Milnesium granulatum Ramazzotti, 1962,

Bartels, Paul J., Nelson, Diane R., Kaczmarek, Łukasz & Michalczyk, Łukasz, 2014, The genus Milnesium (Tardigrada: Eutardigrada: Milnesiidae) in the Great Smoky Mountains National Park (North Carolina and Tennessee, USA), with the description of Milnesium bohleberi sp. nov., Zootaxa 3826 (2), pp. 356-368: 363-366

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Milnesium granulatum Ramazzotti, 1962


Milnesium granulatum Ramazzotti, 1962 

( Figs 7–11View FIGURES 7 – 8View FIGURES 9 – 11, Table 2)

Material examined. Seven adult specimens: 35 ° 39.2836 'N, 83 ° 26.1889 'W, 1,978 m asl (Mt. LeConte, 06.11.2001); one adult specimens: 35 ° 36.6820 'N, 83 ° 32.5381 'W, 917 m asl (Goshen Prong, 10.06.2002); and one adult specimens: 35 ° 41.1328 'N, 83 ° 29.8911 'W, 594 m asl (Twin Creeks, 28.08.2002). All sites in the Great Smoky Mountains National Park, Tennessee, U.S.A., moss samples and lichen samples from trees; coll. P.J. Bartels.

Remarks. Milnesium granulatum  was originally described from Chile by Ramazzotti (1962) as a variety of Milnesium tardigradum Doyère, 1840  but it was later elevated to the species level and placed in the granulatum  group of species with sculptured cuticles by Michalczyk et al. (2012 a,b). Our specimens correspond perfectly to the original description and the recent re-description (Michalczyk et al. 2012 a,b). This is a new record for the USA and to North America (Meyer 2013). In the GSMNP tardigrade database, M. granulatum  is extremely rare, occurring in only three of 19 sites, and making up only 0.06 % of terrestrial tardigrades.

TABLE 2. Measurements (in µm), pt values, and size normalised values (a * = intercept of log Y * vs. BTL) of selected morphological structures of six specimens of Milnesium granulatum mounted in Hoyer’s medium. Note that sample size for specific traits varied since not all traits were measureable on all individuals.? = trait oriented unsuitably for measurement.


Great Smoky Mountains National Park