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Crustacea: Decapoda: Potamoidea) from Northern Madagascar PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON 119(1):58–66. 2006. Foza raimundi, a new genus and species of potamonautid freshwater crab (Crustacea: Decapoda: Potamoidea) from northern Madagascar Sadie K. Reed and Neil Cumberlidge* (SKR) Department of Biology, Program in Evolution, Ecology, and Organismal Biology, ASEC 185, University of Akron, Akron, Ohio 44325-3908, U.S.A., e-mail: [email protected]; (NC) Department of Biology, Northern Michigan University, Marquette, Michigan 49855-5301, U.S.A., e-mail: [email protected] Abstract.—Foza raimundi, a new genus and species of freshwater crab from AntsirananaProvince,northernMadagascar,isdescribedfromahigh-altitude locality in the isolated Marojejy mountain range. The unusual combinationof characters of the new species warrants the establishment of a new genus to accommodate this taxon. The new taxon is compared to the other species of freshwater crabs occurring in Madagascar. The Malagasy freshwater crabs belong to the Potamonautidae, a family found exclusively in the Afrotropical zoogeographic region. The new taxon is endemic to Madagascar, as are the other six genera and 12 species of freshwater crabs found there. The most recent revision of the fresh- Sternberg 2002, 2003; Cumberlidge et al. water crabs of Madagascar (Cumberlidge 2004); there are also a number of reports & Sternberg 2002) recognized 12 species of their presence in phytotelmic habitats in six genera. The distribution of these in rainforest ecosystems (Cumberlidge et endemic crustaceans was described in al. 2002, Cumberlidge et al. 2005). detail by Cumberlidge & Sternberg We report here on the discovery of (2002) and by Cumberlidge et al. (2004); a new genus and species of freshwater crab the latter authors also assessed the from a high altitude locality in an isolated conservation status of each taxon. Of mountain range in northern Madagascar. concern is the fact that ten Malagasy The specimens described here are distinct- species were judged to be either threat- ly different from all known taxa in ened or extremely rare/endangered, and a number of important morphological only two taxa (Hydrothelphusa agilis A. taxonomic characters including those of Milne-Edwards, 1872 and H. madagasa- the mandible, gonopods, carapace, ster- cariensis (A. Milne-Edwards, 1872)) were num, epistome, chelipeds, walking legs, considered to be secure (Cumberlidge et and third maxilliped. This unusual com- al. 2004). The high degree of endemism bination of characters is sufficient to shown by the Malagasy freshwater crabs warrant the recognition of a new mono- is a characteristic that they share with typic genus to accommodate this species. other terrestrial and freshwater organisms Foza raimundi, new genus, new species, is from this tropical island. These crabs are compared to the other genera and species found in the lakes, streams, rivers, and of freshwater crabs from Madagascar. adjacent terrestrial habitats throughout The new taxon is assigned to the Potamo- the island (Bott 1960, 1965: Ng & Takeda nautidae sensu Cumberlidge (1999) and 1994; Cumberlidge 1999; Cumberlidge & Cumberlidge & Sternberg (2002). Abbreviations.—Terminology is adapt- * Corresponding author. ed from Cumberlidge (1999), and the VOLUME 119, NUMBER 1 59 classification used here follows that ter crab. Foza is treated as a feminine of Martin & Davis (2001). Abbrevia- noun. The spelling of the word ‘‘fosa’’ has tions: cw, distance across the carapace been modified because of the potential for at the widest point; cl, carapace length confusion that may arise from the simi- measured along the median line, from larity of the spelling and pronunciation of the frontal margin to the posterior ‘‘fosa’’ to the generic name and common margin; ch, carapace height, the maxi- name of two common Malagasy carni- mum height of the cephalothorax); vores. For example, the scientific name of fw, front width measured along the the Malagasy civet or striped civet is frontal margin; s, thoracic sternite; s4/s5, Fossa fossana (Viverridae), while ‘‘fossa’’, s5/s6, s6/s7, s7/s8, sternal sulci between also spelled ‘‘fosa’’, is the common name adjacent thoracic sternites; e, thoracic for the well-known Malagasy carnivore episternite; s4/e4, s5/e5, s6/e6, s7/e7, Cryptoprocta ferox (Cryptoproctidae) episternal sulci between adjacent thoracic (Dollar 2000a, 2000b). sternites and episternites; a, abdominal Remarks.—Foza, like all Malagasy segment; a6/a5, a7/a6, sutures between freshwater crab taxa, is assigned to the abdominal segments; p1–p5, pereopods Potamonautidae Bott, 1970, because of 1–5; asl, above sea level. All measure- the common possession of a number of ments are given in mm. FMNH 5 Field characters, including a two-segmented Museum of Natural History, Chicago, mandibular palp, a triangular abdomen, Illinois, U.S.A. and a first gonopod with either a short or medium length terminal article (Cumber- Systematics lidge 1999). Foza can be distinguished from the other Malagasy freshwater crab Subphylum Crustacea Bru¨nnich, 1772 genera (Hydrothelphusa A. Milne-Ed- Order Decapoda Latreille, 1802 wards, 1872, Madagapotamon Bott, Infraorder Brachyura Latreille, 1802 1965, Skelosophusa Ng & Takeda, 1994, Superfamily Potamoidea Ortmann, 1896 Marojejy Cumberlidge, Boyko, & Har- Family Potamonautidae Bott, 1970 vey, 2002, Malagasya Cumberlidge & Foza,n.gen. Sternberg, 2002, and Boreas Cumberlidge Type species.—Foza raimundi,n.sp. & Sternberg, 2002) as follows: the first Diagnosis.—Frontal margin of cara- gonopod of Foza has a wide-tipped, pace relatively narrow (fw/cw 0.25), broadly conical terminal article; the sec- sharply deflexed. Pterygostomial region ond gonopod has an extremely elongated of carapace sidewall with broad area of and inwardly curved flagellum-like termi- dense setae. Terminal article of gonopod nal article; the pterygostomial region has 1 short, wide-tipped, broadly conical. a dense field of setae, and the postfrontal Terminal article of gonopod 2 extremely crest is faint and incomplete with the long, flagellum-like, reaching anterior weak epigastric crests positioned so far margin of sterno-abdominal cavity; fla- forward on the front that they almost gellum of gonopod 2 curving inward touch the frontal margin. Interestingly, distally, tip sharply curved inward, over- this discovery means that the Marojejy all outline of flagellum forming ‘‘question mountains are home to four species of mark’’ shape; distal parts of flagellae of freshwater crabs belonging to four gen- both second gonopods overlapping one era, the other three taxa being Marojejy another, sometimes protruding from un- longimerus Cumberlidge, Boyko & Har- der closed abdominal telson. vey, 2002, Skelosophusa eumeces Ng & Etymology.—Foza is derived from the Takeda, 1994, and Hydrothelphsua Malagasy name ‘‘fosa’’ meaning freshwa- madagascariensis. 60 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON Foza is morphologically close to Mala- matically reduced short stub in Madaga- gasya because both taxa share a bilobed potamon). mandibular palp, elongated walking legs, a narrow deflexed front, and two pointed Foza raimundi, new species carpal teeth on the carpus of the cheliped. Figs. 1 and 2 However, Foza can be distinguished from Malagasya by the anterolateral margin of Holotype.—FMNH 7435: adult male the carapace, which is granular in Foza, (cw 22.9, cl 17, ch 10.9, fw 5.7 mm), but conspicuously toothed in Malagasya. Madagasacar, Antsiranana Province, Foza can be distinguished from Hydro- Parc National de Marojejy (5 Marojezy), thelphusa and Marojejy, the other Mala- 13 km SE Doany, on ridge between the gasy genera with a bilobed mandibular Andranomazava and Antsahaberaoka palp, as follows: the space between the Rivers (14u26.29S, 49u37.29E), caught by exorbital and epibranchial teeth in Foza is hand in undisturbed montane forest on very narrow as the result of the advanced slope with slightly wet ground, collected position of the epibranchial tooth (which by Achille Ruselimanana, 29 Oct 2001. is so far forward that it almost touches Paratypes.—FMNH 7436: adult ovi- the exorbital tooth), whereas in both gerous female (cw 25.2, cl 18.6, ch Hydrothelphusa and Marojejy there is 12.4, fw 6.1 mm), Antsiranana Province, a wide space between these teeth. The Parc National de Marojejy (5 Marojezy), long slender walking legs of Foza further 13 km SE Doany, on ridge between the distinguish this genus from Hydrothel- Andranomazava and Antsahaberaoka phusa whose walking legs are shorter, and Rivers (14u26.29S, 49u37.29E), 1070 m not unusually elongated. The eyestalks asl, found 20 cm below surface of soil, and corneas of Foza areofnormallength collected by S. M. Goodman, 29 Oct and size, which distinguishes this genus 2001; FMNH 7437: adult female oviger- from Marojejy whose eyestalks taper ous (cw 22.2, cl 17.4, ch 11.5, fw 5.7 mm), distally and whose corneas are very Antsiranana Province, Parc National reduced. de Marojejy (5 Marojezy) (14u26.29S, Foza is distinguished from Skeloso- 49u37.29E), 875 m asl, pitfall trap, col- phusa and Boreas by the form of the lected by Voahangy & Bomoina, 11 Feb terminal segment of the mandibular palp 2002; FMNH 7438: adult ovigerous (which has an enlarged anterior process female (cw 22.8, cl 15.7, ch 10.2, fw about 0.5 times as large as the posterior 6.6 mm), Antsiranana Province, Parc lobe in Foza, but only a small ledge-like National de Marojejy (5 Marojezy) (14u anterior process in Skelosophusa and 26.29S, 49u37.29E), 850 m asl, pitfall trap, Boreas). The long slender
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