. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. KEAST : BIRD SPECIATION IN AUSTRALIA 367 Dasyornis: The two species, D. broadbenti and D. brachyp- terus, whose habitat is dense coastal undergrowth, have a dis- continuous and relict distribution, each being isolated into two distinctive stocks, a southeastern and a southwestern one (see figure in Keast, 1957b). The southwestern forms are virtually extinct todav. ROCKY RIVER GORGES PORCUPINE GRASS ON SAND PLAINS PORCUPINE GRASS IN STONY GULLIES PORCUPINE GRASS ON STONY HILLS. AMYTORNIS STRIATUS SUPERSR HIGH RANK GRAS
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. KEAST : BIRD SPECIATION IN AUSTRALIA 367 Dasyornis: The two species, D. broadbenti and D. brachyp- terus, whose habitat is dense coastal undergrowth, have a dis- continuous and relict distribution, each being isolated into two distinctive stocks, a southeastern and a southwestern one (see figure in Keast, 1957b). The southwestern forms are virtually extinct todav. ROCKY RIVER GORGES PORCUPINE GRASS ON SAND PLAINS PORCUPINE GRASS IN STONY GULLIES PORCUPINE GRASS ON STONY HILLS. AMYTORNIS STRIATUS SUPERSR HIGH RANK GRASS IN TUFTS CLUMPS OF PORCUPINE GRASS IN MALLEE Fig. 18a. The range of the various forms in the A. striatum superspecies. The parental A. striatus (1, a-d) extends widely through the arid and semi-arid interior, whilst the distinctive derivatives A. dorotheae, A. icood- u-ardi, and A. housei (2, 3, 4) are isolated in the rocky gorges of the McArthur, Alligator, and Charnley Rivers, respectively. The habitats oc- cupied in different areas are shown on the outside of the map, vegetation formations that constitute distributional barriers on the inside. The three northern species could only have reached their present position at a time when desert spinifex grassland was continuous through to the northern seaboard. Stipiturus: A single superspecies is involved here, there being three major, isolated, stocks falling into two species. Their dis- tribution is shown in Figure 19. Stipiturus is an interesting genus in two ways: (a) because of the large number (5) of morphologically differentiated iso- lates in the species S. malachurus. These, occupying shrinking areas of specialized coastal habitat and cut off from the main stock in southeastern Australia, occur as follows: — Tasmania. 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 th
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Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
