Nannopetalum vespertilio, n. sp.

Figs. 5–7

Types: Male holotype from North Carolina: Henderson Co., Bat Cave, collected in the cave 14 May 1977 by C. Holler (NCMNS).

Diagnosis: A very small species of Nannopetalum, lacking ocelli; the gonopod fimbriae are large and prominent.

Etymology: The species epithet is a noun in apposition, “bat”, and refers to the type locality.

Male holotype: Total length, 3.8 mm; width 0.4 mm. Ocelli absent. Unpigmented. Segmental setae 80% or more of body width, thin and curved; lacking prominent segmental striations; segmental shoulders well­developed, paranota­like. Legpairs three to seven encrassate, pair six the largest.

Gonopods (Fig. 5) with sternal lobes much reduced, shifted laterally; coxae with fimbriations becoming larger distally, eventually forming long, branched process; mesal setal group of three on each side shifted laterally; angiocoxites slender, median process short, acute, lateral process blunt, with two thin apical branches (Fig. 6); colpocoxites much reduced but with large fimbirate branches that appear to be basally fused. Ninth legs (Fig. 7) typical; tenth and eleventh legpairs with coxal glands, otherwise unmodified.

Female unknown.

Distribution: Known only from Bat Cave, an unusual granite fissure cave not located in a karst area.

Notes: It is not at all clear if this species is really troglobitic. It is the smallest known trichopetalid and one of the smallest of all chilognath millipeds.

Nannopetalum fontis, n. sp . Fig. 8

Type: Male holotype and female paratype from Alabama: St. Clair Co., Springville Cave, Springville, collected 31 May 1962 by person or persons unknown (“DZ”) (FSCA).

Diagnosis: Small, eyeless species with complex gonopods, especially the posterior branch; the gonopods have strongly reduced fimbriae.

Etymology: The species epithet is a noun, Latin for “of the spring or fountain,” and refers to the type locality.

Male holotype: Total length, 4.75 mm; width 0.5 mm. Unpigmented; eyeless. Segments without evident lateral striations; segmental shoulders moderately developed. Legpairs 3–6 only slightly enlarged, legpair 7 about equal to legpair 12.

Gonopods (Fig. 8) with reduced coxosternum. Coxae (c) with median group of 2 setae shifted to posterior position, lateral group of 3 setae on prominent shoulders; angiocoxite branch complex (ac), with 4 terminations; anterior fimbriae reduced to a few hardly visible scales. Colpocoxites (cc) simple, large, lobe­like; fimbriate branch not seen. Ninth legs (t9) typical; prefemur with small terminal nubbin. Legpairs 10 and 11 with glands, coxae not modified.

Female paratype: Total length, 4.5 mm; width, 0.5 mm. All somatic characters similar to male.

Distribution: Known only from the type collection.

Notes: The general appearance of members of this species is that of troglobites. In the vial with the type specimens were a female and an immature specimen of Scoterpes . There are no other records of Scoterpes from Springville Cave, and the only species found in the vicinity is S. syntheticum (Shear) . If the presence of a Scoterpes species in Springville Cave can be verified, this would be the first and only known case of syntopy between two troglobitic trichopetalids.