Pseudograpsus crassus A. Milne-Edwards, 1868

Lagare, Nickel Jean S., Mapi-Ot, Emmarie F., Molina, Ziljih S., Neri, Jemateo B., Nuñeza, Olga M. & Mendoza, Jose Christopher E., 2020, On a collection of freshwater and estuarine crabs (Crustacea: Brachyura) from Mindanao Island, the Philippines, Zootaxa 4868 (3), pp. 301-330 : 314

Pseudograpsus crassus A. Milne-Edwards, 1868

Fig. 4F

Pseudograpsus crassus, Ward 1941: 2 .

Material examined. 1 male, 34.5 by 30 mm, 2 females, 37.3 by 32.0 mm, 30.1 by 26.9 mm ( ZRC; NJL160831–33 ) Iligan town, Lanao del Norte prov., coll. N.J. Lagare, 19–21 Sep. 2016 .

Remarks. Pseudograpsus crassus A. Milne-Edwards, 1868 (type locality: Sulawesi, Indonesia) has been recorded mostly from Indonesian islands, including Halmahera, Karakelong, Flores, and Sumba, and from freshwater habitats up to an altitude of 800 m asl ( Holthuis 1978; Cai & Ng 2003). Pseudograpsus crassus has only been previously reported once from the Philippines, particularly in a list of crabs collected from the Davao Gulf by Ward (1941). The present material from Iligan agrees well with published descriptions and figures (A. Milne-Edwards 1868: 176, pl. 26 figs. 6–10; Tesch 1918a: 98). Their live colouration is quite distinctive, with the carapace and chelipeds having a marmorate to reticulate patterning of dark brown and yellow ( Fig. 4F ). The crabs were found hiding beneath rocks along the slow moving stream about 1 km inland, and syntopic with the freshwater potamid crab, Isolapotamon sp., as well as other grapsoid crabs, Utica gracilipes and Sesarmops imperator .

Figures

FIGURE 4. Colour photos of recently preserved crabs (dorsal habitus). A, Parasesarma sanguimanus Li, Shih & Ng, 2019, male, 20.2 by 16.8 mm (ZRC), Kiamba, Saranggani; B, Parasesarma ungulatum (H. Milne Edwards, 1853), male, 18.6 by 16 0 mm (ZRC), Kiamba, Saranggani; C, Sesarmops imperator Ng, Li & Shih, 2020, male, 35.6 by 33.7 mm (ZRC), Mambajao, Camiguin Island; D, Sesarmops mora Li, Shih & Ng, 2020, male, 25.8 by 23.9 mm (ZRC), Maigo, Lanao del Norte; E, Tiomanium indicum (H. Milne Edwards, 1837), male, 42.5 by 36.7 mm (ZRC), Sindangan, Zamboanga del Norte; F, Pseudograpsus crassus A. Milne-Edwards, 1868, male, 34.5 by 30.0 mm (ZRC), Iligan, Lanao del Norte. Scale bars: 10 mm.