|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Trilobita - Phacopida - Cheiruridae
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|P. J. Lespérance and D. Desbiens 1995||A species of Ceraurus with bituberculate (tubercles of 0.3 and 0.6-1.0 mm) glabella with almost always a pattern of tubercle distribution of two exsagittal rows of 5-6 coarser tubercles, occipital node minute, present only in a few individuals, and essentially transverse S2 and S3 glabellar furrows, S2 shallower; some individuals without smaller glabellar tubercles and others with tubercle on each glabellar lobe; maximum width of glabella across posterior part of frontal lobe; frontal glabellar lobe laterallys lopinga t 45?-60?;c enter( exsag.)o fpalpebrall obes commonly opposite (tr.) L3, rarely S2; lateral border furrow turning transversely and slightly posteriorly at its anterior end, joining S3; eye ridges immediately posterior of transverse part of lateral border furrow, essentially transverse to S3, a few individuals have eye ridges slightly anteriorly directed proximally; fixigenae reticulate and with few small or large tubercles, and two large tubercles disposed exsagittally between eye and glabella, in line with third tubercle on posterior border; anterior border not visible to visible dorsally, pustulose and bituberculate with scarce tubercles. Maculae on hypostoma faintly present in a few individuals; hypostoma much wider than long (as 3:2), without anterior border in central half and slightly dorsally upturned posterior border. Missing hypostomal anterior border slightly more than half as wide as anterior lobe of hypostoma. Rostral plate as wide as anterior lobe of hypostoma. Cephalic doublure pustulose. Thorax with two tubercles on each axial ring. Pygidium with triangular posterior margin; axial furrows between axis and pleural ribs or spines obsolete to faint.|