A class of nematodes possessing lateral canals opening into the excretory system and phasmids; it includes most of the familiar nematode parasites of humans and domestic animals, including the soil-borne nematodes, strongyles, and filiariae. SEE ALSO: Adenophorasida. SYN: Phasmidia, Secernentia. [L. secerno, to separate, hide]

Medical dictionary. 2011.

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  • phasmid — 1. One of a pair of caudal chemoreceptors seen in nematodes of the class Secernentasida (Phasmidia). 2. Common name for a member of the class Phasmidia, now Secernentasida. * * * phas·mid fas mid n …   Medical dictionary

  • Adenophorasida — A class of nematodes lacking lateral canals opening into the excretory system and phasmids, with few or no caudal papillae, eggs unsegmented, and with polar plugs or hatching in utero. It includes the genera Trichuris, Capillaria, and Trichinella …   Medical dictionary

  • Phasmidia — SYN: Secernentasida. [G. phasma, appearance] * * * Phas·mid·ia faz mid ē ə n pl a subclass of Nematoda comprising worms having typically papillose sensory organs, phasmids, lateral cervical papillae, and simple lateral sensory depressions at the… …   Medical dictionary

  • Secernentia — SYN: Secernentasida …   Medical dictionary

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