Agnostida

Tomagnostella orientalis

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Ptychagnostidae

Cambrian, Furongian Paibian to JiangshanianZhejiang; Sweden, Korea, Siberia

Tomagnostella orientalis — photo 1 — Photo 1 · Cephalon holotype (Siberia; Naimark (Sweden; Ahlberg et al., 2012) (Korea; Choi et al., 2004) et al., 2017) (Zhejiang; Peng Shanchi et al. (Zhejiang; (Zhejiang; Baishui) 2016) Guodong)

Tomagnostella orientalis — photo 2 — Photo 2 · Cephalon holotype (Siberia; Naimark (Sweden; Ahlberg et al., 2012) (Korea; Choi et al., 2004) et al., 2017) (Zhejiang; Peng Shanchi et al. (Zhejiang; (Zhejiang; Baishui) 2016) Guodong)

Tomagnostella orientalis — photo 3 — Photo 3 · Cephalon holotype (Siberia; Naimark (Sweden; Ahlberg et al., 2012) (Korea; Choi et al., 2004) et al., 2017) (Zhejiang; Peng Shanchi et al. (Zhejiang; (Zhejiang; Baishui) 2016) Guodong)

Tomagnostella orientalis — photo 4 — Photo 4 · Cephalon holotype (Siberia; Naimark (Sweden; Ahlberg et al., 2012) (Korea; Choi et al., 2004) et al., 2017) (Zhejiang; Peng Shanchi et al. (Zhejiang; (Zhejiang; Baishui) 2016) Guodong)

Tomagnostella orientalis — photo 5 — Photo 5 · Cephalon holotype (Siberia; Naimark (Sweden; Ahlberg et al., 2012) (Korea; Choi et al., 2004) et al., 2017) (Zhejiang; Peng Shanchi et al. (Zhejiang; (Zhejiang; Baishui) 2016) Guodong)

Tomagnostella orientalis — photo 6 — Photo 6 · Cephalon holotype (Siberia; Naimark (Sweden; Ahlberg et al., 2012) (Korea; Choi et al., 2004) et al., 2017) (Zhejiang; Peng Shanchi et al. (Zhejiang; (Zhejiang; Baishui) 2016) Guodong)

Classification

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Ptychagnostidae

Genus

Tomagnostella Kobayashi, 1939

Genus author

Kobayashi T.

Genus etymology

Tomagnostus, a trilobite genus name; -ella, diminutive suffix.

Species

T. orientalis (Lazarenko, 1966)

Species author

Lazarenko N. P.

Species etymology

orientalis, Latin, eastern.

Age

Cambrian, Furongian Paibian to Jiangshanian

Distribution

Zhejiang; Sweden, Korea, Siberia

Synonyms

Cyclopagnostus orientalis; Peratagnostus hillardensis; Peratagnostus orientalis; Peratagnostus distinctus Peratagnostus zhejiangensis; Peratagnostus falanensis

Diagnosis

Cephalon and pygidium nearly round, surface smooth. Glabella obscure, without frontal lobe; cheek with radiating furrows or none; basal lobe small or indistinct. Pygidial axis obscure, inverted triangular-conical, Terminal end far from posterior border furrow; No postaxial median furrow; No posterolateral marginal spines.

Remarks

Typical body length about 0.2-1 cm.