The reevaluation of Salacia lombardii (Celastraceae) based on phylogenetic position and biogeographic implications
Por:
Hernandez-Damian, Ana Lilia, Martinez-Gordillo, Martha Juana, Ochoterena, Helga, Silvestre Cevallos-Ferriz S.R.
Publicada:
1 oct 2022
Resumen:
Biological inclusions preserved in the amber deposits from Chiapas,
Mexico, provide evidence of a tropical environment at low latitudes in
North America during the Miocene. Unfortunately, they have a scarce
fossil record of plants, and most of them have been related to the
extant taxa of the Neotropical region. However, this idea has not been
evaluated through a phylogenetic context until now. Here, we analyzed
the phylogenetic position of Salacia lombardii, a Miocene flower
identified as an extinct species of Salacioideae (Celastraceae), which
typically has flowers with a pentamerous perianth and trimerous
androecium; nevertheless, a small set of taxa including S. lombardii
have only two stamens. To evaluate the relationship between fossils with
their po-tential near relatives, we used a combined matrix previously
generated with molecular data combined with morphological characters
from 6 genera and 28 species of Salacioideae through Parsimony and
Bayesian criteria. The topologies of trees reported here are consistent
with previous analyses for Salacioideae, recovering two clades:
Neotropical and taxa with two-stamens. Salacia lombardii has an
ambiguous position causing a polytomy in the strict consensus of
Parsimony analysis. Nevertheless, there are only two alternative
positions of the fossil in the MPTs (Most Parsimonious Trees): 1) as a
sister group of Salacioideae or 2) as the sister group of clade from
which Sarawakodendron and Salacioideae diverged. The latter is
comparable with the tree of Bayesian analysis. Based on the criterion of
topological congruence between Parsimony and Bayesian approaches, we
support the second hypothesis, which suggests that Salacia lombardii
occupies a transitional position between Salacioideae and
Hippocrateoideae, as well as its close relationship with the
Paleotropical region.
Filiaciones:
Hernandez-Damian, Ana Lilia:
Departamento de Paleontología, Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Circuito de la Investigación Científica, CDMX, Coyoacán, 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Geol, Dept Paleontol, Ciudad Univ, Coyoacan 04510, Cdmx, Mexico
Martinez-Gordillo, Martha Juana:
Herbario de La Facultad de Ciencias, Facultad de Ciencias, Universidad Nacional Autónoma de México, Apartado Postal 70-399, CDMX, C.P. 04510, Mexico
Univ Nacl Autonoma Mexico, Herbario Fac Ciencias, Fac Ciencias, Apartado Postal 70-399, Cdmx 04510, Mexico
Ochoterena, Helga:
Instituto de Biología, Universidad Nacional Autónoma de México, Apartado Postal 70-367, CDMX, CP 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Biol, Apartado Postal 70-367, Cdmx 04510, Mexico
Silvestre Cevallos-Ferriz S.R.:
Departamento de Paleontología, Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Circuito de la Investigación Científica, CDMX, Coyoacán, 04510, Mexico
|