Knightia

Nye-tee-ah.
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Benjamin Gutierrez

Vertebrate Paleontologist

Benjamin Gutierrez is a leading expert on dinosaurs, particularly the mighty theropods. His fieldwork in South America has uncovered new species and provided insights into dinosaur social structures.

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Name

Knightia

Phonetic

Nye-tee-ah.

Named By

Jordan‭ ‬-‭ ‬1907.

Classification

Chordata,‭ ‬Actinopterygii,‭ ‬Clupeiformes,‭ ‬Clupeidae,‭ ‬Pellonulinae.

Diet

Zooplankton,‭ ‬small invertebrates and possibly very small fish and fry.

Species

K.‭ ‬alta,‭ ‬K.‭ ‬branneri,‭ ‬K.‭ ‬eocaena,‭ ‬K.‭ ‬humulus

Size

Depending upon species up to‭ ‬25‭ ‬centimetres long,‭ ‬the largest specimens slightly bigger.

Known locations

USA,‭ ‬Wyoming‭ ‬-‭ ‬Green River Formation.

Time Period

Eocene.

Fossil representation

So numerous no one knows exactly how many specimens have been recovered.

In Depth

       Knightia were small freshwater fish often described as‭ ‘‬herring-like‭’ ‬that lived in North America during the Eocene period.‭ ‬Also because Knightia were schooling fish they are often preserved still in their shoals with some specimens even being preserved on top of each other.‭ ‬This is why so many fossils of this fish are known,‭ ‬and why Knightia specimens are one of the most commonly traded fossils on the market.

       The majority of Knightia specimens are quite small,‭ ‬but some large specimens around twenty-five centimetres long are known.‭ ‬Knightia are often so well preserved that the scutes than run from the head to the median‭ (‬middle‭) ‬fins across the back and belly are often visible. Although Knightia may seem a small and unimportant fish,‭ ‬their sheer numbers strongly suggest that they would have formed an important part of their ecosystems biomass,‭ ‬being an abundant food supply for predators.

       Other fish from the Green River Formation include Heliobatis and Diplomystus.

Further Reading

– The fossil fishes of California, with supplementary notes on other species of extinct fishes. – University of California Publications, Bulletin of the Department of Geology 5(7):95-144. – D. S. Jordan – 1907. – The paleontology of the Green River Formation, with a review of the fish fauna. – Wyoming Geol. Surv., Bull. 63, pp. 85. – L. Grande – 1980. – A Revision of the Fossil Genus Knightia, With a Description of a New Genus From the Green River Formation (Teleostei, Clupeidae). – American Museum Novitates. – Lance Grande – 1982.

SPECIES SPOTLIGHT