Abstract

Helicarion Férussac, 1821 from southeastern Australia currently comprises five species of endemic semislugs. Analyses of comparative morphological data and partial sequences of the mitochondrial genes cytochrome c oxidase subunit I (COI) and 16S rRNA (16S) reveal that one of these species, Helicarion rubicundus Dartnall & Kershaw, 1978, which is restricted to southeastern Tasmania, is not closely related to the other known species of this genus. This species is distinguished from Helicarion in several key morphological characters, such as the bright two-toned red and green colouration of its larger body with a flattened tail that is keeled only at the tip, the triangular shape of the pneumostome, the degree and type of folding present in the spermoviduct and free oviduct, the presence of a longer, more slender bursa copulatrix, the presence of a small epiphallic caecum and a hooked flagellum, and the presence of irregular longitudinal pilasters in the penial interior in contrast to the v-shaped rows of papillose lamellae seen in Helicarion. Moreover, the mitochondrial phylogeny provides evidence that this species is phylogenetically distinct from Helicarion as well as any other currently described genus from southeastern Australia. Based on these findings, we here describe a new genus, Attenborougharion, for this species.

 
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Bibliographic Data

Short Form
Hyman and Köhler, 2017. Rec. Aust. Mus. 69(2): 65–72
Author
Isabel T. Hyman; Frank Köhler
Year
2017
Title
Attenborougharion gen. nov. (Mollusca: Pulmonata: Helicarionidae): a likely case of convergent evolution in southeastern Tasmania
Serial Title
Records of the Australian Museum
Volume
69
Issue
2
Start Page
65
End Page
72
DOI
10.3853/j.2201-4349.69.2017.1676
Language
EN
Date Published
09 August 2017
Cover Date
09 August 2017
ISSN
ISSN 0067-1975 (print); ISSN 2201-4349 (online)
CODEN
RAUMAJ
Publisher
The Australian Museum
Place Published
Sydney, Australia
Subjects
MALACOLOGY; TAXONOMY
Digitized
09 August 2017
Available Online
09 August 2017
Reference Number
1676
EndNote
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