Delphinid systematics and biogeography with a focus on the current genus Lagenorhynchus: Multiple pathways for antitropical and trans-oceanic radiation

Abstract

. (2014) 'Delphinid systematics and biogeography with a focus on the current genus Lagenorhynchus : multiple pathways for antitropical and trans-oceanic radiation.', Molecular phylogenetics and evolution., 80 . pp. 217-230. Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. The six species currently classified within the genus Lagenorhynchus exhibit a pattern of 3 antitropical distribution common among marine taxa. In spite of their morphological similarities they 4 are now considered an artificial grouping, and include both recent and the oldest representatives of the 5 Delphinidae radiation. They are, therefore, a good model for studying questions about the evolutionary 6 processes that have driven dolphin speciation, dispersion and distribution. Here we used two different 7 approaches. First we constructed a multigenic phylogeny with a minimum amount of missing data 8 (based on 9 genes, 11030bp, using the 6 species of the genus and their closest relatives) to infer their 9 relationships. Second, we built a supermatrix phylogeny (based on 33 species and 27 genes) to test the 10 effect of taxon sampling on the phylogeny of the genus, to provide inference on biogeographic history, 11 and provide inference on the main events shaping the dispersion and radiation of delphinids.

Can habitat characteristics shape vertebral morphology in dolphins? An example of two phylogenetically related species from southern South America

“…, Harling‐Cognato and Honeycutt , McGowen , Banguera‐Hinestroza et al . ). These studies suggest that these species should be placed together in a separate genus, Sagmatias and strongly support the monophyly of the clade conformed by L. australis and L. cruciger .…”

“…, Harling‐Cognato and Honeycutt , McGowen , Banguera‐Hinestroza et al . ), and its phylogenetic status among the other cetacean families has been broadly discussed (Caballero et al . ).…”

“…The genus Lagenorhynchus currently includes six species: the white-beaked dolphin (L. albirostris), the Atlantic white-sided dolphin (L. acutus), the Pacific white-sided dolphin (L. obliquidens), the dusky dolphin (L. obscurus), the Peale's dolphin (L. australis), and the hourglass dolphin (L. cruciger) (Committee on Taxonomy 2016). This genus, though, is considered to be polyphyletic (LeDuc et al 1999, Pichler et al 2001, Harling-Cognato and Honeycutt 2006, McGowen 2011, Banguera-Hinestroza et al 2014, and its phylogenetic status among the other cetacean families has been broadly discussed (Caballero et al 2008). Only the latter four species listed above are closely related to each other, based on mitochondrial and nuclear DNA data studies (LeDuc et al 1999, Harling-Cognato and Honeycutt 2006, McGowen 2011, Banguera-Hinestroza et al 2014.…”

Skull shapes of the Lissodelphininae: radiation, adaptation and asymmetry

“…The erection of the subfamily Lissodelphininae was proposed by LeDuc et al (1999) after the first comprehensive molecular analysis of the relationships among the Delphinidae. Subsequent molecu-lar analyses have consistently confirmed the monophyletic status of the group within Delphinidae (Harlin-Cognato andHoneycutt, 2006, McGowen et al, 2009;Steeman et al, 2009;McGowen, 2011;Banguera-Hinestroza et al, 2014). The diversification of the Lissodelphininae within Delphinidae is part of the explosive delphinid radiation during the last 11 million years; most of the radiation within Lissodelphininae is estimated to have occurred over the last 4 million years (McGowen et al, 2009;Steeman et al, 2009).…”

Skull ontogeny and modularity in two species ofLagenorhynchus: Morphological and ecological implications

“…The genus Lagenorhychus Gray 1828 includes six species ( Lagenorhynchus acutus, Lagenorhynchus albirostris, Lagenorhynchus australis, Lagenorhynchus cruciger, Lagenorhynchus obliquidens and Lagenorhynchus obscurus ) that have an antitropical distribution (Leatherwood et al, ) and a fossil record dating from the Pleistocene of Europe (Uhen et al, ). Several recent molecular studies suggest that the genus, as currently recognized, is an artificial grouping (e.g., Cipriano, ; McGowen et al, ; Banguera‐Hinestroza et al, ). Phylogenetic studies suggest that the North Atlantic L. acutus and L. albirostris comprise the earliest diverging lineages within Delphinidae, and outside of the clade Lissodelphinae, whereas the remaining four species are members of the subfamily Lissodelphininae, which includes the genera Lissodelphis and Cephalorhynchus .…”