. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 228 E. Van der Straeten Comparing the different holotypes of Mastomys, a great variation in curvature of the front edge of the zygomatic plate is observed. In M. pemanus it is straight and almost vertical. Each of the upper molars is 3-rooted. M1: in the first lamina the tl is shifted to the rear, also a typical Mastomys character; the front edge of t2 carries a supplementary cusp, mostly even a ridge; t3 is somewhat smaller than tl and t9 is clearly present; tl is
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 228 E. Van der Straeten Comparing the different holotypes of Mastomys, a great variation in curvature of the front edge of the zygomatic plate is observed. In M. pemanus it is straight and almost vertical. Each of the upper molars is 3-rooted. M1: in the first lamina the tl is shifted to the rear, also a typical Mastomys character; the front edge of t2 carries a supplementary cusp, mostly even a ridge; t3 is somewhat smaller than tl and t9 is clearly present; tl is lacking and replaced by a faint ridge. In M2 the t9 is prominent and the t3 is small to very small (absent in one specimen); also here the tl is a faint ridge. Only in two specimens there is a very small t3 in M3. This M3 has the third lamina with 2 cusps. Distribution All known specimens were collected in the north of Tanzania and the south of Kenya (see fig. 2). One exception is the specimen from Dakawa, a locality about 550 km more to the south (not on the map). Misonne & Verschuren (1964) mentioned the presence of M. pemanus in owl pellets from Rwanda (Pare de l'Akagera) and a skull from Campi Ya Mawe in Tanzania. This material could not be recovered in the KBIN (per. com. G. Lenglet).. Fig. 2: Distribution map of Mastomys pemanus (see text).. 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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