Diphascon

Fontoura, Paulo, Pilato, Giovanni & Lisi, Oscar, 2010, First record of Tardigrada from São Tomé (Gulf of Guinea, Western Equatorial Africa) and description of Pseudechiniscus santomensis sp. nov. (Heterotardigrada: Echiniscidae), Zootaxa 2564, pp. 31-42: 38-39

publication ID

http://doi.org/ 10.5281/zenodo.197214

DOI

http://doi.org/10.5281/zenodo.5617910

persistent identifier

http://treatment.plazi.org/id/DD6C480A-FFE1-802E-EBC1-DE0CFCD7F876

treatment provided by

Plazi

scientific name

Diphascon
status

 

Diphascon   ( Diphascon   ) sp.

Material examined: One specimen (slide CII 93), 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)   + Paramacrobiotus richtersi ( Murray, 1911)   + + + Isohypsibius schaudinni ( Richters, 1909)   + Isohypsibius tetradactyloides ( Richters, 1907)   + Diphascon (Adropion) scoticum Murray, 1905   +

Diphascon (Adropion) scoticum   ssp ommatophorum +

( Thulin, 1911)

Diphascon   ( Diphascon   ) sp. + Fractonotus caelatus ( Marcus, 1928)   +

Kingdom

Animalia

Phylum

Tardigrada

Class

Eutardigrada

Order

Parachela

Family

Hypsibiidae

Loc

Diphascon

Fontoura, Paulo, Pilato, Giovanni & Lisi, Oscar 2010
2010
Loc

Paramacrobiotus gerlachae (

Pilato, Binda & Lisi 2004
2004
Loc

Hypsibius maculatus

Iharos 1969
1969
Loc

maculatus

Iharos 1969
1969
Loc

Doryphoribius flavus

Iharos 1966
1966
Loc

Isohypsibius prosostomus

Thulin 1928
1928
Loc

prosostomus

Thulin 1928
1928
Loc

Fractonotus caelatus (

Marcus 1928
1928
Loc

Hypsibius convergens

Urbanowicz 1925
1925
Loc

convergens

Urbanowicz 1925
1925
Loc

Paramacrobiotus richtersi (

Murray 1911
1911
Loc

Isohypsibius schaudinni (

Richters 1909
1909
Loc

Isohypsibius tetradactyloides (

Richters 1907
1907
Loc

Murrayon pullari

Murray 1907
1907
Loc

Diphascon (Adropion) scoticum

Murray 1905
1905
Loc

Minibiotus intermedius

Plate 1889
1889
Loc

Hypsibius dujardini (Doyère, 1840)

Doyere 1840
1840
Loc

dujardini

Doyere 1840
1840