Belongs within: Pilekiinae.
Contains: Pseudosphaerexochus.
The Cyrtometopinae are a group of epifaunal benthic trilobites known from the Ordovician. Members of this group had pleurae bearing longitudinal rows of pits; Přibyl et al. (1985) stated that the Cyrtometopinae was otherwise supported by features of the "shape of cephalon, thoracic segments and hypostomes", but did not elaborate further.
<==Cyrtometopinae [Cyrtometopidae]
|--+--Pseudosphaerexochus PVP85
| |--Skelipyx Lane 1971 PVP85
| | `--*S. cancrura (Salter 1853) PVP85
| `--Stubblefieldia Prantl & Přibyl 1947 PVP85
| |--*S. neglecta (Barrande 1852) PVP85
| |--S. boops (Salter 1864) PVP85
| |--S. ekphyma (Lane 1971) PVP85
| |--S. juvenis (Salter 1848) PVP85
| `--S. pahnschi (Schmidt 1881) PVP85
|--+--Courtessolium Přibyl & Vaněk in Přibyl, Vaněk & Pek 1985 PVP85
| | `--*C. prepater (Courtessole & Pillet 1975) [=Pseudosphaerexochus (Pateraspis) prepater] PVP85
| `--+--Bornholmaspis Přibyl & Vaněk in Přibyl, Vaněk & Pek 1985 PVP85
| | |--*B. inflata (Poulsen 1965) [=Pseudosphaerexochus (Pateraspis) inflatus] PVP85
| | `--B. praecursor (Régnell 1940) PVP85
| `--Pateraspis Prantl & Přibyl 1947 PVP85
| |--*P. pater (Barrande 1872) PVP85
| |--P. andegava (Bureau 1900) PVP85
| |--P. lisogorae Přibyl, Vaněk & Pek 1985 [=Cheirurus radiatus Lisogor 1954 non Barrande 1846] PVP85
| |--P. mediterranea (Hammann 1972) PVP85
| `--P. parifin Šnajdr 1983 PVP85
|--+--Valongia Přibyl & Vaněk 1984 PVP85
| | `--*V. wattisoni (Curtis 1961) PVP85
| `--Actinopeltis Hawle & Corda 1847 PVP85
| |--*A. carolialexandri Hawle & Corda 1847 PVP85
| |--A. barrandei Kielan 1960 PVP85
| |--A. completa (Barrande 1872) PVP85
| |--A. dissimilis Petrunina 1975 PVP85
| |--A. globosa (Barrande 1846) [incl. Cheirurus radiatus Barrande 1846] PVP85
| |--A. insocialis (Barrande 1852) PVP85
| |--A. rivanoi Šnajdr 1982 PVP85
| |--A. spjeldnaesi Hammann 1972 PVP85
| `--A. vercingetorix Přibyl & Vaněk 1969 PVP85
`--+--Ancyginaspis Přibyl & Vaněk in Přibyl, Vaněk & Pek 1985 PVP85
| |--*A. prisca (Tjernvik 1956) [=Cyrtometopus priscus] PVP85
| `--A. ancygini Přibyl & Vaněk in Přibyl, Vaněk & Pek 1985 PVP85
`--+--Cyrtometopus Angelin 1854 PVP85
| |--*C. clavifrons (Dalman 1827) PVP85
| `--C. affinis Angelin 1854 PVP85
|--Reraspis Öpik 1937 PVP85
| |--*R. plautini (Schmidt 1881) PVP85
| `--R. elatifrons (Krause 1894) PVP85
`--+--Zazvorkaspis Přibyl & Vaněk 1964 PVP85
| |--*Z. neutra (Barrande 1872) PVP85
| `--Z. decorata Petrunina 1975 PVP85
`--Cyrtometopella Nikolaisen 1961 PVP85
|--*C. tumula Nikolaisen 1961 PVP85
|--C. aries (Eichwald 1843) PVP85
|--C. askerensis Nikolaisen 1961 PVP85
|--C. kaljoi (Männil 1958) PVP85
|--C. rosenthali (Schmidt 1881) PVP85
`--C. sulcata (Thorslund 1940) 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.
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