Asaphida

Lonchodomas shanensis

Order Asaphida / Superfamily Trinucleoidea / Family Raphiophoridae

Katian (Late Ordovician)Yunnan; Myanmar

Lonchodomas shanensis — photo 1 — Photo 1 · Lectotype GSI 11504 (Myanmar; Fortey et al., 2022) (Yunnan; Qianli Zhijiang) (Yunnan; Tuyang Tuseng Po) (Yunnan; Lixia) (Yunnan; Weidingzhong Guchong)

Lonchodomas shanensis — photo 2 — Photo 2 · Lectotype GSI 11504 (Myanmar; Fortey et al., 2022) (Yunnan; Qianli Zhijiang) (Yunnan; Tuyang Tuseng Po) (Yunnan; Lixia) (Yunnan; Weidingzhong Guchong)

Lonchodomas shanensis — photo 3 — Photo 3 · Lectotype GSI 11504 (Myanmar; Fortey et al., 2022) (Yunnan; Qianli Zhijiang) (Yunnan; Tuyang Tuseng Po) (Yunnan; Lixia) (Yunnan; Weidingzhong Guchong)

Lonchodomas shanensis — photo 4 — Photo 4 · Lectotype GSI 11504 (Myanmar; Fortey et al., 2022) (Yunnan; Qianli Zhijiang) (Yunnan; Tuyang Tuseng Po) (Yunnan; Lixia) (Yunnan; Weidingzhong Guchong)

Lonchodomas shanensis — photo 5 — Photo 5 · Lectotype GSI 11504 (Myanmar; Fortey et al., 2022) (Yunnan; Qianli Zhijiang) (Yunnan; Tuyang Tuseng Po) (Yunnan; Lixia) (Yunnan; Weidingzhong Guchong)

Lonchodomas shanensis — photo 6 — Photo 6 · Lectotype GSI 11504 (Myanmar; Fortey et al., 2022) (Yunnan; Qianli Zhijiang) (Yunnan; Tuyang Tuseng Po) (Yunnan; Lixia) (Yunnan; Weidingzhong Guchong)

Classification

Order Asaphida / Superfamily Trinucleoidea / Family Raphiophoridae

Genus

Lonchodomas Angelin, 1854

Genus author

Angelin N. P.

Genus etymology

lonch-, Greek, lance, spear

Species

L. shanensis (Reed, 1915)

Species author

Reed F. R. C.

Species etymology

Shan State, Myanmar

Age

Katian (Late Ordovician)

Distribution

Yunnan; Myanmar

Synonyms

Ampyx rostratus var. shanensis

Diagnosis

Glabella narrow and elongate, rhomboidal, a median ridge running along the anterior half of the glabella and extending forward into a stout long spine; librigenal genal spines up to twice the length of the thorax and pygidium. Thorax of 6 segments; axis subequal in width to pleurae; pleurae straight. Pygidium wide, slightly triangular; axis inverted-triangular, stout and distinct; pleural region with two pleural furrows; border steeply deflected downward.