Phacopida

Mucronaspis (Songxites) mucronata

Order Phacopida / Suborder Phacopina / Superfamily Dalmanitoidea / Family Dalmanitidae

Hirnantian (Late Ordovician)Zhejiang, Guizhou, Sichuan, etc.; Sweden, UK, Canada
Mucronaspis (Songxites) mucronata — photo 1
Photo 1 · mucron-, Latin, tip, point; aspis, Greek, shield; songxi, Songxi, Wuning, Jiangxi Type specimen figures (A lectotype, B paralectotype; Sweden; Owen 1981) Cranidium, hypostome and pygidium figures (Zhejiang; Zhou et al., 2011) Left: nearly complete dorsal exoskeleton (Zhejiang; Zhou et al., 2011); right: the left image after mirror-symmetry processing
Mucronaspis (Songxites) mucronata — photo 2
Photo 2 · mucron-, Latin, tip, point; aspis, Greek, shield; songxi, Songxi, Wuning, Jiangxi Type specimen figures (A lectotype, B paralectotype; Sweden; Owen 1981) Cranidium, hypostome and pygidium figures (Zhejiang; Zhou et al., 2011) Left: nearly complete dorsal exoskeleton (Zhejiang; Zhou et al., 2011); right: the left image after mirror-symmetry processing
Mucronaspis (Songxites) mucronata — photo 3
Photo 3 · mucron-, Latin, tip, point; aspis, Greek, shield; songxi, Songxi, Wuning, Jiangxi Type specimen figures (A lectotype, B paralectotype; Sweden; Owen 1981) Cranidium, hypostome and pygidium figures (Zhejiang; Zhou et al., 2011) Left: nearly complete dorsal exoskeleton (Zhejiang; Zhou et al., 2011); right: the left image after mirror-symmetry processing
Mucronaspis (Songxites) mucronata — photo 4
Photo 4 · mucron-, Latin, tip, point; aspis, Greek, shield; songxi, Songxi, Wuning, Jiangxi Type specimen figures (A lectotype, B paralectotype; Sweden; Owen 1981) Cranidium, hypostome and pygidium figures (Zhejiang; Zhou et al., 2011) Left: nearly complete dorsal exoskeleton (Zhejiang; Zhou et al., 2011); right: the left image after mirror-symmetry processing
Mucronaspis (Songxites) mucronata — photo 5
Photo 5 · mucron-, Latin, tip, point; aspis, Greek, shield; songxi, Songxi, Wuning, Jiangxi Type specimen figures (A lectotype, B paralectotype; Sweden; Owen 1981) Cranidium, hypostome and pygidium figures (Zhejiang; Zhou et al., 2011) Left: nearly complete dorsal exoskeleton (Zhejiang; Zhou et al., 2011); right: the left image after mirror-symmetry processing
Mucronaspis (Songxites) mucronata — photo 6
Photo 6 · mucron-, Latin, tip, point; aspis, Greek, shield; songxi, Songxi, Wuning, Jiangxi Type specimen figures (A lectotype, B paralectotype; Sweden; Owen 1981) Cranidium, hypostome and pygidium figures (Zhejiang; Zhou et al., 2011) Left: nearly complete dorsal exoskeleton (Zhejiang; Zhou et al., 2011); right: the left image after mirror-symmetry processing
Classification
Order Phacopida / Suborder Phacopina / Superfamily Dalmanitoidea / Family Dalmanitidae
Genus
Mucronaspis, subgenus Songxites (Mucronaspis
Genus author
Lin Tianrui
Genus etymology
(Songxites)) Lin, 1981
Species
M. (S.) mucronata (Brongniart, 1822)
Species author
Brongniart A.
Species etymology
mucron-, Latin, tip, point
Age
Hirnantian (Late Ordovician)
Distribution
Zhejiang, Guizhou, Sichuan, etc.; Sweden, UK, Canada
Synonyms
Asaphus mucronatus; Dalmanitina hastingsi; Dalmanitina mucronata; Dalmanitina (Dalmanitina) mucronata; Mucronaspis mucronata; Mucronaspis mucronata mucronata; Mucronaspis mucronata juna
Diagnosis
Glabella expanding evenly forward with three pairs of glabellar lateral furrows; anterior border narrow; eyes convex, medium-sized; librigenae narrow and small; hypostome with 2-3 pairs of small spines on the posterior margin. Thorax of 11 segments; pleural furrows narrow, pleural spines short. Pygidial axis with more than 10 rings, the terminal piece extended into a pygidial spine.