Belongs within: Sphaerexochinae.
Heliomera is a genus of trilobites known from warm-water palaeozooprovinces of the Ordovician of Eurasia and North America (Přibyl et al. 1985).
Characters (from Přibyl et al. 1985): Genae reduced in size; eyes shifted towards external borders of cephalon; genal spines present; pygidium with two axial rings and two pairs of pleurae.
<==Heliomera Raymond 1905PVP85 |--H. (Heliomera)PVP85 | |--*H. (H.) sol (Billings 1865)PVP85 | `--H. (H.) albata Whittington 1963PVP85 `--H. (Heliomeroides Evitt 1951)PVP85 |--H. (*H.) teres Evitt 1951PVP85 |--H. (H.) akocephala (Shaw 1968)PVP85 |--H. (H.) alacer (Whittington 1963)PVP85 |--H. (H.) chipperfieldi (Tripp 1967)PVP85 |--H. (H.) freschaufae (Chatterton 1980)PVP85 |--H. (H.) novissima Dean 1971PVP85 |--H. (H.) raymondi Bradley 1930PVP85 `--H. (H.) treta (Evitt 1951)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.
Raymond, P. E. 1910. Notes on Ordovician trilobites, IV. New and old species from the Chazy. Annals of the Carnegie Museum 7: 60–80.