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Overwintering Physiology of the Scorpion Diplocentrus spitzeri

Long-lived arthropods in arid areas must contend with periodic exposure to drought and heat, and sometimes to flooding and cold. Because all of these can be fatal, avoiding their lethal effects necessitates having evolved suitable adaptations. This paper deals with the possible development of cold hardiness in a species of scorpion. Diplocentrus spitzeri is found in certain low mountain ranges in southwestern New Mexico, southern Arizona, and probably northern Sonora, Mexico (Stahnke 1970; Crawford and Wooten 1973). Although the regional climate is semiarid, the usual microhabitat of D. spitzeri is essentially subterranean, and therefore essentially mesic. In the Peloncillo Mountains of New Mexico the burrows of this scorpion appear relatively shallow in the rocky, volcanic soil. Burrow entrances open beneath rocks, which, when overturned at any time of year, may reveal a scorpion in or near such an opening. Relative to other scorpions, this species does not possess exceptional ability to avoid desiccation. However, Crawford and Wooten (1973) concluded that survival should not be affected