Seychelles Fauna Monographs
The Seychelles islands comprise 115 islands in the western Indian Ocean. These form two main groups; the northern granitic islands and the southern, coralline islands (Fig. 1-2). The southern islands are less than 10m above sea level, representing raised coral atolls or sand cays (Matthews & Davies 1966; Stoddart et al. 1971). This results in limited habitat variation and correspondingly low species diversity. The granitic islands (Fig. 2) are the remnants of the Seychelles microcontinent which was isolated following the break-up of Gondwanaland 65-100 million years ago. These are high islands reaching 905 metres above sea level. This results in great habitat diversity and high rainfall, contributing to the growth of diverse rain forest habitats.
The following account concerns all species of Orthopteroidea recorded in the islands. The Orthopteroid insect orders comprise the crickets, katydids and grasshoppers (Orthoptera), stick and leaf insects (Phasmatodea), web-spinner (Embiidina) and the Dictyoptera (termites, cockroaches, mantises and earwigs). This is an early group of insects, dating back some 300 million years.
Justin Gerlach & Fabian Haas2008, 88 p., 8 textfigs, 1 table, 4 colour plates, paperbound
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