Review Article |
Corresponding author: Derek S. Sikes ( dssikes@alaska.edu ) Academic editor: David Langor
© 2019 Derek S. Sikes.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Sikes DS (2019) Diplura and Protura of Canada. In: Langor DW, Sheffield CS (Eds) The Biota of Canada – A Biodiversity Assessment. Part 1: The Terrestrial Arthropods. ZooKeys 819: 197-203. https://doi.org/10.3897/zookeys.819.25238
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A literature review of the Diplura and Protura of Canada is presented. Canada has six Diplura species documented and an estimated minimum 10–12 remaining to be documented. The Protura fauna is equally poorly known, with nine documented species and a conservatively estimated ten undocumented. Only six and three Barcode Index Numbers are available for Canadian specimens of Diplura and Protura, respectively.
biodiversity assessment, Biota of Canada, Diplura , Protura
Diplura, sometimes referred to as two-pronged bristletails, and Protura, sometimes called coneheads, are terrestrial arthropod taxa that have suffered from lack of scientific attention in Canada as well as globally. As both groups are undersampled and understudied in Canada, the state of knowledge is considered to be poor, although there have been some modest advances since 1979. Both of these taxa are soil dwelling, and, given the repeated glaciations over most of Canada, the Canadian diversity is expected to be relatively low except possibly in unglaciated areas. Nonetheless, the vast majority of the country has been poorly sampled which leaves boundless opportunities for those who develop an interest in these fascinating animals.
There are around 800 species of Diplura known worldwide (
To estimate the size of the complete fauna, I evaluated reports of incompletely identified Canadian dipluran specimens, DNA barcoded Canadian specimens in BOLD, and species known from near the Canadian border, but not yet recorded from Canada. Subsequent to
Two BINs of Canadian diplurans remain unidentified below the family Campodeidae (BOLD:AAN6530, BOLD:ACZ3071). The first of these BINs may correspond to Haplocampa drakei, already known from Canada, because it corresponds to specimens collected from 1074m in Jasper National Park, Alberta, and H. drakei is known from Banff, Alberta, so this is a possible match. The second BIN corresponds to a specimen from Toronto, Ontario and likely represents one of the eight campodeid species that
To summarize the Canadian Diplura fauna, there are six species identified and 10–12 additional species expected to occur based on six BINs of DNA barcoded specimens, incompletely identified Canadian specimens, and species known from near the Canadian border. Thus, the Canadian dipluran fauna could be as high as 18 species, making 40–66% of this fauna undocumented. Although considerable progress has been made relative to the report of
Taxon1 | No. species reported in |
No. species currently known from Canada | No. BINs2 available for Canadian species | Est. no. undescribed or unrecorded species in Canada | General distribution by ecozone3 | Information sources |
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Suborder Rhabdura | ||||||
Campodeidae | 1 | 4 | 6 | 9–11 | Mixedwood Plains, Montane Cordillera, Boreal Plains |
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Suborder Dicellurata | ||||||
Japygidae | 1 | 2 | 0 | 0 | Pacific Maritime, Montane Cordillera |
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Parajapygidae | 0 | 0 | 0 | 1 | Hudson Plains |
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Total | 2 | 6 | 6 | 10–12 |
Despite work by many eminent entomologists since the discovery of Protura in 1907, much remains unknown about these organisms (
Overlooked by
Since Tomlin’s summary (1979b), two additional species were described from Canada by
The Protura fauna of Alaska comprises 15 species (
There are three BINs of Canadian Protura based on specimens collected in Ontario, all identified as family Eosentomidae (BOLD:ACY5591, BOLD:ADA0787, BOLD:ADA0788), and all between 17–20% divergent from their nearest neighbors. These BINs could represent species reported from Canada, but species-level determinations are not yet available.
In summary, the poor state of knowledge about the Canadian (and North American) Diplura and Protura fauna offers many opportunities to explore the diversity, distribution, and biology of these tiny but fascinating creatures. In particular, Berlese, Winkler, and Tullgren funnel extractions of litter and decaying wood will greatly aid the documentation of the Canadian fauna. Those who sample more commonly studied soil and litter creatures, such as mites and Collembola, are well-situated to enhance Canadian collections of other poorly studied litter arthropods by saving by-catch of groups such as Protura and Diplura and forwarding it to those willing to study and identify the material using traditional or molecular methods. Given the difficulty of collecting intact specimens that retain enough appendages to allow morphology-based identification, their small size, and the scarcity of taxonomists interested in diplurans and proturans, it is expected that genetic data will play an increasingly important role in advancing our understanding of the Canadian fauna for these taxa.
Taxon1 | No. species reported in |
No. species currently known from Canada | No. BINs2 available for Canadian species | Est. no. undescribed or unrecorded species in Canada | General distribution by ecozone3 | Information sources |
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Order Acerentomata | ||||||
Acerentomidae | 2 | 6 | 0 | 5 | Taiga Cordillera, Pacific Maritime, Hudson Plains |
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Order Eosentomata | ||||||
Eosentomidae | 1 | 3 | 3 | 5 | Hudson Plains |
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Total | 3 | 9 | 3 | 10 |
Thanks to Owen Lonsdale (Canadian National Collection of Insects, Arachnids, and Nematodes), and Joel Gibson and Erica Wheeler (Royal British Columbia Museum) who loaned me specimens for study. I thank the late Robert “Tommy” Allen (b.1939 – d.2016) who graciously collaborated with me on his final publication and piqued my interest in the Diplura. Thanks also to David Langor who invited me to write this review for the Biota of Canada and helped edit the manuscript.