Holomorphology and systematics of the stonefly genus Isogenoides (Plecoptera: Perlodidae)

Prior to this study, the stonefly genus Isogenoides Klapálek contained nine species distributed throughout North America, north of Mexico. Despite this small number of species, Isogenoides has remained a problematic genus because of the lack of detailed comparative studies of genitalic, egg and nymp...

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Bibliographic Details
Published in:Transactions of the American Entomological Society (1890) 2005-09, Vol.131 (3-4), p.269-345
Main Authors: Sandberg, J.B, Stewart, K.W
Format: Article
Language:English
Subjects:
Abdomen
geographical distribution
insect morphology
insect rearing
insect taxonomy
Integument
Isogenoides
Isogenoides krumholzi
new synonymy
Nymphs
Ocelli
Ova
Perlodidae
Pigments
Plecoptera
Short pants
Sternum
Stripes
taxonomic keys
taxonomic revisions
type collections
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Summary:Prior to this study, the stonefly genus Isogenoides Klapálek contained nine species distributed throughout North America, north of Mexico. Despite this small number of species, Isogenoides has remained a problematic genus because of the lack of detailed comparative studies of genitalic, egg and nymph characters. This revision of Isogenoides has involved all known university, museum and individual holdings, and new collections by colleagues and us over a four-year period from type localities and other sites to rear males and females of all species. Rearing provided nymph correlation for comparative descriptions and fresh males for aedeagal extrusion. The in situ genitalia of males, and details of the aedeagus, epiproct, lateral stylets, hemitergal processes and other structures were computer-illustrated and photographed using scanning electron microscopy. Holomorphological examination of all life stages has resulted in new comparative descriptions, keys, and synonymy of Isogenoides krumholzi (Ricker 1944) with I. doratus (Frison 1942). Recently collected nymphs can be identified primarily by subtle differences in pigment patterns and with combinations of other finite characters.
ISSN:0002-8320
2162-3139