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Jaekelocarpus Temporal range: Pennsylvanian (Morrowan), 318.1–314.6 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Three-dimensional reconstruction of Jaekelocarpus oklahomensis (UWBM74305) with internal bars and bar-like structures (violet)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Echinodermata
Class:	†Stylophora
Order:	†Mitrata
Family:	†Jaekelocarpidae
Genus:	†Jaekelocarpus Kolata et al., 1991
Species:	†J. oklahomensis
Binomial name
†Jaekelocarpus oklahomensis Kolata et al., 1991

Jaekelocarpus is a genus of mitrate stylophoran known from the Morrowan age of the Golf Course Formation, southern Oklahoma, US. It possessed two billaterally symmetrical complexes of four internal bars. The morphological similarity of these structures to the gill bars of cephalochordates and enteropneusts is considered a likely indicator of their homology.

References

1. Kolata, Dennis R.; Frest, Terrence J.; Mapes, Royal H. (September 1991). "The youngest carpoid: occurrence, affinities, and life mode of a Pennsylvanian (Morrowan) mitrate from Oklahoma". Journal of Paleontology. 65 (5): 844–855. Bibcode:1991JPal...65..844K. doi:10.1017/S0022336000037811. ISSN 0022-3360.
2. Dominguez, Patrício; Jacobson, Antone G.; Jefferies, Richard P. S. (2002-06-20). "Paired gill slits in a fossil with a calcite skeleton". Nature. 417 (6891): 841–844. Bibcode:2002Natur.417..841D. doi:10.1038/nature00805. ISSN 1476-4687. PMID 12075349.
3. Álvarez-Armada, Nidia; Cameron, Christopher B.; Bauer, Jennifer E.; Rahman, Imran A. (2022-05-11). "Heterochrony and parallel evolution of echinoderm, hemichordate and cephalochordate internal bars". Proceedings of the Royal Society B: Biological Sciences. 289 (1974). doi:10.1098/rspb.2022.0258. ISSN 0962-8452. PMC 9091856. PMID 35538784.

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