The chromosome morphology and number in somatic and germinal cells were studied in some species of Macrobiotus. Most of these species ((M. areolatus, M. coronifer, M. harmsworthi, M. hufelandi, and the bisexual biotype of M. richtersi) have 2n = 12 chromosomes, but in two freswater species with similar morphology (M. dispar and M. pullari) 2n = 10 chromosomes are found. The chromosome number in males and females of M. areolatus and M. richtersi is the same. In the ripening oocytes and in the first blastomeres the metaphasic chromosomes show a peculiar large size. No idiograms were made because the chromosomes are too small, similar and without detectable centromeres.
Osservazioni cariologiche su alcuni Macrobiotus (Tardigrada) / Bertolani, Roberto. - In: ATTI DELLA ACCADEMIA NAZIONALE DEI LINCEI. RENDICONTI DELLA CLASSE DI SCIENZE FISICHE, MATEMATICHE E NATURALI. - ISSN 0392-7881. - STAMPA. - 52:(1972), pp. 220-224.
Osservazioni cariologiche su alcuni Macrobiotus (Tardigrada).
BERTOLANI, Roberto
1972
Abstract
The chromosome morphology and number in somatic and germinal cells were studied in some species of Macrobiotus. Most of these species ((M. areolatus, M. coronifer, M. harmsworthi, M. hufelandi, and the bisexual biotype of M. richtersi) have 2n = 12 chromosomes, but in two freswater species with similar morphology (M. dispar and M. pullari) 2n = 10 chromosomes are found. The chromosome number in males and females of M. areolatus and M. richtersi is the same. In the ripening oocytes and in the first blastomeres the metaphasic chromosomes show a peculiar large size. No idiograms were made because the chromosomes are too small, similar and without detectable centromeres.
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