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Callichimaeroidea
Taxonomy
Callichimaeroidea was named by Luque et al. (2019). It is considered to be a form taxon. Its type is Callichimaera. It was considered monophyletic by Luque et al. (2019).
It was assigned to Brachyura by Luque et al. (2019); and to Callichimaeroida by Luque et al. (2023).
It was assigned to Brachyura by Luque et al. (2019); and to Callichimaeroida by Luque et al. (2023).
Subtaxa
Synonymy list
| Year | Name and author |
|---|---|
| 2019 | Callichimaeroidea Luque et al. |
| 2023 | Callichimaeroidea Luque et al. p. 1 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
Superfm. †Callichimaeroidea Luque et al. 2019
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Fm. †Callichimaeridae Luque et al. 2019
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Luque et al. 2019 | Crabs with carapaces longer than wide, small and fusiform (Callichimaeridae), or large and ovate (Retrorsichelidae). Sternites 1 to 4 are fused and visible ventrally, forming an elongated sternal crown; sternite 4 is not mesially depressed; sternites 5 to 7 are unfused and axially sulcate by linea media; sternite 5 is very wide, almost as wide as the carapace; suture 5/6 is complete, but lacks a true sterno-pleonal cavity. The pleon is symmetrical, sexually dimorphic, narrower in males than females, and in both sexes narrower than sternite 6 (Callichimaeridae). Pleonal somites are not fused, lacking articulating rings and bearing dorsal median tubercle or crest; pleonites 1 to 3 are exposed subdorsally; uropods or uropodal plates are absent. True orbits, orbital fissures, or any protective structures are absent. Eyes are large in Callichimaeridae but are likely small and reduced in Retrorsichelidae. Chelipeds (claws) are isochelous, and the manus is stout, with pollex or fixed finger slightly (Retrorsichelidae) or strongly (Callichimaeridae) deflected downward; chelipeds are folded ventrally and posteriorly beneath carapace. Pereopods (legs) P2 and P3 are much larger than P4 and P5; P4 and P5 are situated subdorsally and directed posteriorly, lacking spines, neither subchelate nor modified for carrying or grasping. In Callichimaeridae, P2 and P3 are large and wide and positioned laterally, with distal podomeres flattened and paddle-like; P4 and P5 are short and narrow, with the dorsal longitudinal keel neither flattened nor paddle-like; P5 is the smallest, well developed but reduced, and carried subdorsally. In Retrorsichelidae, P2 and P3 are apparently large and positioned ventrally; at least one pereopod bears flattened distal articles. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Turnsek 1997, Aberhan 1992 | |||||
Age range: base of the Late/Upper Cenomanian to the top of the Middle Turonian or 100.50000 to 89.80000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Cenomanian | Colombia (Boyaca) | Callichimaera perplexa (224190) | |
| Middle Turonian | USA (Wyoming) | Callichimaera perplexa (233801) |