Milnesium granulatum Ramazzotti, 1962
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publication ID |
https://doi.org/10.11646/zootaxa.3826.2.5 |
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publication LSID |
lsid:zoobank.org:pub:9607032B-DF05-419C-B910-558CA0709FAA |
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DOI |
https://doi.org/10.5281/zenodo.5625349 |
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persistent identifier |
https://treatment.plazi.org/id/03AE87A5-C62A-7159-FF7E-FF3D1F65FEF2 |
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treatment provided by |
Plazi |
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scientific name |
Milnesium granulatum Ramazzotti, 1962 |
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Milnesium granulatum Ramazzotti, 1962
( Figs 7–11 View FIGURES 7 – 8 View FIGURES 9 – 11 , Table 2 View 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. (2012a,b). Our specimens correspond perfectly to the original description and the recent re-description (Michalczyk et al. 2012a,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.
| CHARACTER | N | RANGE (µm) | RANGE (pt) | MEAN | SD | a* |
|---|---|---|---|---|---|---|
| min – max | min – max | µm pt | µm pt | µm | ||
| Body length | 6 | 244 – 535 | 875 – 1277 | 338 1056 | 109 152 | 327 |
| Peribuccal papillae length | 0 | ? –? | ? –? | ? ? | ? ? | ? |
| Lateral papillae length | 0 | ? –? | ? –? | ? ? | ? ? | ? |
| Buccal tube | ||||||
| Length | 6 | 19.1 – 49.5 | – | 32.5 – | 10.9 – | – |
| Stylet support insertion point | 5 | 13.6 – 32.6 | 63.8 – 71.4 | 22.3 67.4 | 7.3 3.7 | 21.8 |
| Anterior width | 6 | 9.6 – 27.0 | 50.3 – 57.4 | 17.5 53.8 | 6.0 2.4 | 17.7 |
| Standard width | 6 | 9.7 – 24.5 | 45.6 – 50.9 | 15.7 48.4 | 5.3 2.3 | 15.5 |
| Posterior width | 6 | 9.8 – 23.3 | 46.5 – 54.2 | 15.9 49.5 | 4.8 3.1 | 16.1 |
| Standard width/length ratio | 6 | 46% – 51% | – | 50% – | 2% – | 48% |
| Posterior/anterior width ratio | 6 | 86% – 102% | – | 90% – | 6% – | 91% |
| Claw 1 lengths | ||||||
| External primary branch | 4 | 10.3 – 12.0 | 25.0 – 58.3 | 11.3 41.7 | 0.8 13.6 | 11.5 |
| External base + secondary branch | 6 | 7.7 – 9.6 | 19.3 – 42.0 | 8.2 27.4 | 0.7 8.4 | 8.1 |
| External spur | 5 | 3.1 – 5.1 | 9.5 – 16.3 | 3.8 12.1 | 0.8 2.7 | 2.4 |
| Internal primary branch | 2 | 12.3 – 12.8 | 43.9 – 44.1 | 12.5 44.0 | 0.4 0.2 | ? |
| Internal base + secondary branch | 5 | 7.4 – 11.2 | 19.9 – 28.6 | 8.6 25.1 | 1.5 3.8 | 5.2 |
| Internal spur | 3 | 3.0 – 5.7 | 10.6 – 13.5 | 4.2 11.8 | 1.4 1.5 | 1.0 |
| Claw 2 lengths | ||||||
| External primary branch | 4 | 10.8 – 14.6 | 29.5 – 56.8 | 12.0 41.4 | 1.8 11.5 | 9.8 |
| External base + secondary branch | 3 | 7.4 – 12.0 | 24.2 – 43.3 | 9.2 31.4 | 2.4 10.3 | 6.2 |
| External spur | 3 | 3.6 – 3.8 | 12.6 – 19.0 | 3.7 15.1 | 0.1 3.5 | 4.2 |
| Internal primary branch | 5 | 10.9 – 14.3 | 28.9 – 58.0 | 12.0 41.9 | 1.4 10.7 | 10.5 |
| Internal base + secondary branch | 4 | 7.2 – 10.7 | 21.6 – 40.6 | 8.6 29.4 | 1.5 8.1 | 6.5 |
| Internal spur | 1 | 3.6 – 3.6 | 18.8 – 18.85 | 3.6 18.8 | ?? | ? |
| Claw 3 lengths | ||||||
| External primary branch | 5 | 9.5 – 17.0 | 23.0 – 56.7 | 12.6 40.7 | 2.9 12.7 | 10.5 |
| External base + secondary branch | 4 | 8.0 – 11.3 | 19.5 – 28.7 | 8.9 24.8 | 1.6 4.5 | 5.6 |
| External spur | 3 | 3.1 – 5.2 | 10.5 – 13.6 | 4.0 11.6 | 1.1 1.8 | 1.7 |
| Internal primary branch | 5 | 9.5 – 17.3 | 23.1 – 51.1 | 12.3 39.2 | 3.1 10.8 | 8.7 |
| Internal base + secondary branch | 4 | 8.0 – 9.1 | 18.4 – 31.2 | 8.6 24.5 | 0.6 6.5 | 9.2 |
| Internal spur | 3 | 3.5 – 4.7 | 9.5 – 13.1 | 4.0 11.7 | 0.6 1.9 | 2.8 |
| Claw 4 lengths | ||||||
| Anterior primary branch | 4 | 10.4 – 12.2 | 36.6 – 56.9 | 11.3 44.6 | 0.9 8.7 | 11.9 |
| Anterior base + secondary branch | 2 | 9.2 – 9.6 | 32.9 – 33.0 | 9.4 33.0 | 0.3 0.1 | ? |
| Anterior spur | 2 | 4.0 – 4.1 | 14.0 – 14.4 | 4.0 14.2 | 0.1 0.2 | ? |
| Posterior primary branch | 4 | 10.5 – 12.9 | 31.3 – 59.7 | 11.5 41.5 | 1.0 12.5 | 11.3 |
| Posterior base + secondary branch | 3 | 8.3 – 9.0 | 21.8 – 32.0 | 8.7 27.4 | 0.3 5.2 | 9.2 |
| Posterior spur | 2 | 4.3 – 4.7 | 10.5 – 16.9 | 4.5 13.7 | 0.3 4.5 | ? |
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.
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