PROCAMBARUS (GIRARDIELLA) CURDI, A NEW CRAWFISH FROM ARKANSAS, OKLAHOMA, AND TEXAS (DECAPODA, ASTACIDAE)i ROLLIX D. REIMER Department of Wildlife and Fisheries Sciences, Texas A ir M University, College Station, Texas 77843 Abstract Procambarus (Girardiella) cunii is described from material collected in the Red River drainage of Arkansas and Okla-homa and the Brazos Ri\er drainage of Texas. Its closest affinities are witli Procambarus simulans simidans (Faxon) which occurs in the same drainage systems. While working on the crawfishes of Ar-kansas in 1961-1963 (Reimer, 1964), some crawfishes were collected among which were individuals similar to, yet quite distinct from ProcambaniS simulans simulans ( Faxon, 1884). At the time, only a limited area of the range of Procambarus s. simulans was examined. When a thorough study of the subgenus Girardiella was undertaken ( Rei-mer, 1969a) these individuals were recog-nized as representing a distinct species with an interesting distribution in Arkansas, Okla-homa, and Texas. Procambarus curdi repre-sents the sixth taxon to be assigned to the subgenus Girardiella. Procambarus {Girardiella) curdi new species (Figures 1-9) Cambarus simulans. — Creaser and Orten-burger 1933:42, Fig. 18 (in part). Procambarus simulans simulans. — Reimer 1964:28 (in part), 1969b: 56 (in part). Procambarus A Reimer and Clark, South-western Naturalist (in press). Diagnosis. Rostrum without lateral spines, acumen reduced; areola narrow with two rows of punctations at narrowest part; post-orbital ridges terminating cephalically with-^ A contribution of the Department of Wild-life and Fisheries Sciences, Texas, Agricultinal Experiment Station, Texas A & M University. out spine; cervical spine absent or reduced to small tubercle; brachiostegal spine re-duced; suborbital angle reduced; antennal scale widest at mid-length; palm of chela without beard. First pleopod of Form I male reaching coxopodite of third pereiopod and terminating in four distinct parts: mesial pro-cess noncorneous, subspiculiform, extending beyond other terminal elements; cephalic pro-cess noncorneous, small; caudal process, truncate; lamellated part of caudal process corneous flattened lateromesially, narrow, distal margin rounded; central projection corneous, large, subtriangular, flattened lat-eromesially, slightly longer than caudal pro-cess. Cephalic shoulder rounded. Annulus ventralis subovate; cephalic half with broad V-shaped trough, bordered laterally by tu-berculate prominences; sinus originating at mid-ventral line, running sinistrad, forming sharp arc on sinistral half, running dextrad to midline, bending caudally, terminating before reaching caudal margin. Holotypic Male. Form I. Body ovate. Ab-domen narrower, longer (14.9, 34.5 mm) than thorax (19.9, 14.1 mm). Cephalic sec-tion of telson with four spines in each caudo-lateral corner, outer spine longest. Width, depth of carapace subequal in region of caudodorsal margin of cervical groove. Areola narrow (15.7 times longer than wide) two rows of punctations in narrowest part; sides parallel for short distance. Ce-phalic section of carapace 1.7 times as long as areola ( length of areola 36.89' of entire length of carapace ) . Rostrum excavate above, sides slightly con-vergent, cephalic shoulders broadly rounded, acumen reduced, reaching almost to distal border of penultimate segment of peduncle of antcnnule. Editorial Committee for this Paper: Dr. Horton H. Hobbs, Jr., Senior Zoologist, Department of Invertebrate Zoology, National Museum of Natural History, Washington, D.C. 20506 Dr. Joe B. Black, Professor of Zoology, Department of Biology, McNeese State Uni-versity, Lake Charles, Louisiana 70601 97
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