Jeletzkya

Jeletzkya; Temporal range: Early Pennsylvanian PreꞒ Ꞓ O S D C P T J K Pg N
	Artist's reconstruction of J. douglassae swimming above a Tullimonstrum.
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Coleoidea
Superorder:	†Belemnoidea
Genus:	†Jeletzkya
Species:	†J. douglassae

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] J. douglassae is 14 mm long.

References

^ 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.

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[1] 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.

[2] 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.

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