Bibliographic Detail
Pellizzari, F., Oliveira, M.C., Medeiros, A. da S., Yokoya, N.S. & Oliveira, E.C., 2013
Reference:
Pellizzari, F., Oliveira, M.C., Medeiros, A. da S., Yokoya, N.S. & Oliveira, E.C. (2013). Morphology, ontogeny, and phylogenetic position of Gayralia brasiliensis sp. nov. (Ulotrichales, Chlorophyta) from the southern coast of Brazil. Botanica Marina 56(2): 197.
Abstract:
A new species, Gayralia brasiliensis (Ulotrichales,
Chlorophyta), is described from Brazil on the basis of
ontogenetic, morphological, and molecular phylogenetic
data. Liberation of zooids from the monostromatically
bladed thalli occurred by disintegration of the zooidangium
wall, releasing four biflagellate cells with prominent
eyespots. Fusion of zooids was not observed. After zooid
attachment, cell divisions gave rise to uniseriate filaments
that developed into fan-shaped blades. Only asexual
reproduction was observed; this took place through recycling
of blades by germination of zooids. Phylogenetic
analysis based on rDNA internal transcribed spacer (ITS)
sequences showed that G. brasiliensis specimens formed a
monophyletic group closely related to Monostroma nitidum
and two unidentified monostromatic species from Japan
and Tanzania. The genus Monostroma was polyphyletic in
our analysis. ITS sequences also confirmed the presence of
a second monostromatic species of Ulotrichales in the Brazilian
coast, Gayralia oxysperma . There were overlapping
morphological and life history traits between G. brasiliensis
and G. oxysperma . However, these two species were
clearly divergent based on ITS sequences and ontogeny.