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Redescription of a Philippine endemic freshwater calanoid copepod, Pseudodiaptomus brehmi Kiefer, 1938 (Copepoda, Calanoida, Pseudodiaptomidae)

In: Crustaceana
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  • 1 The Graduate School, College of Science, University of Santo Tomas, España Boulevard, Manila 1015, Philippines
  • | 2 National Museum of Natural History, Smithsonian Institution, Washington, D.C., U.S.A.
  • | 3 Research Center for Natural and Applied Sciences, College of Science, University of Santo Tomas, España Boulevard, Manila 1015, Philippines
  • | 4 Department of Biological Sciences, College of Science, University of Santo Tomas, España Boulevard, Manila 1015, Philippines
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Abstract

The genus Pseudodiaptomus is represented by 19 species in Philippine coastal waters. Of all these species found in the Philippines, P. brehmi Kiefer, 1938 is the only known truly freshwater pseudodiaptomid endemic to this country, which was originally described from Lake Naujan, Mindoro Island. After numerous attempts to find it in its type locality, we concluded that the former is no longer extant in this lake and has now been displaced by the invasive Neotropical calanoid Arctodiaptomus dorsalis (Marsh, 1907). Sampling in Lake Taal, on the nearby island of Luzon, resulted in the surprise discovery of P. brehmi populations coexisting with A. dorsalis. This rediscovery of P. brehmi in Lake Taal and its absence from its type locality, necessitate this report as well as the species’ morphological redescription.

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