Type Material

 

            Holotype: “Male holotype from Phantom Canyon, Fremont Co., Colo. June 24, 1964, in the AMNH. Female allotype from same locality, June 30, 1964, also in the AMNH” (Muma & Brookhart, 1988, p. 17).

 

            Measurements: “Males (6) somewhat variable in size; CP varies from 8.8-10.3 (mean 9.7). Legs long; A/CP varies from 6.1-6.6 (mean 6.4). Ctenidia long and flat, varying in number from 1-2 (mean 1.7) (fig. 47). Three specimens had ctenidia longer than ½ width of succeeding abdominal segment, 1 had ctenidia shorter than ½ the width. Males have a small to medium sized mesal tooth on the movable cheliceral finger” (Muma & Brookhart, 1988, p. 18). 

“Females (8) also somewhat variable in size; CP varies from 10-12.8 (mean 11.2). Legs short; A/CP varies from 4.6-5.3 (mean 5.1). Females have either an indistinct or small mesal tooth on movable cheliceral finger; mode small. Opercula with anterior lobes toothed or undulate mesally; opercular notches occupying 35-45% of opercula (mean 39) (figs. 48-49)” (Muma & Brookhart, 1988, p. 18). 

 

            Ctenidia Description: Males are distinguishable by 2 long, flat ctenidia; with one of five examined specimens lacking ctenidia (Muma & Brookhart, 1988).

            

            Operculum Description: “Females distinguished by apically rounded anterior lobes of opercula, angular straight or lightly concave lateral margins of posterior opercular notch, and narrow, weakly crescentic, vulvular opening” (Muma & Brookhart, 1988, p. 17).

            

            Chelicerae Description: “Males…frequent lack of anterior intermediate tooth, and laterally distinct ventral notch of movable cheliceral finger…one specimen also had an anterior intermediate tooth on movable cheliceral finger. The ventral notch of movable cheliceral finger always distinct from ecto-lateral view and becomes more distinct if chelicera is rotated ventrally. Dorsal process of fixed finger peaked over basal half of fondal notch” (Muma & Brookhart, 1988, p. 17).

 

Diagnosis:

 

Other Information: “This species has no known close relatives within the group and series” (Muma & Brookhart, 1988, p. 18).