A Study of the Hatching Process in Aquatic Invertebrates. XVIII. Eclosion in Helicopsyche borealis (Hagen) (Trichoptera, Helicopsychidae). XIX. Hatching in Psephenus herricki (De Kay) (Coleoptera, Psephenidae).

1 October 1965

journal article
research article
Published by JSTOR in The American Midland Naturalist

Vol. 74 (2) , 443-+
https://doi.org/10.2307/2423273

Abstract

Hatching was observed in eggs of the trichopteran, Helicopsyche borealis, and the riffle beetle, Psephenus herricki. In both species the prolarvae swelled as a result of the swallowing of water as hatching time approached. Bursting of the tightly stretched chorion then took place during active movements of the prolarva. In Helicopsyche the break in the chorion always occurred dorsally, over the anterior part of the pronotum, whereas in Psephenus the break occurred over the anterior edge of the carapace.

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