Asaphida

Lonchodomas yohi

Order Asaphida / Superfamily Trinucleoidea / Family Raphiophoridae

Darriwilian (Middle Ordovician) to Sandbian (Late Ordovician)Guizhou, Hubei

Lonchodomas yohi — photo 1 — Photo 1 · (Guizhou; Lu Yanhao et al. 1965) Holotype (Guizhou; Lu Yanhao et al. 1965) (Guizhou; Lu Yanhao et al. 1965) (Guizhou; Zhou et al., 1984) (Guizhou; Zhou et al., 1984) (Guizhou; Lixia)

Lonchodomas yohi — photo 2 — Photo 2 · (Guizhou; Lu Yanhao et al. 1965) Holotype (Guizhou; Lu Yanhao et al. 1965) (Guizhou; Lu Yanhao et al. 1965) (Guizhou; Zhou et al., 1984) (Guizhou; Zhou et al., 1984) (Guizhou; Lixia)

Lonchodomas yohi — photo 3 — Photo 3 · (Guizhou; Lu Yanhao et al. 1965) Holotype (Guizhou; Lu Yanhao et al. 1965) (Guizhou; Lu Yanhao et al. 1965) (Guizhou; Zhou et al., 1984) (Guizhou; Zhou et al., 1984) (Guizhou; Lixia)

Lonchodomas yohi — photo 4 — Photo 4 · (Guizhou; Lu Yanhao et al. 1965) Holotype (Guizhou; Lu Yanhao et al. 1965) (Guizhou; Lu Yanhao et al. 1965) (Guizhou; Zhou et al., 1984) (Guizhou; Zhou et al., 1984) (Guizhou; Lixia)

Lonchodomas yohi — photo 5 — Photo 5 · (Guizhou; Lu Yanhao et al. 1965) Holotype (Guizhou; Lu Yanhao et al. 1965) (Guizhou; Lu Yanhao et al. 1965) (Guizhou; Zhou et al., 1984) (Guizhou; Zhou et al., 1984) (Guizhou; Lixia)

Lonchodomas yohi — photo 6 — Photo 6 · (Guizhou; Lu Yanhao et al. 1965) Holotype (Guizhou; Lu Yanhao et al. 1965) (Guizhou; Lu Yanhao et al. 1965) (Guizhou; Zhou et al., 1984) (Guizhou; Zhou et al., 1984) (Guizhou; Lixia)

Classification

Order Asaphida / Superfamily Trinucleoidea / Family Raphiophoridae

Genus

Lonchodomas Angelin, 1854

Genus author

Angelin N. P.

Genus etymology

lonch-, Greek, lance, spear

Species

L. yohi (Sun, 1931)

Species author

Sun Yunchu

Species etymology

Yoh, a surname, in honour of Mr. Le Senxun (Yoh S. S.), the renowned Chinese geologist and palaeontologist who collected the specimens

Age

Darriwilian (Middle Ordovician) to Sandbian (Late Ordovician)

Distribution

Guizhou, Hubei

Synonyms

Ampyx yohi

Diagnosis

Cephalon nearly equilateral triangular in outline; glabella spearhead-shaped with 4 pairs of distinct muscle scars, median ridge extended into an anterior spine more than twice the cephalic length, rhomboidal in cross-section; librigenal genal spines extremely long, up to 3 times the body length. Thorax of 5 segments, axis subequal in width to pleurae; pleurae straight with deep pleural furrows and flat ends. Pygidium semi-elliptical, wider than long; border strongly deflected downward.