Montalenti, Giuseppe and Rocchi, Angela and Fontana, Pier Giorgio:
Il corredo cromosomico di Oecanthus pellucens (Orthoptera Grylloidea)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Serie 8 39 (1965), fasc. n.5, p. 237-239, (Italian)
pdf, djvu.
Sunto
The chromosome complement of male germ cells of some individuals of Oecanthus pellucens (Scop.) collected in Lazio and in Abruzzo has been examined. There are 2 n = 18 chromosomes with one heteromorphic pair. In spermatogonial mitotic metaphase there were observed 13 dot-shaped chromosomes and 5 large acrocentrics or subacrocentrics. Two of these are about $5 \mu$, two about $2,8 \mu$, and one about $4 \mu$ long, the latter probably being the X which pairs with a dot-shaped Y. In an early instar nymph a chromatic body was observed which is interpreted as a "mitotically stable" supernumerary chromosome. The chromosome numbers reported up to the present for species in the genus Oecanthus are 20 and 19.
Referenze Bibliografiche
[1] S. MAKINO, An unequal pair of idiochromosomes in the tree cricket Oecanthus longicauda, Mats., «J. Fac. Sci. Hokkaido Univ.» (VI), 2, 1-36 (1932).
[2] F. OHMACHI, A comparative study of chromosome complements in the Grylloidea in relation to taxonomy, «Bull. Mie Coll. Agric. For.», no. 5, 1-48 (1935).
[3] H. H. JOHNSON, Centrioles and other cytoplasmic components of the male germ cells of the Gryllidae, «Zeitschr. f. wiss. Zool.», 140, 115-66 (1931).
[4] Z. KITADA, Preliminary notes on the chromosomes of Oecanthus indicus, «Kromosomo», 5-6, 227-28 (1949).
[5] A. D. CONGER and L. M. FAIRCHILD, A quick-freeze method for making smear slides permanent, «Stain Tech.», 28, 281-283 (1953).
Con il contributo del Ministero per i Beni e le Attività Culturali