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A reappraisal of the systematics of the Monocelididae (Platyhelminthes, Proseriata): inferences from rDNA sequences
Litvaitis, M.K.; Curini-Galletti, M.C.; Martens, P.M.; Kocher, T.D. (1996). A reappraisal of the systematics of the Monocelididae (Platyhelminthes, Proseriata): inferences from rDNA sequences, in: [s.d.] IZWO Collected Reprints. 26: pp. chapter 28
In: IZWO Collected Reprints. Instituut voor Zeewetenschappelijk Onderzoek: Bredene. ISSN 0772-1250, more

Also published as
  • Litvaitis, M.K.; Curini-Galletti, M.C.; Martens, P.M.; Kocher, T.D. (1996). A reappraisal of the systematics of the Monocelididae (Platyhelminthes, Proseriata): inferences from rDNA sequences. Mol. Phylogenet. Evol. 6(1): 150-156, more

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Keywords
    Taxonomy; Monocelididae Hofsten, 1907 [WoRMS]; Marine; Brackish water; Fresh water

Authors  Top 
  • Litvaitis, M.K.
  • Curini-Galletti, M.C.
  • Martens, P.M.
  • Kocher, T.D.

Abstract
    The current classification system for the Monocelididae which is based on the character "presence or absence of an accessory prostatoid organ" divides the family into two subfamilies, namely the Minoninae and the Monocelididinae. However, other characters relating to the structure of the male copulatory bulb and to karyotypes do not support this division. Monocelidid male copulatory bulbs can be either of the simplex or the duplex-type, and if this character is mapped onto the current classification, then both subfamilies contain species with either type of copulatory bulb. We therefore decided to construct an independent phylogeny for the Monocelididae using nucleotide-sequence data of the gene coding for the 26/28S rDNA. Distance and parsimony-based analysis resulted in phylogenetic trees that strongly supported a division of the Monocelididae based on characters of the male copulatory bulb and not on the accessory prostatoid organ. Thus, all species possessing a simplex-type copulatory bulb cluster together into one monophyletic group, the Monocelidinae (sensu Midelburg), whereas species characterized by a duplex-type copulatory bulb constitute a paraphyletic assemblage.

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