Eremocosta gigas Roewer 1934

Cushing, Paula E., Channiago, Felix & Brookhart, Jack O., 2018, Revision of the camel spider genus Eremocosta Roewer and a description of the female Eremocosta gigas Roewer (Arachnida, Solifugae), Zootaxa 4402 (3), pp. 443-466 : 456-457

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Eremocosta gigas Roewer 1934


Eremocosta gigas Roewer 1934  

Figs. 1D View FIGURE 1 , 2K–N View FIGURE 2 , 3D View FIGURE 3 , 4C View FIGURE 4 , 5D & E View FIGURE 5

Eremocosta gigas Roewer 1932   (nomen nudum): figs. 127a–b. Eremopus gigas ( Roewer 1934)   : Muma 1989: 5.

Not Eremorhax gigas ( Roewer 1934)   : Muma 1951 (misidentified): 48, figs. 32–33. Eremocosta gigas ( Roewer 1934)   : Harvey 2002: 451.

Type material. Male holotype from Tampico, México (SMF). Muma’s 1951 designation was in error and was in fact the description of E. gigasella   which he corrected in 1970 and added the description of E. gigas   at that time. We were able to examine the type.

Other specimen examined. Female (1). (Previously undescribed.) MÉXICO: Durango, Dinamita, N 25.733333°, W 103.666667°, 1328 m elev., 29 July 2005, coll. O. Francke, H. Montaño, J. Ballesteros, C. Durán- Barrón, at night ( IBUNAM +CNAN-Sol00114).

Diagnosis. Eremocosta gigas   male is distinguished by its unique cheliceral shape with a sharp dagger-like fixed finger, a long thin fondal notch, and the presence of an acute distal tooth (MD) on the movable finger ( Fig. 2K View FIGURE 2 , arrow). The female genital operculum is also distinct with tear-drop shaped opercular wings that diverge distally ( Fig. 4C View FIGURE 4 ).

Measurements. Holotype Male. TL 50.0; CL 10.4; CH 7.7; FNL 1.3; FNH 1.0; FFH 2.2; PL 47.0; PMT NA; PT 2.6; PMT 10.3; LI damaged; LIV 50.3; PPL 8.0; A/CP NA; FNL/FNH 1.3,; FFH/FNH 2.2.

Female. TL 47.0; CL 14.0; CH 6.4; PPL 5.7 View Materials ; PL 39.5; PT 2.6; PMT 8.6; LI 28.5   ; LIV 40.5; A/CP 5.5.

Description. Coloration. Male. Overall pale yellow body and appendages. Propeltidium lightly mottled brownish-violet, darker on the anterior margin ( Fig. 5D View FIGURE 5 ). Abdomen dusky.

Chelicera. Male. Typical ventrally located VDC with a thin carina inside the cavity ( Fig. 1D View FIGURE 1 , arrow) similar to E. striata   and E. gigasella   ( Figs. 1E & F View FIGURE 1 ). Fixed finger with no median dentition. Movable finger: prominent MPone tiny MSM-small MM-small MD (the only Eremocosta   to possess a distinct tooth-like MD); MPL prominent ( Figs. 2K & L View FIGURE 2 ; tip of MPL tooth just visible in front of MP in Fig. 2L View FIGURE 2 ). Fondal notch distinct, narrow and rounded, greater than height; height of fixed finger larger than height of fondal notch ( Fig. 2K View FIGURE 2 ). One very tiny RFA in fondal notch and one tiny RFA on ventral side of fixed finger; fondal teeth retrolaterally II, I, III, tiny IV; prolaterally I, III, II, IV ( Fig. 3D View FIGURE 3 ).

Setation. Male. Cheliceral setal pattern, pvd setae typical; mvd a proximal patch of plumose setae. Typical setation of pedipalps. A few scattered bacilli on the coxae of LII and LIII. No scopula or ctenidia.

Coloration. Female. Basically cream-yellow, legs similar but a bit darker. Palp dusky on tarsus and metatarsus, LIV light violet at tibia-femur joint; propeltidium blotchy violet-brown, darker on anterior edge, creamy oval area behind ocular tubercle and smaller ovals on either side ( Fig. 5E View FIGURE 5 ). Abdomen with typical dark, violet brown rectangles on each segment that give the appearance of a stripe; ventral grey-cream.

Chelicera. Female. Chelicera worn but apparently fixed finger: FP-2FSM-FM-FSD-FD. Movable finger: MP (very worn)-MSM if present, worn away-MM ( Figs. 2M & N View FIGURE 2 ). MPL apparently missing but may just be worn away. One large RFA; fondal teeth I, III, II, IV (III almost the same size as I) retrolaterally and prolaterally.

Setation. Female. Typical with inner row of plumose bristle extending from FM on fixed finger to MM on movable finger. A row of thick bacilli on anterior edge of LIII coxa and a row of smaller bacilli on anterior edge LIV coxa.

Genital Operculum. Genital operculum tear-drop shaped with slender anterior arms, posterior wing rounded with inner edge slightly notched posteriorly. No visible pits laterally ( Fig. 4C View FIGURE 4 ).

Distribution. MÉXICO: Veracruz. Biome: Chihuahuan Desert.

Discussion. We place the female from Dinamita, Durango, México in this species because of the overall similarity in body size and color pattern. However, without females collected from the type locality and without males collected from the new site we may find this placement either refuted or supported as more specimens are examined from México.


Instituto de BiIolog�a, Universidad Nacional Aut�noma de M�xico


World Museum Liverpool


Agricultural Development and Advisory Service


Musee de Port Louis


Universidade Federal do Rio de Janeiro














Eremocosta gigas Roewer 1934

Cushing, Paula E., Channiago, Felix & Brookhart, Jack O. 2018

Eremocosta gigas

Muma 1989 : 5

Eremorhax gigas ( Roewer 1934 )

Harvey 2002 : 451