Milnesium asiaticum, Tumanov, Denis V., 2006

Tumanov, Denis V., 2006, Five new species of the genus Milnesium (Tardigrada, Eutardigrada, Milnesiidae), Zootaxa 1122, pp. 1-23: 12-15

publication ID

http://doi.org/ 10.5281/zenodo.171737

publication LSID

lsid:zoobank.org:pub:920D938D-F578-47BE-B7E7-50DD7864703D

persistent identifier

http://treatment.plazi.org/id/B32287EE-2819-C82F-FEBD-FEFF8ECFD190

treatment provided by

Plazi

scientific name

Milnesium asiaticum
status

sp. nov.

Milnesium asiaticum  sp. nov. ( Figs. 10, 11View FIGURES 10 – 14, 25–29View FIGURES 25 – 29, Table 4)

Type Material. Holotype: sex indeterminate, slide number 194 (14). Collected by A. V. Barabanov (Zoological Institute of the Russian Academy of Sciences, St. Petersburg) 17.06. 1998, Kirghizia.

Paratypes: slide’s numbers 195 (17, 19, 20, 22) from the same locality. Type locality: Kirghizia, Chui Area, northern slope of the Kirghizian ridge, Turakaiyn canyon, vicinity of Turakaiyn village, near 2000 m a.s.l., moss from soil. 5 adults and juvenile specimens and 1 exuvium with 9 eggs were found.

Additional material: slide’s numbers 190 (16, 17, 18). Collected by Dr. I. G. Danylov (Zoological Institute of the Russian Academy of Sciences, St. Petersburg) 16.06. 1998, in Kirghizia, Osh Area, Karakuljin Distr., vicinity of Kylojun village, near 2000 m a.s.l., moss from stone (3 adults).

Etymology. This species is named after the region of its type locality, Asia.

Description. Body length up to 911.1 µm; colour of living specimens slightly reddish or white, cuticle smooth, eyes present in most specimens. Six peribuccal and two lateral papillae present. The mouth has 6 peribuccal lamellae longitudinally striped in their basal portion.

Claws long, slender. Main branch of each claw with two poorly developed accessory points. Complex basal claw+secondary branch with a rounded basal thickening. First three pairs of legs with elongated cuticular thickening near the claw bases. All dimensions are given in Table 4.

Smooth eggs (white in incident light, colourless in preparation) deposited within exuviae.

No mature males were found.

Differential Diagnosis. Milnesium asiaticum  sp. nov. differs from M. reticulatum  by having smooth cuticle without gibbosities, more cephalic position of the insertion point of the stylet supports (pt value 63.9–66.9 in M. asiaticum  sp. nov. and 68.5–69.8 in M. reticulatum  ) and longer claws with developed basal spurs on the outer claws (pt value of the length of main branches of the claws of the IV pair of legs is 63.9 –76.0 in M. asiaticum  sp. nov. and 41.7–44.3 in M. reticulatum  ).

Milnesium asiaticum  sp. nov. differs from M. katarzynae  by having smooth cuticle, more cephalic position of the insertion point of the stylet supports (pt value 63.9–66.9 in M. asiaticum  sp. nov. and 73.3–78.3 in M. katarzynae  ) and longer claws with developed basal spurs on all claws (pt value of the length of main branches of the claws of the IV pair of legs is 63.9 –76.0 in M. asiaticum  sp. nov. and 43.5–43.8 in M. katarzynae  ).

Milnesium asiaticum  sp. nov. differs from M. dujiangensis  by having main claw branches on all legs.

Milnesium asiaticum  sp. nov. differs from M. tardigradum  by having more slender and longer claws, larger pt ratio of the length of the claws of the IV pair of legs and less developed accessory points (for comparison see Tables 1 and 4).

Milnesium asiaticum  sp. nov. differs from M. almatyense  sp. nov. by having longer buccal tube, longer claws (especially on the IV pair of legs) and developed basal spurs on all claws (for comparison see Tables 3 and 4).

Milnesium asiaticum  sp. nov. differs from M. antarcticum  sp. nov. by having smaller buccal tube dimensions, more cephalic position of the insertion point of the stylet supports, more slender claws, larger pt ratio of the length of the claws of the IV pair of legs, less developed accessory points (for comparison see Tables 2 and 4).

Milnesium asiaticum  sp. nov. differs from M. tetralamellatum  by having 6 peribuccal lamellae, larger buccal tube length, slightly more caudal position of the insertion point of the stylet supports (pt value 63.9–66.9 in M. asiaticum  sp. nov. and 63.9 in M. tetralamellatum  ), longer claws with developed basal spurs on the outer claws, lesser pt ratio of the length of the complex basal claw+secondary branch of the IV pair of legs (36.8–46.7 in M. asiaticum  sp. nov. and 46.2 in M. tetralamellatum  ) and larger pt ratio of the length of the main branch of the IV pair of legs (63.9 –76.0 in M. asiaticum  sp. nov. and 54.7 in M. tetralamellatum  ).

Milnesium asiaticum  sp. nov. differs from M. brachyungue  by having larger pt ratio of the length of the claws of the IV pair of legs (pt value of the length of main branches of the claws of the IV pair of legs is 63.9 –76.0 in M. asiaticum  sp. nov. and 33.1 in M. brachyungue  ) and longer claws.

Milnesium asiaticum  sp. nov. differs from M. eurystomum  by having typical configuration of buccal apparatus.

TABLE 4. Summary of morphometric data for Milnesium asiaticum sp. nov. (n = 10).

    Largest specimen