World Congress of Malacology Antwerp ... - Unitas Malacologica

MYBP, so the early origins and elaborations of eyes is obscured by their ancient history. The fact that
chitons have hundreds of eyes, their relatively recent dual origins, and the extent of variation in ocelli
morphology across at least Acanthopleurinae, are all reasons that chiton ocelli could be useful models
for investigating the origin and elaboration of eyes in animals.
Molecular phylogeny and biogeography of the polytypic genus Pyrenaearia
Elejalde, M. Arantzazu 1 ; Madeira, María José 1 ; Prieto, Carlos E. 2 ; Backeljau, Thierry 3 ;
Gómez-Moliner, Benjamín J. 1
1 . Dpto. Zoología y Biología Celular Animal, Facultad de Farmacia, Universidad del País Vasco,
Paseo de la Universidad 7, 01006 Vitoria, Álava, Spain,
Email: zobelcaa@ehu.es
2 . Dpto. Zoología y Biología Celular Animal, Facultad Ciencia y Tecnología, Universidad del País
Vasco, Barrio de Sarriena s/n, Apdo 644, 48080 Vizcaya, Spain,
Email: carlos.prieto@ehu.es
3 . Royal Belgian Institute of Natural Sciences, Vautierstraat 29, B-1000 Brussels, Belgium,
Email: Thierry.Backeljau@naturalsciences.be
The land snail genus Pyrenaearia is an endemism of the northern mountains of the Iberian Peninsula.
As many as 12-16 species are currently recognised within this genus, which are exclusively
differentiated on the basis of shell morphology. Many of them are living above 1.000 m of altitude,
while others show a wide altitudinal range and still a few others are restricted to small valleys. We
have examined the nucleotide sequences of mtDNA (16S and COI) and the ITS-I region of the
nuclear DNA in order to reconstruct the evolutionary history of the genus. Phylogenetic relationships
have been inferred using maximum parsimony, neighbour joining, maximum likelihood and Bayesian
methods. These analyses suggested eight main phylogroups: One restricted to the Cantabrian
mountains, one restricted to the hills in the pre-litoral mountain system of Catalonia, a third group is
located in the Moncayo mountains (Iberian System) and the other five phylogroups occur in the
Pyrenees and pre-Pyrenees. A nested clade analysis based on mtDNA sequences has been performed
to infer phylogeographic patterns. The speciation process and the biogeography of Pyrenaearia are
discussed in relation to the Pleistocene glaciation events.
This work has been financed by the Basque Country University (Projects: 1/UPV 0076.125-EA-
7876/2000; 1/UPV 00076.310-E-15256/2003 and GIU06/09).
Phylogenetic relationships and evolution of Iberus species based on mtDNA sequences
Elejalde, M. Arantzazu 1 ; Madeira, María José 1 ; Muñoz, Benito 2 ; Arrébola, Jose Ramón 3 ;
Gómez-Moliner, Benjamín J. 1
1 . Dpto. Zoología y Biología Celular Animal, Facultad de Farmacia, Universidad del País Vasco,
Paseo de la Universidad 7, 01006 Vitoria, Álava, Spain,
Email: zobelcaa@ehu.es
2 . Dpto Biología Animal 1, Facultad de Biología, Universidad. Complutense Madrid, Jose Antonio
Novais 2, 28040 Madrid, Spain,
Email: titomu@bio.ucm.es
3 . Dpto. Fisiología y Biología Animal, Facultad de Biología, Universidad de Sevilla, Avda Reina
Mercedes s/n, 41012 Sevilla, Spain,
Email: mastus@us.es
DNA sequences of two mitochondrial genes (COI and 16S rRNA) from 59 specimens of Iberus were
used to test the validity of the medium-sized morphospecies of the genus and to study the genetic
divergences within and between main phylogenetic groups. All the morphospecies of medium size
were included in the study: I. angustatus, I. cobosi, I. guiraoanus, I. loxanus, I. marmoratus, I. ortizi,
56