The small nymphs of Diura nanseni (Kempny) (Plecoptera)

The small nymphs of Diura nanseni (Kempny) (Plecoptera) 297 The small nymphs of Diura nanseni (Kempny) (Plecoptera)* SVEIN JAKOB SALTVEIT A description of the development of the maxilla and the changes in colour pattern of the immature nymphs of the stonefly Diura nanseni is given. The maxillae of these nymphs differed from the description given for larger nymphs used in keys. The colour pattern of these nymphs was also different. S. J. Saltveit, Zool. Mus., Univ. of Osto, Sars gt. 1, Oslo 5, Norway. According to Brinck (1949) the nymphs of Diura are separated from Isogenus and Isoperla by the maxilla: "Lacinia emarginate just below the subapical tooth, with a fringe of bristles on the inner margin". . D. nanseni has a two year life history, with a long egg incubation period (Lillehammer 1976). In a watercourse northwest of Oslo, small and full-grown nymphs of D. nanseni were found together in May (Saltveit 1977). However, the small nymphs do not follow Brinck's (1949) description. In nymphal taxonomy little atten- tion has been paid to earlier instars. This is the reason for the reservations Brinck ( 1949) makes in his key regarding its application for smaller nymphs. The inadequacy of keys for smaller nymphs has also been http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Insect Systematics & Evolution Brill

The small nymphs of Diura nanseni (Kempny) (Plecoptera)

Insect Systematics & Evolution, Volume 9 (4): 297 – Jan 1, 1978

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Publisher
Brill
Copyright
© 1978 Koninklijke Brill NV, Leiden, The Netherlands
ISSN
1399-560X
eISSN
1876-312X
D.O.I.
10.1163/187631278X00331
Publisher site
See Article on Publisher Site

Abstract

297 The small nymphs of Diura nanseni (Kempny) (Plecoptera)* SVEIN JAKOB SALTVEIT A description of the development of the maxilla and the changes in colour pattern of the immature nymphs of the stonefly Diura nanseni is given. The maxillae of these nymphs differed from the description given for larger nymphs used in keys. The colour pattern of these nymphs was also different. S. J. Saltveit, Zool. Mus., Univ. of Osto, Sars gt. 1, Oslo 5, Norway. According to Brinck (1949) the nymphs of Diura are separated from Isogenus and Isoperla by the maxilla: "Lacinia emarginate just below the subapical tooth, with a fringe of bristles on the inner margin". . D. nanseni has a two year life history, with a long egg incubation period (Lillehammer 1976). In a watercourse northwest of Oslo, small and full-grown nymphs of D. nanseni were found together in May (Saltveit 1977). However, the small nymphs do not follow Brinck's (1949) description. In nymphal taxonomy little atten- tion has been paid to earlier instars. This is the reason for the reservations Brinck ( 1949) makes in his key regarding its application for smaller nymphs. The inadequacy of keys for smaller nymphs has also been

Journal

Insect Systematics & EvolutionBrill

Published: Jan 1, 1978

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