The spermatogenesis of the Lycosid spider, schizocosa crassipes (Walckenaer)

Hard, Walter L.

doi:10.1002/jmor.1050650106

Cited by 11 publications

(6 citation statements)

References 35 publications

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“…The five species from the USA already studied (S. communis, S. crassipes, S. ocreata, S. rovneri, S. stridulans) also had n = 10+X 1 X 2 , whereas an unidentified species from India (Schizocosa sp. 1 in Table 1) had n = 13+X 1 X 2 (Painter, 1914;Hard, 1939;Mittal, 1960Mittal, , 1963Stratton, 1997). These results allowed us to conclude that the modal chromosome number for the genus is 2n = 22/24 (male/female) and that the sex chromosome determination system is of the X 1 X 2 / X 1 X 1 X 2 X 2 type.…”

Section: Discussionmentioning

confidence: 99%

Cytogenetic studies of three Lycosidae species from Argentina (Arachnida, Araneae)

et al. 2008

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Cytogenetic studies of the family Lycosidae (Arachnida: Araneae) are scarce. Less than 4% of the described species have been analyzed and the male haploid chromosome numbers ranged from 8+X 1 X 2 to 13+X 1 X 2 . Species formerly classified as Lycosa were the most studied ones. Our aim in this work was to perform a comparative analysis of the meiosis in "Lycosa" erythrognatha Lucas, "Lycosa" pampeana Holmberg and Schizocosa malitiosa (Tullgren). We also compared male and female karyotypes and characterized the heterochromatin of "L." erythrognatha. The males of the three species had 2n = 22, n = 10+X 1 X 2 , all the chromosomes were telocentric and there was generally a single chiasma per bivalent. In "Lycosa" pampeana, which is described cytogenetically for the first time herein, the bivalents and sex chromosomes showed a clustered arrangement at prometaphase I. The comparison of the male/female karyotypes (2n = 22/24) of "Lycosa" erythrognatha revealed that the sex chromosomes were the largest of the complement and that the autosomes decreased gradually in size. The analysis of the amount, composition and distribution of heterochromatin with C-banding and staining with DAPI-and CMA 3 -showed that "Lycosa" erythrognatha had little GC-rich heterochromatin in the pericentromeric region of all chromosomes. In addition, the actual occurrence of the genus Lycosa in the Southern Hemisphere is discussed.

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Section: Discussionmentioning

confidence: 99%

Cytogenetic studies of three Lycosidae species from Argentina (Arachnida, Araneae)

et al. 2008

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“…Early studies on the chromosomes of Lycosidae spiders (Montgomery, 1905;Painter, 1914;Hard, 1939;Hackman, 1948;Suzuki, 1954;Mittal, 1963) demonstrated the presence of an X~X20 sexdctermining mechanism in the male of this family. More recently, Diaz & Saez ( 1965, 1966 and BrumZorrilla & Cazenave (1974), found the XIX20 (male) system as the most frequent in Uruguayan Lycosidae species; Lycosa nordenskjOldii, which has a simple XO system, is an exception within this group (Diaz & Saez, 1965).…”

Section: Introductionmentioning

confidence: 99%

Karyological studies on Uruguayan spiders II. Sex chromosomes in spiders of the genus Lycosa (Araneae-Lycosidae)

Postiglioni

Brum‐Zorrilla

1981

Genetica

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Different sex-determining mechanisms (~: XO; XI X20; X~X2X30) were studied in species of the Lycosidae family, named for the purpose of description as follows: Lycosa sp.~ (malitiosa group), Lycosa thorelli Keyserling, Lycosa sp.2 (thorelli group) and Lycosa sp. 3. While L. sp. I (malitiosa group) shows a single metacentric sex-chromosome, L. thorelli and L. sp. 3 present a multiple system (X~X20). A new system (X~X2X30) was found in L. sp. 2 (thorelli group) (coexisting with L. thorelliin the same habitat). Its particular behaviour during meiotic prophase is discussed. The sex-chromosome lengths were compared in the statistical analysis. An anova test with two unequal classes (Group A = sex-chromosomes from X~X20 species; Group B = sex-chromosomes from X~X2X30 species) and the additional component variance were used for quantitative comparisons. A non-disjunction phenomenon in the second male meiosis is postulated as the origin of specimens with an X~X2X30 sex-determining mechanism.

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“…Spermatogenesis in spiders has been studied and discussed by several investigators (Wallace 1905and 1909, Painter 1914, Chickering and Hard 1935, Hard 1939, Sharma 1950and Bole-Gowda 1950. These authors have shown that spermatogenesis in spiders is not unlike that occurring in other arthropods.…”

Section: Resultsmentioning

confidence: 99%