Published December 24, 2025
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TABLE 1 in Colimene, a new genus for three species previously assigned to Dynomene Desmarest, 1823 (Crustacea, Decapoda, Brachyura, Dynomenidae)
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Description
TABLE 1. Differences between Colimene gen. nov., Dynomene and Hirsutodynomene.
| Colimene gen. nov. | Dynomene s. str. | Hirsutodynomene | |
|---|---|---|---|
| Carapace | Distinctly wider than long; posterolateral margins gently converging; subquadrate (Figs. 1A, 2A, B, 3A, 4A, F, 6A, 9A, D) | As long as wide or slightly wider than long; posterolateral margins strongly converging; subcircular or almost so (Fig. 1B) | Carapace much wider than long, commonly subcircular; posterolateral margins strongly converging (Fig. 1C) |
| Carapace regions | Surface smooth or almost so; regions not demarcated except for epigastric region (Figs. 1A, 2A, B, 3A, 4A, D, F, I, 6A, 9A, D) | Surface granulose to almost smooth; regions weakly demarcated (Fig. 1B) | Surface granulose or smooth; regions distinctly demarcated (Fig. 1C) |
| Subhepatic region and infraorbital margin | Infraorbital margin projecting anteriorly, clearly visible in dorsal view; subhepatic region gently swollen, tuberculate or granulate (Figs. 1A, 12A) | Infraorbital margin not projecting anteriorly, not visible in dorsal view (Fig. 1B) | Infraorbital margin not projecting anteriorly, not visible in dorsal view (Fig. 1C) |
| Pterygostomial region | Gently swollen, with cluster of granules or tubercles (Figs. 1D, 4E, J, 5A) | Not raised, smooth (Fig. 1E) | Not raised, smooth or granulate (Fig. 1F) |
| Chelipeds | Elongate; basis-ischium and merus long; chelipeds unable to appress against carapace (Figs. 2A, 4A, F, 9A, B) | Short; basis-ischium and merus very short; chelipeds closely appressed to carapace when retracted (Fig. 1E) | Short; basis-ischium and merus very short; chelipeds able to appress against carapace when retracted (McLay 1999: fig. 17e) |
| Chela | Elongate, slender; outer surfaces almost smooth; proximal part of inner surface, near carpus, with prominent median tooth or spine (Figs. 2A, D–F, 3C, D, 4B, C, G, H, 5D, 9A, B, 12B) | Short, stout; outer surfaces granulate or tuberculate; proximal part of inner surface, near carpus, with low rounded tooth (Fig. 1I, J) | Short, stout; outer surfaces granulate or tuberculate; proximal part of inner surface, near carpus, with low tooth (McLay 1999: fig. 23c, d) |
| Fingers of male cheliped | Fingers elongate, cutting edge of pollex smooth, unarmed (Figs. 2D, E, 4B, C, G, H, 9B, E) | Fingers short, curved; cutting edge of pollex with 1 large tooth and several smaller teeth (Fig. 1I, J) | Fingers short, curved; cutting edge of pollex with 1 large tooth and several smaller teeth or several large equal-sized teeth (McLay 1999: fig. 23c) |
| Ambulatory legs | Merus, carpus and propodus distinctly more elongate (Figs. 2A, G, 3E–I, 4A, F, 6A, 9A, D) | Merus, carpus and propodus very short (McLay 1999: fig. 17a, b) | Merus, carpus and propodus very short (McLay 1999: 17e) |
| Fused male thoracic sternites 1–3 | Relatively broad, forming a wide pentagonal structure (Figs. 1D, 3B, 5E) | Relatively narrower, forming a more quadrate structure (Fig. 1E) | Relatively narrower, lateral margins sinuous, forming bell-shaped structure (Fig. 1F) |
| Male pleon | Very broad, with somites 2 and 3 prominently narrow, waist-like (Figs. 1G, 2L) | Distinctly narrower, somites 2 and 3 less narrow, no obvious waist visible (Fig. 1H) | Distinctly narrower, somites 2 and 3 less narrow, no obvious waist visible (Fig. 1F) |
Notes
Published as part of Ng, Peter K. L. & Ng, Paul Y. C., 2025, Colimene, a new genus for three species previously assigned to Dynomene Desmarest, 1823 (Crustacea, Decapoda, Brachyura, Dynomenidae), pp. 353 in Zootaxa 5737 (3) on page 353, DOI: 10.11646/zootaxa.5737.3.3, http://zenodo.org/record/19137349
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Additional details
Identifiers
References
- McLay, C. L. (1999) Crustacea Decapoda: Revision of the family Dynomenidae. In: Crosnier, A. (Ed.), Resultats des Campagnes MUSORSTOM Volume 20. Memoires du Museum national d'Histoire naturelle, 180, pp. 427-569, figs. 1 - 40.