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Flagellar Axonemes with 10 Microtubular Doublets in Spermatozoa from Gall‐midges (Diptera, Cecidomyiidae)
Author(s) -
Dallai Romano,
Afzelius Björn A.,
Mamaev Boris
Publication year - 1996
Publication title -
acta zoologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.414
H-Index - 37
eISSN - 1463-6395
pISSN - 0001-7272
DOI - 10.1111/j.1463-6395.1996.tb01259.x
Subject(s) - axoneme , biology , cecidomyiidae , tribe , gall , subfamily , anatomy , flagellum , botany , paleontology , genetics , sociology , bacteria , anthropology , gene
The spermatozoa of some gall‐midges (Cecidomyiidae, Lestremiinae), belonging to the tribe Micromyini, were seen to have an axoneme that consists of 10, instead of nine, microtubular doublets surrounding a central cylinder. In some related species within the same tribe the axoneme was found to contain a similar cylinder but to have nine doublets, as in typical flagella, or to have nine doublets and no central structure. These three types of axonemes can be given the shorthand designations “10+cyl”,“9+cyl”, and “9+0”. The tribe Lestremiini is characterized by a giant axoneme having 150 doublets in two rows reversely oriented. Other characteristics of examined spermatozoa are the electron density of the B‐tubules of the axoneme, a feature shared by all members of the subfamily Lestremiinae, and the presence of a prominent cytoplasmic droplet containing numerous, regularly spaced microtubules, which is shared by all Micromyidi. These axonemal models are discussed from a phylogenetic point of view.