Freshwater microcrustaceans (Cladocera: Anomopoda and Ctenopoda, Copepoda: Cyclopoida and Calanoida) in the highly urbanized Metropolitan Manila area (Luzon, Philippines) Author Dela Paz, Erica Silk P. Author Lopez, Mark Louie D. Author David, Christian Irvin Harvey A. Author Dela Cruz, Dave Ryan A. Author Viernes, Gian Alfonso A. Author Wong, Jac Fritgerald Author Papa, Rey Donne S. text Check List 2018 2018-09-14 14 5 751 762 http://dx.doi.org/10.15560/14.5.751 journal article 10.15560/14.5.751 1809-127X Arctodiaptomus dorsalis (Marsh, 1907) Materials examined. Philippines : Luzon: Manila : Pasig River ( 14.5604° N , 121.0659° E ), coll. DRA Dela Cruz, GAA Viernes, JF Wong, ESP Dela Paz and ML Lopez, June 2016 ( UST-ZRC 0253A–B, USTZRC 0254, USTZRC 0255A–B, and USTZRC 0256A–B, 4 spec. ). Short description. The body is generally elongated with a long antennule that generally reaches the tip of the urosome. Male specimen: antennule is geniculated. Right exopodite 2 of P5 leg is relatively large and bears a long, thin, and strongly curved terminal claw on the posteromedian area; and with a short lateral spine protruding near the middle of exopodite 2. Female specimen: antennule is straight. The pair of P5 is symmetrical. All the morphological characteristics concur with the descriptions and illustrations of Dussart and Defaye (2001) and Papa et al. (2012) . Ecological distribution. Arctodiaptomus dorsalis is found in lakes and rivers. This species is an invasive copepod hence that can tolerate eutrophic condition ( Papa et al. 2012 ).