Chromosome Number of Stylochus ellipticus (Girard)

join(, Leonard M. Bahr; Hillman, Robert E.

doi:10.2307/3224651

Cited by 4 publications

(2 citation statements)

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“…Whereas chromosome counts in the Catenulida revealed between 16 and 40 diploid chromosomes (Ruebush 1938; reviewed in Benazzi and Benazzi‐Lentati 1976), the Acoela come up with six to 34 diploid chromosomes (Gardiner 1898; Ruebush 1938; Marcus 1952, 1954; Costello 1970; reviewed in Benazzi and Benazzi‐Lentati 1976; see also Apelt 1969; Crezee 1975; Birstein 1990). The variation is similar in chromosome numbers for haploid chromosomes in the Polycladida ranging from 2 ( Notoplana necta , Marcus 1947) to 10 ( Stylochus ellipticus , v. Name 1899; Bahr and Hillman 1966; Notoplana igiliensis , L. Galleni and I. Puccinelli, unpublished data; Hoploplana inquilinia , Patterson and Wieman 1912; all reviewed in Benazzi and Benazzi‐Lentati 1976). Remarkable is the variation in the genus Notoplana with two to 10 haploid chromsomes.…”

Section: Discussionmentioning

confidence: 73%

Chromosome fission or duplication in Macrostomum lignano (Macrostomorpha, Plathelminthes) - remarks on chromosome numbers in 'archoophoran turbellarians'

Egger

Ishida

2005

J Zoological System

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Mitotic metaphase plates of a new species of the genus Macrostomum were studied using conventional Giemsa staining, Orcein staining and semi‐thin sections stained after Richardson. Because of the ease in culturing it, this species has the potential to become the new model organism for developmental and evolutionary studies among the lower metazoa. The chromosome number was found to be 2n = 8. Reaching a relative length of 45.9% of the haploid genome size, the chromosomes of one pair were significantly larger than all other chromosomes. Of the smaller pairs, chromosomes of one pair were slightly larger (relative length of 21.3%) than the chromosomes of the remaining two pairs (each with a relative length of 16.4%). All chromosomes were metacentric (2m + 2m + 2m + 2m). For the first time, a diploid chromosome set of four pairs was described for the genus, as compared with previous studies showing predominantly 2n = 6 for 20 different Macrostomum species.

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Section: Discussionmentioning

confidence: 73%

Chromosome fission or duplication in Macrostomum lignano (Macrostomorpha, Plathelminthes) - remarks on chromosome numbers in 'archoophoran turbellarians'

Egger

Ishida

2005

J Zoological System

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“…Also in more recent papers, the main interest is in the problems of oogenesis and embryonic development (KATO 1940;CHRISTENSEN 1971) or spermatogenesis (BERTANI 1947); the last author, however, gives a short description of the karyotype of Thysanozoon brocchii, which comprises 8 pairs of meta-or submetacentric chromosomes and one pairs of acrocentric ones. BAHR and HILLMAN ( 1966) report the chromosome number of a species: Stylochus ellipticus, already studied by VAN NAME (1899).…”

Section: Discussionmentioning

confidence: 99%

Karyology ofNotoplana IgiliensisGalleni (Polycladida—Acotylea)

Galleni

Puccinelli

1975

Caryologia

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Karyological observations on Polyclads

Galleni

Puccinelli

1981

Hydrobiologia

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A karyological analysis of eight species of Polyclads has been carried out. A chromosome number of n = 10 for Stylochus alexandrinus and for Stylochus mediterraneus was ascertained on germinal lines.A chromosome number of 2n = 20 was ascertained from metaphasic plates from regenerative blastemas of Notoplana alcinoi and Leptoplana tremellaris. A karyometric analysis of this last species permitted the reconstruction of an idiogram.An idiogram was also prepared from metaphasic plates of Stylostomum ellipse obtained from early embryonic mitoses. The chromosome number of this species also was 2n = 20.Chromosome numbers of n = 8 and 2n = 16 were ascertained on germinal lines and metaphasic plates of blastemas in Echinoplana celerrima and on germinal lines and early embryonic mitoses of Stylochoplana maculata.Finally the diploid number 2n = 18 was ascertained on metaphasic plates from regenerative blastema of Yungia aurantiaca.

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Chromosome Number of Stylochus ellipticus (Girard)

Cited by 4 publications

References 0 publications

Chromosome fission or duplication in Macrostomum lignano (Macrostomorpha, Plathelminthes) - remarks on chromosome numbers in 'archoophoran turbellarians'

Chromosome fission or duplication in Macrostomum lignano (Macrostomorpha, Plathelminthes) - remarks on chromosome numbers in 'archoophoran turbellarians'

Karyology ofNotoplana IgiliensisGalleni (Polycladida—Acotylea)

Karyological observations on Polyclads

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