Integrative taxonomy of the cycad-associated weevils of the Tranes group, with a revision of Tranes Schoenherr, a key to all taxa and an assessment of host specificity in the group (Coleoptera: Curculionidae: Molytinae)

Yun Hsiao; Rolf G. Oberprieler

doi:10.1071/IS24078

RESEARCH ARTICLE (Open Access)

Previous Next Contents Vol 39(2)

Integrative taxonomy of the cycad-associated weevils of the Tranes group, with a revision of Tranes Schoenherr, a key to all taxa and an assessment of host specificity in the group (Coleoptera: Curculionidae: Molytinae)

Yun Hsiao

^A ^B ^C ^* and Rolf G. Oberprieler ^B ^*

+ Author Affiliations

- Author Affiliations

^A Institute of Ecology and Evolutionary Biology, National Taiwan University, Taipei, Taiwan.

^B Australian National Insect Collection, CSIRO, GPO Box 1700, Canberra, ACT 2601, Australia.

^C Division of Ecology and Evolution, Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia.

^* Correspondence to: yunhsiao@outlook.com, ausweevil@gmail.com, rolf.oberprieler@csiro.au

Handling Editor: Bruno Medeiros

Invertebrate Systematics 39, IS24078 https://doi.org/10.1071/IS24078

Submitted: 18 September 2024 Accepted: 7 January 2025 Published: 18 February 2025

© 2025 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

Australia is a main centre of diversity for extant cycads (Cycadophyta), harbouring 4 genera and 85 named species and subspecies. Three cycad genera, Bowenia, Lepidozamia and Macrozamia, serve as hosts for four weevil genera of the Tranes group, Tranes Schoenherr, Miltotranes Zimmerman, Demyrsus Pascoe and Siraton Hustache. Several morphologically based taxonomic studies have been undertaken on some of these genera recently, but their classification, diversity and species delineations have not been evaluated using an integrative taxonomic approach. In the present study, we combine morphological characters and mitochondrial DNA data to assess the taxonomic status of taxa in this group. Different methods of molecular species delimitation, especially distance-based ones, generally provide strong support for taxon concepts derived from morphological characteristics, demonstrating that these are well able to delineate natural species and assess taxonomic diversity in this group of weevils. Exceptions are that molecular analyses indicate Siraton internatus (Pascoe) to be more closely related to Demyrsus than to S. roei (Boheman), rendering Siraton a paraphyletic taxon, and a genetically distinct but morphologically cryptic species of Miltotranes to occur south of Cairns. A key to all genera and species of the Tranes group is presented. The genus Tranes and its four previously named species are redescribed and six species are newly described, T. chadwicki sp. nov., T. forsteri sp. nov., T. kgariensis sp. nov., T. occidentalis sp. nov., T. terryae sp. nov. and T. tinctipennis sp. nov., and a lectotype is designated for the name Tranes insignipes Lea, 1929. The salient characters and distribution ranges of all Tranes species are illustrated, and their host specificities are assessed.

ZooBank: urn:lsid:zoobank.org:pub:45DE986E-A8B3-4247-B056-DF3126D4B31D

Keywords: Australia, cryptic species, cycad weevils, identification key, mitochondrial DNA, morphology, new species, taxonomy, species delineation.

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