Data di Pubblicazione:
2004
Citazione:
The phylogeny of Branchiobdellida (Annelida, Clitellata) assessed by sperm characters / A. Cardini, M. Ferraguti. - In: ZOOLOGISCHER ANZEIGER. - ISSN 0044-5231. - 243:1-2(2004), pp. 37-46.
Abstract:
Data on the spermatozoa of Branchiobdellida were taken from the published literature: sperm models of 25 species
belonging to 13 different branchiobdellidan genera have been compared with the aim of supplying further evidences for
a phylogenetic analysis of the group. The species considered were representative of all traditional branchiobdellidan
families, excluding the monotypic Caridinophilidae. Branchiobdellidan spermatozoa are complex cells, thus it was
possible to analyse the variation of 20 characters within the group. A parsimony analysis has yielded nine minimal
trees, eight of which are very similar to one another. The main conclusions of the phylogenetic analysis are: (a) the
monophyly of the taxon Branchiobdellida is confirmed; (b) the most speciose branchiobdellidan genus, Cambarincola
is polyphyletic; (c) none of the traditional ‘families’ are supported; (d) the genus Branchiobdella is monophyletic, but
the position of one species, B. kobayashi, albeit basal to the whole genus, is not resolved; (e) the other two genera
analysed for which more than one species was available, Pterodrilus and Xironogiton, are monophyletic; (f) there seems
to be a ‘trend’ in the whole group towards an increase of acrosome length. Our results partly parallel those obtained by
Gelder and Siddall (2000) with a combined analysis of molecular and somatic characters, and point to the need for a
comprehensive revision of the Branchiobdellida based on a combination of molecular, somatic and spermatological
data sets.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Spermatozoa ; Structure ; Branchiobdellidans ; Rates of evolution
Elenco autori:
A. Cardini, M. Ferraguti
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