| Gastropus hyptopus , swimming specimen, lateral view. Focus plane on the red eyespot which is located centrally at the base of the brain (which is in contrast to Gastropus minor >> posterior end of the brain) and foot. (3) |
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| Gastropus hyptopus, same specimen, focus plane on the dorsal antenna (arrow) which is located in the middle of the dorsal side of the lorica (which is in contrast to Gastropus minor: >> posterior third). Also in focus is one of the lateral antennas (arrowhead). (3) |
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| Gastropus hyptopus , slightly compressed specimen. The arrowheads mark the duct of the retrocerebral organ. Also visible is the conspicuous eyespot. (2) |
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| Gastropus hyptopus; ventral view; focus plane on the ventral foot opening. Like Gastropus minor this species has a ventrally located foot with 2 toes (which is in contrast to Gastropus stylifer with one toe). Specimen from (1) |
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| Gastropus hyptopus, virgate trophi. Left: In contrast to Gastropus minor the tips of the rami have 5 dents (arrowheads) (1). Right: trophi of a specimen that had been swallowed (and digested) by an Asplanchna rotifer. (6) |
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| Gastropus hyptopus, specimen from (5) |
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| Location (5): nature reserve NSG Unteres Odertal; BB, Germany; Eisvogelbrücke |
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| Habitat : "aufwuchs" on artificially exposed microslides (5). Plankton sample (6) |
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| Date: 15.05.2023 (5); 11.05.2024 (6) |
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Location (3): Haselbecke,Felderbachtal, Hattingen, NRW, Germany, pond |
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| Habitat (3): plankton |
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| Date (3): 17.07.2022 |
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| Location: Anhausen near Augsburg, Bavaria, Germany; Fischteiche (1); Hattingen Felderbachtal, NRW; Germany (2) |
| Habitat: Plankton (1); (2), 3 |
| Date: 10.8.2012 (1); 01.05.2020 (2) |
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