Agnostida

Serrodiscus speciosus

Order Agnostida / Suborder Eodiscina / Superfamily Eodiscoidea / Family Weymouthiidae

Cambrian, Series 2, Stage 3 to Stage 4USA

Serrodiscus speciosus — photo 1 — Photo 1 · Plastotype specimen USNM 17478 (USA; SNMNH) Reconstruction (Collantes et al., 2022) USNM 156592 (USA; left: part and counterpart, SNMNH; right: Whiteley et al., 2002)

Serrodiscus speciosus — photo 2 — Photo 2 · Plastotype specimen USNM 17478 (USA; SNMNH) Reconstruction (Collantes et al., 2022) USNM 156592 (USA; left: part and counterpart, SNMNH; right: Whiteley et al., 2002)

Serrodiscus speciosus — photo 3 — Photo 3 · Plastotype specimen USNM 17478 (USA; SNMNH) Reconstruction (Collantes et al., 2022) USNM 156592 (USA; left: part and counterpart, SNMNH; right: Whiteley et al., 2002)

Serrodiscus speciosus — photo 4 — Photo 4 · Plastotype specimen USNM 17478 (USA; SNMNH) Reconstruction (Collantes et al., 2022) USNM 156592 (USA; left: part and counterpart, SNMNH; right: Whiteley et al., 2002)

Classification

Order Agnostida / Suborder Eodiscina / Superfamily Eodiscoidea / Family Weymouthiidae

Genus

Serrodiscus Richter & Richter, 1941

Genus author

Richter R. & Richter E.

Genus etymology

serr-, Latin, saw; Discus, disc.

Species

S. speciosus (Ford, 1873)

Species author

Ford S. W.

Species etymology

speciosus, Latin, beautiful, splendid.

Age

Cambrian, Series 2, Stage 3 to Stage 4

Distribution

USA

Synonyms

Microdiscus speciosus

Diagnosis

Compared with the type species, there is no occipital spine, the genal angle spines are smaller, and neither the thoracic axis nor the pygidial axis has axial nodes.