Banded chromosome studies and B chromosomes in wild-caught raccoon dogs, Nyctereutes procyonoides viverrinus

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Abstract
Cytogenetic studies were made on Japanese raccoon dog (Nyctereutes procyonoides viverrinus) that were caught in the wild in southern Kyushu[Japan] and northern Honshu[Japan]. G-banding, C-banding, acridine orange (AO) staining following BudR incorporation, and silver staining for nucleolar organizer regions (NORs) were performed on chromosomes from fibroblast cultures. Modal numbers varied from 40 to 42. The karyotype comprised 26 mediocentric and 10 acrocentric autosomes, a submetacentric X, and a minute submetacentric Y. Unpaired B chromosomes which differed in number between animals accounted for the variable modal numbers. B chromosomes stained indistinctly with G-banding but showed a variety of positive patterns with C-banding and differentiated staining with AO. NORs were observed on the telomeric ends of the long arms of chromosomes 11, 12, and 18. No cytogenetic differences were seen between the northern and southern animals.