| Holotype male body length | 12.5 mm | 18 mm | Maximum 17 mm observed |
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| Eyes | Kidney-shaped | Small, kidney-shaped | Variable in size from almost round to reniform. |
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| Antenna 1 length | Distinctly shorter than half of body length | A little longer than 1/3 of body length | Variable |
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| Antenna 1 flagellum | 16–17 articles | Not specified | 22–33 articles |
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| Antenna 2 gland cone | Long, straight, almost reaching the distal end of peduncular article 3 | Not described (“weakly and shortly setose”) | Short, half as long as the peduncular article 3 |
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| Mandibular palp (article 3) | 1 group of B-setae. C-seta absent. | Not described | 2 groups of B-setae. (C-seta not mentioned, implying absence) |
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| Pereopod 3 & 4 seta length (merus & carpus) | Setae longer than the article diameter (P3), as long as the article diameter (P4). | Very short setae; posterior margin of merus with “single groups of short bristles”. | Setae at most as long as article diameter (P3), always shorter than article diameter (P4). |
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| Coxal plates 1–4 | Bear one long, simple seta on their inner surfaces. | No mention of long inner setae. | No mention of long inner setae. |
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| Epimeral plate 3 | Posterodistal corner slightly pointed. | Posterodistal corner hardly produced, almost rectangular. | Posterodistal corner varies from almost rectangular to moderately pointed. |
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| Uropod 3 (endopod/exopod ratio) | ~0.64 (Endopod 0.64x length of exopod) | Similar to G. lacustris (implies well-setose exopod) | Endopod ~0.75x (3/4) length of exopod. Exopod lacks setation on the lower half. |
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