Pseudosphaerexochus hemicranium, from here.

Belongs within: Cyrtometopinae.

Pseudosphaerexochus is a genus of trilobites known from warm-water deposits of the Middle and Late Ordovician of Eurasia (Přibyl et al. 1985).

Characters (from Přibyl et al. 1985): Glabella greatly vaulted. Pygidium with 3(+1) axial rings and four pairs of pygidial pleurae, elongated into spines of varying lengths.

<==Pseudosphaerexochus Schmidt 1881PVP85
    |--*P. hemicranium (Kutorga 1854)PVP85
    |--P. approximatus (Eichwald 1860)PVP85
    |--P. bocagei (Delgado 1897)PVP85
    |--P. bulbosus Nikolaisen 1965PVP85
    |--P. conformis (Angelin 1854)PVP85
    |    |--P. c. conformisPVP85
    |    `--P. c. major Warburg 1925PVP85
    |--P. densigranulatus Nikolaisen 1965PVP85
    |--P. elongatus Thorslund 1940PVP85
    |--P. granulatus (Angelin 1854)PVP85
    |--P. laticeps (Linnarsson 1866)PVP85
    |--P. latilobus (Linnarsson 1866)PVP85
    |--P. neglectus Kummerow 1928PVP85
    |--P. octolobatus (McCoy 1849)PVP85
    |--P. ornatus (Ancygin 1977)PVP85
    |--P. orvikui Männil 1958PVP85
    |--P. pectinifer (Barrande 1872)PVP85
    |--P. platycranium (Kutorga 1854)PVP85
    |--P. ravni Olin 1906PVP85
    |--P. roemeri Schmidt 1881PVP85
    |--P. tectus Ingham 1974PVP85
    |--P. tenuispinus (Törnquist 1884)PVP85
    |--P. tumefectus Ancygin 1977PVP85
    |--P. tvaerensis Thorslund 1940PVP85
    |--P. warburgae Koroleva 1959PVP85
    `--P. wolkae Kielan 1960PVP85

*Type species of generic name indicated


[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.

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