Abstract
SUMMARYDetails of mitosis and meiosis are presented for four species of the genus Anopheles, subgenus Cellia; tessellatus, maculatus, annularis and subpictus. In each 2n = 6, one pair of dimorphic heterosomes and two pairs of autosomes, the latter differing slightly in arm length ratios. Mitotic stages are remarkably uniform. All species studied have small spermatogonia, filled with chromatin granules, and an eccentrically placed nucleolus. Long threads are evident during prophase; metaphase and anaphase are synchronous and uneventful. During meiosis, no leptotene or zygotene stages have been observed. Pachytene chromosomes are long, thick bivalents studded with dark granules. Sex bivalents are positively heteropycnotic during pachytene only. The nucleolus disappears during late pachytene or diplotene, at which time 1, to 6 (usually maximum of 4) chiasmata are evident; these terminalize during diakinesis. Metaphase and anaphase one appear normal. During meiosis two the two types of secondary gametocytes, ...
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