An integrated morphological–molecular approach reveals new insights on the systematics of the octocoral Telestula humilis (Thomson, 1927) (Octocorallia : Alcyonacea : Clavulariidae)
Angelo Poliseno
A B H , Alvaro Altuna C , Lara C. Puetz A , Sarah S. T. Mak A , Pilar Ríos D , Emily Petroni E , Catherine S. McFadden E , Martin V. Sørensen F and M. Thomas P. Gilbert A G
+ Author Affiliations
- Author Affiliations
A Centre for Evolutionary Hologenomics, The GLOBE Institute, University of Copenhagen, Øster Farimagsgade 5A, DK-1352 Copenhagen, Denmark.
B Molecular Invertebrate Systematics and Ecology Laboratory, Graduate School of Engineering and Science, University of the Ryukyus, 1 Senbaru, JP-903-0213, Nishihara, Japan.
C INSUB, Zemoria 12, E-20013 San Sebastián, Spain.
D Instituto Español de Oceanografía, Centro Oceanográfico de Gijón, Príncipe de Asturias 70 bis, E-33212 Gijón, Spain.
E Department of Biology, Harvey Mudd College, Claremont, CA 91711, USA.
F Natural History Museum of Denmark, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen, Denmark.
G University Museum, NTNU, Shøninghuset, B-224, Erling Skakkes gate 47A, NO-7012 Trondheim, Norway.
H Corresponding author. Email: a.poliseno.ita@gmail.com
Invertebrate Systematics 35(3) 261-281 https://doi.org/10.1071/IS20009
Submitted: 26 February 2020 Accepted: 5 October 2020 Published: 24 March 2021
Abstract
Telestula humilis (Thomson, 1927) is a rare deep-sea stoloniferan octocoral distributed in the eastern Atlantic. Here we compared seven putative colonies of this species collected off Spain with the lectotype from the Oceanographic Museum of Monaco and found them to be identical morphologically. Phylogenetic analyses on both full mitogenomes and a concatenated alignment containing two mtDNA genes (mtMutS and Cox1) and nuclear 28S rRNA gene recovered Telestula humilis sister to Incrustatus and Inconstantia rather than to other species of Telestula. This therefore supports its taxonomic reassignment to Pseudotelestula gen. nov. as Pseudotelestula humilis comb. nov. The taxonomic reassignment is also supported by subtle differences observed between the morphology of the colony and the sclerome of Pseudotelestula humilis comb. nov. and the two sister genera. The occurrence of an intrusion tissue with sclerites in the basal part of the gastric cavity of the adult polyps is shared among Telestula and Pseudotelestula gen. nov. However, Pseudotelestula gen. nov. has sclerites arranged in a collaret and points below the tentacles, the sclerites of the calyx wall and the stolon are plump warty spindles, and the intrusion tissue has long sticks and spindles with cone-like spines.
Keywords: Cnidaria, mitochondrial genome, molecular phylogenetics, systematics, taxonomy.
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