Californidorus cylindricaudatus
Robbins, 1985
Holotype.  Female: L = 2.07 mm; a = 43.0; b = 4.02; c = 68.1; c' = 0.83; V = 40.7; odontostyle = 92 um; odontophore = 92 um; GR = 40 um; G1 = 124 um; G2 = 358 um; width = 48 um; esoph. = 517 um; tail = 30.5 um; ABW = 35 um; EBL = 212 um; EBW = 28 um; DN = 14.9%; ASVGN = 78.3%.

Female:  Body stout, ventrally curved, "C" shaped when killed.  Lip region about twice as wide as high, rounded, offset.  Amphidial openings and pouches typical of the genus.  Guide ring single, about three lip region widths from anterior end.  Odotostyle long, with base forked at junction with odontophore; base of odontophore expanded, moderately sclerotized.  Nerve ring and expanded basal portion of esophagus typical for genus.  Vulva a transverse slit, one, two, or three ventral pores just posterior to vulva.  Distinct sclerotized "plates" posterior and anterior to vagina.  Anterior genital branch reduced, uterus narrow, sperm not observed, sphincter at uterus terminus, oviduct reduced with ovary absent.  Posterior genital branch reflexed near oviduct-ovary junction, connecting sac extends posterior to junction.  Tail cylindrical, bluntly rounded, hemispherical, smooth, with two latero-dorsal caudal pores.

Male:  None observed.

Juveniles: Typical for the genus.

Type habitat, Type locality and Distribution
Sandy soil from about the roots of elm (Ulmus americana L.) and sweet gum (Liquidambar styraciflue L.) growing on the east bank of the Middle-Fork of the White River, about 50 meters north of the bridge crossing the river approximately 8 km south of Highway 16, Washington County, Arkansas.
Found also about the roots of cane (Arundinaria gigantea (Wat.) Chapm.), silver maple (Acer saccharinum L.), cottonwood (Populus deltoides Marsch.), and sycamore (Platanus occidentalis L.) in the type locality.  Found about the roots of cedar (Juniperus virginiana L.), grape (Vitis sp.) and hackberry (Celtis sp.) near the type locality of C. clavicaudatus on Dick's branch in Johnson County Arkansas.  Also found south of the bridge on Old Missouri Road in Fayetteville, Washington County, Arkansas, about the roots of osage orange (Maclura pomifera (Raf.) Schneid) and wild cherry (Prunus serotina Ehrh.).

Females of C. cylindricaudatus n. sp. differs from: C. pinguicaudatus and C. clavicaudatus n. sp. by its cylindrical tail shape, and a shorter odonostyle; and C. cralleyi n. sp. by its more anterior vulva.

(Description- Robbins, 1985)

DNA Sequences Obtained
Specimen: Collected:
Ark 01 Arkansas