Cosmocercoides is a genus of nematode within the order Ascaridida. Nematodes within the genus Cosmocercoides have been found as parasites within the rough-skinned newt, Taricha granulosa. Cosmocercoides includes the following species:
- Cosmocercoides barodensis <small>Rao, 1979</small>
- Cosmocercoides bufonis <small>Karve, 1944</small>
- Cosmocercoides dukae <small>(Holl, 1928)</small>
- Cosmocercoides fotedari <small>Arya, 1992</small>
- Cosmocercoides kumaoni <small>Arya, 1992</small>
- Cosmocercoides lanceolatus <small>Rao, 1979</small>
- Cosmocercoides multipapillata <small>Khera, 1958</small>
- Cosmocercoides nainitalensis <small>Arya, 1979</small>
- Cosmocercoides pulcher <small>Wilkie, 1930</small>
- Cosmocercoides rickae <small>Ogden, 1966</small>
- Cosmocercoides rusticum <small>(Kreis, 1932)</small>
- Cosmocercoides skrjabini <small>(Ivanitskii, 1940)</small>
- Cosmocercoides speleomantis <small>Ricci, 1988</small>
- Cosmocercoides tibetanum <small>Baylis, 1927</small>
- Cosmocercoides tridens <small>Wilkie, 1930</small>
- Cosmocercoides variabilis <small>(Harwood, 1930)</small>
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