The first Silurian trilobite with three‐dimensionally preserved soft parts reveals novel appendage morphology. (25th August 2021)

• Record Type: Journal Article
• Authors: Siveter, Derek J.; Fortey, Richard A.; Briggs, Derek E. G.; Siveter, David J.; Sutton, Mark D.
• Editors: Zhang, Xi‐Guang
• Is Part Of: Papers in palaeontology. Volume 7:Number 4(2021)
• Page Start: 2245
• Page End: 2253
• Publication Date: 2021-08-25
• Subjects: Herefordshire Lagerstätte -- Silurian -- Arthropoda -- Trilobita -- appendages -- functional morphology; Paleontology -- Periodicals; 560.5
• DOI: 10.1002/spp2.1401
• Languages: English
• ISSNs: 2056-2802

Abstract

Abstract: The first Silurian trilobite known with soft parts preserved, a Dalmanites species, is described from the Herefordshire Lagerstätte. Biramous appendages and much of the alimentary system are evident. High‐fidelity three‐dimensional preservation reveals a novel arrangement of the exopod, in which successive filaments are connected by a presumed membrane. This morphology explains a misinterpretation of the exopod as supporting spiral structures, originally reported nearly 150 years ago. Comparison with other trilobite limbs indicates that the exopod morphology of Dalmanites is present in other members of Phacopida. The function of the exopod is considered to be primarily respiratory.