Corynexochida

Cheiruroides primigenius

Order Corynexochida / Suborder Corynexochina / Family Oryctocephalidae / Family Cheiruroidinae

Cambrian, Series 2, Stage 4Liaoning, Anhui, Hunan; Korea

Cheiruroides primigenius — photo 1 — Photo 1 · Type specimen (Korea; Kobayashi Reconstructions of the ontogenetic series et al., 1951) (Zhu Xuejian et al., 2004) Complete dorsal (Liaoning; Zhang et al., 1987) (Anhui; Qiu Hongan et al. shield (Anhui; 1983) Baishui) Complete Complete dorsal shield (Anhui; dorsal shield Qianli zhi Jiang) (Hunan; Baishui)

Cheiruroides primigenius — photo 2 — Photo 2 · Type specimen (Korea; Kobayashi Reconstructions of the ontogenetic series et al., 1951) (Zhu Xuejian et al., 2004) Complete dorsal (Liaoning; Zhang et al., 1987) (Anhui; Qiu Hongan et al. shield (Anhui; 1983) Baishui) Complete Complete dorsal shield (Anhui; dorsal shield Qianli zhi Jiang) (Hunan; Baishui)

Cheiruroides primigenius — photo 3 — Photo 3 · Type specimen (Korea; Kobayashi Reconstructions of the ontogenetic series et al., 1951) (Zhu Xuejian et al., 2004) Complete dorsal (Liaoning; Zhang et al., 1987) (Anhui; Qiu Hongan et al. shield (Anhui; 1983) Baishui) Complete Complete dorsal shield (Anhui; dorsal shield Qianli zhi Jiang) (Hunan; Baishui)

Cheiruroides primigenius — photo 4 — Photo 4 · Type specimen (Korea; Kobayashi Reconstructions of the ontogenetic series et al., 1951) (Zhu Xuejian et al., 2004) Complete dorsal (Liaoning; Zhang et al., 1987) (Anhui; Qiu Hongan et al. shield (Anhui; 1983) Baishui) Complete Complete dorsal shield (Anhui; dorsal shield Qianli zhi Jiang) (Hunan; Baishui)

Cheiruroides primigenius — photo 5 — Photo 5 · Type specimen (Korea; Kobayashi Reconstructions of the ontogenetic series et al., 1951) (Zhu Xuejian et al., 2004) Complete dorsal (Liaoning; Zhang et al., 1987) (Anhui; Qiu Hongan et al. shield (Anhui; 1983) Baishui) Complete Complete dorsal shield (Anhui; dorsal shield Qianli zhi Jiang) (Hunan; Baishui)

Cheiruroides primigenius — photo 6 — Photo 6 · Type specimen (Korea; Kobayashi Reconstructions of the ontogenetic series et al., 1951) (Zhu Xuejian et al., 2004) Complete dorsal (Liaoning; Zhang et al., 1987) (Anhui; Qiu Hongan et al. shield (Anhui; 1983) Baishui) Complete Complete dorsal shield (Anhui; dorsal shield Qianli zhi Jiang) (Hunan; Baishui)

Cheiruroides primigenius — photo 7 — Photo 7 · Type specimen (Korea; Kobayashi Reconstructions of the ontogenetic series et al., 1951) (Zhu Xuejian et al., 2004) Complete dorsal (Liaoning; Zhang et al., 1987) (Anhui; Qiu Hongan et al. shield (Anhui; 1983) Baishui) Complete Complete dorsal shield (Anhui; dorsal shield Qianli zhi Jiang) (Hunan; Baishui)

Cheiruroides primigenius — photo 8 — Photo 8 · Type specimen (Korea; Kobayashi Reconstructions of the ontogenetic series et al., 1951) (Zhu Xuejian et al., 2004) Complete dorsal (Liaoning; Zhang et al., 1987) (Anhui; Qiu Hongan et al. shield (Anhui; 1983) Baishui) Complete Complete dorsal shield (Anhui; dorsal shield Qianli zhi Jiang) (Hunan; Baishui)

Cheiruroides primigenius — photo 9 — Photo 9 · Type specimen (Korea; Kobayashi Reconstructions of the ontogenetic series et al., 1951) (Zhu Xuejian et al., 2004) Complete dorsal (Liaoning; Zhang et al., 1987) (Anhui; Qiu Hongan et al. shield (Anhui; 1983) Baishui) Complete Complete dorsal shield (Anhui; dorsal shield Qianli zhi Jiang) (Hunan; Baishui)

Cheiruroides primigenius — photo 10 — Photo 10 · Type specimen (Korea; Kobayashi Reconstructions of the ontogenetic series et al., 1951) (Zhu Xuejian et al., 2004) Complete dorsal (Liaoning; Zhang et al., 1987) (Anhui; Qiu Hongan et al. shield (Anhui; 1983) Baishui) Complete Complete dorsal shield (Anhui; dorsal shield Qianli zhi Jiang) (Hunan; Baishui)

Classification

Order Corynexochida / Suborder Corynexochina / Family Oryctocephalidae / Family Cheiruroidinae

Genus

Cheiruroides Kobayashi, 1935

Genus author

Kobayashi T.

Genus etymology

cheirur-, Cheirurus, a trilobite genus name; -oides, resembling, like

Species

C. primigenius (Saito, 1934)

Species author

Saito K.

Species etymology

primigenius, Latin, primitive, first

Age

Cambrian, Series 2, Stage 4

Distribution

Liaoning, Anhui, Hunan; Korea

Synonyms

Arthricocephalus?primigenius; Atops orientalis; Cheiruroides orientalis; C. huashanensis; C. eleicis Cheiruroides

Diagnosis

Small trilobite; adult dorsal shield elongate-elliptical. Cephalon semicircular; cranidium nearly trapezoidal; glabella long, rather strongly convex, reaching the anterior border, sides parallel or slightly expanding forward; with four Pairs of glabellar furrows, S1-S3 connected medially, S4 pit-like; Occipital furrow and ring both broad; Eye ridge indistinct; Palpebral lobe narrow, located at the anterior-middle part of the glabella; Ocular area of fixed cheek about pairs of glabellar furrows, S1-S3 connected medially, S4 pit-like; occipital furrow and ring both broad; eye ridge indistinct; palpebral lobe narrow, opposite the anterior half of the glabella; palpebral area of the fixed cheek about half as wide as the glabella; anterior border narrow and convex; anterior border furrow deep; posterior border furrow broad, deep and directed obliquely forward; posterior limb triangular; gonatoparian sutures; free cheek rather narrow, its outer border relatively broad and strongly raised, border furrow rather deep. Thorax of 15 segments; pleurae slightly wider than the axis, pleural furrows broad and deep. Pygidium extremely small, of a single segment. atively broad and strongly raised, border furrow rather deep. Thorax of 15 segments; pleurae slightly wider than the axis, pleural furrows broad and deep. Pygidium extremely small, of a single segment.

Remarks

This species is the type species of Cheiruroides.