Chanbria mapemes Garcia & Castillo, 2024

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 : 20

Chanbria mapemes Garcia & Castillo sp. nov.

( Figs 6O, P , 7H , 9 )

urn:lsid:zoobank.org:act:203EC990-AF19-4255-BA04-3C8B09DBE62D

Type material: Male holotype ( IBUNAM CNANSO106 ) from Sierra Mojada , Coahuila, México. Paratypes and allotypes (one ♂, two ♀) from the same locality, collected on the same date by D. Sissom, E. González-S., B. Hendrixon, S. Grant. Type and paratype material deposited at the Instituto de Biología, Universidad Nacional Autónoma de México ( UNAM) arachnology collection with the accession numbers CNAN-T01867 (holotype) and CNAN-T01868 (paratypes). Specimens were examined by the third author and photographs by the other two.

Etymology

This species epithet is inspired both by the indigenous Cocoyome word ‘mapeme’, meaning high rock or elevated hill, and by the Bolsón de Mapimí, a large internal basin surrounded by lower-elevation mountain ranges ( Facio García, 2020). This basin is in the northwest of the Mexican Plateau, from which the type and paratype species were collected. The Cocoyome tribe was once a distinct indigenous group that inhabited this desert basin in present-day México.

Diagnosis

Chanbria mapemes is morphologically distinguished from the other Chanbria by not having the characteristic sigmoidshaped FF as in C. regalis and C. serpentinus males. Instead, this species possesses an FF that is elongate, thin, and is virtually uniform in height along the extent of the length of the finger, except where it tapers towards the tip. Tip of FF is constricted. There are six teeth present on FF. Moveable finger, medial tooth (MM) is large and a similar size to the moveable finger, proximal tooth (MP), whereas in the other species it is reduced or absent. The geographical location of this species is remote from the other type localities and is the southernmost record for the genus.

Measurements

Male holotype: CL: 5; CH: 1.64; FFH: 0.3; tip of MF to MM: 1.42; tip of MF to MP: 1.84; PL: 15.13; LI: 12.3; LIV: 18.75; PPW: 3.2; PPL: 2.05; TL: 17.75.

Male paratype: CL: 4.45; CH: 1.4; FFH: 0.3; tip of MF to MM: 1.04; tip of MF to MP: 1.72; PL: 15.13; LI: 12.3; LIV: 18.75; PPW: 3.2; PPL: 2.05; TL: 14.88.

Female allotypes (2): CL: 4.15, 4.05; CH: 1.58, 1.55; FFH: 0.38, 0.2; tip of MF to MM: 1.02, 0.76; tip of MF to MP: 1.46, 1.20; PL: 11.65, 11.1; LI: 10.25, 9.4; LIV: 14.14, 13.2; PPW: 2.8, 2.75; PPL: 1.65, 1.25; TL: 13.875, 18.875.

Description: males

Coloration: Overall coloration is light beige with dark pigmentation. Propeltidium is predominantly dark, with anterior margins with dark pigmentation, light coloration in the centre that darkens distally towards the edges. Pedipalps are almost entirely dark, except for a light-coloured patch at the proximal end. Cheliceral manus uniform in coloration. FF and MF darken distally into a red-orange towards the tip. Legs I and II have no pigmentation. Legs III and IV have dark pigmentation on the distal ends of femora and proximal ends of metatarsi.

Chelicera: FF is long, slim, and nearly uniform in height. Tip of FF terminates in a sharp curved tip and is constricted, with a prominent indentation on the ectal side of the structure. Narrow line of stout setae on the mesal side of the FF along most of the length. Dentition present on FF, with six distinct teeth starting from the FP to FD. MF dentition is like that of C. brookharti , such that the MSD are triangular and there are MST present; however, the difference is that the MM is larger than any of the Chanbria species, and it is also slight recurved. Manus is ovoid like C. brookharti , with more of a dorsal hump, but less than that observed in the other species.

Pedipalp: Pedipalps are dark, with light coloration at the proximal end. Enlarged, moveable palpal spines are also present on the ventral side, as in C. brookharti . Papillae present in the males examined.

Ctenidia: Four ‘stiletto-like’ abdominal ctenidia.

Description: females

Coloration: Same as males.

Chelicera: Entire chelicerae are elongate and dorsoventrally slender. FF tooth formula is as follows: FST-FD-2FSD-FM-2FSM-FP, with seven principal teeth, not counting the teeth before the FD. Moveable finger dentition has four principal teeth, with the tooth formula MST-MM-2MSM-MP. Tips of chelicerae and tips of teeth darken at tips.

Operculum: Genital plates are scalene triangle shaped, with nearly horizontal sides at the posterior. The lateral side of opercula is the longest of the three sides.

Distribution

Chihuahuan Desert, Mexican plateau.

Discussion

Thisspeciesisanother Chanbria thatisendemictotheChihuahuan Desert; however, this species is the southernmost record for the genus thus far. Owing to the remote location, which is in a basin between two mountain ranges, coupled with the distinct morphology in comparison to the other species, we believe this evidence favours elevating this specimen to new species status.

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.

Figure 9. Chanbria mapemes male holotype (IBUNAM CNANSO106). A, dorsal view of propeltidium. B, retrolateral view of right pedipalp. C, ventral view of abdominal ctenidia. D, habitus dorsal view, with no scale bar available.Scale bars: 1 mm.