| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Callichimaera perplexa
Taxonomy
Callichimaera perplexa was named by Luque et al. (2019). Its type specimen is IGM p881215, an exoskeleton (ventral animal), and it is a compression fossil. It is the type species of Callichimaera.
Synonymy list
| Year | Name and author |
|---|---|
| 2019 | Callichimaera perplexa Luque et al. p. 4 figs. 1A-C |
Is something missing? Join the Paleobiology Database and enter the data
|
|
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.
†Callichimaera perplexa Luque et al. 2019
show all | hide all
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Luque et al. 2019 | Small crabs (carapace width, <10 mm; carapace length, <16 mm) that have a carapace longer than wide, fusiform, with distinct cervical and branchiocardiac grooves, and bearing axial longitudinal ridge and postfrontal ridges. Sternites 1 to 4 are visible ventrally; sternites 4 to 7 are unfused, with sutures distinct, and axially sulcate by linea media; all sternites are unique in shape and size; sternite 5 is very wide; suture 5/6 is complete, irregular, and sinuous, lacking true sterno-pleonal cavity; thoracic gonopores are not recognized in males or females. The pleon is symmetrical, sexually dimorphic, narrower in males than females, and in both sexes narrower than sternite 6. Pleonal somites are not fused, lacking articulating rings and bearing dorsal median tubercle; pleonites 1 to 3 are exposed subdorsally, and lacking pleonal, sternal, or appendicular locking mechanisms; uropods or uropodal plates are absent. The rostrum is bifid; first and second antennae are short, between the eyes; eyes are very large—the cornea is strongly dilated, subglobular, bearing mostly hexagonal facets, and a short ocular peduncle, lacking orbits, orbital fissures, or any protective structure; third maxillipeds are pediform, elongate, with “crista dentata”; lengths of the ischium and merus are slightly longer than the length of the palp, and the merus is positioned far back from anterior of carapace or basal antennal segments. Chelipeds (claws) are isochelous, the manus is stout, with fixed finger deflected ~90°; pereopods (legs P2 and P3) are large and wide, with propodus and dactylus flattened and paddle-like; P4 and P5 are short and narrow, with the dorsal longitudinal keel, lacking spines, not subchelate or modified to carry objects, and neither flattened nor paddle-like; P5 is the smallest, well developed but reduced, and carried subdorsally. |
Measurements
No measurements are available
|
|
||||
|
|||||
|
|
||||
|
|
||||
| Source: f = family, o = order, c = class | |||||
| References: Fearon and Clapham 2023, 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) |