taxonID	type	description	language	source
A9132D0CFFF6A11225B8DA58FE5CFEF2.taxon	materials_examined	Type species. Glabrithelphusa angene n. sp., by monotypy.	en	Meyer, Kirstin S., Cumberlidge, Neil, Koppin, Jennifer C. (2014): A new genus and species of freshwater crab from Madagascar (Decapoda, Brachyura, Potamoidea, Potamonautidae). Zootaxa 3884 (1): 65-72, DOI: 10.11646/zootaxa.3884.1.5
A9132D0CFFF6A11225B8DA58FE5CFEF2.taxon	etymology	Etymology. The name Glabrithelphusa refers to the characteristic smooth (glabrous in Latin) and untextured nature of the dorsal carapace of this taxon, in suite with the traditional freshwater crab genus name Thelphusa, and is a masculine noun in the singular.	en	Meyer, Kirstin S., Cumberlidge, Neil, Koppin, Jennifer C. (2014): A new genus and species of freshwater crab from Madagascar (Decapoda, Brachyura, Potamoidea, Potamonautidae). Zootaxa 3884 (1): 65-72, DOI: 10.11646/zootaxa.3884.1.5
A9132D0CFFF6A11225B8DA58FE5CFEF2.taxon	diagnosis	Diagnosis. Mandibular palp 2 - segmented with small, hard, anterior lobe at junction between segments, 0.25 x length of terminal segment (Fig. 2 D, E). Entire dorsal surface of carapace smooth; cervical grooves short; suborbital region smooth; postfrontal crest faint, incomplete, epibranchial, exorbital teeth weak, low; space or cleft between epibranchial tooth and exorbital tooth reduced to small but distinct shallow notch (Fig. 1 A, 3 A); third maxilliped with deep vertical sulcus on ischium (Fig. 1 C). Sternal sulcus s 3 / s 4, faint, reduced to 2 side-notches (Fig. 2 F). Major cheliped with 3 unfused molars (Fig. 1 F). G 1 terminal article with conspicuously raised lobe on superior margin, distal third of G 1 subterminal segment curved outward (Fig. 2 A, B, 4 A, B, C, D); G 2 terminal segment flagellum-like, straight, no distal curve (Fig. 2 C, 4 E). Walking legs (p 2 ‒ p 5) normal length, not elongated (p 5 merus / CW = 0.28) (Fig. 3 A).	en	Meyer, Kirstin S., Cumberlidge, Neil, Koppin, Jennifer C. (2014): A new genus and species of freshwater crab from Madagascar (Decapoda, Brachyura, Potamoidea, Potamonautidae). Zootaxa 3884 (1): 65-72, DOI: 10.11646/zootaxa.3884.1.5
A9132D0CFFF6A11225B8DA58FE5CFEF2.taxon	discussion	Remarks. Glabrithelphusa n. gen. is assigned to the Potamonautidae Bott, 1970, because of the common possession of a suite of diagnostic familial characters, including a 2 - segmented mandibular palp (Fig. 2 D, E), a triangular abdomen (Fig. 2 F), and a G 1 with a medium-length terminal article (Fig. 2 A, B, 4 A, B) (Cumberlidge 1999). Glabrithelphusa can be distinguished from the other Malagasy freshwater crab genera by the form of the mandibles. Although all potamonautid crabs possess a 2 - segmented mandibular palp within this family, there is a great deal of variation of mandible characters, especially among the crabs found in Madagascar (Cumberlidge 1999; Cumberlidge & Sternberg 2002). Cumberlidge & Sternberg (2002 Fig. 4 A-L) grouped Malagasy freshwater crabs based on mandibular palp characters as follows. Taxa with a simple mandible, completely lacking a lobe of any kind at the junction between the segments (Madagapotamon Bott, 1965); taxa with a small, hard ledge-like anterior lobe on the mandible about 0.1 times as long as the terminal segment (Skelosophusa Ng & Takeda, 1994, and Boreathelphusa Cumberlidge, 2010); and taxa with a clearly bilobed terminal segment with a substantial medium-sized anterior lobe about 0.5 times as long as the terminal segment (Hydrothelphusa A. Milne-Edwards, 1872, Marojejy Cumberlidge, Boyko, & Harvey, 2002, Malagasya Cumberlidge & Sternberg, 2002, and Foza Reed & Cumberlidge, 2006). Here we recognize a fourth kind of mandibular structure in Madagascan freshwater crabs for Glabrithelphusa n. gen. in which the mandible has a small, hard ledge-like anterior lobe about 0.25 x as long as the terminal segment (Fig. 2 D, E). Besides the mandibles, other important taxonomic characters that set Glabrithelphusa n. gen. apart from the seven other Madagascar freshwater crab genera include its completely smooth dorsal carapace surface (Fig. 1 A, 3 A; Cumberlidge & Sternberg 2002 Fig. 2 A-F). Glabrithelphusa n. gen. can also be distinguished from Foza and Malagasya by the smooth anterolateral margin of the carapace (Fig. 1 A, 3 A), which has small teeth in Foza (Reed & Cumberlidge Fig. 1), and conspicuous teeth in Malagasya. The new genus can be distinguished from Hydrothelphusa and Marojejy by the small notch-like space between the exorbital and epibranchial teeth in Glabrithelphusa n. gen. (Fig. 1 A, 3 A), versus a wide space or cleft between these teeth in both Hydrothelphusa and Marojejy (Cumberlidge & Sternberg 2002 Fig. 1 A-C, 2 F). The walking legs (not elongated or slim) and eyestalks and corneas (normal length and size) of Glabrithelphusa n. gen. (Fig. 1 A, 3 A) further distinguish this genus from Marojejy whose walking legs are long, slender, and elongated, and whose eyestalks taper distally and have reduced corneas (Cumberlidge & Sternberg 2002 Fig. 2 F, 8 F). Glabrithelphusa n. gen. is distinguished from Madagapotamon by the length of the flagellum of the exopod of the third maxilliped, which is long and well developed in Glabrithelphusa n. gen. (Fig. 1 C), but almost absent, and reduced to a short stub in Madagapotamon (Cumberlidge & Sternberg 2002 Fig. 5 H).	en	Meyer, Kirstin S., Cumberlidge, Neil, Koppin, Jennifer C. (2014): A new genus and species of freshwater crab from Madagascar (Decapoda, Brachyura, Potamoidea, Potamonautidae). Zootaxa 3884 (1): 65-72, DOI: 10.11646/zootaxa.3884.1.5
A9132D0CFFF6A11225B8DA58FE5CFEF2.taxon	distribution	Distribution. Madagascar.	en	Meyer, Kirstin S., Cumberlidge, Neil, Koppin, Jennifer C. (2014): A new genus and species of freshwater crab from Madagascar (Decapoda, Brachyura, Potamoidea, Potamonautidae). Zootaxa 3884 (1): 65-72, DOI: 10.11646/zootaxa.3884.1.5
A9132D0CFFF4A11625B8DE39FA34FC82.taxon	materials_examined	Material examined. MADAGASCAR. Adult male holotype by present designation (cw 41.5, cl 29.3, ch 15.3, fw 12.4 mm), no locality or collection information (MNHN-IU- 2013 - 11978). Paratypes: 4 adult males (cw 40.4, cl 29.0, ch 14.9, fw 11.3 mm; cw 37.4, cl 27.9, ch 15.1, fw 10.6 mm; cw 45.4, cl 32.7, ch 17.0, fw 13.0 mm; cw 43.6, cl 31.8, ch 16.6, fw 12.3 mm), 3 adult females (cw 36.9, cl 28.6, ch 16.7 fw 10.8 mm; cw 36.5, cl 27.6, ch 14.8, fw 10.6 mm; cw 39.2, cl 28.4, ch 14.9, fw 10.5 mm) (MNHN-IU- 2013 - 11979), same data as holotype. Type locality. Madagascar. Exact locality and habitat unknown.	en	Meyer, Kirstin S., Cumberlidge, Neil, Koppin, Jennifer C. (2014): A new genus and species of freshwater crab from Madagascar (Decapoda, Brachyura, Potamoidea, Potamonautidae). Zootaxa 3884 (1): 65-72, DOI: 10.11646/zootaxa.3884.1.5
A9132D0CFFF4A11625B8DE39FA34FC82.taxon	distribution	Distribution. Only known from Madagascar.	en	Meyer, Kirstin S., Cumberlidge, Neil, Koppin, Jennifer C. (2014): A new genus and species of freshwater crab from Madagascar (Decapoda, Brachyura, Potamoidea, Potamonautidae). Zootaxa 3884 (1): 65-72, DOI: 10.11646/zootaxa.3884.1.5
A9132D0CFFF4A11625B8DE39FA34FC82.taxon	diagnosis	Diagnosis. As for genus.	en	Meyer, Kirstin S., Cumberlidge, Neil, Koppin, Jennifer C. (2014): A new genus and species of freshwater crab from Madagascar (Decapoda, Brachyura, Potamoidea, Potamonautidae). Zootaxa 3884 (1): 65-72, DOI: 10.11646/zootaxa.3884.1.5
A9132D0CFFF4A11625B8DE39FA34FC82.taxon	description	Description (based on holotype, adult male cw 41.5 mm). Carapace (Fig. 1 A, 3 A) outline transversely oval, high (ch / fw 1.34); front narrow (fw / cw 0.27), deflexed; epibranchial, exorbital teeth small, low; space or cleft between epibranchial tooth and exorbital tooth reduced to small but distinct shallow notch; anterolateral margin evenly curved outward, completely smooth. Postfrontal crest faint, incomplete, postorbital crests, epigastric crests poorly defined, positioned well forward almost in line with postorbital margins; short, broad shallow mid-groove between epigastric crests; cardiac, urogastric grooves shallow, cervical grooves faint, short (Fig. 1 A, 3 A). Entire dorsal surface of carapace smooth (Fig. 1 A, 3 A). Suborbital, subhepatic regions of carapace sidewall completely smooth, pterygostomial region with fields of carinae near buccal margin, fading to smooth posteriorly; vertical sulcus on carapace sidewall curved, raised, faintly granular, running from base of epibranchial tooth to epimeral sulcus (Fig. 1 B, 3 C). Epimeral sulcus heavily granular between suborbital, anterior pterygostomial regions, smooth posteriorly. Epistomial tooth triangular, deflexed, edges smooth (Fig. 1 B, 3 C). Third maxilliped exopod long, reaching beyond ischium / merus junction, exopod flagellum long reaching beyond superior margin of third maxilliped merus; ischium with deep, wide vertical sulcus (Fig. 1 C, 3 B, C). Mandibular palp 2 - segmented with small, hard, anterior lobe at junction between segments, 0.25 x length of terminal segment (Fig. 2 D, E). Sternal sulcus s 1 / s 2 short, very faint; sternal sulcus s 2 / s 3 completely crossing sternum; sternal sulcus s 3 / s 4 reduced to 2 short, deep notches at margins (Fig. 2 F, 3 B); anterior sternoabdominal cavity smooth, lacking dense setae (Fig. 2 F, 3 B). Episternal sulci s 4 / e 4, s 5 / e 5, s 6 / e 6, s 7 / e 7 absent, smooth (Fig. 2 F, 3 B). Male abdomen slim, triangular, tapered, widest at a 3, narrowest at a 7 (telson); telson outline forming triangle with rounded apex, straight sides, broad base (Fig. 2 F, 3 B). Sternal groove s 4 / s 5 meeting a 7 well past a 6 / a 7 junction; sternal groove s 6 / s 7 close to a 6 / a 7 junction, meeting a 6 3 / 4 of segment length from a 6 / a 5 (Fig. 2 F, 3 B). G 1 terminal article short (length of terminal article to subterminal segment ratio 0.23), slim, with short setae, tapering to broad tip, directed outward, straight; medial fold on ventral terminal article raised; lateral fold not raised, folds basally separated, meeting midway along ventral face of article to form longitudinal groove that continues to tip of article; groove not visible on dorsal face; distal third of subterminal segment of G 1 slim, curving outward for short distance near junction of terminal article with subterminal segment, with raised rounded shoulder on subterminal segment external margin (Fig. 2 AB, 4 A, B, C, D). Junction between G 1 terminal article, subterminal segment clearly visible on ventral side. G 1 terminal article, subterminal segment separated on dorsal side by broad, subtriangular dorsal membrane; dorsal membrane superior margin formed by horizontal basal margin of terminal article, inferior margin of membrane formed by U-shaped distal edge of subterminal segment; lateral, medial margins of dorsal membrane narrow (Fig. 2 B, 4 A, C,). G 1, G 2 subterminal segments equal in length, but G 2 terminal article twice as long as G 1 terminal article (Fig. 2 C, 4 E). G 2 terminal article long, well-developed, straight, no distal curve, one-half length of G 2 subterminal segment (Fig. 2 C, 4 E). Dactylus of both chelipeds relatively slender, approximately one-third height of palm, cutting edge lined by small, even teeth; upper margin of dactylus smooth; lower margin of propodus slightly indented (Fig. 1 F, G). Fixed finger of propodus of major (right) cheliped slender with 3 unfused molars in proximal region followed by series of small pointed teeth (Fig. 1 F). First carpal tooth on inner margin of cheliped carpus large, pointed; second carpal tooth smaller, pointed, followed by series of very small teeth (Fig. 1 D). Medial, lateral, margins of inferior face of cheliped merus smooth, inferior face with small pointed, distal meral tooth; superior margin, superior face of cheliped merus smooth; cheliped ischium rounded, smooth (Fig. 1 D, E). Walking legs p 2 ‒ p 5 normal length, not elongated (p 5 merus / cw = 0.32), inner margins of propodi of p 2 ‒ p 5 smooth (Fig. 3 A, B).	en	Meyer, Kirstin S., Cumberlidge, Neil, Koppin, Jennifer C. (2014): A new genus and species of freshwater crab from Madagascar (Decapoda, Brachyura, Potamoidea, Potamonautidae). Zootaxa 3884 (1): 65-72, DOI: 10.11646/zootaxa.3884.1.5
A9132D0CFFF4A11625B8DE39FA34FC82.taxon	discussion	Remarks. The new species is distinguished from other species of Madagascan freshwater crabs by a unique suite of characters of the mandible, carapace, and gonopods (see Remarks for genus). The specimens described here are morphologically closest to the three species of the genus Foza (Reed & Cumberlidge 2006; Cumberlidge & Meyer 2009). Glabrithelphusa angene n. sp. can be distinguished from these by its completely smooth dorsal carapace (Fig. 1 A, 3 A) (versus strong carinae on the posterior dorsal carapace in F. raimundi and F. goudoti (Reed & Cumberlidge 2006 Fig. 1 B; Cumberlidge & Meyer 2009 )), by granules on the anterolateral carapace surface in F. ambohitra Cumberlidge & Meyer 2009 Table 1), and by its mandible with a shortened anterior lobe, 0.25 x terminal segment length (Fig. 1 D, E) (versus a mandible with a large anterior lobe, 0.5 x terminal segment length (Reed & Cumberlidge 2006; Cumberlidge & Meyer 2009 )).	en	Meyer, Kirstin S., Cumberlidge, Neil, Koppin, Jennifer C. (2014): A new genus and species of freshwater crab from Madagascar (Decapoda, Brachyura, Potamoidea, Potamonautidae). Zootaxa 3884 (1): 65-72, DOI: 10.11646/zootaxa.3884.1.5
A9132D0CFFF4A11625B8DE39FA34FC82.taxon	etymology	Etymology. The specific name angene is a combination derived from the names of the first author’s parents (Angela and Gene Meyer) used as a noun in apposition and is in recognition of their contributions to her education.	en	Meyer, Kirstin S., Cumberlidge, Neil, Koppin, Jennifer C. (2014): A new genus and species of freshwater crab from Madagascar (Decapoda, Brachyura, Potamoidea, Potamonautidae). Zootaxa 3884 (1): 65-72, DOI: 10.11646/zootaxa.3884.1.5
