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
Insect Systematics & Evolution – Brill
Published: Jan 1, 1978
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera