Species diversity in Friesea (Neanuridae) reveals similar biogeographic patterns among Antarctic Collembola
- Authors: Stevens, Mark , Greenslade, Penelope , D’Haese, Cyrille
- Date: 2021
- Type: Text , Journal article
- Relation: Zoologica Scripta Vol. 50, no. 5 (2021), p. 647-657
- Full Text: false
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- Description: The pan-Antarctic distributions of several collembolan species have been supported by morphology for over 120 years. However, for most species where molecular data are available, these are now known to belong instead to several species, and most classified as short-range endemics. One such species, Friesea grisea, had a pan-Antarctic distribution that has been in question, but until recently, specimens of F. grisea from the type locality on South Georgia have not been included in any molecular appraisal. Here, we compare the molecular identity of specimens of F. grisea, from South Georgia, with other Antarctic and sub-Antarctic species using the mitochondrial COI gene. A Bayesian phylogenetic analysis for 14 species of Friesea from southern regions, including F. grisea sensu stricto with species previously identified as ‘F. grisea’ (F. antarctica, F. gretae and F. propria) confirms the distinctness of the South Georgian specimens based on molecular data, and these results are confirmed morphologically. The genus Friesea is one of the most speciose genera of Collembola known in the Antarctic region, and we provide an annotated key (dichotomous and interactive versions) to all Friesea species in the sub-Antarctic and Antarctica. We compare the biogeography of Friesea to other Collembola from the region to highlight our current understanding of species boundaries and island linkages. © 2021 Royal Swedish Academy of Sciences.
A revision of the genus Lepidobrya Womersley (Collembola: Entomobryidae) based on morphology and sequence data of the genotype
- Authors: Zhang, Feng , Greenslade, Penelope , Stevens, Mark
- Date: 2017
- Type: Text , Journal article
- Relation: Zootaxa Vol. 4221, no. 5 (2017), p. 523-536
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- Description: The genus Lepidobrya Womersley, previously placed in Willowsiini, is re-diagnosed based on a redescription of the type species L. mawsoni (Tillyard) and its DNA barcode. Specimens possess narrow, pointed scales on the dens, two inner teeth on unguis, a truncate unguiculus with an outer tooth, a bidentate mucro with a basal spine and ordinary tergal S-chaetae 2, 2 vertical bar 1, 2, 2, ?, 3, so belongs to the Entomobryinae. Its systematic position and relationships to other scaled Entomobryinae genera are discussed and comments are made on the distribution of the genus as well as on ecology.
Challenging species delimitation in Collembola: cryptic diversity among common springtails unveiled by DNA barcoding
- Authors: Porco, David , Bedòs, Anne , Greenslade, Penelope , Janion, Charlene , Skarzynski, Dariusz , Stevens, Mark , van Vuuren, Bettine , Deharveng, Louis
- Date: 2012
- Type: Text , Journal article
- Relation: Invertebrate Systematics Vol. 26, no. 6 (2012), p. 470-477
- Full Text: false
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- Description: Collembola is one of the major functional groups in soil as well as a model taxon in numerous disciplines. Therefore the accurate identification of specimens is critical, but could be jeopardised by cases of cryptic diversity. Several populations of six well characterised species of springtails were sequenced using the COI barcode fragment as a contribution to the global Collembola barcoding campaign. Each species showed high intraspecific divergence, comparable to interspecific sequence divergence values observed in previous studies and in 10 congeneric species barcoded here as a reference. The nuclear marker, 28S, confirmed all the intraspecific lineages found with COI, supporting the potential specific status of these entities. The implications of this finding for taxonomy and for disciplines relying on species names, such as evolution and ecology, are discussed.
- Description: C1
Challenging species delimitation in Collembola: Cryptic diversity among common springtails unveiled by DNA barcoding
- Authors: Porco, David , Bedòs, Anne , Greenslade, Penelope , Janion, Charlene , Skar , Stevens, Mark , Jansen van Vuuren, Bettine , Deharveng, Louis
- Date: 2012
- Type: Text , Journal article
- Relation: Invertebrate Systematics Vol. 26, no. 6 (2012), p. 470-477
- Full Text: false
- Reviewed:
- Description: Collembola is one of the major functional groups in soil as well as a model taxon in numerous disciplines. Therefore the accurate identification of specimens is critical, but could be jeopardised by cases of cryptic diversity. Several populations of six well characterised species of springtails were sequenced using the COI barcode fragment as a contribution to the global Collembola barcoding campaign. Each species showed high intraspecific divergence, comparable to interspecific sequence divergence values observed in previous studies and in 10 congeneric species barcoded here as a reference. The nuclear marker, 28S, confirmed all the intraspecific lineages found with COI, supporting the potential specific status of these entities. The implications of this finding for taxonomy and for disciplines relying on species names, such as evolution and ecology, are discussed.
An ancient Antarctic endemic genus restored: morphological and molecular support for Gomphiocephalus hodgsoni (Collembola: Hypogastruridae)
- Authors: Greenslade, Penelope , Stevens, Mark , Torricelli, Giulia , D'Haese, Cyrille
- Date: 2011
- Type: Text , Journal article
- Relation: Systematic entomology Vol. 36, no. 2 (2011), p. 223-240
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- Description: Gomphiocephalus hodgsoni Carpenter was only the second collembolon dagger to be described from the Antarctic continent. It was collected first in 1902 from Granite Harbour, southern Victoria Land, Eastern Antarctica, by the British National Antarctic Expedition (1901-1904). Since then several studies have investigated the distribution, ecology, ecophysiology and molecular composition of the species. Despite two morphological redescriptions and an absence of detailed evolutionary phylogenetic studies, the genus Gomphiocephalus was recently reduced to a subgenus of Schoettella Schaffer. Here, we redescribe the species in detail and use morphological and molecular (cytochrome c oxidase subunit I and 28S) data to indicate its generic relationships within Hypogastruridae. Characters of Gomphiocephalus do not conform with those of any extant genus in the family, including Schoettella. In addition, the only Schoettella species described from the southern hemisphere, Schoettella subcorta Salmon, is shown here to belong in the genus Xenylla. Furthermore, molecular data indicates the genus has no close relationship to any other in Poduromorpha, and in particular Hypogastruridae. Therefore, we restore Gomphiocephalus to generic status. Our results reinforce the already recognized high level of endemism in the Antarctic fauna at both species and generic levels, and emphasise the necessity of using both morphological and molecular data in determining the systematics and evolutionary relationships of the fauna.