Asaphida

Ampyx abnormalis

Order Asaphida / Superfamily Trinucleoidea / Family Raphiophoridae

Darriwilian (Middle Ordovician) to Sandbian (LateHubei, Guizhou

Ampyx abnormalis — photo 1 — Photo 1 · Type specimens, 3c is the holotype (Hubei; Yi Yong'en 1957) (Guizhou; Zhou et al., 1984) (Guizhou; Yin Gongzheng et al. 1978)

Ampyx abnormalis — photo 2 — Photo 2 · Type specimens, 3c is the holotype (Hubei; Yi Yong'en 1957) (Guizhou; Zhou et al., 1984) (Guizhou; Yin Gongzheng et al. 1978)

Ampyx abnormalis — photo 3 — Photo 3 · Type specimens, 3c is the holotype (Hubei; Yi Yong'en 1957) (Guizhou; Zhou et al., 1984) (Guizhou; Yin Gongzheng et al. 1978)

Classification

Order Asaphida / Superfamily Trinucleoidea / Family Raphiophoridae

Genus

Ampyx Dalman, 1827

Genus author

Dalman J. W.

Genus etymology

ampyx, a headband, a round object

Species

A. abnormalis Yi, 1957

Species author

Yi Yong'en

Species etymology

abnormis, abnormal, unusual

Age

Darriwilian (Middle Ordovician) to Sandbian (Late

Distribution

Hubei, Guizhou

Synonyms

Ordovician) Ampyx abnormis

Diagnosis

Cranidium nearly equilateral triangular; glabella pear-shaped, expanding anteriorly with bluntly rounded front, posterior constricted part with two pairs of oblique glabellar furrows; glabella extended forward into a long spine of circular cross-section; occipital furrow of uniform width; librigenal genal spines longer than the body width. Thorax of 6 segments; axis slightly narrow; pleurae straight. Pygidium rounded-triangular; axis conical, reaching the border.