| Comment | In south Otago/Southland Oligosoma maccanni and O. polychroma are clearly distinguishable from each other by three mutually exclusive morphological characters, namely, presence or absence of dorsal stripe to end of tail, number of subdigital lamellae scales on hind foot 4th toe, and number of rows of mid-body scales. However, species-distinguishing characters are less evident in the north of their range. In the vicinity of Alexandra, the presence of chin speckling in O. maccanni and its absence in O. polychroma clearly define the species. In addition, extremes of some character trait ranges remain exclusive to each species. These traits may be considered with chin speckling to strengthen confidence of species identification. No mutually exclusive ranges in morphological traits exist between O. maccanni and O. polychroma from the Canterbury/Marlborough region (from REARDON & TOCHER 2003). |
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