Embryonic Development, Early Instar Morphology, and Behavior of Tortopus Incertus (Ephemeroptera: Polymitarcidae)
Abstract
The chorion of the egg of Tortopus incertus (Traver) was studied with the scanning electron microscope. Embryonic development at various temperatures was observed externally. Anatrepsis was blocked at 13.65@* @+ 1@* C. Eggs kept at 19.45@* @+ 1@* and 23.0@* @+ 1@* C hatched after 33 and 41 days respectively. Mandibular tusks were present in the fully developed embryos. The morphology of the first and second nymphal instars was given; the cleaning and burrowing behavior of the first nymphal instars were described. First nymphal instars have a decided preference for burrowing in mud substrate over sand.Downloads
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