. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. COLOUR KEY Red Yellow Green or ! Blue • Black Black Wh,te White. Fig. 12. Isolation and speciation in the Platycercus eximius group of savannah woodland — sclerophyll forest rosella parrots. Geographically- representative forms, so distinctive that they are called species, occur in the northwest, northeast, southeast, and southwest of the continent, respec- tively. Secondary range contact and some hybridization ("H") occur be- tween P. adscitus and P. eximius today. The status of these forms requires further
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. COLOUR KEY Red Yellow Green or ! Blue • Black Black Wh,te White. Fig. 12. Isolation and speciation in the Platycercus eximius group of savannah woodland — sclerophyll forest rosella parrots. Geographically- representative forms, so distinctive that they are called species, occur in the northwest, northeast, southeast, and southwest of the continent, respec- tively. Secondary range contact and some hybridization ("H") occur be- tween P. adscitus and P. eximius today. The status of these forms requires further investigation. P. eximius has a minor insular isolate on Tasmania. The most interesting feature of Barnardius is that a series of distinctive isolates have developed in the various river sys- tems in different parts of the continent. There are such forms centred on the group of rivers entering the head of the Gulf of Carpentaria in the north (b. macgillivrayi), the Hamersley (mid-western) watershed (z. occidcntalis), the Murchison River (z. connectens), the southwest (z. semitorquatus), the streams arising in the Macdonells in central Australia (z. myrtac), and the Murray-Darling system (b. barnardi). The distribution. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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