Australian Museum Journal Attenborougharion gen. nov. (Mollusca: Pulmonata: Helicarionidae): a likely case of convergent evolution in southeastern Tasmania

Shortform:
Hyman and Köhler, 2017. Rec. Aust. Mus. 69(2): 65–72
Author(s):
Isabel T. Hyman; Frank Köhler
Year published:
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 package:
EndNote file
Title page:
Title page (204kb PDF)
Complete work:
Complete work (3660kb PDF)

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.

Last Updated: