The somatic chromosome complement of Bubulcus ibis consists of six pairs of macrochromosomes, twenty-three pairs of microchromosomes and a pair of sex chromosomes. The Z-chromosome is comparable in size to autosome pairs 3 and 4, from which it is difficult to distinguish, and the W-chromosome is indistinguishable from the larger microchromosomes. The chromosome complement of one individual was found to deviate from the normal because of structural heterozygosity involving a member of chromosome pair 1 and a microchromosome.
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Misra, M., Srivastava, M.D.L. Somatic chromosomes of Bubulcus ibis (L.) (Cattle-Egret): A case of reciprocal translocation. Genetica 46, 155–160 (1976). https://doi.org/10.1007/BF00121031
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DOI: https://doi.org/10.1007/BF00121031