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The Genus Amphidelus was found at KBS/LTER, Michigan by Frekman and Ettema (1993), Birney (unpublished data) and Quintanilla Tornel (2006, 2007 or 2008 sampling).
Genus Amphidelus Thorne, 1939
" Diagnosis. Amphidelinae. Relatively large size. Head rounded, not offset. Lip region low. Amphids pocket-shaped, well developed, apertures large transverse slits, fovea broad, deeper than wide; sometimes elongate-conoid; positioned anterior to two head diameters from anterior end, mostly at one head diameter from anterior end. Pharynx relatively short, gradually expanding in its posterior part. Secretory-excretory pore anteriorly located. Females mostly didephic-amphidelphic with reflexed ovaries (except in A dolichurus and A. pusillus); vagina thick-walled and vulva with open lips. Males monorchic with anteriorly directed testis, spicules short with central piece, 5-5 ventral pre-cloacal papillae. Many species are in mosses." N. Smol and A Coomans 2006
“Definition: Alaimoidea. Amphid apertures large, transverse slits or crescents. Amphids broad, deeper than wide; sometimes elongate-conoid. Oesophagus narrow but expanding to terminal swelling. Female gonads paired, opposed, reflexed (except in A. dolichurus and A. pusillus). Spicules short, somewhat sigmoid in A. lemani. Type species: Amphidelus lissus Thorne, 1939” From Goodey, 1963
Smol, N. and A Coomans Order Enoplida. 2006. In: Eyualem Abebe, Traunspurger W., and Andrassy I. (eds) Freshwater Nematodes: Ecology and Taxonomy. CABI Publishing, Cambridge, MA, pp. 225-292
T. Goodey and J.B. Goodey. 1963. Soil and Freshwater Nematodes. Butler and Tanner Ltd, London, Great Britain