Sphaerexochus

Figure of Sphaerexochus mirus from Congreve & Lieberman (2011): 1, dorsal view; 2, lateral view; 3, pygidium; 4, hypostome.

Belongs within: Sphaerexochinae.

Sphaerexochus is a cosmopolitan genus of trilobites known from the Middle Ordovician to the Late Silurian (Přibyl et al. 1985).

See also: Sphaerexochus: a possibly predatory trilobite.

Characters (from Přibyl et al. 1985): Glabella arched into a spherical shape, lateral glabellar furrows 3S and 2S shortened; lobe 1L limited to terminal margins of glabella. Hypostome with deep notch at posterior border. Pygidium with 3(+1) axial rings and three pairs of pleurae; pleurae narrow, lathy.

<==Sphaerexochus Beyrich 1945 PVP85
    |--+--S. (Sphaerexochus) PVP85
    |  |    |--*S. (S.) mirus Beyrich 1845 PVP85
    |  |    |--S. (S.) bohemicus Barrande 1872 PVP85
    |  |    |--S. (S.) bradleyi Chatterton & Perry 1984 PVP85
    |  |    |--S. (S.) bridgei Cooper & Kindle 1936 PVP85
    |  |    |--S. (S.) calvus McCoy 1846 PVP85
    |  |    |--S. (S.) centeo Lane & Owens 1982 PVP85
    |  |    |--S. (S.) costabilis Dean 1971 PVP85
    |  |    |--S. (S.) dimorphus Perry & Chatterton 1977 PVP85
    |  |    |--S. (S.) discrepans Raymond 1925 PVP85
    |  |    |--S. (S.) eurys Tripp 1962 PVP85
    |  |    |--S. (S.) glaber Holloway 1980 PVP85
    |  |    |--S. (S.) guizhouensis Wu 1977 PVP85
    |  |    |--S. (S.) hiratai Kobayashi & Hamada 1974 PVP85
    |  |    |--S. (S.) johnstoni Chatterton & Perry 1984 PVP85
    |  |    |--S. (S.) laciniatus Lindström 1885 PVP85
    |  |    |--S. (S.) latens Barrande 1872 PVP85
    |  |    |--S. (S.) latifrons Angelin 1854 PVP85
    |  |    |--S. (S.) lorum Chatterton & Campbell 1980 PVP85
    |  |    |--S. (S.) molongloensis Chatterton & Campbell 1980 PVP85
    |  |    |--S. (S.) orientalis Kobayashi & Hamada 1970 PVP85
    |  |    |--S. (S.) paramirus Šnajdr 1980 PVP85
    |  |    |--S. (S.) planirachis Kobayashi & Hamada 1974 PVP85
    |  |    |--S. (S.) romingeri Hall 1868 PVP85
    |  |    `--S. (S.) scabridus Angelin 1854 PVP85
    |  `--S. (Onukia Kobayashi & Hamada 1976) PVP85
    |       `--S. (*O.) sugyiamai Kobayashi & Hamada 1976 PVP85
    |--S. (Korolevium Přibyl & Vaněk in Přibyl, Vaněk & Pek 1985) PVP85
    |    |--S. (*K.) arenosus Chatterton & Ludvigsen 1976 PVP85
    |    |--S. (K.) arcuatus Tripp 1976 PVP85
    |    |--S. (K.) atacius Ludvigsen 1979 PVP85
    |    |--S. (K.) balclatchiensis Reed 1924 PVP85
    |    |--S. (K.) bilobatus Whittard 1958 PVP85
    |    |--S. (K.) conusoides Koroleva 1959 PVP85
    |    |--S. (K.) filius Tripp 1967 PVP85
    |    |--S. (K.) hapsidotus Whittington & Evitt 1954 PVP85
    |    |--S. (K.) hisingeri Warburg 1925 PVP85
    |    |--S. (K.) pulcher Whittington & Evitt 1954 PVP85
    |    `--S. (K.) tuberculatus Warburg 1925 PVP85
    `--S. (Parvixochus Přibyl & Vaněk in Přibyl, Vaněk & Pek 1985) PVP85
         `--S. (*P.) parvus Billings 1863 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.