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Squatirhina, the Glossary

Squatirhina is a genus of Late Cretaceous cartilaginous fish whose fossils have been found in the Aguja and Pen Formations of Big Bend National Park, Texas, USA.^[1]

Aguja Formation

The Aguja Formation is a geological formation in North America, exposed in Texas, United States and Chihuahua and Coahuila in Mexico, whose strata date back to the Late Cretaceous.

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Animal

Animals are multicellular, eukaryotic organisms in the biological kingdom Animalia.

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Big Bend National Park

Big Bend National Park is an American national park located in West Texas, bordering Mexico.

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Chondrichthyes

Chondrichthyes is a class of jawed fish that contains the cartilaginous fish or chondrichthyans, which all have skeletons primarily composed of cartilage.

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A chordate is a deuterostomic animal belonging to the phylum Chordata. All chordates possess, at some point during their larval or adult stages, five distinctive physical characteristics (synapomorphies) that distinguish them from other taxa.

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Late Cretaceous

The Late Cretaceous (100.5–66 Ma) is the younger of two epochs into which the Cretaceous Period is divided in the geologic time scale.

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List of prehistoric cartilaginous fish genera

This list of prehistoric cartilaginous fish genera is an attempt to create a comprehensive listing of all genera that have ever been included in the class chondrichthyes and are known from the fossil record.

See Squatirhina and List of prehistoric cartilaginous fish genera