Asaphida

Jegorovaia convexa

Order Asaphida / Superfamily Trinucleoidea / Family Alsataspididae

Jiangshanian to Stage 10 (Furongian, Cambrian)Guizhou, Hunan, Zhejiang

Jegorovaia convexa — photo 1 — Photo 1 · and western Hunan in the late 1950s Holotype NIGP 23731, reversed image of the external mould (Guizhou; (Guizhou; Peng 2020) Peng 2020) (Zhejiang; StrongZJU) External mould specimen on the same slab as Asiocephalus sulcatus (Zhejiang; Baishui)

Jegorovaia convexa — photo 2 — Photo 2 · and western Hunan in the late 1950s Holotype NIGP 23731, reversed image of the external mould (Guizhou; (Guizhou; Peng 2020) Peng 2020) (Zhejiang; StrongZJU) External mould specimen on the same slab as Asiocephalus sulcatus (Zhejiang; Baishui)

Jegorovaia convexa — photo 3 — Photo 3 · and western Hunan in the late 1950s Holotype NIGP 23731, reversed image of the external mould (Guizhou; (Guizhou; Peng 2020) Peng 2020) (Zhejiang; StrongZJU) External mould specimen on the same slab as Asiocephalus sulcatus (Zhejiang; Baishui)

Jegorovaia convexa — photo 4 — Photo 4 · and western Hunan in the late 1950s Holotype NIGP 23731, reversed image of the external mould (Guizhou; (Guizhou; Peng 2020) Peng 2020) (Zhejiang; StrongZJU) External mould specimen on the same slab as Asiocephalus sulcatus (Zhejiang; Baishui)

Classification

Order Asaphida / Superfamily Trinucleoidea / Family Alsataspididae

Genus

Jegorovaia Lu in Lu & Chien, 1964

Genus author

Lu Yanhao

Genus etymology

Jegorova, the Soviet palaeontologist L. I. Jegorova, who took part in palaeontological expeditions in Guizhou

Species

J. convexa Lu & Qian in Lu et al., 1974

Species author

Lu Yanhao, Qian Yiyuan

Species etymology

convexa, Latin, convex

Age

Jiangshanian to Stage 10 (Furongian, Cambrian)

Distribution

Guizhou, Hunan, Zhejiang

Diagnosis

Glabella sub-inverted-pear-shaped with rounded front and 3 pairs of short glabellar furrows; occipital ring with a median node; palpebral lobes small, positioned in front of and away from the glabella; eye ridges long, extending obliquely outward-forward; anterior border convex, a wide longitudinal ridge on the sagittal line of the preglabellar field extending to the anterior glabellar lobe; fixigenae wide and large posteriorly, genal margins arched in a ridge-like curve; librigenae extremely narrow, extended backward into long genal spines. Thorax of 13 segments, whole slightly subtriangular; axis narrow; pleurae rather straight with wide deep pleural furrows. Pygidium small, transversely triangular.