Comitas allani

This extinct marine species was found in Lower Pleistocene strata off Hawke’s Bay, New Zealand. The type specimen is in the Auckland Museum.

Comitas allani is what paleontologists call an index fossil for the Bortonian stage (Middle Eocene, roughly 40 million years ago). Because it was so specialized to the environment of that specific time, its "extinction" in the fossil record is used by geologists as a biological boundary marker. When you stop finding C. allani in a sediment layer, it's often the primary signal to geologists that they have moved out of the Middle Eocene and into a new epoch.^[2]

• A.W.B. Powell (1942), The New Zealand Recent and Fossil Mollusca of the family Turridae with general notes on Turrid nomenclature and systematics
• A.W.B. Powell (1942), Bulletin of the Auckland Institute and Museum, 2 p. .59, pi. 10, fig. 6
• Maxwell, P.A. (2009). Cenozoic Mollusca. pp 232–254 in Gordon, D.P. (ed.) New Zealand inventory of biodiversity. Volume one. Kingdom Animalia: Radiata, Lophotrochozoa, Deuterostomia. Canterbury University Press, Christchurch.

• Auckland Museum: Comitas allani (holotype)
• Tucker Abbott, Indo-Pacific mollusca" vol. 2: Comitas allani; Academy of Natural Sciences of Philadelphia; Philadelphia , Pennsylvania, 19103 U.S.A.

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