Ceraurinella

Ceraurinella scofieldi, copyright Caleb.

Belongs within: Cheirurinae.

Ceraurinella is a genus of trilobites known from warm waters of the Middle (Llanvirn) to Late (Ashgill) Ordovician. Members of this genus have the ancestral unpaired medial spine of the pygidium fused with the terminal piece of the pygidial and displaced towards the anterior margin of the pygidium. The pygidium bears three pairs of spines, or two pairs with the median pair fused into a new unpaired terminal spine (Přibyl et al. 1985).

<==Ceraurinella Cooper 1953 PVP85
    |--C. (Ceraurinella) PVP85
    |    |--*C. (C.) typa Cooper 1953 PVP85
    |    |--C. (C.) angusta (Raymond 1925) PVP85
    |    |--C. (C.) buttsi Cooper 1953 PVP85
    |    |--C. (C.) chondra Whittington & Evitt 1954 PVP85
    |    |--C. (C.) dispersa (Tripp 1962) PVP85
    |    |--C. (C.) exornata (Lisogor 1965) PVP85
    |    |--C. (C.) kingstoni Chatterton & Ludvigsen 1976 PVP85
    |    |--C. (C.) latipyga Shaw 1968 PVP85
    |    |--C. (C.) longifrons (Troedsson 1929) PVP85
    |    |--C. (C.) magnilobata Tripp 1967 PVP85
    |    |--C. (C.) nahanniensis Chatterton & Ludvigsen 1976 PVP85
    |    |--C. (C.) ornata (Dalman 1828) PVP85
    |    |--C. (C.) pompilius (Billings 1865) PVP85
    |    |--C. (C.) seriata Ludvigsen 1979 PVP85
    |    |--C. (C.) tenuisculpta (Bradley 1930) PVP85
    |    `--C. (C.) trentonensis (Barton 1913) PVP85
    `--C. (Arcticeraurinella Přibyl & Vaněk in Přibyl, Vaněk & Pek 1985) PVP85
         |--C. (*A.) arctica Ludvigsen 1979 PVP85
         |--C. (A.) brevispina Ludvigsen 1979 PVP85
         |--C. (A.) longispina Ludvigsen 1979 PVP85
         |--C. (A.) media Ludvigsen 1979 PVP85
         |--C. (A.) necra Ludvigsen 1979 PVP85
         `--C. (A.) scofieldi (Clarke 1897) PVP85

*Type species of generic name indicated

REFERENCES

[PVP85] Přibyl, A., J. Vaněk & I. Pek. 1985. Phylogeny and taxonomy of family Cheiruridae (Trilobita). Acta Universitatis Palackianae Olomucensis Facultas Rerum Naturalium Geographica-Geologica XXIV 83: 107–193.