Body tapers only slightly at each end, presenting a bluntly-truncate shape anteriorly and posteriorly. Lip region with two annules definitely set off from succeeding body annules. First annule narrower (about 17 u wide) and thinner than second annules (25 u wide) and closely surrounding sublateral lobes and labial disc. Both first and second annules rounded, not retrorse. Labial disc prominent, projecting forward beyond outline of rest of head. Amphids two small oval openings lateral and close to labial disc. Sublateral lobes strongly developed, obvious in laterla view, arranged in two pairs dorsal and ventral to labial disc. Lobes of each pair connect with each other as illustrated. Second annule bears a notch in one of the lateral edges. Succeeding annules gradually increase in width (31 u, 36 u, etc.) and thickness (8 u, 10 u . etc.,) ranging from 8.0-14.5 u over length of body. Annules have a rounded outline only slightly retrorse on some specimens. Cuticle very thick, about 3.o-3.5 u. Stylet long and robust, knobs about 13 u across. Metacorpus, isthmus and posterior bulb noticeably elongate. Excretory pore and canl prominent and easily seen in 19th (18th-20th on other paratypes) annule, 187 u (205-295) from anterior end. Anastomosis rare, no markings on lateral field and edges of annules smooth. Gonad outstretched 59% (46-58) of body length. Spermatheca indefinite, no spermatozoa observed. Vulva on 6th annule from terminus (on one specimen between 5-6th and on another between 6th -7th), opening a simple oval in outline. Anus on 3rd annule from terminus (between 2nd-3rd and on 4th, respectively of above two specimens). Bluntly rounded tail end with coarse, rounded and 2-3 lobed button (or in some specimens a single, rounded terminus).
Larvae: Body outline and lip region much resemble adult female, except lip annules are finer and more widely set off. Stylet robust. Esophagus elongate as in female. Annules bear 16-18 rows of prominent spine-like projections. These present a continuous and irregular outline, each row contiguous with the adjacent ones. Each spine broad at base narrowing abruptly near tip forming a nipple-like projection rounded at the very tip.
Type host: Soil about roots of maple tree.
Type locality: Emigration Canyon, about 20 miles east of Salt Lake City, Utah, elevation between 7,000-8,000 ft.
Diagnosis: This species in most closely related to C. bakeri but differs in the shorter tail of incrassatus (c = 36-65 vs. 19-29 for bakeri); in the location of vulva and anus (5th-7th and 2nd-4th annules respectively from terminus for incrassatus vs. 8th-10th and 5th-6th respectively for bakeri); in total body annules (55-62 for incrassatus, 70-79 for bakeri). It is also related to C. informe but differs in the larger stylet (90-106 u for incrassatus, 58-64 for informe); greater total length (0.59-0.80 mm vs. 0.33-0.48 mm); smaller, more discrete sublateral lobes of incrassatus vs. larger less definitely set off sublateral lobes in informe. Also the larvae of incrassatus have prominent spines arranged in rows, whereas in informe the annules of larvae have crenate edges. This species also keys to annulatum and or hercyniensis but differs from both in the fewer annules of incrassatus (55-62 vs. 113-128 for hercyniensis and 123-149 for annulatum).
(Description- Raski & Golden, 1966)