Abstract
The chromosome complement of Gueriniella serratulae (F.) Fernald, Tribe Iceryini, Subfamily Monophlebinae of the primitive coccid Family Margarodidae, is 2 n ♀=6; males are unknown. Reproduction is by thelytokous parthenogenesis. Meiosis is normal; polar bodies do not contribute to the formation of a zygote-substitute nucleus; and development is initiated by a haploid cleavage of the female pronucleus. Diploidy is restored by the fusion of the 2 nuclei resulting from this division. With the exception of Gueriniella, all cytologically known Iceryini are haplo-diploids, with a chromosome complement of n=2. The hypothesis is proposed that Gueriniella is a persistent primitive stemming from the ancestral iceryine stock prior to the loss of the sex chromosomes and the evolution of haplo-diploidy within the tribe. A review of the available evidence from cytology, taxonomy, endosymbiosis, behavior and distribution shows good agreement with this interpretation.
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Dedicated to Professor Jakob Seiler on the occasion of his 80th birthday.
Supported in part by National Science Foundation Grant GB-1922 to S. Hughes-Schrader; we also gratefully acknowledge the support of Professor G. Russo, Director of the Entomological Laboratory, Portici.
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Hughes-Schrader, S., Tremblay, E. Gueriniella and the cytotaxonomy of iceryine coccids (Coccoidea:Margarodidae). Chromosoma 19, 1–13 (1966). https://doi.org/10.1007/BF00332790
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DOI: https://doi.org/10.1007/BF00332790