An extreme case of epitoky in an australian collembolon : Isotopenola perterrens sp.n. (Hexapoda : Collembola : Isotomidae)
- Authors: Greenslade, Penelope , Potapov, Mikhail
- Date: 2012
- Type: Text , Journal article
- Relation: Arthropod Systematics and Phylogeny Vol. 70, no. 2 (2012), p. 85-94
- Full Text:
- Reviewed:
- Description: Isotopenola perterrens sp.n. is described from a 40 year old Eucalyptus plantation in Victoria, Australia, and its occurrence in an adjacent site of remnant native vegetation is reported. Fully adult males are armed with numerous strong spine-like macrochaetae on lateral parts of head and body tergites and with fields of long bristles on latero-ventral and ventral areas of abdomen. Antennae of epitokous males are of normal shape but bear thickened chaetae. This is the second and most extreme case of epitoky recorded in the genus. The occurrence of sexual dimorphism, of which epitoky is a subset, is summarised for Australian Collembola. Environmental factors that appear to facilitate successful recolonisation of native fauna onto revegetated sites in Australia are proposed. © Senckenberg Gesellschaft für Naturforschung.
Biology, affinity and description of an unusual aquatic new genus and species of isotomidae (collembola) from high altitude lakes in Tasmania
- Authors: Greenslade, Penelope , Potapov, Mikhail
- Date: 2015
- Type: Text , Journal article
- Relation: European Journal of Entomology Vol. 112, no. 2 (2015), p. 334-343
- Full Text: false
- Reviewed:
- Description: A new species of Isotomidae (Collembola) was collected from submerged stones on the edge of nine lakes on Tasmania's Central Highland Plateau. Because it did not comply fully with the characters of any existing genus, a new genus, Chionobora gen. n. is erected for it here. An Antarctic species, Desoria klovstadi (Carpenter), has characters which conform with the new genus so is formally transferred to the new genus here. The Antarctic Continent and Tasmania were last in proximity 60 million years b.p. so it is suggested both species are relicts persisting in probable ice-free refugia during glacial cycles. Gut contents of specimens of the new species exclusively contained diatoms in various stages of digestion and the species appears to graze on aquatic macrophytes, a feeding habit not recorded before for Collembola. We note the high numbers of endemic invertebrate taxa of restricted distributions in cold habitats of southern regions compared to warmer regions and stress their conservation values and threats to their populations.
Global Collembola on Deception Island
- Authors: Greenslade, Penelope , Potapov, Mikhail , Russell, David , Convey, Peter
- Date: 2012
- Type: Text , Journal article
- Relation: Journal of Insect Science Vol. 12, no. 111 (2012), p. 1-16
- Full Text:
- Reviewed:
- Description: Three new non-indigenous springtail species are recorded in recent collections made on Deception Island, South Shetland Islands, maritime Antarctic: Deuteraphorura (Deuteraphorura) cebennaria (Gisin) (Collembola: Onychiuridae), Mesaphorura macrochaeta Rusek (Tullbergiidae), and Proisotoma minuta Axelson (Isotomidae). One of these, D. (D.) cebennaria, is described. Additionally, two new indigenous species, Mesaphorura macrochaeta Rusek and Proisotoma minuta Axelson, are also recorded. The total number of Collembola species now known from the island is 14, comprised of eight native species and six non-indigenous species. This number of non-indigenous species recorded at Deception Island compares with only a single non-indigenous springtail recorded at any other maritime or continental Antarctic location. The reason underlying this high level of occurrence of non-indigenous species on Deception Island is likely to be a combination of the island's high level of human visitation and the presence of relatively benign terrestrial habitats associated with areas of geothermal activity. Two of the new records represent species recently assessed as being of the highest risk to become invaders in the less extreme environments of the subantarctic, thereby emphasising the importance and urgency of adopting and applying effective biosecurity measures to protect the unique and vulnerable ecosystems of this region. Also documented are the impacts on the soil fauna of the island from human trampling, which drastically reduced densities of both native and non-indigenous species to 1% of the abundance typical of non-trampled sites.
- Description: 2003010796
Redescription of Folsomia loftyensis Womersley with notes on the sensillary arrangement of the genital segment in the genus (Collembola : Isotomidae)
- Authors: Potapov, Mikhail , Greenslade, Penelope
- Date: 2010
- Type: Text , Journal article
- Relation: Zoologischer Anzeiger Vol. 249, no. 1 (2010), p. 13-20
- Full Text:
- Reviewed:
- Description: Folsomia loftyensis Womersley is redescribed based on material from South Australia, Victoria and Queensland. The species exhibits, for the genus, an unusual sensillary pattern on the posterior abdominal segments. The arrangement and form of the five sensilla on the genital segment of most described species of Folsomia from the Palearctic are analysed and species divided into groups based on these characters. Several different lineages are detected. © 2010 Elsevier GmbH. All rights reserved.
Taxonomy of the Proisotoma complex. II. A revision of the genus Subisotoma and a description of Isotopenola gen. nov (Collembola: Isotomidae)
- Authors: Potapov, Mikhail , Babenko, Anatoly , Fjellberg, Arne , Greenslade, Penelope
- Date: 2009
- Type: Text , Journal article
- Relation: Zootaxa Vol. , no. 2314 (2009), p. 1-40
- Full Text: false
- Reviewed:
- Description: A taxonomic revision of the genus Subisotoma Stach, 1947 is presented. Subisotoma pusilla (Schaffer, 1900), S. tenuis (Dunger, 1982), and S. asiatica (Martynova, 1970) are re-described based on type and fresh material. Eight new species of the genus are described; S. pomorskii sp. nov., S. homonomica sp. nov., S. bisensillata sp. nov., S. guzeriplica sp. nov., S. posteriomollis sp. nov., S. multisensillata sp. nov., S. cruda sp. nov., and S. erratica sp. nov., using material from Eurasia. A key to the known species of Subisotoma is given. A new genus, Isotopenola gen. nov., is erected for some southern representatives of the 'Cryptopygus' complex related to Subisotoma: I. australis (Womersley, 1934) comb. nov., I. loftyensis (Womersley, 1934) comb. nov., I. nilgiris (Denis, 1947) comb. nov. They are re-described based on type and fresh material. A new species I. delicata sp. nov. is described from Australia. A key to the known species of Isotopenola is given.