Abstract
This new species (type locality, Conchas Reservoir, San Miguel Co., New Mexico) is being named Orconectes causeyi in honor of Dr. David Causey. Description is based on holotype, morphotype, allotype, and 40 paratypes. Types and paratypes are deposited at U. S. National Museum and Tulane University. Additional known specimens are annotated. Origin, distribution, ecology, life history, and relationships are discussed briefly. The species is known from Arkansas, Rio Grande, and Colorado River drainages; spanning the Continental Divide. This new species is being named in honor of Dr. David Causey, Emeritus Professor of Zoology, University of Arkansas. I am especially indebted to Dr. Causey for training in ecology and invertebrate zoology and for countless instances of advice and encouragement. It is with pleasure that I name this new species for him as a small token of great esteem. The new species was first observed by the author when three specimens were collected in a gill net during a fishery investigation of Conchas Lake, New Mexico, on 15 January 1960. The specimens were sent to Dr. H. H. Hobbs, Jr., after the author was unable to identify the species. Dr. Hobbs duly advised that they represented a new species and offered his advice and assistance in preparation of a description. This paper is a result of these events. Orconectes causeyi, sp. nov. Holotype male, form I.-Body stocky, subovate, depressed; abdomen slightly shorter than cephalothorax (56.4-57.9 mm). Height of cephalothorax (Figs. 1 and 2) slightly less than width in region of caudodorsal margin of cervical groove (25.4-25.7 mm); greatest width of cephalothorax (28.7 mm) about one-half the distance between caudodorsal margin of cervical groove and posterior dorsal margin of cephalothorax. Areola (i.e., thoracic, portion of cephalothorax on middorsial line) open. Cephalic portion less than twice as long as areola (37.3-20.6 mm) length of areola 35.6%v of length of cephalothorax. Rostrum long, excavate; sides converging; set off by weak lateral spines. Acumen with 'apex slightly curved dorsally, slightly longer than one third length of remainder of rostrum (4.7-11.0 mm). Margins of rostrum raised, keeled along dorsolateral edges; dorsal surface with longitudinal line of setiferous punctations along each margin medial to keels. Postorbital ridges well-developed, grooved laterad, terminating cephalad in weak anteriorly projecting spines. Branchiostegal spines
Published Version
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