The first karyotype study in palpigrades, a primitive order of arachnids (Arachnida: Palpigradi)
Language English Country Netherlands Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
- MeSH
- Biological Evolution MeSH
- Chromosomes genetics ultrastructure MeSH
- Species Specificity MeSH
- Karyotyping MeSH
- Meiosis MeSH
- Mitosis MeSH
- Arachnida classification genetics ultrastructure MeSH
- Sex Chromosomes genetics ultrastructure MeSH
- Animals MeSH
- Check Tag
- Male MeSH
- Female MeSH
- Animals MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
Chromosomes of palpigrades (Arachnida: Palpigradi), a rare arachnid order with numerous primitive characters, were studied for the first time. We analysed two species of the genus Eukoenenia, namely E. spelaea and E. mirabilis. Their karyotypes are uniform, consisting of a low number of tiny chromosomes that decrease gradually in size. Study of the palpigrade karyotype did not reveal morphologically differentiated sex chromosomes. Analysis of E. spelaea showed that constitutive heterochromatin is scarce, GC-rich, and restricted mostly to presumed centromeric regions. Meiosis is remarkable for the presence of a short diffuse stage and prominent nucleolar activity. During prophase I, nuclei contain a large nucleolus. Prominent knob at the end of one bivalent formed by constitutive heterochromatin is associated to the nucleolus by an adjacent NOR. Presence of a nucleolus-like body at male prophase II suggests activity of NOR also during beginning of the second meiotic division. The data suggest acrocentric morphology of palpigrade chromosomes. Palpigrades do not display holocentric chromosomes which appear to be apomorphic features of a number of arachnid groups. These are: acariform mites, buthid scorpions, and spiders of the superfamily Dysderoidea. Therefore, cytogenetic data do not support a close relationship of palpigrades and acariform mites as suggested previously.
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Hereditas. 2004;140(1):49-60 PubMed
Chromosome Res. 1997 Feb;5(1):47-56 PubMed
Plant Cell. 2005 Jul;17(7):1886-93 PubMed
Genome. 1989 Jun;32(3):380-2 PubMed
J Hered. 2003 Jul-Aug;94(4):285-90 PubMed
Experientia. 1980 Aug 15;36(8):1014-5 PubMed
Annu Rev Entomol. 1977;22:407-29 PubMed
Exp Cell Res. 1972 Nov;75(1):304-6 PubMed
Cytogenet Cell Genet. 1992;60(3-4):229-35 PubMed
Chromosome Res. 2006;14(8):859-80 PubMed
Nature. 1967 May 20;214(5090):809 PubMed
Chromosome Res. 2005;13(2):145-56 PubMed
Chromosome Res. 2004;12(6):641-53 PubMed
Hereditas. 2004;140(2):105-11 PubMed
Genetica. 2006 Jan;126(1-2):141-51 PubMed
Exp Cell Res. 1976 Sep;101(2):235-43 PubMed
Tsitologiia. 1967 Mar;9(3):257-64 PubMed
Insect Mol Biol. 2005 Apr;14(2):217-22 PubMed
Cladistics. 2002 Feb;18(1):5-70 PubMed
