ecomii - a better way
June 20, 2018  |  Login

An order of nematodes in which the amphids are simple spirals that appear as elongate loops, shepherd's crooks, question marks, or circular forms. The cephalic sensilla are often separated into three circlets: the first two are papilliform or the second coniform, and the third is usually setiform; rarely are the second and third whorls combined. Body annulation is simple. The stoma is anteriorly funnel shaped and posteriorly tubular; rarely is it armed. Usually the esophagus ends in a bulb that may be valved. In all but a few taxa the females have paired gonads. Male preanal supplements are generally tubular, rarely papilloid.

There are three araeolaimid superfamilies: Araeolaimoidea, Axonolaimoidea, and Plectoidea. The distinguishing characteristics of the Araeolaimoidea are in the amphids (sensory receptors), stoma, and esophagus. The amphids are in the form of simple spirals, elongate loops, or hooks. Although araeolaimoids are chiefly found in the marine environment, many species have been collected from fresh water and soil.

The amphids in the Axonolaimoidea are generally prominent features of the anterior end, visible as a single-turn loop of a wide sausage shape. Feeding habits are unknown. All known species occur in marine or brackish-water environments.

Plectoidea comprise small free-living nematodes, found mainly in terrestrial habitats, frequently in moss; some are fresh-water, and a few are marine. Those that inhabit moss cushions can withstand lengthy desiccation. For most, the feeding habit is unconfirmed; where it is known, they are microbivorous. Many are easily raised on agar cultures that support bacteria. Nemata

 Back to all terms
From McGraw-Hill Concise Encyclopedia of Environmental Science. The Content is a copyrighted work of McGraw-Hill and McGraw-Hill reserves all rights in and to the Content. The Work is © 2008 by The McGraw-Hill Companies, Inc.
ecomii featured poll

Vote for your Favorite Charity



ecomii resources
ecomii Tips Newsletter 

Sign up today to receive a weekly tip for living greener

Get in Touch

Got suggestions? Want to write for us? See something we could improve? Let us know!