Diphascon (Diphascon)
publication ID |
https://doi.org/ 10.5281/zenodo.197214 |
DOI |
https://doi.org/10.5281/zenodo.5617910 |
persistent identifier |
https://treatment.plazi.org/id/DD6C480A-FFE1-802E-EBC1-DE0CFCD7F876 |
treatment provided by |
Plazi (2016-04-10 04:20:34, last updated 2024-11-27 11:26:12) |
scientific name |
Diphascon (Diphascon) |
status |
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Diphascon (Diphascon) View in CoL sp.
Material examined: One specimen (slide CII93), deposited in the collection of P. Fontoura at the Department of Biology, Faculty of Sciences, University of Porto, Portugal.
Description: The examined specimen clearly belongs to the ‘ pingue group’ characterised by having smooth cuticle; pharyngeal bulb with apophyses, three macroplacoids, microplacoid and septulum; lunules and other cuticular thickenings on the legs absent; claw bases without indentations. According to several authors (e.g. Pilato & Binda, 1997 /98; 1998; 1999; Fontoura & Pilato, 2007) the species belonging to this group are very difficult to separate from one another, differing in some quantitative characters and in only a few cases in qualitative characters.
The only specimen collected in São Tomé, 173 µm long, is not perfectly oriented to measure all the structures necessary to ensure a correct specific diagnosis. As a consequence the measurements indicated here have to be considered approximate. Buccal tube 13.8 µm long and 1.6 µm wide externally (ptd = 11.6), its length is about 35.3 % of the total length of the bucco-pharyngeal tube; stylet supports inserted on the buccal tube at about 71.0 % of its length; pharyngeal bulb with apophyses, three rod-shaped macroplacoids, microplacoid and septulum; entire row of placoids (microplacoid and septulum included) 10.0 µm long (ptd = 72.5); line of the macroplacoids 8.2 µm long (ptd = 59.4); first, second and third macroplacoid 2.7 µm long (ptd = 19.2), 2.4 µm long (ptd = 17.7) and 3.6 µm long (ptd = 25.7) respectively; microplacoid 0.7 µm long (ptd = 5.1); septulum 1.4 µm long (ptd = 10.1).
The claws, of ‘ Hypsibius type’, are well developed and with accessory points on the main branches; external and internal claws of the second and third pairs of legs 7.3 µm long (ptd = 52.9) and 5.2 µm long (ptd = 37.7) respectively; anterior and posterior claws of the hind legs 5.5 µm long (ptd = 39.9) and 7.8 µm long (ptd = 56.5) respectively.
For some characters the specimen collected in São Tomé is similar to Diphascon (D.) claxtonae Pilato & Binda, 1998 and Diphascon (D.) faialense Fontoura & Pilato, 2007 but some metric characters are clearly different (the buccal tube is wider; the stylet supports are inserted in a more posterior position and the ptd values of the claws length are higher). Due to the poor orientation of the specimen, we prefer not to attribute it to any known species of the ‘ pingue group’, nor do we think it opportune to describe a new species.
Paramacrobiotus gerlachae ( Pilato, Binda & Lisi, 2004) View in CoL + Paramacrobiotus richtersi ( Murray, 1911) View in CoL + + + Isohypsibius schaudinni ( Richters, 1909) View in CoL + Isohypsibius tetradactyloides ( Richters, 1907) View in CoL + Diphascon (Adropion) scoticum Murray, 1905 View in CoL +
Diphascon (Adropion) scoticum View in CoL ssp ommatophorum +
( Thulin, 1911)
Diphascon (Diphascon) View in CoL sp. + Fractonotus caelatus ( Marcus, 1928) View in CoL +
Fontoura, P. & Pilato, G. (2007) Diphascon (Diphascon) faialense sp. nov. a new species of Tardigrada (Eutardigrada, Hypsibiidae) from the Azores and a key to the species of the D. pingue group. Zootaxa, 1589, 47 - 55.
Marcus, E. (1928) Barthierchen (Tardigrada). In: Dahl F., Die Tierwelt Deutschlands und der angrenzenden Meeresteile, Jena, 12 (IV), 1 - 230.
Murray, J. (1905) The Tardigrada of the Scottish lochs. Transactions of the Royal Society of Edinburgh, Part III, 41, 677 - 698.
Murray, J. (1911) Arctiscoidea. Proceedings of the Royal Irish Academy, Dublin and London, 31 (37), 1 - 16.
Pilato, G. & Binda, M. G. (1997 / 98) A comparison of Diphascon (D.) alpinum Murray, 1906, D. (D.) chilenense Plate, 1989 and D. (D.) pingue Marcus, 1936 (Tardigrada), and description of a new species. Zoologischer Anzeiger, 236, 181 - 185.
Pilato, G. & Binda, M. G. (1998) Two new species of Diphascon (Eutardigrada) from New South Wales, Australia. New Zealand Journal of Zoology, 25, 171 - 174.
Pilato G., Binda, M. G. & Lisi, O. (2004) Notes on tardigrades of the Seychelles with description of three new species. Italian Journal of Zoology, 71, 171 - 178.
Richters, F. (1907) Die Fauna der Moosrasen des Gaussberg und einiger Sudlicher Inseln. Deutsch Sudpolar Expedition, Zoologie, 9 (4), 259 - 302.
Richters, F. (1909) Tardigraden-studien. Bericht uber die Senckenberische Naturforschende Gesselschaft in Frankfurt am Main, 2, 28 - 48.
Thulin, G. (1911) Beitrag zur Kenntnis der Tardigradenfauna Schwedens. Arkiv for Zoologi Stockholm, 7, 1 - 60.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
Kingdom |
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Phylum |
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Class |
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Order |
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Family |
Diphascon (Diphascon)
Fontoura, Paulo, Pilato, Giovanni & Lisi, Oscar 2010 |
Paramacrobiotus gerlachae (
Pilato, Binda & Lisi 2004 |
Hypsibius maculatus
Iharos 1969 |
Doryphoribius flavus
Iharos 1966 |
Isohypsibius prosostomus
Thulin 1928 |
Fractonotus caelatus (
Marcus 1928 |
Hypsibius convergens
Urbanowicz 1925 |
Paramacrobiotus richtersi (
Murray 1911 |
Isohypsibius schaudinni (
Richters 1909 |
Isohypsibius tetradactyloides (
Richters 1907 |
Murrayon pullari
Murray 1907 |
Diphascon (Adropion) scoticum
Murray 1905 |
Minibiotus intermedius
Plate 1889 |
Hypsibius dujardini (Doyère, 1840)
Doyere 1840 |
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