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Temporal range: Mid Ordovician–Mid Devonian[1]
Cornulitid on a brachiopod valve (Upper Ordovician, SE Indiana)
Scientific classification e
Kingdom: Animalia
Phylum: Mollusca (?)
Class: Tentaculita
Order: Cornulitida
Cornulites cellulosus from Wenlock of Saaremaa, Estonia

Cornulitida is an extinct order of encrusting animals from the Tentaculita class, which were common across the globe in the Ordovician to Devonian oceans, and survived until the Carboniferous.[1][2][3]

The organisms had shells, and were subject to predation by boring and other means from the Ordovician onwards. Many survived attacks by predators.[1]

Their affinity is unknown; they have been placed in many phyla, and have been considered worms, corals, molluscs and more.[1] They appear to be closely related to other taxa of uncertain affinity, including the microconchids, trypanoporids and tentaculitids.[1]


  1. ^ a b c d e Vinn, O (2009). "Attempted predation on Early Paleozoic cornulitids". Palaeogeography Palaeoclimatology Palaeoecology 273: 87–91. doi:10.1016/j.palaeo.2008.12.004. 
  2. ^ Vinn, O (2013). "Cornulitid tubeworms from the Ordovician of eastern Baltic". Carnets de Géologie: 131–138. Retrieved 2013-07-25. 
  3. ^ Vinn, O; Wilson, M.A. (2013). "Silurian cornulitids of Estonia (Baltica)". Carnets de Géologie: 357–368. Retrieved 2013-12-27.