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Tiny minotaurs and mini-Casanovas: Ancient pigmy moths reveal secrets of their diversity

Date:
March 18, 2013
Source:
Pensoft Publishers
Summary:
Strange thickened antennae like bulls' horns and mustache-like scent scales are amongst the romantic armory of males of Australia's tiniest moths, as revealed in a new study of their diversity and evolution. The arid continent has provided an ideal home for the ancient pigmy moths, which have taken to Eucalyptus and related plants as hosts for their leaf-mining caterpillars, and diversified into at least 140 species.

Romantic bouquet: The male Pectinivalva minotaurus has two kinds of shell-like scent scales on the abdomen to woo the female.
Credit: Landcare Research and Naturalis Biodiversity Center, CC-BY 3.0

Researchers Robert Hoare (Landcare Research, New Zealand) and Erik van Nieukerken (Naturalis Biodiversity Center, Netherlands) have named new moths after the Minotaur of Greek mythology and the legendary Italian philanderer Giacomo Casanova in a study of the evolution of southern pigmy moths. The study was published in the open access journal ZooKeys.

The tiny moths, with wingspans of 3 to 8 millimetres, belong to a very old group (the family Nepticulidae), which dates back more than 110 million years to the time of the dinosaurs. Australian pigmy moths are particularly diverse and unusual, and one group (genus Pectinivalva, 'ancient pigmy moths') has until now only been reported from that continent, where over 140 species are known.Each species of pigmy moth is associated with one or a few related species of plant on which they lay their eggs. Caterpillars make a mine inside the leaf, the shape of the mine often being characteristic of the species that made it.

By reconstructing the evolution of the ancient pigmy moths, Hoare and van Nieukerken have shown that the original host of the group was probably a rainforest plant of the myrtle family (Myrtaceae). As Australia dried out from about 15 million years ago, the rainforest was greatly reduced in extent, and the myrtle family came to dominate the vegetation of the arid interior, with the now familiar eucalyptus trees becoming especially diverse and abundant. The ancient pigmy moths in their turn transferred to the newly dominant host-plants, and now most known species of Pectinivalva feed on Eucalyptus and its close relatives, with just a few still attached to rainforest myrtles. Probably, the rainforests of Indonesia, New Guinea and New Caledonia will be found to be home to further undiscovered members of the genus Pectinivalva; a new species (P. xenadelpha) from Borneo is the first non-Australian member of the genus known.

What of those new names? The males of many species of ancient pigmy moths display special scales for close-range scent dispersal during courtship of the female. These can be on the front legs, on the wings or on the body of the moth, and may form moustache-like tufts or groups like overlapping shells, best seen under high magnification. Some species have a strange pocket-like structure on the hind wing with scent scales surrounding it in a palisade. In one group of metallic-coloured species, the males are particularly well equipped for courtship with a variety of sex-specific modifications. This group has been named as a subgenus Casanovula after Giacomo Casanova(1725-1798), the Italian adventurer famous for his many romantic entanglements. The male of the most spectacular species not only has two different kinds of shell-like scent scales on the body, but huge flattened and expanded antennae, whose function is unknown, but which are also presumed to be attractive to females. This species has been named Pectinivalva (Casanovula) minotaurus, after the bull-headed Cretan beast of Greek mythology.


Story Source:

The above story is based on materials provided by Pensoft Publishers. The original story is licensed under a Creative Commons License. Note: Materials may be edited for content and length.


Journal Reference:

  1. Robert Hoare, Erik van Nieukerken. Phylogeny and host-plant relationships of the AustralianMyrtaceae leafmining moth genus Pectinivalva (Lepidoptera, Nepticulidae), withnewsubgenera and species. ZooKeys, 2013; 278 (0): 1 DOI: 10.3897/zookeys.278.4743

Cite This Page:

Pensoft Publishers. "Tiny minotaurs and mini-Casanovas: Ancient pigmy moths reveal secrets of their diversity." ScienceDaily. ScienceDaily, 18 March 2013. <www.sciencedaily.com/releases/2013/03/130318132821.htm>.
Pensoft Publishers. (2013, March 18). Tiny minotaurs and mini-Casanovas: Ancient pigmy moths reveal secrets of their diversity. ScienceDaily. Retrieved April 18, 2014 from www.sciencedaily.com/releases/2013/03/130318132821.htm
Pensoft Publishers. "Tiny minotaurs and mini-Casanovas: Ancient pigmy moths reveal secrets of their diversity." ScienceDaily. www.sciencedaily.com/releases/2013/03/130318132821.htm (accessed April 18, 2014).

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