Phacopida

Ductina vietnamica

Order Phacopida / Suborder Phacopina / Superfamily Phacopoidea / Family Phacopidae

Eifelian (Middle Devonian)Guangxi, Vietnam
Ductina vietnamica — photo 1
Photo 1 · Early literature specimen figures (Guangxi; Yi (illustrated by Zong Ruiwen; Zeng (Guangxi; Captain Wu) Yong'en et al. 1975) Guangchun et al. 2018) Complete dorsal exoskeleton Exuvia specimen figures (Guangxi; Han Nairen (Guangxi; Baishui) et al. 2007) Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Pengcheng Jianke) (Guangxi; Haixiang) (Guangxi; Xuanling) (Guangxi; Shao Chirou)
Ductina vietnamica — photo 2
Photo 2 · Early literature specimen figures (Guangxi; Yi (illustrated by Zong Ruiwen; Zeng (Guangxi; Captain Wu) Yong'en et al. 1975) Guangchun et al. 2018) Complete dorsal exoskeleton Exuvia specimen figures (Guangxi; Han Nairen (Guangxi; Baishui) et al. 2007) Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Pengcheng Jianke) (Guangxi; Haixiang) (Guangxi; Xuanling) (Guangxi; Shao Chirou)
Ductina vietnamica — photo 3
Photo 3 · Early literature specimen figures (Guangxi; Yi (illustrated by Zong Ruiwen; Zeng (Guangxi; Captain Wu) Yong'en et al. 1975) Guangchun et al. 2018) Complete dorsal exoskeleton Exuvia specimen figures (Guangxi; Han Nairen (Guangxi; Baishui) et al. 2007) Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Pengcheng Jianke) (Guangxi; Haixiang) (Guangxi; Xuanling) (Guangxi; Shao Chirou)
Ductina vietnamica — photo 4
Photo 4 · Early literature specimen figures (Guangxi; Yi (illustrated by Zong Ruiwen; Zeng (Guangxi; Captain Wu) Yong'en et al. 1975) Guangchun et al. 2018) Complete dorsal exoskeleton Exuvia specimen figures (Guangxi; Han Nairen (Guangxi; Baishui) et al. 2007) Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Pengcheng Jianke) (Guangxi; Haixiang) (Guangxi; Xuanling) (Guangxi; Shao Chirou)
Ductina vietnamica — photo 5
Photo 5 · Early literature specimen figures (Guangxi; Yi (illustrated by Zong Ruiwen; Zeng (Guangxi; Captain Wu) Yong'en et al. 1975) Guangchun et al. 2018) Complete dorsal exoskeleton Exuvia specimen figures (Guangxi; Han Nairen (Guangxi; Baishui) et al. 2007) Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Pengcheng Jianke) (Guangxi; Haixiang) (Guangxi; Xuanling) (Guangxi; Shao Chirou)
Ductina vietnamica — photo 6
Photo 6 · Early literature specimen figures (Guangxi; Yi (illustrated by Zong Ruiwen; Zeng (Guangxi; Captain Wu) Yong'en et al. 1975) Guangchun et al. 2018) Complete dorsal exoskeleton Exuvia specimen figures (Guangxi; Han Nairen (Guangxi; Baishui) et al. 2007) Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Pengcheng Jianke) (Guangxi; Haixiang) (Guangxi; Xuanling) (Guangxi; Shao Chirou)
Ductina vietnamica — photo 7
Photo 7 · Early literature specimen figures (Guangxi; Yi (illustrated by Zong Ruiwen; Zeng (Guangxi; Captain Wu) Yong'en et al. 1975) Guangchun et al. 2018) Complete dorsal exoskeleton Exuvia specimen figures (Guangxi; Han Nairen (Guangxi; Baishui) et al. 2007) Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Pengcheng Jianke) (Guangxi; Haixiang) (Guangxi; Xuanling) (Guangxi; Shao Chirou)
Ductina vietnamica — photo 8
Photo 8 · Early literature specimen figures (Guangxi; Yi (illustrated by Zong Ruiwen; Zeng (Guangxi; Captain Wu) Yong'en et al. 1975) Guangchun et al. 2018) Complete dorsal exoskeleton Exuvia specimen figures (Guangxi; Han Nairen (Guangxi; Baishui) et al. 2007) Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Pengcheng Jianke) (Guangxi; Haixiang) (Guangxi; Xuanling) (Guangxi; Shao Chirou)
Ductina vietnamica — photo 9
Photo 9 · Early literature specimen figures (Guangxi; Yi (illustrated by Zong Ruiwen; Zeng (Guangxi; Captain Wu) Yong'en et al. 1975) Guangchun et al. 2018) Complete dorsal exoskeleton Exuvia specimen figures (Guangxi; Han Nairen (Guangxi; Baishui) et al. 2007) Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Pengcheng Jianke) (Guangxi; Haixiang) (Guangxi; Xuanling) (Guangxi; Shao Chirou)
Classification
Order Phacopida / Suborder Phacopina / Superfamily Phacopoidea / Family Phacopidae
Genus
Ductina Richter & Richter, 1931
Genus author
Richter R. & Richter E.
Genus etymology
duct, ductus, Latin, water channel
Species
D. vietnamica Maximova, 1965
Species author
Maximova Z. A.
Species etymology
Vietnam, type locality of the type specimens
Age
Eifelian (Middle Devonian)
Distribution
Guangxi, Vietnam
Synonyms
Ductina (Illaenulla) vietnamica; Nandanaspis laevigatus; Ductina (Illaenulla) laevigatus
Diagnosis
Specimens elongate-elliptical, medium-sized, smooth. Cephalon semi-elliptical; glabella smooth, wider anteriorly than posteriorly; dorsal furrows faint; librigenae absent; eyes absent; in some specimens a pair of "occipital pits" can be seen at the base of the glabella. Thorax of 11 segments; axis slightly tapering backward; pleural furrows wide and distinct, ends bluntly rounded. Pygidium subsemicircular; axis indistinctly segmented, tapering markedly backward; pleural region smooth, transverse furrows visible only on the anterior articulating facets; pygidial border absent.