Myxinikela siroka is represented by holotype FMNH PF15373 and paratype FMNH PF8472 and is interpreted as a stem or putative total-group hagfish, not a crown-Myxini member.
claim:taxon:myxinikela:taxonomyMyxinikela siroka
A Moscovian cyclostome represented by a holotype and paratype whose revised anatomy combines general cyclostome and hagfish specializations.
Represented range310–307 Ma
Content packageearly-fishes
PBDBtxn:178986
Evidence boundary
Automated checks cover structure, identifiers, translations and links only; maintainer and external expert review are not complete.
Claim ledger
Both represented Myxinikela specimens come from the Moscovian Francis Creek Shale at the former Pit 11 locality in Illinois; no broader distribution is inferred.
claim:taxon:myxinikela:biogeographyThe fossils preserve body outlines and soft-tissue traces but do not directly establish diet, slime production, habitat preference or feeding guild.
claim:taxon:myxinikela:ecologyThe two specimens preserve a cyclostome–hagfish anatomical mosaic, with body lengths of 73.3 and 62.5 mm and multiple structures whose interpretation depends on preservation.
claim:taxon:myxinikela:morphologyThe displayed 310–307 Ma interval bounds the represented Francis Creek Shale specimens and is not the duration or global first appearance of hagfishes.
claim:taxon:myxinikela:fossil-rangeKnown limits
- A missing branch or fossil occurrence does not imply biological absence. Internal nodes are not calibrated divergence estimates.
References
- A Paleozoic stem hagfish Myxinikela siroka—revised anatomy and implications for evolution of the living jawless vertebrate lineagesMiyashita, T. · 2020 · DOI 10.1139/cjz-2020-0046
- Open Tree of Life web servicesOpenTreeOfLife Project
- The Paleobiology Database application programming interfacePeters, S.E.; McClennen, M. · 2016 · DOI 10.1017/pab.2015.39
- Denormalized occurrence and taxon tables of the Paleobiology DatabaseThe Paleobiology Database Community; Kocsis, Á.T. · 2026 · DOI 10.5281/zenodo.21620933