Brachymetopus (Brachymetopus) ararat Engel & Morris 1992

Vanderlaan, Tegan A. & Ebach, Malte C., 2015, A review of the Carboniferous and Permian trilobites of Australia, Zootaxa 3926 (1), pp. 1-56 : 13-14

Brachymetopus (Brachymetopus) ararat Engel & Morris 1992

1992 Brachymetopus (Brachymetopus) maccoyi ararat Engel & Morris ; p. 80–82, pl. 2, figs. 1–7, text-figs. 5–7.

Holotype. AMF84320a (external mould of partial cephalon).

Paratype material. From NU L375: AMF84320b (internal cephalon), AMF84321a/b (external/internal cephalon), AMF84322a/b (external/internal pygidium), AMF84323 (external pygidium), AMF84324 (internal pygidium), AMF84325 (internal cephalon and pygidium), AMF84326 (external cephalon). From NU L740: AMF84327 (external cephalon), AMF84328 (external cephalon), AMF84329 (external pygidium), AMF84330 (internal pygidium), AMF84331 (external pygidium).

Locality. Type—NU L375. Other—NU L740.

Emended diagnosis. Cephalic and glabellar shape slightly triangular anteriorly; glabella under half cephalic length; eye length almost half glabellar length; cephalon inflated, preglabellar field steep (50–60°); strong flattened nodular ornament, tending to become obsolete on the occipital ring and posterior border; two large nodes in front of the eyes appear to constrict the glabella; single row of nodes around inner margin of the cephalic border. Pygidium with 11–15 axial rings, 7–8 pleural ribs; posterior ribs not incurved.

Remarks. The above diagnosis has been emended from Engel & Morris (1992) to remove some of the descriptive text of the nodular ornament. Brachymetopus (Brachymetopus) ararat is diagnosed as a separate species from Brachymetopus (Brachymetopus) maccoyi as it has a slightly triangular cephalon and two distinct nodes above the eyes, smaller eyes and sparser ornament.