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Temporal range: Early Pennsylvanian
Jeletzkya douglassae.jpg
artist's reconstruction of J. douglassae
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Coleoidea
Order: Teuthida
Genus: Jeletzkya
Species: J. douglassae

Jeletzkya douglassae is a fossil coleoid 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.


  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.