Abstract
Tetrapetalonema (T.) colombiensis sp. n., a filarial nematode from the subcutaneous and intermuscular connective tissues of squirrel monkeys (Saimiri sciureus) and tufted ringtail monkeys (Cebus apella) from central Colombia is described. Tetrapetalonema colombiensis is a very small species (male 8 mm, females 11-21 mm), and within the subgenus most closely resembles T. panamensis and T. saimiri in dimensions and in general appearance. It can be distinguished from these species by the following major features: smoothly rounded profile of the anterior extremity; single pair of lateral caudal petals in the male; vagina vera directed immediately posteriad in the female; and a large (295-335 by 4.3-6.7 micron) microfilaria that assumes a gently curved attitude in 2% aqueous formalin preparations (Knott's technique), and which has a conspicuous inner body.
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