Skip to main content Skip to main navigation menu Skip to site footer
Responsive image
Issue: Vol. 4403 No. 1: 3 Apr. 2018
Type: Article
Published: 2018-04-03
DOI: 10.11646/zootaxa.4403.1.2
Page range: 50–60
Abstract views: 53
PDF downloaded: 1

Two new Chinese species of Tomocerus at different stages of troglomorphic adaptation (Collembola, Tomoceridae)

Soil Ecology Lab, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, P. R. China. Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210014, Jiangsu Province, P. R. China.
Institut de Systématique, Evolution, Biodiversité, ISYEB—UMR 7205—CNRS, MNHN, UPMC, EPHE, Muséum national d’Histoire naturelle, Sorbonne Universités, 57 rue Cuvier, CP 50, Paris 75005, France.
Collembola Tomocerus troglodytes Tomocerus leyensis troglomorphy caves

Abstract

Two new species of Tomocerus are described from caves in Guizhou and Guangxi Province, China. Tomocerus troglodytes sp. nov. is highly troglomorphic. It belongs to the kinoshitai complex, and is most similar to another eyeless and colourless species Tomocerus caecus, from which it differs as it has longer antennae; 2,2/2,2/2+2/0 versus 2,2/2,5/0/0 cephalic dorsal chaetotaxy formula; 6 versus 4 central macrochaetae on Th. II; 0 versus 2 ungual teeth; unguis devoid of baso-internal ridges; 3–5/3–5, I, 0–1, I versus 4–5/1–2,I–II,0–1,I–II dental spines formula; 2–4 versus 1 tenacular chaetae; and 0 versus 1 mucronal intermediate teeth. In contrast, Tomocerus leyensis sp. nov. is at an earlier stage of troglomorphic adaptation. It resembles several cave-dwelling species of the ocreatus complex in habitus and shape of dental spines, but differs in the following characters: absence of large postantennal organ; cephalic dorsal chaetotaxy formula 2/2,4/2+2/2+2 versus other patterns; larger number of ungual teeth; and only 1 large distal dental spine. The troglomorphic characteristics of the two species are discussed with emphasis on their potential adaptation to cave habitats.

 

 

References

  1. Blottner, D. & Eisenbeis, G. (1984) Ultrastructure of long tibiotarsal spatula-hairs in Tomocerus flavescens (Collembola: Tomoceridae). Annales Société Royale Zoologique de Belgique, 114, 51–57.

    Christiansen, K. (1964) A revision of the Nearctic members of the genus Tomocerus (Collembola Entomobryidae). Revue d'Écologie et de Biologie du Sol, 1, 668–675.

    Christiansen, K. (1965) Behavior and form in the evolution of cave Collembola. Evolution, 19, 529–537.
    https://doi.org/10.1111/j.1558-5646.1965.tb03328.x

    Fjellberg, A. (2007) The Collembola of Fennoscandia and Denmark. Part II: Entomobryomorpha and Symphypleona. Fauna Entomologica Scandinavica, 42, 1–264.
    https://doi.org/10.1163/ej.9789004157705.i-265

    Frauenfeld, G.R. (1854) Uber Tritomurus scutellatus, Poduride aus den Krainer Grotten. Verhandlungen der Zoologisch Botanischen Gesellschaft in Wien, 4, 15–17.

    Lubbock, J. (1873) Monograph of the Collembola and Thysanura. Ray Society, London, 265 pp.

    Nicolet, H. (1842) Recherches pour servir à l'histoire des Podurelles. Nouveaux Mémoires de la Société Helvétique des Sciences Naturelles, 6, 1–88.

    Yu, D.Y., Zhang, F. & Deharveng, L. (2014) A peculiar cave species of Tomocerus (Collembola, Tomoceridae, Tomocerinae) from Vietnam, with a discussion of the postantennal organ and prelabral chaetae in Tomocerinae. Zookeys, 408, 61–70.
    https://doi.org/10.3897/zookeys.408.7030

    Yu, D.Y., Deharveng, L. & Zhang, F. (2014) New species of Monodontocerus (Collembola: Tomoceridae) from southern China with diagnostic notes on the genus and introduction of new taxonomic characters. Zootaxa, 3768 (5), 557–575.
    https://doi.org/10.11646/zootaxa.3768.5.3

    Yu, D.Y., Deharveng, L. (2015) The first eyeless species of Tomocerus from China (Collembola, Tomoceridae) with notes on genera Tomocerus and Pogonognathellus. Zootaxa, 3914 (2), 175–184.
    https://doi.org/10.11646/zootaxa.3914.2.7

    Yu, D.Y., Yan, Q.B. & Liu, M.Q. (2016) New cave-dwelling species of Tomoceridae from China, with a study on the pattern of mesothoracic bothriotricha in Tomocerinae (Collembola, Entomobryomorpha). ZooKeys, 574, 81–95.
    https://doi.org/10.3897/zookeys.574.7312

    Yu, D.Y. & Li, Y.B. (2016) New troglomorphic species of Tomocerus with well-developed postantennal organs (Collembola: Tomoceridae). Zootaxa, 4162 (2), 361–372.
    https://doi.org/10.11646/zootaxa.4162.2.10

    Yu, D.Y., Ding, Y.H. & Ma, Y.T. (2017) Revision of Tomocerus similis Chen & Ma, with discussion of the kinoshitai complex and the distal tibiotarsal chaetae in Tomocerinae (Collembola, Tomoceridae). Zootaxa, 4268 (3), 395–410.
    https://doi.org/10.11646/zootaxa.4268.3.5