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Meccanismi di Evoluzione del Cariotipo nei Monocelididi (Turbellaria Proseriata)
Curini-Galletti, M.C.; Martens, P.M.; Puccinelli, I. (1985). Meccanismi di Evoluzione del Cariotipo nei Monocelididi (Turbellaria Proseriata). Atti Soc. toscana sci. nat. resid. Pisa, Mem., Serie B 92: 291-297
In: Atti della Società toscana di scienze naturali residente in Pisa. Memorie. Serie B. Grafiche Pacini Editore: Pisa. ISSN 0365-7450, more
Peer reviewed article  

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Keywords
    Monocelididae Hofsten, 1907 [WoRMS]; Marine

Authors  Top 
  • Curini-Galletti, M.C.
  • Martens, P.M.
  • Puccinelli, I.

Abstract
    Mechanisms of karyotype evolution in the Monocelididae (Turbellaria Proseriata). Within the Proseriata (Turbellaria: Seriata), the family Monocelididae displays several interesting patterns of chromosomal evolution. A basic set of n = 3 -made up or one large metacentric, one medium-sized metacentric and one small clearly heterobrachial chromosome -has been detected. It is widely distributed in species pertaining to both the subfamilies in which the Monocelididae are subdivided. From this basic set, other complements -either with n = 3 or n > 3 -would be originated.Several karyological mechanisms or common occurrence within the family (translocations, small chromosome rearrangements involving the centromere, genome growth) have been detected. As to the chromosome complements with n > 3 -occurring within the subfamily Monocelidinae -they can be interpreted as the result of a fission of one or both the metacentric chromosomes of the basic set. Karyometrical data are in good agreement with this suggestion. Centric fusion or polyploidy, well known for fresh- water Triclads, have been never found in the family.

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