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The zoogeography of extant rhabdopleurid hemichordates (Pterobranchia:Graptolithina), with a new species from the Mediterranean Sea

Beli, E; Aglieri, G; Strano, F; Maggioni, D; Telford, MJ; Piraino, S; Cameron, CB; (2018) The zoogeography of extant rhabdopleurid hemichordates (Pterobranchia:Graptolithina), with a new species from the Mediterranean Sea. Invertebrate Systematics , 32 (1) pp. 100-110. 10.1071/IS17021. Green open access

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Abstract

The early origin and evolutionary radiation of graptolites (Hemichordata:Pterobranchia) is a story told almost entirely in the fossil record, but for four extant species of the genus Rhabdopleura Allman, 1869. Here we report the discovery of a fifth species, Rhabdopleura recondita, sp. nov., at a depth range of 2-70m from the Adriatic and Ionian Seas, always associated with bryozoans in coralligenous habitats. This is the first pterobranch record in Italian waters, and the second in the Mediterranean Sea. The new species is characterised by: (1) tubaria with smooth creeping tubes adherent to the inside of empty bryozoan zooecia; (2) erect outer tubes with a graptolite, fusellar-like organisation; and (3) zooids that extend from a black stolon, which is free from the creeping tube. Each of the paired feeding arms has two rows of tentacles that do not extend to the arm tip. The distal ends of the arms, the collar and the cephalic shield are replete with black granules. Phylogenetic analyses of individual and concatenated gene sequences of mitochondrial 16S rDNA and nuclear 18S rDNA support the validity of R. recondita as a new species. Finally, we discuss the global biogeographic and habitat distributions of the extant Rhabdopleura representatives.

Type: Article
Title: The zoogeography of extant rhabdopleurid hemichordates (Pterobranchia:Graptolithina), with a new species from the Mediterranean Sea
Open access status: An open access version is available from UCL Discovery
DOI: 10.1071/IS17021
Publisher version: https://doi.org/10.1071/IS17021
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: colonial hemichordates, DNA barcoding, integrative taxonomy, morphology, Rhabdopleuridae
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Genetics, Evolution and Environment
URI: https://discovery.ucl.ac.uk/id/eprint/10060172
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