripsa flavichela, new species, holotype male (59.1 x 46.7 mm, MZB 1483): F, G1 ventral view; G, G1 dorsal view; H, G1 distal part, ventral view; I, G1 distal part, dorsal view; J, G2. Scale bars = 1.0 mm.

Fig. 13. Parathelphusa pallida (Schenkel, 1902), female (NMB 23 Ia) (lectotype of Potamon (Potamonautes) celebensis var.annulipes Schenkel, 1902): A, dorsal view; B, frontal view; C, ventral view.

Fig. 14. G1 and G2. A-E, Parathelphusa celebensis (De Man, 1892), male (33.3 x 26.1 mm, NMB 23IVa): A, left G1 ventral view; B, left G1 dorsal view; C, left G1 distal part, ventral view; D, left G1 distal part, dorsal view; E, left G2. F-J, Parathelphusa pallida (Schenkel, 1902), lectotype male (23.9 x 18.3 mm, NMB 23VIb): F, right G1 dorsal view; G, right G1 ventral view; H, right G1 distal part, dorsal view; I, right G1 distal part, ventral view; J, G2. Scale bars = 1.0 mm.

Fig. 5. Parathelphusa lokaensis (De Man, 1892), male (24.5 x 20.2 mm, NMB 23Vc): A, dorsal view; B, frontal view; C, ventral view.

Fig. 6. Left G1 and G2. A-E, Parathelphusa lokaensis (De Man, 1892), lectotype male (24.3 x 20.0 mm, RMNH D 1286): A, G1 dorsal view; B, G1 ventral view; C, G1 dorsal part, ventral view; D, G1 distal part, ventral view; E, G2. F-J, Parathelphusa lokaensis (De Man, 1892), male (24.5 x 20.2 mm, NMB 23Vc): F, G1 ventral view; G, G1 dorsal view; H, G1 distal part, ventral view; I, G1 distal part, dorsal view; J, G2. Scale bars = 1.0 mm.

Fig. 7. Parathelphusa ceophallus Ng, 1993, holotype male (23.1 x 18.1mm) (RMNH D 42418): A, right dorsal view of carapace; B, frontal view of carapace; C, frontal median triangle; D, anterior thoracic sternum; E, male abdominal segmenst 4-6 and telson; F, left third maxilliped; G, right fourth ambulatory leg; H, left G1 ventral view; I, left G1 dorsal view; J, left G1 distal part, ventral view; K, left G1 distal part, dorsal view; L, left G2 (after Ng, 1993: Figs. 1, 2). Scale bars: A-G = 1.0 mm; H, I, L = 0.5 mm; J, K = 0.25 mm.