Parathelphusa sarasinorum ( 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 : 387-389

publication ID	https://doi.org/ 10.5281/zenodo.13245646
persistent identifier	https://treatment.plazi.org/id/03DF1C3D-FFA1-FFA3-7CA4-FCA1FEC1FAF1
treatment provided by	Felipe
scientific name	Parathelphusa sarasinorum ( Schenkel, 1902 )
status

Treatment

Parathelphusa sarasinorum ( Schenkel, 1902) View in CoL

( Figs. 2 View Fig , 3 View Fig F-I)

Potamon (Potamonautes) sarasinorum Schenkel, 1902: 525 , Pl. 10 Fig. 13b View Fig ; Rathbun, 1905: 200.

Parathelphusa (Mesothelphusa) sarasinorum View in CoL - Roux, 1915: 247, 249.

Parathelphusa (Parathelphusa) sarasinorum View in CoL - Bott, 1970b: 338; 1970c: 124, Pl. 23 Fig. 78-80, Pl. 31 Fig. 93.

Material examined. – Lectotype: male (38.9 x 31.5 mm) ( NMB 22 View Materials b), Lake Poso , Central Sulawesi, coll. Sarasin, 1901.

Paralectotypes: 5 males, 1 female ( NMB 22 View Materials a); same data as lectotype. Others : 1 male, 2 females ( ZRC 2000.2545 View Materials ), Lake Poso, East shore between Tentena and Peura, Central Sulawesi, coll. M. Kottelat, 24-25 Jun.1988 ; 7 males, 8 females ( ZRC 2000.1697 View Materials ) , 2 males, 2 females ( MZB 1499 View Materials ), Lake Poso, Tentena , Central Sulawesi, coll. C. D. Schubart et al., 20-21 Jan.2000 ; 4 males, 1 female, 1 juvenile ( ZRC 2000.1701 View Materials ), Lake Poso, Tindali east coast, under rocks and wood in sand, Central Sulawesi, coll. C. D. Schubart et al., 22 Jan.2000 ; 2 females ( ZRC 2000.1698 View Materials ), Lake Poso, Pendolo , south coast, slope 6m, in sand, Central Sulawesi, coll. C. D. Schubart et al., 22 Jan.2000 ; 1 female carrying juveniles ( ZRC 2000.1696 View Materials ), Lake Poso, Tentena , Central Sulawesi, coll. C. D. Schubart et al., 29 Jan.2000 ; 2 males, 4 females, 1 juvenile ( ZRC 2000.1700 View Materials ), Lake Poso, west coast near Taipa , Central Sulawesi, coll. C. D. Schubart et al., 22 Jan.2000 ; 5 males ( ZRC 2000.1699 View Materials ), Lake Poso, east coast, south of Tindoro among cliffs, Central Sulawesi, coll. C. D. Schubart et al., 22 Jan.2000 .

Diagnosis. – Carapace flat, dorsal surfaces smooth, light yellow to yellowish-green when live; cervical groove shallow, narrow; H-shaped central depression distinct. Epigastric and postorbital cristae continuous, sharp, subparallel to frontal margin; outer edge of cristae not reaching anterolateral margin, stopping just posterior to base of first epibranchial tooth. Frontal margin entire, straight; frontal median triangle distinct, complete. External orbital angle triangular, outer margin convex, about 1.8 times length of inner margin, first and second epibranchial teeth blunt, relatively broad, directed forwards, outer margins slightly truncate, distinct notch between external orbital angle and first epibranchial tooth, and between first and second epibranchial teeth. Posterolateral regions lined with few oblique striae. Suture between thoracic sternites 2 and 3 almost complete, gently concave towards buccal cavity. Palm of chelipeds inflated, longer than pollex, pollex pigmented brown throughout length, dactylus pigmented black throughout length. Ambulatory legs of normal length, second pair longest. Dorsal margin of merus with slight cristae, without distinct 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 gently concave; lateral margins of segment 6 subparallel, gently sinuous. G1 gently curving outwards, directed upwards, outer margin slightly sinuous, proximal part not clefted; distal part tapering. G2 with well developed distal segment, about 0.6 times length of basal segment.

Distribution. – Lake Poso, Central Sulawesi.

Palopo, Central Sulawesi, coll. M. Weber, Feb-Apr. 1889; 1 male, 1 female ( MZB 646 View Materials ), Sungai Lampea, Malili , Central Sulawesi, ca. 2 ° 38'S 121 ° 06'E, coll. F. Sabar, 7 Nov.1976 GoogleMaps .

Remarks. – Bott (1970c) designated one male (NMB 22b) as the lectotype from the original syntype series of six males and two females originally described by Schenkel (1902) from Lake Poso. The remaining specimens are thus paralectotypes.

Parathelphusa sarasinorum has blunt first and second epibranchial teeth that are relatively broad and directed forwards. The outer margins of the epibranchial teeth are slightly truncate with a distinct notch between external orbital angle and the first epibranchial tooth, and between the first and second epibranchial teeth. These are characters unique only to P. sarasinorum , easily distinguishing it from all other Sulawesi congeners. The only species that superficially resembles P. sarasinorum is perhaps Migmathelphusa olivacea , new species. Migmathelphusa olivacea also resembles P. sarasinorum in its live coloration, both being deep olive- to yellowish green with a yellow tinge on the edge of the carapace. However, P. sarasinorum differs from M. olivacea in that the latter species has a proportionately much broader propodus on the last pair of ambulatory leg compared to P. sarasinorum ( Fig. 35A View Fig vs. Fig. 2A View Fig ), possesses a distinctive long and slender G1 with its tip directed inwards ( Fig. 36 View Fig A-D), a G2 that has a proportionately short distal segment ( Fig. 36E View Fig ). In P. sarasinorum , the G1 is relatively shorter ( Fig. 3 View Fig F-I) and the G2 has a relatively longer distal segment (0.6 times length of basal segment vs. 0.4 times for M. olivacea ).