Trilobita - Phacopida - Phacopidae

Alternative combination: Pterygometopus annulatus

Synonyms: Calliops strasburgensis Ulrich and Delo 1940, Pterygometopus gracilens Raymond 1925

Belongs to Calyptaulax according to F.C. Shaw 1968

Sister taxa: Calyptaulax callicephala, Calyptaulax callirachis, Calyptaulax cornwalli, Calyptaulax holstonensis, Calyptaulax incepta, Calyptaulax sillimani, Calliops brevis, Calliops buttsi, Calliops angusta, Calliops mesleri, Calliops brevipostica, Calliops troosti

Type specimens:

• Calyptaulax annulata: Carnegie Mus1384 (lectotype), a cephalon/head (cranidium).
• Calliops strasburgensis:
• Pterygometopus gracilens:

Ecology: fast-moving low-level epifaunal carnivore