. The Australian zoologist. Zoology; Zoology; Zoology. P. S. LAKE and K. J. NEWCOMBE. Fig. 6. Diagrammatic transverse section of a typical burrow system occupied by one adult Parastacoides tasmanicus. two or three holes may open to the surface, but these usually meet below the surface. From the major burrow entrance, a branch may sometimes be found, leading to a small chamber beneath a large clump of vegetation. On drier soils, the burrow entrance is frequently found in clumps of vegetation. The main burrow from the entrance invariably in going deeper takes a number of twists and turns and fin
. The Australian zoologist. Zoology; Zoology; Zoology. P. S. LAKE and K. J. NEWCOMBE. Fig. 6. Diagrammatic transverse section of a typical burrow system occupied by one adult Parastacoides tasmanicus. two or three holes may open to the surface, but these usually meet below the surface. From the major burrow entrance, a branch may sometimes be found, leading to a small chamber beneath a large clump of vegetation. On drier soils, the burrow entrance is frequently found in clumps of vegetation. The main burrow from the entrance invariably in going deeper takes a number of twists and turns and finally terminates in all systems, in a bottom chamber. Where there is a quartzite gravel layer, the level of the bottom chamber is fixed, for the crayfish do not penetrate deeper than 1 to 2 cms into the quartzite layer. In drier areas, the burrows are deeper, because the water table is deeper. The burrows were from .4 to 1 metre deep in the study area. In the tunnel system of the study area, the burrows usually open at the base of vegetation clumps and are not very deep ( to 15 cms). Recent digging activity in burrows may be indicated by shall chimneys, but these are never as well developed or as large as those created by species of Engaeus. In the study area in the August-September excavation 185 burrows were dug up. The percentage of burrow occupancy was Of the burrows dug up, only four burrows were found which were interconnected. In each of these cases the interconnecting passages were full of mud and detritus and may be regarded as being disused. The relatively large diameter of the burrows suggest that adults 204 Aust. Zool. 18(3), 1975. 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 Royal Zoological Society of New South Wales; Royal Zoological Society of New South Wales. Proceedings. [Sydney
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