Hooroo mates! Phylogenomic data suggest that the closest relatives of the iconic Tasmanian cave spider Hickmania troglodytes are in Australia and New Zealand, not in South America
Siddharth Kulkarni
A B and Gustavo Hormiga A
+ Author Affiliations
- Author Affiliations
A Department of Biological Sciences, The George Washington University, 2029 G Street NW, Washington, DC 20052, USA.
B Corresponding author. Email: sskspider@gwmail.gwu.edu
Invertebrate Systematics 35(8) 850-856 https://doi.org/10.1071/IS21030
Submitted: 15 April 2021 Accepted: 11 June 2021 Published: 5 November 2021
Abstract
Hickmania troglodytes is an emblematic cave spider representing a monotypic cribellate spider genus. This is the only Australian lineage of Austrochilidae while the other members of the family are found in southern South America. In addition to being the largest spider in Tasmania, Hickmania is an oddity in Austrochilidae because this is the only lineage in the family bearing posterior book lungs, tarsal spines and an embolar process on male pedipalps. Six-gene Sanger sequences and genome scale data such as ultraconserved elements (UCEs) and transcriptomes have suggested that Hickmania troglodytes is not nested with the family of current classification, Austrochilidae. We studied the phylogenetic placement of Hickmania troglodytes using an increased taxon sample by combining publicly available UCE and UCEs recovered from transcriptomic data in a parsimony and maximum likelihood framework. Based on our phylogenetic results we formally transfer Hickmania troglodytes from Austrochilidae to the family Gradungulidae. The cladistic placement of Hickmania in the family Gradungulidae fits the geographic distribution of both gradungulids (restricted to Australia and New Zealand) and austrochilids (restricted to southern South America) more appropriately.
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