Jeletzkya douglassae is a fossil belemnoid from the early Pennsylvanian Mazon Creek lagerstätten and represents the earliest known crown-group squid.[1] Non-mineralized anatomy is preserved and comprises ten hooked tentacles and a radula. It is too poorly understood for assignment to any particular cephalopod taxon.[2] In 2026, it is considered as a synonym of Saundersites illinoisiensis.[3] It had shell about 23.5 mm (0.93 in) long.[1]
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| Artist's reconstruction of Jeletzkya douglassae swimming above a Tullimonstrum. | |
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| Genus: | †Jeletzkya Johnson & Richardson, 1968 |
| Species: | †J. douglassae |
| Binomial name | |
| †Jeletzkya douglassae Johnson & Richardson, 1968 | |
References
edit- 1 2 Johnson, RG; Richardson ES, Jr (1968-02-02). "Ten-armed fossil cephalopod from the Pennsylvanian of Illinois". Science. 159 (814): 526–8. doi:10.1126/science.159.3814.526. JSTOR 1722879. PMID 5635152. S2CID 26571989.
- ↑ Whalen, Christopher D.; Landman, Neil H. (2022-03-08). "Fossil coleoid cephalopod from the Mississippian Bear Gulch Lagerstätte sheds light on early vampyropod evolution". Nature Communications. 13 (1): 1107. doi:10.1038/s41467-022-28333-5. ISSN 2041-1723. PMC 8904582. PMID 35260548.
- ↑ Clements, Thomas; Rahman, Imran Alexander; Spencer, Alan R. T.; Klug, Christian; Fuchs, Dirk; Rouget, Isabelle; Kruta, Isabelle; Schöder, Sebastian; Wittry, Jack; Bath Enright, Orla G.; Gueriau, Pierre (2026-04-08). "Synchrotron data reveal nautiloid characters in Pohlsepia mazonensis , refuting a Palaeozoic origin for octobrachians". Proceedings of the Royal Society B Biological Sciences. 293 (2068). doi:10.1098/rspb.2025.2369. ISSN 1471-2954.
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