Agnostida

Serrodiscus bellimarginatus

Order Agnostida / Suborder Eodiscina / Superfamily Eodiscoidea / Family Weymouthiidae

Cambrian, Series 2, Stage 4UK, Spain, Canada

Serrodiscus bellimarginatus — photo 1 — Photo 1 · Some type specimens originally Line drawing of Recons type specimen tructio assigned to E. (S.) serratus n (UK; Shaler 1888) (Spain; Collantes et al., 2022) (Collantes et al., 2022) UHU-CSB100 (Spain; left: Collantes et al., 2022; right: Collantes et al., 2020, display board) UHU-CSB101 (Spain; Collantes et al., 2022)

Serrodiscus bellimarginatus — photo 2 — Photo 2 · Some type specimens originally Line drawing of Recons type specimen tructio assigned to E. (S.) serratus n (UK; Shaler 1888) (Spain; Collantes et al., 2022) (Collantes et al., 2022) UHU-CSB100 (Spain; left: Collantes et al., 2022; right: Collantes et al., 2020, display board) UHU-CSB101 (Spain; Collantes et al., 2022)

Serrodiscus bellimarginatus — photo 3 — Photo 3 · Some type specimens originally Line drawing of Recons type specimen tructio assigned to E. (S.) serratus n (UK; Shaler 1888) (Spain; Collantes et al., 2022) (Collantes et al., 2022) UHU-CSB100 (Spain; left: Collantes et al., 2022; right: Collantes et al., 2020, display board) UHU-CSB101 (Spain; Collantes et al., 2022)

Serrodiscus bellimarginatus — photo 4 — Photo 4 · Some type specimens originally Line drawing of Recons type specimen tructio assigned to E. (S.) serratus n (UK; Shaler 1888) (Spain; Collantes et al., 2022) (Collantes et al., 2022) UHU-CSB100 (Spain; left: Collantes et al., 2022; right: Collantes et al., 2020, display board) UHU-CSB101 (Spain; Collantes et al., 2022)

Serrodiscus bellimarginatus — photo 5 — Photo 5 · Some type specimens originally Line drawing of Recons type specimen tructio assigned to E. (S.) serratus n (UK; Shaler 1888) (Spain; Collantes et al., 2022) (Collantes et al., 2022) UHU-CSB100 (Spain; left: Collantes et al., 2022; right: Collantes et al., 2020, display board) UHU-CSB101 (Spain; Collantes et al., 2022)

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. bellimarginatus (Shaler & Foerste in Shaler, 1888)

Species author

Shaler N. S. & Foerste A. F.

Species etymology

bell-, Latin, neat, beautiful; marginatus, bordered.

Age

Cambrian, Series 2, Stage 4

Distribution

UK, Spain, Canada

Synonyms

Microdiscus bellimarginatus; Eodiscus bellimarginatus; Eodiscus (Eodiscus) llarenai; Eodiscus (Serrodiscus) silesius; Eodiscus (Serrodiscus) bellimarginatus; Paradiscus (Serrodiscus) coloi; Serrodiscus silesius; Ladadiscus llarenai; Serrodiscus speciosus silesius; Eodiscus (Serrodiscus) serratus; Serrodiscus serratus; Serrodiscus coloi

Diagnosis

Cephalon semicircular-oval; border broad, with six to eight pairs of subequal nodes in large specimens; border furrow broad and deep; glabella subcylindrical to subconical, with three to four pairs of non-crossing glabellar furrows; occipital ring and genal angles with small spines. Thorax of three subequal segments. Pygidium subtriangular; pygidial axis conical, with nine rings plus a terminal segment, all but the terminal one with axial nodes; lateral margin with at least seven marginal spines.

Remarks

This species is the type species of Serrodiscus; the original type species Eodiscus (Serrodiscus) serratus is its junior synonym (Collantes et al., 2022).