Chanbria plicatus ( Muma 1962 ), 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 : 21

Chanbria plicatus ( Muma 1962) , comb. nov.

( Figs 6K, L , 7G )

Therobates plicatus Muma 1962: 11 . Eremochelis plicatus (Muma) : Muma 1970: 33.

Type material: Holotype male from Mercury, NV, USA, 15 July 1960, coll. Elden Beck ( AMNH) . Allotype female from Mercury, NNV, USA, on 6 July 1960, coll. Elden Beck ( AMNH). Examined male holotype from images, but unable to examine female allotype.

Non-type material examined: USA: Nevada: Churchill Co.: Sand Mountain, 22 miles SE of Fallon, 39.291389, −118.415556, 1–8 July 2011, one ♂, W.B. Warner, Pitfall Trap Array , ASU ( ASU _NoNumber); Soda Lake ~ 1 mile NW Fallon, 39.518885, −118.868331, 23 July 1965, one ♂, T. Briggs; K. Hom; V. Lee, CAS ( CASENT9033966 ); Clark Co. : trail off Calico Basin Road , 36.144061, −115.4088627, 1060 m, 1 June 2021, one ♂, one ♀, E.L. Garcia, DMNS ( DMNS ZA.41887); Lincoln County : Corrola Dunes, ~ 23 miles South US-93 on old Alamo Road, 37.02029, −115.19195, 1006 m, 24 May 2014, one ♂, Zach J. Valois, Wind-blown dune field/high dunes, DMNS ( DMNS ZA.33144); Corrola Dunes, ~ 23 miles South US-93 on old Alamo Road, 37.02029, −115.19195, 1006 m, 24 May 2014, one ♂, Zach J. Valois, Wind-blown dune field/high dunes, DMNS ( DMNS ZA.33145); Mineral Count: junction of Highways 95 and 360, 38.27833, −118.1025, 1340 m, 26 June–20 July 2018, one ♂, one juvenile, M.E. Irwin; G.R. Ballmer, Malaise Trap, CAS ( CASENT9094952 ); Nye County : Mercury in can trap in Rock Valley , 36.633, −116.313, 870 m, 10 July1965, one ♂, M.H. Muma, DMNS ( DMNS ZA.16071) ; Nevada Test Site, Mercury, Jackass Flats , off Jackass Flats Road , 36.63619, −116.0756, 878 m, 30 June 2011, one ♂, P.E. Cushing, DMNS ( DMNS ZA.27726); 12 miles NW Tonopah Crescent Dune, 38.229722, −117.335, 30 April–7 July 2011, one ♂, W.B. Warner, Pitfall Trap Array, ASU ( ASU _NoNumber) .

Diagnosis

Chanbria plicatus can be distinguished from other Chanbria by the distinct mesally folded tip of the male cheliceral FF that forms a concavity on the mesal side and by the presence of a deep, thin, proximally upturned fondal notch. Chanbria plicatus is the only Chanbria species in which the male chelicerae have a fondal notch and flagellar groove. It is also noticeably darker in coloration than C. regalis and C. brookharti .

Measurements

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

Males (n = 5): CL: 4.057 (3.701 –4.739); CH: 1.854 (1.619 – 2.285); FFH: 0.413 (0.378 –0.457); tip of MF to MM: 1.412 (1.294 –1.614); tip of MF to MP:1.487 (1.440 –1.534); PL: 18.114 (16.116 –21.553); LI: 10.671 (9.753 –11.411); LIV: 18.070 (16.159 –20.240); PPW: 3.115 (2.856 –3.744); PPL: 2.240 (2.030 –2.789); TL: 16.713 (14.423 –18.735).

Females (n = 2): CL: 4.969 (4.716 –5.222); CH: 1.702 (1.599 – 1.80531); FFH: 0.555 (0.504 –0.608); tip of MF to MP: 1.7485 (1.695 –1.802); tip of MF to MM: 1.859(1.695 –2.079); PL: 15.096 (14.481 –15.711); LI: 9.239 (8.024 –10.455); LIV: 17.220 (15.442 –18.997); PPW: 3.372 (3.165 –3.578); PPL: 2.175 (2.060 –2.290); TL: 18.382 (17.729 –19.037); GOL: 1.362 (1.359 –1.367); GOW: 0.700 (0.643 –0.756); GOD: 1.518 (1.515 –1.523).

Redescription: males

Coloration: Dorsally sandy brown, ventrally light tan. Femurs and tarsi uniform sandy brown, tibiae lighten proximally. Propeltidium with darker anterior margin. Cheliceral manus sandy brown with lighter margins. FF and MF darken distally.

Chelicera: FF with distinct tip that folds over to the flagellar groove ( FG) on mesal side. Height of FF greater than in other Chanbria . FF lacks dentition. Dorsal margin of the FF is shaped like an elongate, sigmoidal wave. The proximal tooth on MF is large, prominent, slightly recurved. distal teeth on MF present in each specimen but highly reduced, with fondal notch deep, thin, upturned dorsally. Fondal teeth prominent, with tooth I in both ectal and mesal row longest. Shape of cheliceral manus is unique among Chanbria species, being less dorsoventrally compressed and with a more prominent dorsal hump from base of FF and subsequently tapering near posterior portion of manus.

Redescription: females

Coloration: Same as in males.

Chelicera: FF with seven teeth, with formula FD- 2FSD-FM-2FSM-FP. Moveable finger with four teeth. MP tooth is largest, followed by MM tooth, with two smaller MSM teeth between them. A diastema, a wide gap between two teeth, exists between first and second fondal tooth in each row.

Operculum: Opercular plates in the shape of elongate tapered lobes. Plates are tapered anteriorly and lobed posteriorly.

Distribution

Nevada, USA. Mojave Basin and Range (Great Basin) Province , occurring on the east side of the Colorado River.

Discussion

This species is similar in size and has dark pigmentation on the propeltidium, pedipalps, and legs, as in C. serpentinus . Collection records indicate that this species has affinities to dune-like or sandy habitats in the Mojave Basin and Range. Owing to the similarities in habitat preference, dense setation on pedipalps, strongly procurved MF in males, and elongated chelicerae in females, we suggest that Eremochelis plicatus Muma, 1962 should be moved into Chanbria as Chanbria plicatus . This new combination is strongly supported by phylogenomic and morphological evidence, and this species is likely to be the earliest diverging member of Chanbria .

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.