...Figure 5. Spine distribution in early meraspid cranidium of Cyphaspis (a), and in early meraspid cranidium (b) and librigena (c) of Otarionella . Bd – dorsal spine of the librigenal lateral border; Blm – long marginal spine of the librigenal lateral border; Bsm – short marginal spine...

... CC028 and CC029. 12– Cyphaspis A van Viersen, 2006: dorsal (12a), lateral (12b, 12c) and frontal (12d) views of internal mould of articulated specimen, PC009. 13– Thysanopeltella (Septimopeltis) magnispina (Maillieux, 1938): dorsal view (13a), counterpart (13c) and detail of cephalon (13b...

... and Dra Valley Five other samples were added according to their taxonomic composition and from DCA results: TT-Emb, Tis-Emb02, JO-Emb15, JO-Emb16 and Tal-Emb25 Morocops , Cyphaspis and Austerops represent the most widespread genera Most diverse association of the whole Devonian...

...Figure 8. Trilobites from the ‘Chefar el Ahmar’ Formation, Lower Devonian, upper Emsian, Saoura Valley, Algeria. (a–d) Cyphaspis ? agayuara Chatterton et al . 2006 , Erg el Djemel section, Di/UO/021 (Ed3n2): (a–c) cephalon in dorsal, frontal...

... are rare, but surprisingly they are of taxa that are usually not found complete elsewhere, such as Tropidocoryphe , Cyphaspis and Dohmiella [ van Viersen, 2006b ]. Accumulation of small individuals occurs locally in the bed, with other macrofaunal elements. The R-uEf is dominated by Calycoscutellum...

.... ouarouroutensoides ssp. nov., Ouarourout II section, A2, MU-G-Sr.Tr.A2/Ph166: cephalon in dorsal view; (u) Phacops o. ouarouroutensoides ssp. nov., Ouarourout II section, A2, MU-G-Sr.Tr.A2/Ph163: thoracopygidium in dorsal view. (v–x) Cyphaspis sp. A Chatterton et al . ( 2006 ), Ouarourout II section, A4, MU-G...

... ), and Cyphaspis Burmeister, 1843 ( Adrain and Chatterton, 1996 ), along with papers describing species on a regional basis ( Adrain, 1996 ; Adrain and Edgecombe, 1996 ; Adrain and Kloc, 1997 ). Many aulacopleurid genera (including Aulacopleura , Harpidella , Maurotarion , and Otarion ) have Silurian...

... and thickness of their exoskeletons and became more effective at enrolling ( Gerastos , Austerops , Paralejurus ), with a variety of coaptative devices to stay enrolled, and yet others seemed to have evolved into forms that are a compromise between such extremes ( Cyphaspis , Hollardops , Lobopyge...

... ; Harpidella (s.l.) dolicocephala Ji, 1986 ; ? R. elongata Sun, 1990 ; Cyphaspis humillima Barrande, 1852 ; Proetus loredensis Delgado, 1908 ; Otarion simplex Kolobova, 1978 ; Radnoria simplex of Hammann and Leone ( 1997 ) (likely includes two distinct species, see the following remarks); R...

... I. wahwahensis , which bears an elongate spine during the meraspid period. The spine (as, for example, in the aulacopleurid Cyphaspis , see Adrain and Chatterton, 1995) is reduced in relative length through ontogeny, but is retained as a distinct node much later than in Dimeropygiella . It seems...

....  * Hormotoma subulata (Conrad)   Lophospira sp. PTEROPODA Tentaculites minutus Hall CEPHALOPODA   Michelinoceras multiseptum (Hall) TRILOBITA   Cyphaspis sp.   Dalmanitina sp.   Flexicalymene sp.   Proetus sp. OSTRACODA  * Leperditia cylindrica (Hall) CONULARIDA   Conularia cataractensis Ruedemann...

... trilobite Cyphaspis with new species from the Silurian of northwestern Canada : Journal of Paleontology , 70 . 100 – 110 . Adrain , J. M. , L. , and Ramsköld , 1996 , The lichid trilobite Radiolichas in the Silurian of Arctic Canada and Gotland, Sweden : Geological Magazine , 133...

... during ontogeny, but they remain as large tubercles among smaller background tubercles in Harpidella spinifrons. Juvenile cranidia of Cyphaspis lowei Adrain and Chatterton, 1996 , not only display paired glabellar tubercles (though only two main pairs) and fixigenal tubercle arcs, but they also have...