. Breviora. CUBAN GENUS VIANA whitish mottling; and in size from the large forms of Sierra Rangel, ( mm in width) to the small forms ( mm in width) which inhabit small mogotes such as those at Kilometer 14, Vinales. In most cases, specimens of Viana collected on small mogotes are dwarf forms about one-half the size of typical specimens. It is apparent that the size of individual specimens is a function of the area of the habitat and may very well be of selective value for survival, based upon the supply of food. In addition to other variations, the margin of the peristome may be simple
. Breviora. CUBAN GENUS VIANA whitish mottling; and in size from the large forms of Sierra Rangel, ( mm in width) to the small forms ( mm in width) which inhabit small mogotes such as those at Kilometer 14, Vinales. In most cases, specimens of Viana collected on small mogotes are dwarf forms about one-half the size of typical specimens. It is apparent that the size of individual specimens is a function of the area of the habitat and may very well be of selective value for survival, based upon the supply of food. In addition to other variations, the margin of the peristome may be simple and unre- flected as in V. regina regina and V. regina laevigata, or more or less strongly reflected as in V. regina subunguiculata. From the scant field notes we assembled we find that vianas are largely satisfied with the presence of limestone, shade, and mois- ture. We have never collected a live specimen other than on lime- stone rock. Nothing has been published about their food, but they probably eat the lichens found on the rocks on which they live. They have an enemy in the larval form of the large Cuban fire- fly, Alecton sp.; pictures have been taken of such a larva devouring a Viana through the aperture (PI. 1). Probably the firefly larva. PLATE 1 Viana regina (Morelet) Viana regina Morelet being attacked by a lampyrid beetle larva (Alecton sp.). Photo by F. de Zayas (about 6 X).. 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. , Museum of Comparative Zoology, Harvard University
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