Ricerche Sulla Ovogenesi e Sulla Fecondazione Nella Planaria<i>Polycelis Nigra</i>Ehrenberg con Particolare Riguardo All'Ufficio del Nucleo Spermatico

Lepori, N. G.

doi:10.1080/00087114.1949.10797513

Cited by 24 publications

(5 citation statements)

References 3 publications

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“…Together with a population from Luxemburg (Hoffmann, 1964) and Switzerland (Melander, 1963), as well as our sample from the Netherlands, these are the only reports of sexual diploids (2× = 16) outside of Italy. Our data confirm the abundance and ubiquity of P. nigra in Italy, where pure diploid, pure polyploid (3× and 4×) and mixed populations occur, and corroborate the data of Canovai (1989), Canovai & Galleni (1988), Canovai et al (1985), Lepori (1949Lepori ( , 1950, and Melander (1963). We report for the first time polyploids from Great Britain.…”

Section: Ploidy Forms and Geographical Distributionsupporting

confidence: 80%

“…The haploid chromosome complement of P. nigra is n = 8 (Benazzi, 1963;Benazzi & Benazzi Lentati, 1976;Le Moigne, 1962), and this basic chromosome number has been documented in individuals from several European localities (Lepori, 1949(Lepori, , 1950(Lepori, , 1954a(Lepori, ,b, 1955, including Italy (Canovai, 1989;Canovai & Galleni, 1988;Canovai et al, 1985), southern Sweden (Melander, 1963), the Netherlands (De Vries, 1985 and Van der Velde), and France (Dutrilleux & Lenicque, 1971;Le Moigne, 1962;Lepori, 1954a). In addition to the basic karyotype, supernumerary (B) chromosomes (Jones & Rees, 1982) of variable morphology (Canovai, 1989;Canovai et al, 1985) have been described in diploids and polyploids from different populations.…”

Section: Introductionmentioning

confidence: 99%

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1998

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Section: Ploidy Forms and Geographical Distributionsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Untitled

1998

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“…In these species, various types of polyploidy and heteroploidy, and chromosome number variations from different localities have been reported (Schleip 1907;Rappeport 1915;Melander 1950;Lepori 1949Lepori , 1955Dahm 1958;Le Moigne 1962;Benazzi 1963;also see Benazzl & Lentati 1976). The karyotypes of P. auriculata show little similarity with those of the abovementioned European species or with those of the other species of the genus Polycelis found in Japan (Teshirogi et al 1978(Teshirogi et al , 1979Nimura 1978Nimura , 1979.…”

Section: Discussionmentioning

confidence: 94%

Studies on the speciation of Japanese freshwater planarian Polycelis auriculata based on the analysis of its karyotypes and constitutive proteins

Teshirogi¹,

Ishida²

1981

Hydrobiologia

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Various kinds of chromosomal polymorphisms or karyotypic variations are found in the Japanese freshwater planarian Polycelis auriculata. Within this species, there are found worms whose chromosome numbers are 2n = 6, 10, 11, 12 and others, and 3x = 6 and 9. There are some which have cells with triploidy and tetraploidy complements (3x = 6 & 4x = 8), and others which have cells with triploidy and hexaploidy complements (3x = 6 & 6x = 12). These worms with such varied karyotypes are usually found in separate habitats, though occasionally they occur together. Electrophoretic analysis of the proteins extracted from the karyotypically different worms which belong to three different local populations shows some dissimilarity in the constitutive proteins according to their karyotypic differences. The results obtained suggest that this species is still in the process of speciation or chromosomal evolution.

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“…The European species P. nigra, P. tenuis, and P. felina have been reported to have polymorphisms including polyploids and aneuploids (Schleip, 1907;Rappeport, 1915;Melander, 1950;Lepori, 1949Lepori, , 1955Dahm, 1958;Le Moigne, 1962;Benazzi, 1963;Benazzi & Benazzi-Lentati, 1976). Oki et al (198 1) reported mixoploids of 2n = 6 and 2n = 10 in P. auriculata collected at Nikko.…”

Section: B) From Yamadamentioning

confidence: 99%

Further survey of chromosomal polymorphisms in the freshwater planarian Polycelis auriculata

1991

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Although the chromosomal number of Polycelis (Seidlia) auriculata Ijima et Kaburaki is basically 2n = 6, this species shows remarkable chromosomal polymorphisms in different populations. Among worms collected at 30 stations in the central part of Japan's Main Island and in Hokkaido, we found five new kwotypes, considered to be variations of tetraploidy and diploidy: 4n?fis'. + 1 = 3SM + 2A + 3T, + 2T, + 4M = 14, 4n?fis*.(B) = 2SM + 2A + 4T, + 2T, + 4M + (O-2B) = 14 -16, 4n?fis*. + 1 = 2SM + 2A + 4Ti + 2T, + 5M = 15,4n?fis*.-2 = 2SM + 2A + 4T, + 4M = 12, and 2nM-= 2SM + 2A = 4 (where SM = submetacentric; A = acrocentric; T, and T, = telocentric; M = metacentric; B = Bchromosome; fis'. and fis*. = occurrence of one or two centric fissions, respectively; and M-= deletion of a metacentric chromosome). These karyotypes exist singly in one individual or as various mixoploids within the same individual. No individual having only karyotype 2nM-has yet been found. This brings the total number of known karyotypes in P. auriculata to 17; these can be arranged in an order that we believe reflects their evolution.

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Ricerche Sulla Ovogenesi e Sulla Fecondazione Nella PlanariaPolycelis NigraEhrenberg con Particolare Riguardo All'Ufficio del Nucleo Spermatico

Cited by 24 publications

References 3 publications

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Studies on the speciation of Japanese freshwater planarian Polycelis auriculata based on the analysis of its karyotypes and constitutive proteins

Further survey of chromosomal polymorphisms in the freshwater planarian Polycelis auriculata

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