Flexicalymene meeki (fossil trilobite) (Richmondian Stage, Upper Ordovician; Southgate Hill Rt. 1 roadcut, near St. Leon, Indiana, USA) 2

            Flexicalymene meeki (Foerste, 1910) - fossil trilobite from the Ordovician of Indiana, USA.

The nominal species "Flexicalymene retrorsa" is a junior subjective synonym of Flexicalymene meeki

Trilobites are extinct marine arthropods.  They first appear in Lower Cambrian rocks and the entire group went extinct at the end of the Permian.  Trilobites had a calcitic exoskeleton and nonmineralizing parts underneath (legs, gills, gut, etc.).  The calcite skeleton is most commonly preserved in the fossil record, although soft-part preservation is known in some trilobites (Ex: Burgess Shale and Hunsruck Slate).  Trilobites had a head (cephalon), a body of many segments (thorax), and a tail (pygidium).  Molts and carcasses usually fell apart quickly - most trilobite fossils are isolated parts of the head (cranidium and free cheeks), individual thoracic segments, or isolated pygidia.  The name "trilobite" was introduced in 1771 by Johann Ernst Immanuel Walch and refers to the tripartite division of the trilobite body - it has a central axial lobe that runs longitudinally from the head to the tail, plus two side lobes (pleural lobes).

The gray masses on this specimen are bryozoan colonies encrusting the trilobite's exoskeleton.

Classification: Animalia, Arthropoda, Trilobita, Polymerida, Calymenidae

Stratigraphy: Richmondian Stage (likely from the Waynesville Formation or possibly the Liberty Formation), upper Cincinnatian Series, upper Upper Ordovician

Locality: Southgate Hill outcrop - large roadcut along Rt. 1 at Southgate Hill, north of the town of St. Leon, southeastern Franklin County, southeastern Indiana, USA (39° 20' 23.13" North, 84° 57' 09.15" West)

Some rights reserved

Taken on: May 4, 2024

Tags:

Flexicalymene

meeki

fossil

trilobite

Richmond

Richmondian

Stage

Cincinnatian

Series

Upper

Ordovician

Indiana

Southgate

Hill

South

Gate

St.

Leon

Rt.

fossils

trilobites « less

Sets appears in: • Ohio Rocks, Minerals, Fossils • Ordovician Rocks & Fossils more » • Cincinnatian Fossils and Rocks (Upper Ordovician of the Cincinnati, Ohio region, USA) • Trilobite Fossils « less

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