Tully monster

noun

A soft-bodied bilaterian animal, notable for its dubious taxonomic status, †Tullimonstrum gregarium, which lived in shallow tropical coastal waters of muddy estuaries during the Pennsylvanian geological period, about 300 million years ago. This animal has an odd appearance, having a mostly cigar-shaped body, with a triangular tail fin, two long stalked eyes, and a proboscis tipped with a mouth-like appendage.

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Meanings

Tully monster1

nounTully monster (plural Tully monsters)

plural Tully monsters · alternative Tully Monster

  1. A soft-bodied bilaterian animal, notable for its dubious taxonomic status, †Tullimonstrum gregarium, which lived in shallow tropical coastal waters of muddy estuaries during the Pennsylvanian geological period, about 300 million years ago. This animal has an odd appearance, having a mostly cigar-shaped body, with a triangular tail fin, two long stalked eyes, and a proboscis tipped with a mouth-like appendage.

Tully Monster2

nounTully Monster (plural Tully Monsters)

plural Tully Monsters

  1. Alternative letter-case form of Tully monster.

Origin

Named after amateur collector Francis Tully, who found the first of these fossils in 1955.

Full word history & related roots →
Cite this entry
APA

Tully monster. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/Tully%20monster

MLA

“Tully monster.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Tully%20monster. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “Tully monster,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/Tully%20monster.

Source: Tully monster on Wiktionary, CC BY-SA 4.0.