20571 - New Species Symphysurus ebbestadi n. sp. With Preserved Digestive Tube and Sensory Lines Ordovician
20571 - New Species Symphysurus ebbestadi n. sp. With Preserved Digestive Tube and Sensory Lines Ordovician 20571 - New Species Symphysurus ebbestadi n. sp. With Preserved Digestive Tube and Sensory Lines Ordovician 20571 - New Species Symphysurus ebbestadi n. sp. With Preserved Digestive Tube and Sensory Lines Ordovician 20571 - New Species Symphysurus ebbestadi n. sp. With Preserved Digestive Tube and Sensory Lines Ordovician 20571 - New Species Symphysurus ebbestadi n. sp. With Preserved Digestive Tube and Sensory Lines Ordovician 20571 - New Species Symphysurus ebbestadi n. sp. With Preserved Digestive Tube and Sensory Lines Ordovician 20571 - New Species Symphysurus ebbestadi n. sp. With Preserved Digestive Tube and Sensory Lines Ordovician 20571 - New Species Symphysurus ebbestadi n. sp. With Preserved Digestive Tube and Sensory Lines Ordovician 20571 - New Species Symphysurus ebbestadi n. sp. With Preserved Digestive Tube and Sensory Lines Ordovician

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20571 - New Species Symphysurus ebbestadi n. sp. With Preserved Digestive Tube and Sensory Lines Ordovician

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Species
Symphysurus ebbestadi n. sp - Trilobite
Age
Lower Ordovician, Upper Tremadocian stage (~480 Million Years)
Location
North of Zagora, South Morocco
Formation
Fezouata Formation (Outer Feijas Group)
Size
50.9 mm   •    in
Weight
585 g   •    oz
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Description

It is a good example because it is intact, with vestige of soft parts that. You can appreciate is the distal part of the digestive tube in the pigidium. Everything else you see is the system of sensory lines (terrace ridges) that are already described in the article (1), and which in this specimen are conserved highlighted by iron oxides. Positive and negative specimen.

Publication:

(1) Gutiérrez-Marco, J. C., Rábano, I., García-Bellido, D. C. 2019: "The nileid trilobite Symphysurus from upper Tremadocian strata of the Moroccan Anti-Atlas: taxonomic reappraisal and palaeoenvironmental implications" Fossils and Strata, No. 64, pp. 155-171.

The Fezouata Formation occurs in the lower part of the Lower to lower Middle Ordovician Outer Feijas Group, in the western, central and eastern Anti-Atlas
Mountains, southern Morocco (Destombes et al.1985; Gutierrez-Marco & Martin 2016).
It comes from The Konservat-Lagerstätten of Lower Fezouata Fm that spans the entire Tremadoc stage of the Ordovician system and is only present in the Moroccan Anti-Atlas. The discovery of the Fezouata biota in the latest Tremadocian of southeastern Morocco has significantly changed our understanding of the early Phanerozoic radiation. The shelly fossil record shows a well-recognized pattern of macroevolutionary stasis between the Cambrian Explosion and the Great Ordovician Biodiversification Event, but the rich soft-bodied Fezouata biota paints a different evolutionary picture. The Fezouata assemblage includes a considerable component of Cambrian holdovers alongside a surprising number of crown group taxa previously unknown to have evolved by the Early Ordovician. Study of the Fezouata biota is in its early stages, and future discoveries will continue to enrich our view of the dynamics of the early Phanerozoic radiation and of the nature of the fossil record.

 

Symphysurus sp, Goldfuss 1843 (trilobite)
Trilobita - Asaphida - Nileidae

See also Fortey 1975, Jell and Adrain 2002 and Sepkoski 2002

Ecology: fast-moving low-level epifaunal deposit feeder

Environments: marine , deep subtidal shelf , offshore , offshore shelf , carbonate , slope, shallow subtidal, transition zone/lower shoreface, shoreface

Age range: 478.6 to 449.5 Ma

Distribution:

• Ordovician of China, Colombia, the Czech Republic, France, Iran , Morocco, Norway,  Sweden

• Llandeilo of China 

• Whiterockian of United States 

• Arenig of Argentina , China , France , Morocco , Sweden

• Klabava of the Czech Republic, France 
Symphysurus sp: Fossilworks (Paleobiology Database)
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