Chanbria serpentinus Muma, 1951

Garcia, Erika L., Hansen, Quincy G. & Castillo, Jaír R., 2024, A phylogenomic approach to a taxonomic revision: a combination, new synonymies, and a description of two new species within the camel spider genus Chanbria Muma, 1951 (Solifugae: Eremobatidae), Zoological Journal of the Linnean Society 202 (4), pp. 1-25 : 18-19

Chanbria serpentinus Muma, 1951

( Figs 6I, J , 7E, F )

Type material: Male holotype from Tucson, AZ, USA ( AMNH). Examined .

Other material examined: USA: Arizona: Pima Co.: Posta Quemado Canyon 8 miles N Vail, came to UV light, 32.0543°N, 110.634°W, 1045 m, 30 May 1968, one ♀, F. Werner, DMNS ( DMNS ZA.17735); Catalina State Park , 32.42445°N, 110.92271°W, 822 m, 27 April 2011, one ♂, P.E. Cushing; G. Selby, At Lights, DMNS ( DMNS ZA.26433); Catalina State Park ; Campsite A and B, 32.42445°N, 110.92271°W, 822 m, 4 June 2011, one ♀, P.E. Cushing; P. Casto; B.E. Trierweiler; C.G. Olds, Lantern Light, DMNS ( DMNS ZA.26852); 4020 S Via del Pica Maderos, 31.8542°N, 110.9937°W, 886 m, 13 July 2011, one ♀, W.R. Savary, Casual, DMNS ( DMNS ZA.28202); Catalina State Park , campsite A and B, 32.42445°N, 110.92271°W, 822 m, 6 Jun 2011, one ♂, C. Ho, Casual, DMNS ( DMNS ZA.17648); Catalina State Park Campgrounds A and B; 32.42630 −110.92372, 32.4263°N, 110.92372°W, 825 m, 13 June 2018, five ♂, two ♀, P.E. Cushing; F. Channiago; L. Herrera; R.R. Jones, At lights, DMNS ( DMNS ZA.38728); Catalina State Park Campgrounds A and B, 32.4263°N, 110.92372°W, 825 m, 13 June 2018, one ♂, P.E. Cushing; F. Channiago; L. Herrera; R.R. Jones, At lights, DMNS ( DMNS ZA.38729); Catalina State Park Campgrounds A and B, 32.4263°N, 110.92372°W, 825 m, 12 July 2018, one ♂, P.E. Cushing; F. Channiago; L. Herrera; R.R. Jones, At lights, DMNS ( DMNS ZA.38833); La Paz County : Ehenberg, Comber Boulevard at Colorado River , 33.61639°N, 114.52361°W, August 1974, one ♀, W.B. Warner, ASU ( ASU _NoNumber) .

Diagnosis

Chanbria serpentinus can be distinguished from other Chanbria species by the male chelicerae with an elongate sigmoidally shaped FF lacking dentition. It is also noticeably darker and smaller in overall body size compared with the geographically close species, C. regalis .

Measurements

All measurements are reported as averages, and ranges are in parentheses.

Males (n = 9): CL: 6.153 (5.164 –7.829); CH: 2.03761 (1.641 – 2.589); FFH: 0.555 (0.443 –0.694); tip of MF to MM: 1.658 (1.351 –2.05606); tip of MF to MP: 2.262 (1.544 –2.994); PL: 23.914 (20.800 –29.217); LI: 12.980 (10.667 –15.665); LIV: 21.755 (18.133 –27.282); PPW: 3.957 (3.2–5.319); PPL: 2.797 (2.135 –3.689); TL: 22.275 (18.4–27.840).

Females (n = 4): CL: 5.710 (5.171 –6.498); CH: 1.957 (1.761 – 2.205); FFH: 0.636 (0.543 –0.685); tip of MF to MD: 1.197 (0.925 –1.386); tip of MF to MP: 1.969 (1.758 –2.143); PL: 18.067 (15.916 –19.733); LI: 10.584 (8.236 –12.110); LIV: 19.360 (17.404 –21.312); PPW: 2.577 (2.397 –2.839); PPL: 3.701 (3.2–4.271); TL: 21.094 (19.385 –24.933); GOL: 1.275 (1.122 –1.499); GOW: 1.0547 (0.856 –1.358); GOD: 1.681 (1.415 –1.985).

Redescription: males

Coloration: Overall coloration sandy brown. Appendages darken distally near ends of tibiae and tarsi. Propeltidium with darker lateral margins. Cheliceral manus darkens proximally.

Chelicera: FF is sigmoidal, lacks dentition. Four teeth are present on MF. MP tooth largest, prominent, and recurved, followed by MM tooth, then posterior MSM tooth. Fondal notch absent. Fondal teeth reduced.

Redescription: females

Coloration: Coloration as in males.

Chelicera: FF with eight or nine teeth, formula FD-2FSD-FM-3FSM-FP or FD-3FSD-FM-3FSM-FP. Moveable finger with four teeth. MP tooth largest, followed by MD tooth, with two smaller MSD teeth between them.

Operculum: Two morphologies were observed in the opercular plates of C. serpentinus females. One is like those observed in some C. regalis females, with rounded plates that resemble scalene triangles, and the other consists of more broadly lobate plates with tapered anterior edges.

Distribution

Sonoran Desert. This species is apparently restricted to the eastern side of the Colorado River.

Discussion

Chanbria serpentinus females are nearly identical to C. regalis females, with C. serpentinus being distinguishable from C. regalis by the smaller size, darker coloration, and geographical location. Like C. regalis , the genital opercula of C. serpentinus females are intraspecifically variable and therefore not wholly informative for species identification.

Figures

Figure 6. Ectal and mesal views of male Chanbria species chelicerae coloured by the revised species designations. A–H illustrate the morphological variation found in Chanbria regalis. A, B, ectal view (A) and mesal view (B) of male DMNS ZA.16460 from Salton Sea,

Figure 7. Ventral views of Chanbria female genital operculum according to the new species designations. A–D show the intraspecific variation of Chanbria regalis.A, DMNS ZA.28409 from Twentynine Palms in San Bernardino County County, CA, USA. B, DMNS ZA.17213 Coachella Valley, Riverside County, CA, USA.C, DMNS ZA.29497 8.5 miles east of Twentynine Palms, San Bernardino County, CA, USA. D, DMNS ZA.44238 Punta Final, Baja California, Mexico. E, F represent the intraspecific variation of Chanbria serpentinus from the same locality (DMNS ZA.38728) from Catalina State Park Campground, Pima County, AZ, USA. G, Chanbria plicatus (DMNS ZA. 41887) off Calico Basin Road, Clark County, NV, USA. H, Chanbria mapemes IBUNAM CNANSO106 from Sierra Mojada, Coahuila, Mexico.Scale bars:1 mm.