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Table 1 Measurements and pt values of selected morphological structures of Milnesium argentinum sp. nov. mounted in Hoyer's medium

From: The genus Milnesium Doyère, 1840 (Tardigrada) in South America with descriptions of two new species from Argentina and discussion of the feeding behaviour in the family Milnesiidae

Character N Range Mean SD Holotype
μm pt μm pt μm pt μm pt
Body length 12 445 - 890 921 - 1,290 707 1,093 141 123 890 1,211
Peribuccal papillae length 10 6.7 - 12.4 14.1 - 18.6 10.3 16.3 1.7 1.1 11.6 15.8
Lateral papillae length 9 5.5 - 11.4 9.4 - 17.6 9.0 14.1 1.9 2.3 ? ?
Buccal tube              
Length 12 47.6 - 74.2   -   64.3 - 8.6 - 73.5 -
Stylet support insertion point 12 35.1 - 52.3 70.0 - 73.7 46.0 71.7 5.8 1.4 52.3 71.2
Anterior width 12 16.0 - 29.5 30.3 - 39.8 22.3 34.5 4.3 3.4 29.1 39.6
Standard width 12 13.0 - 24.0 24.2 - 32.3 17.7 27.4 3.5 2.8 22.0 29.9
Posterior width 12 12.2 - 24.5 23.1 - 33.6 17.8 27.6 3.9 3.4 24.5 33.3
Standard width/length ratio 12 24% - 32%   -   27% - 3% - 30% -
Posterior/anterior width ratio 12 76% - 87%   -   80% - 4% - 84% -
Claw 1 lengths              
External primary branch 10 12.4 - 20.5 24.3 - 28.6 16.7 26.3 2.6 1.5 20.5 27.9
External base + secondary branch 9 10.5 - 17.8 22.0 - 25.2 14.4 23.0 2.4 1.2 17.8 24.2
External spur 8 3.7 - 5.8 7.1 - 8.2 4.8 7.7 0.8 0.4 ? ?
Internal primary branch 11 12.9 - 18.7 21.1 - 28.9 15.8 24.8 2..1 2.0 17.4 23.7
Internal base + secondary branch 10 11.1 - 18.2 21.1 - 26.1 14.8 23.2 2.5 1.5 17.3 23.5
Internal spur 10 3.4 - 5.7 7.1 - 8.8 5.0 7.8 0.9 0.6 5.6 7.6
Claw 2 lengths              
External primary branch 10 14.3 - 20.5 24.7 - 28.5 17.8 26.6 2.0 1.3 20.5 27.9
External base + secondary branch 12 11.3 - 17.9 22.1 - 26.3 15.2 23.7 2.0 1.3 17.9 24.4
External spur 6 2.8 - 5.5 5.9 - 8.5 4.0 6.7 1.0 1.0 ? ?
Internal primary branch 10 12.6 - 20.8 23.1 - 30.5 17.2 26.4 2.8 2.5 20.8 28.3
Internal base + secondary branch 11 11.6 - 16.5 21.2 - 25.2 14.8 22.5 1.6 1.2 16.1 21.9
Internal spur 9 3.8 - 6.3 6.6 - 8.8 5.3 7.9 0.9 0.8 6.3 8.6
Claw 3 lengths              
External primary branch 11 12.8 - 22.3 23.4 - 30.3 17.7 27.3 3.2 2.1 22.3 30.3
External base + secondary branch 10 11.9 - 17.1 22.5 - 25.1 14.9 23.3 2.1 0.9 17.1 23.3
External spur 7 3.3 - 5.3 5.9 - 7.6 4.5 6.9 0.8 0.6 ? ?
Internal primary branch 11 13.9 - 21.4 24.4 - 28.8 17.5 27.0 2.6 1.5 20.7 28.2
Internal base + secondary branch 10 12.7 - 17.8 20.3 - 25.7 15.2 23.1 1.9 1.4 17.2 23.4
Internal spur 8 4.2 - 6.9 6.8 - 9.9 5.7 8.5 1.0 1.1 6.2 8.4
Claw 4 lengths              
Anterior primary branch 10 14.7 - 24.3 29.9 - 33.8 20.5 31.8 3.6 1.3 24.2 32.9
Anterior base + secondary branch 11 12.2 - 20.3 24.4 - 28.8 16.8 26.0 2.7 1.4 20.3 27.6
Anterior spur 11 3.8 - 7.9 8.0 - 10.8 6.3 9.7 1.2 0.8 7.3 9.9
Posterior primary branch 11 13.5 - 25.8 28.4 - 36.4 21.3 33.0 4.0 2.7 25.4 34.6
Posterior base + secondary branch 11 12.8 - 20.2 25.0 - 28.3 17.3 26.8 2.7 1.0 20.2 27.5
Posterior spur 8 3.3 - 6.2 6.9 - 8.4 4.9 7.8 1.0 0.6 6.2 8.4
  1. Range refers to the smallest and the largest structure among all measured specimens.
  2. The pt values are provided in italics.
  3. N, number of specimens/structures measured; SD, standard deviation; ?, no data.