Corynexochida

Annamitella liexiensis

Order Corynexochida / Suborder Leiostegiina / Superfamily Leiostegioidea / Family Leiostegiidae

Tremadocian (Early Ordovician)Hunan

Annamitella liexiensis — photo 1 — Photo 1 · Type specimen (Hunan; Liu Yiren 1982) Complete dorsal exoskeleton Complete dorsal exoskeleton (Hunan; Chengbei Baigong) (Hunan; Dai Xu) Early holaspid specimen (Hunan; Complete dorsal exoskeleton Complete dorsal exoskeleton Baishui) (Hunan; Baishui) (Hunan; panda)

Annamitella liexiensis — photo 2 — Photo 2 · Type specimen (Hunan; Liu Yiren 1982) Complete dorsal exoskeleton Complete dorsal exoskeleton (Hunan; Chengbei Baigong) (Hunan; Dai Xu) Early holaspid specimen (Hunan; Complete dorsal exoskeleton Complete dorsal exoskeleton Baishui) (Hunan; Baishui) (Hunan; panda)

Annamitella liexiensis — photo 3 — Photo 3 · Type specimen (Hunan; Liu Yiren 1982) Complete dorsal exoskeleton Complete dorsal exoskeleton (Hunan; Chengbei Baigong) (Hunan; Dai Xu) Early holaspid specimen (Hunan; Complete dorsal exoskeleton Complete dorsal exoskeleton Baishui) (Hunan; Baishui) (Hunan; panda)

Annamitella liexiensis — photo 4 — Photo 4 · Type specimen (Hunan; Liu Yiren 1982) Complete dorsal exoskeleton Complete dorsal exoskeleton (Hunan; Chengbei Baigong) (Hunan; Dai Xu) Early holaspid specimen (Hunan; Complete dorsal exoskeleton Complete dorsal exoskeleton Baishui) (Hunan; Baishui) (Hunan; panda)

Annamitella liexiensis — photo 5 — Photo 5 · Type specimen (Hunan; Liu Yiren 1982) Complete dorsal exoskeleton Complete dorsal exoskeleton (Hunan; Chengbei Baigong) (Hunan; Dai Xu) Early holaspid specimen (Hunan; Complete dorsal exoskeleton Complete dorsal exoskeleton Baishui) (Hunan; Baishui) (Hunan; panda)

Annamitella liexiensis — photo 6 — Photo 6 · Type specimen (Hunan; Liu Yiren 1982) Complete dorsal exoskeleton Complete dorsal exoskeleton (Hunan; Chengbei Baigong) (Hunan; Dai Xu) Early holaspid specimen (Hunan; Complete dorsal exoskeleton Complete dorsal exoskeleton Baishui) (Hunan; Baishui) (Hunan; panda)

Classification

Order Corynexochida / Suborder Leiostegiina / Superfamily Leiostegioidea / Family Leiostegiidae

Genus

Annamitella Mansuy, 1920

Genus author

Mansuy H.

Genus etymology

Annan, Annam, the old name of Vietnam; -ella, a diminutive adjectival suffix

Species

A. liexiensis Liu, 1982

Species author

Liu Yiren

Species etymology

Liexi, Liexi, Yongshun, Hunan, the locality

Age

Tremadocian (Early Ordovician)

Distribution

Hunan

Diagnosis

Dorsal shield elongate-elliptical, covered with tubercles. Cephalon semicircular; glabella subrectangular, constricted medially, with three pairs of glabellar furrows; occipital furrow wide and shallow, occipital ring convex, of uniform width; fixigenae narrow, palpebral lobes arcuate and rather long; librigenae wide and convex with wide border and border furrow, genal spines stout and sharp. Thorax of 10 segments; axis convex, tapering gradually backward; pleurae flat with short pleural spines. Pygidium convex, semicircular; axis tapering gradually with rounded end, with 7-8 axial rings and a terminal piece; pleural region sloping toward the border, divided into 6 pleural segments with narrow shallow pleural furrows; border low and flat, border furrow indistinct.