By N. R. H. Burgess, G. O. Cowan (auth.)
A there it truly is! advisor to bugs of scientific and public wellbeing and fitness problem, in most cases within the tropics. each one bankruptcy covers identity, lifestyles cycle and conduct of the causative level and its medical/public healthiness significance.
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7 Life cycle of the sandfly. 33 SANDFLIES Fig. 8 Sandfly egg. Fig. 11 Fig. 9 Caudal bristles of mature sand fly larva First stage larva of the sandfly. Fig. 12 Sandfly pupa. 10 Later stage larva of the sandfly. 11). All larvae have minute segmental 'matchstick' hairs, which are clubbed, with a feathered shaft. The mature larva will cast its skin to form the pupa but the cast skin with four caudal bristles will remain fixed to the end of the pupa (Fig. 12). 34 Female sandflies will act as vectors of three diseases: leishmaniasis, sandfly fever and bartonellosis.
This may cause 'river blindness'. 10 Distribution of onchocerciasis. 6. Horseflies HORSEFLIES INTRODUCTION AND DESCRIPTION Horseflies make up the family Tabanidae in the suborder Brachycera. They are robust two-winged flies with antennae of three segments, the third of which has a series of annulations known as the style (Fig. 1). There are some 2000 species varying in length from 5 to 30 mm in several genera, the most important of which are Tabanus, Haematopota and Chrysops. Female Tabanids are blood-sucking (Fig.
The abdomen terminates in large paired claspers. The eyes in both male and female are dark and conspicu~ ous, and the body and wings are covered in long hairs, rendering the sandfly an inefficient flier. Thu~ it will not be found far from its breeding site, no~ will it fly in breezy conditions or much abov~ ground level. / Fig. 1 Sandfly. 3 Fig. 2 Sandfly in the resting position. Fig. 4 · Male sandfly. In this slide preparation most of the body hairs have been removed. 32 Female sandfly. LIFE CYCLE AND BREEDING SITES LIFE CYCLE AND BREEDING SITES There are some 600 species of sandfly that can be found in a wide range of habitats wherever the optimal breeding conditions of high temperature and humidity occur, often as a microclimate in leaf mould on the forest floor or in the cracks in bark and so on in tropical rain forests, where distribution of the sandfly may be particularly localized.