<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Acomys (Acomys) cahirinus</title> <meta content="text/html; charset=UTF-8" http-equiv="content-type"/> </head> <body> <p> <i>Acomys (Acomys) cahirinus</i> (E. Geoffroy 1803)</p> <p> <i>[Acomys (Acomys)] cahirinus</i> (E. Geoffroy 1803), Cat. Mamm. Mus. Natl. Hist. Nat., Paris: 195.</p> <p>Type Locality: Egypt, Cairo.</p> <p>Vernacular Names: Northeast African Spiny Mouse.</p> <p> Synonyms: <i>Acomys (Acomys) albigena</i> (Heuglin 1877); <i>Acomys (Acomys) helmyi</i> Osborn 1980; <i>Acomys (Acomys) hunteri</i> De Winton 1901; <i>Acomys (Acomys) megalodus</i> Setzer 1959; <i>Acomys (Acomys) nubicus</i> (Heuglin 1877); <i>Acomys (Acomys) sabryi</i> Kershaw 1922; <i>Acomys (Acomys) viator</i> Thomas 1902.</p> <p>Distribution: NE Africa: Libya, Egypt (Osborn and Helmy, 1980), Sinai Peninsula (Saleh and Basuony, 1998), N Sudan, Ethiopia (identified by chromosomal traits; Sokolov et al., 1992, 1993), and Djibouti (Pearch et al., 2001); see Bates (1994); W and S distributional limits unresolved.</p> <p>Conservation: IUCN – Lower Risk (lc).</p> <p> Discussion: Subgenus <i>Acomys</i>. Musser and Carleton (1993) presented a broad definition of <i>A. cahirinus</i> that included some of the species listed here (<i>airensis</i>, <i>chudeaui</i>, <i>dimidiatus</i> and its synonyms, <i>johannis</i> and <i>seurati</i>) and had a geographic range extending from NW Africa to S Pakistan (as mapped by Bates, 1994, who followed Musser and Carleton, 1993). A growing body of published research, mostly by French scientists, has rendered Musser and Carleton’s view simplistic and an underestimate of the actual number of species. As currently understood, the geographic distribution of <i>A. cahirinus</i> centers in NE Africa, and the species is distinguished from <i>A. airensis</i>, <i>A. chudeaui</i>, <i>A. dimidiatus</i>, <i>A. johannis</i>, and <i>A. seurati</i> by dental characters (Denys et al., 1994), chromosomal traits (Volobouev et al., 1991, 1996, 2002 <i>b</i>; 2n = 36 for <i>A. cahirinus</i>, 2n from 38 to 68 for the other species), and mtDNA cytochrome <i>b</i> sequences (Barome et al., 2000, 2001 <i>a</i>, <i>b</i>); see accounts of those species.</p> <p> Morphological and geographic definition of <i>A. cahirinus</i> remains incomplete; some of the taxa listed here as synonyms may belong to other species. El Ashmawy (1990), for example, documented different G- and C-banding patterns in <i>cahirinus</i> and <i>hunteri</i> from Egypt. Osborn and Helmy (1980), however, noted the ample evidence of intergradation between <i>hunteri</i> (described from NE Sudan) and <i>cahirinus</i> but no indication that <i>hunteri</i> intergrades with the more southern <i>cineraceus</i>. We provisionally include <i>viator</i> (type locality NC Libya) in the synonymy of <i>A. cahirinus</i>, but Osborn and Helmy (1980) recorded smaller measurements for that form in Egypt (occurs only in extreme SW corner of the country) compared with all the other samples of <i>A. cahirinus</i>, and Denys et al. (1994) described the molar morphology of <i>viator</i> as distinct from that of <i>A. cahirinus</i>. Ranck (1968) provided detailed descriptions of pelage and habitat for samples from Libya that he assigned to <i>viator</i>. Whether the latter represents the easternmost segment of <i>A. cahirinus</i>, is a separate species, or a population of some other <i>Acomys</i> (the Algerian <i>seurati</i>, for example) will have to be determined by cytogenetic, molecular, and additional morphological inquiries.</p> <p> Setzer (1959:95) claimed melanistic <i>A. cahirinus</i> to be "almost exclusively commensal" or, if not actually caught in houses, collected in cultivated fields adjacent to villages. Osborn and Helmy (1980:298) noted that melanism is common in the Egyptian population "because it is the commonest mouse in buildings and houses. Some have been taken in gardens, date groves, and rocky hills and cliffs bordering the Nile Delta and Valley." The rat is also numerous in tombs and temples where the melanism becomes diluted.</p> </body> </html>