|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 mm) glabella with commonly an undefined pattern of tubercle distribution to one in which two ill-defined exsagittal rows of 5-6 coarser tubercles can be recognized, an occipital node, and glabellar furrows equally incised, essentially transverse; largest specimens have fewer smaller glabellar tubercles; maximum width of glabella across posterior part of frontal lobe, only slightly greater than across L3; frontal glabellar lobe laterallys teeplys loping,a nd even overhanginga xial furrow on inner molds; center (exsag.) of palpebral lobe opposite (tr.) L3 and S2; lateralb orderf urrowt urningt ransverselya t anterior end, joining S3; eye ridge absent to ill developed, low, and forming part of posterior slope of proximal part of transverse prolongation of lateral border near S3; distal part of eye ridge near eye unknown (or possibly not developed); fixigenae reticulate and with small tubercles, notably near posterior border furrow, and two large tubercles disposed exsagittally between eye and glabella aligning themselves with a third tubercle on posterior border; anterior border visible dorsally, one-third to one-half as long (sag.) as occipital ring, smooth or bituberculate with scarce tubercles. Hypostoma maculate, equally wide as long, with a steeply sloping (not vertical) anterior border and a slightly dorsally deflected posterior border. Pygidium with small projections between the great spines, posterior margin triangular; axial furrows between axis and pleural ribs or spines obsolete.|