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Salticidae: Diagnostic Drawings Library

by Jerzy Proszynski 1997

Genus Ptocasius Simon, 1885

Separation of species of Ptocasius and Yaginumaella, or synonymization of both genera, awaits results of additional research

Diagnoses of genera of South East Asia: Light or colourful, sometimes iridescent salticids. Shrubs, plants, especially broad leaved. General remarks: In the field, plants with large green leaves, such as ginger, are often favoured by salticids, particularly colourful species. Some are clothed with dense, coloured, iridescent hairs which makes them particularly attractive and conspicuous. They are often to be seen wandering about or sunning themselves on top of the leaves and sometimes to be found resting or in a cell under a leaf. Salticids often build a retreat between and attached to two closely overlapping leaves. With care and a suitably placed sweep net, one can often collect the owner. Genus: Ptocasius. This is a somewhat ordinary, dull coloured genus of salticids which are often found on shrubs. At present Ptocasius is a small genus with most of its species occurring in our area. However, it is said to be close to and possibly synonymous with the much larger genus Yaginumaella, The cephalothorax is high with the top rounded and sloping in both directions from the rear eyes. The carapace is longer than wide with the sides curved, briefly flared near the front eyes and has a somewhat truncated posterior margin. The abdomen is oval, truncated anteriorly and slightly pointed near the spinnerets. The legs are not particularly long or slender and carry some spines. For P. strupifer, the carapace is dark brown in colour, with white setae near the fovea. The underlying colour of the abdomen is grey-brown. There are wide, curved, light transverse bands across the shoulders and the middle, plus a light circular area near the spinnerets. The legs are dark greyish-brown with the extremes of the segments lighter.
Distribution: Ptocasius is known from Sri Lanka, Singapore, Sumatra, Myanmar, Vietnam, Hong Kong, China, Korea and Japan. Yaginumaella occurs in the subtropical Himalayas, a range adjacent to that of Ptocasius. Murphy & Murphy 2000: 353. By courtesy of the Authors' and the Malaysian Nature Society.

Copyright © for the page by J. Proszynski, 1999. ====================================================================

Ptocasius plumbeiventris (Keyserling, 1881) Australia Zabka, in litt.