Sundathelphusa cassiope (De Man, 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 : 418-419

Sundathelphusa cassiope (De Man, 1902)

( Figs. 39A , 40 )

Potamon (Geothelphusa) cassiope De Man, 1902: 568 , Pl. 20 Fig. 18 ; Rathbun, 1905: 211.

Potamon (Geothelphusa) minahassae – Schenkel, 1902: 540, Pl. 11 Fig. 15 (part); Rathbun, 1905: 211 (part).

Potamon cassiope – Roux, 1904: 570.

Potamon minahassae – Roux, 1904: 570.

Para -Lio-thelphusa minahassae – Balss, 1937: 155, Figs. 13 , 14 (part).

Sundathelphusa cassiope cassiope – Bott, 1970c: 76, Pl. 11 Figs. 24-29 , Pl. 28 Fig. 47; Ng & Stuebing, 1989: 13.

Material examined. – Paralectotype: male (25.6 by 21.8 mm) ( NMB 984 a), northern Sulawesi, coll. M. Weber.

Remarks. – De Man (1902) described this species from a series of specimens from Minahassa in northern Sulawesi, Batjan in Moluccas and Soah Konorah in Halmahera. Bott (1970c: 76) selected a male specimen (39.0 by 31.0 mm) from northern Sulawesi in the Senckenberg Museum as the lectotype of the species. All the other specimens, including the syntype specimen in NMB are thus paralectotypes.

Of the three species known from Sulawesi, S. cassiope is easily distinguished from the other two by its proportionately much broader carapace with a strongly convex anterolateral margin which appears distinctly transversely subovate. The carapaces of S. minahassae and S. rubra on the other hand, have less convex anterolateral margins and appear more squarish.

With regards to the strongly convex anterolateral margins and relatively swollen carapace, S. cassiope is perhaps most similar to S. aruana ( Roux, 1911) ( Figs. 42A , 43 ) from nearby Moluccas. We examined the lectotype male of Potamon (Geothelphusa) aruana Roux, 1911 (paralectotype male, 27.9 by 21.5 mm, NMB 695a) and the two can easily be distinguished. Compared to S. aruana , S. cassiope has a relatively less swollen carapace, an external orbital angle which is more distinctly cut from the rest of the anterolateral margin by a deep cleft (vs. shallow), and the G1 being relatively straighter with the tip truncate (vs. more curved with the tip sharp). There can be little doubt that the two are separate taxa.

Figures

Fig. 39.Dorsal views. A, Sundathelphusa cassiope (De Man, 1902), paralectotype male (25.6 by 21.8 mm, NMB 984a); B, Sundathelphusa minahassae (Schenkel, 1902), paralectotype male (39.0 by 30.4 mm, NMB 34a).

Fig. 40. Sundathelphusa cassiope (De Man, 1902), paralectotype male (25.6 by 21.8 mm, NMB 984a). A, G1 ventral view; B, G1 dorsal view; C, G1 distal part, ventral view; D, G1 distal part, dorsal view; E, G2. Scale bars = 1.0 mm.

Fig. 18. Parathelphusa pareparensis (De Man, 1892), male (29.5 x 22.9 mm, ZRC 2000.2570): A, dorsal view; B, frontal view; C, ventral view.

Fig. 15. Parathelphusa tenuipes (Schenkel, 1902), holotype female (32.6 x 24.4 mm, NMB 23IIa): A, dorsal view; B, frontal view; C, ventral view.

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. 24. Parathelphusa sorella, new species, holotype male (40.2 x 26.1 mm, ZRC 1990.490): A, dorsal view; B, frontal view; C, ventral view.

Fig. 25. Parathelphusa ferruginea, new species, holotype male (36.0 x 28.5 mm, MZB 1491): A, dorsal view; B, frontal view; C, ventral view.

Fig. 26. Left G1 and G2. A-E, Parathelphusa sorella, new species, holotype male (40.2 x 26.1 mm, ZRC 1990.490): A, G1 ventral view; B, G1 dorsal view; C, G1 distal part, ventral view; D, G1 distal part, dorsal view; E, G2. F-J, Parathelphusa ferruginea, new species, holotype male (36.0 x 28.5 mm, MZB 1491): 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. 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. 29. Syntripsa flavichela, new species, holotype male (59.1 x 46.7 mm, MZB 1483): A, dorsal view; B, dorsal view of carapace; C, frontal view.

Fig. 42. Dorsal views. A, Sundathelphusa aruana (Roux, 1911), paralectotype male (27.9 by 21.5 mm, NMB 695a); B, Sundathelphusa rubra (Schenkel, 1902), lectotype male (22.6 by 17.4 mm, NMB 38a).

Fig. 43. Sundathelphusa aruana (Roux, 1911), paralectotype male (27.9 by 21.5 mm, NMB 695a). 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. Scale bars = 1.0 mm.