Eremocosta 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 : 445-446

publication ID

publication LSID


persistent identifier

treatment provided by


scientific name

Eremocosta Roewer 1934


Genus Eremocosta Roewer 1934   .

Eremopus Roewer 1934: 561   [Junior homonym of Eremopus Brady 1910   (Crustacea, Copepoda)], Muma 1989: 4. Eremocosta Roewer 1934: 569   (synonymized by Muma 1951: 41).

Eremocantha Roewer 1934: 571 (synonymized by Muma 1970: 9).

Type species. Of Eremopus   : Eremopus montezuma Roewer 1934   , by original designation. Of Eremocosta   : Eremocosta gigas Roewer 1934   , by original designation. Of Eremocantha: Eremocantha robusta Roewer 1934   , by original designation.

Revised diagnosis. Eremocosta   species are relatively large; ranging from 26 to 50 mm in length. Color patterns of the body and pedipalps are variable. The diagnostic synapomorphy of Eremocosta   is the male fixed finger with a deep VDC ( Figs. 1A–G View FIGURE 1 ). Neither Roewer (1934) nor Muma (1951, 1970) described the carina running inside this cavity that is evident in some species ( Figs. 1B–F View FIGURE 1 , arrows). The fixed finger of males lacks median dentition ( Fig. 2 View FIGURE 2 ). The movable finger of males has a large MP, one to two MSM, and one MM teeth ( Fig. 2 View FIGURE 2 ). The MP tooth is large and distinct. In E. gigas   , E. gigasella   , and E. striata   the movable finger has what we here call a distal tooth of the movable finger (MD) ( Figs. 2K, O & S View FIGURE 2 , arrows). The fondal notch ranges from obscure to distinct ( Fig. 2 View FIGURE 2 ), and ordinarily has two to four RFA in the fondal notch and in some species one to three RFA on the ventral side of the fixed finger ( Fig. 3 View FIGURE 3 ). Pro- and retrolateral fondal teeth vary in gradation among the species ( Fig. 3 View FIGURE 3 ). The retrolateral IV is tiny in some species. Male cheliceral setal formation (sfc) consists of tubular setae dorsally, two rows of tubular setae prolaterally with the inner mesal row being plumose and extending dorsally to and sometimes above fondal tooth I. The prodorsal setae (mpd) consist of a proximal patch in all species except E. gigasella   which has a linear row extending to MM. The proventral distal setae (pdp) consist of three robust setae and one proximal thin seta. The female chelicera fixed finger has a large FP, one to two FSM, a large FM, small FSD, and distinct FD ( Fig. 2 View FIGURE 2 ). The female movable finger has a large MP, one or two MSM, and one MM teeth. MPL tooth distinct on males and females ( Fig. 2 View FIGURE 2 ). Eremocosta   females demonstrate typical eremobatid female cheliceral setal pattern with pvd and mpd setae forming a continuous plumose row from the FD to the MM teeth. The arms of the genital operculum of Eremocosta   are alate and widely separated posteriorly ( Fig. 4 View FIGURE 4 and Muma 1989). The genital operculum is largely species-specific with some possessing thin arms with club like wings; others recurved, bent laterally at their posterior ends with no distinct external pits. No palpal papillae or ctenidia are present.


Marine Science Museum, Tokai Univ.


Universidade Federal do Rio de Janeiro


Musee de Port Louis












Eremocosta Roewer 1934

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


Roewer 1934 : 561
Muma 1989 : 4
Roewer 1934 : 569
Muma 1951 : 41