plural noun
Tec·​to·​spon·​dy·​li | \ˌtektōˈspändəˌlī\

Definition of Tectospondyli 

in some classifications

: an order or other division of elasmobranch fishes typically having tectospondylic vertebrae and comprising the spiny dogfishes and related forms and the angelfish (genus Squatina) and formerly also the rays and sawfishes — compare batoidei , cyclospondyli

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History and Etymology for Tectospondyli

New Latin, probably from Latin tectum roof + New Latin -o- + -spondyli

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