The type material of Scotiella Delo 1935 is redescribed and the generic diagnosis emended to include trilobites in which the anterior and median lateral glabellar furrows are both strongly and poorly defined. The genus now embraces the species Scotiella logani (Hall 1860), S. conservatrix (McLearn 1924) new combination, S. minor (M'Coy 1851), S. samsonowiczi Tomczykowa 1962b and S. opatowiensis...

Queuing behaviour has been documented in marine arthropods from Cambrian to modern oceans. It was previously hypothesized that this provided energy savings through hydrodynamic drafting, with trilobites following positions produce less drag than those leading. In study, we evaluate the hydrodynamics of queuing Devonian trilobite Trimerocephalus chopini using computational fluid dynamics. The re...