| Habrotrocha aspera, whirling; trunk with granulated integument; head with bridge between trochal discs and a conspicuous point (arrow). (1) |
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| Habrotrocha aspera, creeping animal, focus plane on the granulated integument. H. aspera is a slow moving animal. (1) |
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| Habrotrocha aspera, head with upper lip and ligula. (1) |
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| Habrotrocha aspera; trophi with dental formula 2/2. .(1) |
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| Habrotrocha aspera; specimen from (3), whirling, dorsoventral view. .(2) |
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| Habrotrocha aspera; two aspects of the head. Left: focus plane on the upper lip. Right: focus plane slightly more ventral.(2) |
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| Differential diagnosis: can be confused with Philodina rugosa or Habrotrocha crenata. Philodina rugosa has a similar granulated integument, but has dental formula 3/3, has cervical eyespots (on the trunk) . The corona of P. rugosa is much wider. Habrotrocha crenata has dental formula 8/8 and lacks the ligula between the trochal discs. |
| Location: Germany, Nature Reserve Elmpt, moss (1); Kvitøya, Svalbard archipelago (2) |
| Habitat: moss (1); (2) |
| Date: 15/16.6.2013; coll.: 7/2017; img.: 19.11.2017 (2) |
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