30144 - Top Well Preserved 1.39 Inch Tsinania laebigate Cambrian Trilobite - China Brachylophosaurus 2 Type spec location: MNB

2 Type spec location: MNB Main mass: Said Yousfi Comments: Submitted by Ansgar Greshake Institutions

Mimetaster hexagonalis and Marrella have long been regarded as closely related (Stürmer & Bergström 1976

The rostrum most likely would have had electrosensors to detect food in the water below them like most modern sharks and some rays

Samples (polished thin-sections) also were studied under scanning electron microscope (Research Technical Services – UA)

The matrix is formed by very fine-grained plagioclase

30144 - Top Well Preserved 1.39 Inch Tsinania laebigate Cambrian Trilobite - China Brachylophosaurus 2 Type spec location: MNBTsinania, Walcott 1914 (trilobite) Trilobita Corynexochida Tsinaniidae PaleoDB taxon number: 19709 Parent taxon: Tsinaniidae according to P. A. Jell and J. M. Adrain 2002 See also Sepkoski 2002 Sister taxa: Leiaspis, Shergoldia, Taipaikia, Zhujia Subtaxa: Tsinania canens View classification Ecology: nektobenthic carnivore Environments: carbonate (2 collections), (1), marine (1), slope (1), offshore shelf (1) Age range: 488. 3 to 478. 6 Ma