TY - JOUR
T1 - Genus-level phylogeny of cephalopods using molecular markers
T2 - Current status and problematic areas
AU - Sanchez, Gustavo
AU - Setiamarga, Davin H.E.
AU - Tuanapaya, Surangkana
AU - Tongtherm, Kittichai
AU - Winkelmann, Inger E.
AU - Schmidbaur, Hannah
AU - Umino, Tetsuya
AU - Albertin, Caroline
AU - Allcock, Louise
AU - Perales-Raya, Catalina
AU - Gleadall, Ian
AU - Strugnell, Jan M.
AU - Simakov, Oleg
AU - Nabhitabhata, Jaruwat
N1 - Publisher Copyright:
© 2018 Sanchez et al.
PY - 2018
Y1 - 2018
N2 - Comprising more than 800 extant species, the class Cephalopoda (octopuses, squid, cuttlefish, and nautiluses) is a fascinating group of marine conchiferan mollusks. Recently, the first cephalopod genome (of Octopus bimaculoides) was published, providing a genomic framework, which will enable more detailed investigations of cephalopod characteristics, including developmental, morphological, and behavioural traits. Meanwhile, a robust phylogeny of the members of the subclass Coleoidea (octopuses, squid, cuttlefishes) is crucial for comparative and evolutionary studies aiming to investigate the group's traits and innovations, but such a phylogeny has proven very challenging to obtain. Here, we present the results of phylogenetic inference at the genus level using mitochondrial and nuclear marker sequences available from public databases. Topologies are presented which show support for (1) the monophyly of the two main superorders, Octobrachia and Decabrachia, and (2) some of the interrelationships at the family level. We have mapped morphological characters onto the tree and conducted molecular dating analyses, obtaining congruent results with previous estimates of divergence in major lineages. Our study also identifies unresolved phylogenetic relationships within the cephalopod phylogeny and insufficient taxonomic sampling among squids excluding the Loliginidae in the Decabrachia and within the Order Cirromorphida in the Octobrachia. Genomic and transcriptomic resources should enable resolution of these issues in the relatively near future. We provide our alignment as an open access resource, to allow other researchers to reconstruct phylogenetic trees upon this work in the future.
AB - Comprising more than 800 extant species, the class Cephalopoda (octopuses, squid, cuttlefish, and nautiluses) is a fascinating group of marine conchiferan mollusks. Recently, the first cephalopod genome (of Octopus bimaculoides) was published, providing a genomic framework, which will enable more detailed investigations of cephalopod characteristics, including developmental, morphological, and behavioural traits. Meanwhile, a robust phylogeny of the members of the subclass Coleoidea (octopuses, squid, cuttlefishes) is crucial for comparative and evolutionary studies aiming to investigate the group's traits and innovations, but such a phylogeny has proven very challenging to obtain. Here, we present the results of phylogenetic inference at the genus level using mitochondrial and nuclear marker sequences available from public databases. Topologies are presented which show support for (1) the monophyly of the two main superorders, Octobrachia and Decabrachia, and (2) some of the interrelationships at the family level. We have mapped morphological characters onto the tree and conducted molecular dating analyses, obtaining congruent results with previous estimates of divergence in major lineages. Our study also identifies unresolved phylogenetic relationships within the cephalopod phylogeny and insufficient taxonomic sampling among squids excluding the Loliginidae in the Decabrachia and within the Order Cirromorphida in the Octobrachia. Genomic and transcriptomic resources should enable resolution of these issues in the relatively near future. We provide our alignment as an open access resource, to allow other researchers to reconstruct phylogenetic trees upon this work in the future.
KW - Cephalopods
KW - Molecular markers
KW - Phylogeny
UR - http://www.scopus.com/inward/record.url?scp=85041544213&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85041544213&partnerID=8YFLogxK
U2 - 10.7717/peerj.4331
DO - 10.7717/peerj.4331
M3 - Article
AN - SCOPUS:85041544213
VL - 2018
JO - PeerJ
JF - PeerJ
SN - 2167-8359
IS - 2
M1 - e4331
ER -