Ptychognathus riedelii (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 : 315

publication ID	https://doi.org/10.11646/zootaxa.4868.3.1
publication LSID	lsid:zoobank.org:pub:9C2F00BA-3400-4FB6-ABC2-0525B5E64696
DOI	https://doi.org/10.5281/zenodo.4443622
persistent identifier	https://treatment.plazi.org/id/8D6787D9-FFA9-FFC5-FF6D-3AD2FEB2F98D
treatment provided by	Plazi (2021-01-05 00:54:34, last updated 2024-11-29 11:35:55)
scientific name	Ptychognathus riedelii (A. Milne-Edwards, 1868 )
status

Treatment

Ptychognathus riedelii (A. Milne-Edwards, 1868) View in CoL

Fig. 5C View FIGURE 5

Ptychognathus riedelii, Ward 1941: 2 View in CoL .

Material examined. 10 males, 28.1 by 25.4 mm—29.9 by 26.1 mm ( ZRC; NJL160503–12 ), Layawan River, Brgy. Toliyok, Oroquieta town , Misamis Occidental prov., coll. N.J. Lagare, 16 Sep. 2016 ; 3 males, 19.5 by 17.5 mm—20.1 by 18.5 mm ( ZRC; NJL160834–36 ), Brgy. Dalipuga , Iligan town, Lanao del Norte prov., coll. N.J. Lagare, 19 Sep. 2016 ; 7 males, 13.9 by 12.5 mm—19.9 by 18.9 mm, 13 females, 14.8 by 13.7 mm—20.1 by 17.3 mm ( ZRC; NJL160901–20 ) Brgy. Tagbalogo, Naawan town , Misamis Oriental prov., coll. N.J. Lagare, 12 Sep. 2016 ; 1 male, 25.1 by 22.1 mm ( ZRC; NJL182540 ) Brgy. Tikulon, Malita town, Davao Occidental prov. , coll. N.J. Lagare, 18 & 19 Oct. 2018 ; 3 males, 17.7 by 16 mm—21.1 by 18.4 mm, 2 females, 16.5 by 14.5 mm, 15.7 by 14.1 mm, Don Marcelino town, Davao Occidental prov. , coll. E.F. Mapi-ot, 2018 .

Remarks. Ptychognathus riedelii (A. Milne-Edwards, 1868) (type locality: Sulawesi, Indonesia) is widely distributed within the islands of Indonesia ( Flores, Sumatra, and Halmahera), as well as in the Andaman Is. ( Holthuis 1978; Cai & Ng 2001). In the Philippines, P. riedelii has been reported from the Davao Gulf by Ward (1941). The present specimens agree well with the description and illustrations provided by Cai & Ng (2001: 686, fig. 16), and this species is now known to be locally common in northern and southern Mindanao as well (see Table 1). The specimens were collected in small freshwater rivers & streams at depths of less than 1 m, among stones and pebbles in the substrate.

References

Cai, Y. & Ng, P. K. L. (2001) The freshwater decapod crustaceans of Halmahera, Indonesia. Journal of Crustacean Biology, 21 (3), 665 - 695. https: // doi. org / 10.1163 / 20021975 - 99990167

Holthuis, L. B. (1978) A collection of decapod crustaceans from Sumba, Lesser Sunda Islands, Indonesia. Zoologische Verhandelingen, 162, 1 - 55.

Milne-Edwards, A. (1868) Etudes zoologiques sur quelques crustaces des iles Celebes provenant d'un envoi de M. Riedel. Nouvelles Archives du Museum d'Histoire Naturelle, Paris, 4, 173 - 185, pls. 26 + 27. https: // doi. org / 10.5962 / bhl. title. 10260

Ward, M. (1941) New Brachyura from the Gulf of Davao, Mindanao, Philippine Islands. American Museum Novitates, 1104, 1 - 15.

Figures

FIGURE 5. Colour photos of recently preserved crabs (dorsal habitus). A, Ptychognathus altimanus (Rathbun, 1914), male 21.1 by 19.9 mm (ZRC), Tagoloan, Misamis Oriental; B, Ptychognathus pusillus Heller, 1865, male, 13.1 by 10.7 mm (ZRC), Tagoloan, Misamis Oriental; C, Ptychognathus riedellii (A. Milne-Edwards, 1868), male, 28.9 by 25.0 mm (ZRC), Oroquieta, Misamis Occidental; D, Pyxidognathus granulosus A. Milne-Edwards, 1879, female, 15.4 by 17.3 mm (ZRC), Maigo, Lanao del Norte; E, Utica gracilipes Adams & White, 1848, male, 24.2 by 22.8 mm (ZRC), Iligan, Lanao del Norte; F, Varuna litterata (Fabricius, 1798), male, 42.1 by 37.5 mm (ZRC), Dapitan, Zamboanga del Norte.G, Austruca perplexa (H. Milne Edwards, 1852), male, 13.9 by 10.6 mm (ZRC), Tagoloan, Misamis Oriental; H, Ocypode ceratophthalmus (Pallas, 1772), male, 30.8 by 27.8 mm (ZRC), Manukan, Zamboanga del Norte. Scale bars: 10 mm.