. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 35 (1984) Heft 1-3 Shrews in the Canary Islands 11 taña Clara. There is also a marked individual variation in skull size. Of two shrews found in the same habitat at La Oliva, Fuerteventura, one has a small skull (CIL mm) with a weak dentition, and the other one a large skull (CIL mm) with heavy teeth and a canine-like U1 (Figure 2). Both shrews are of similar age. Unfortunately the sexes have not been recorded by the collector, but judged from the skins th
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 35 (1984) Heft 1-3 Shrews in the Canary Islands 11 taña Clara. There is also a marked individual variation in skull size. Of two shrews found in the same habitat at La Oliva, Fuerteventura, one has a small skull (CIL mm) with a weak dentition, and the other one a large skull (CIL mm) with heavy teeth and a canine-like U1 (Figure 2). Both shrews are of similar age. Unfortunately the sexes have not been recorded by the collector, but judged from the skins the two shrews are female and male. It is most likely that the observed differences as well as the wide range of measurements (Table 3) reflect a sexual dimorphism. A sexual dimorphism is not present in the popula- tions of middle Europe but has been recently recorded from a small island (Meda Grossa) off the mediterranean coast of Spain (Sans-Coma, Gomez & Gosalbez 1976). Females are significantly smaller on this island. A sexual dimor- phism is also likely to occur in the Moroccan populations of Crocidura russula yebalensis. The range of measurements observed (Vesmanis & Vesmanis 1980; Hutterer, unpublished data) is very similar to that of the Canary shrews. We therefore conclude that the Canary shrews are likely to stem from northern Afri- can Fig. 2. Two skulls of Crocidura from La Oliva, Fuerteventura illustrate the enormous size variation of the Canary population which is probably due to sexual Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Zoologisches Forschungsinstitut und Museum Alexander Koenig. Bonn : Das Forschungsinstitut
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