... characterises the Middle Devonian, and especially the Lower-Middle Eifelian. Three main sub-associations can be observed: IV) The Dechenella (Dechenellinae, Proetidae) and Nyterops (Phacopinae, Phacopidae) Association characterises the Upper Eifelian-Lower Givetian. Dechenellinae appear to be slightly...

... in representatives of three distinct subfamilies (Proetinae: Chatterton, 1971 ; Dechenellinae: Chatterton et al. 1999 ; Cyrtosymbolinae: Lerosey-Aubril & Feist, 2005 c ), living in three different epochs (Early, Middle and Late Devonian, respectively), and that these larval proportions seem...

... by Chatterton et al. (1999) , lacking the typical reentrant posterior margin of the “type B anaprotaspides.” This kind of larva has been described in the proetide trilobites Devonoproetus talenti (Proetinae; Chatterton, 1971 ) and Dechenella sp. (Dechenellinae; Chatterton et al., 1999...