Asaphida

Birmanites birmanicus

Order Asaphida / Superfamily Asaphoidea / Family Asaphidae

Katian (Late Ordovician)Yunnan, Zhejiang; Myanmar
Birmanites birmanicus — photo 1
Photo 1 · Type specimens, 2a is the holotype GSI 11522, 2b a distorted restoration (Myanmar; Fortey et al., Restoration (Fortey et al., 2022) 2022) (Yunnan; Lixia) Literature specimen (Zhejiang; Sheng Zifu 1934) (Yunnan; Baishui) (Yunnan; Tuyang Tuseng Po) Complete dorsal exoskeleton (Yunnan; Lixia)
Birmanites birmanicus — photo 2
Photo 2 · Type specimens, 2a is the holotype GSI 11522, 2b a distorted restoration (Myanmar; Fortey et al., Restoration (Fortey et al., 2022) 2022) (Yunnan; Lixia) Literature specimen (Zhejiang; Sheng Zifu 1934) (Yunnan; Baishui) (Yunnan; Tuyang Tuseng Po) Complete dorsal exoskeleton (Yunnan; Lixia)
Birmanites birmanicus — photo 3
Photo 3 · Type specimens, 2a is the holotype GSI 11522, 2b a distorted restoration (Myanmar; Fortey et al., Restoration (Fortey et al., 2022) 2022) (Yunnan; Lixia) Literature specimen (Zhejiang; Sheng Zifu 1934) (Yunnan; Baishui) (Yunnan; Tuyang Tuseng Po) Complete dorsal exoskeleton (Yunnan; Lixia)
Birmanites birmanicus — photo 4
Photo 4 · Type specimens, 2a is the holotype GSI 11522, 2b a distorted restoration (Myanmar; Fortey et al., Restoration (Fortey et al., 2022) 2022) (Yunnan; Lixia) Literature specimen (Zhejiang; Sheng Zifu 1934) (Yunnan; Baishui) (Yunnan; Tuyang Tuseng Po) Complete dorsal exoskeleton (Yunnan; Lixia)
Birmanites birmanicus — photo 5
Photo 5 · Type specimens, 2a is the holotype GSI 11522, 2b a distorted restoration (Myanmar; Fortey et al., Restoration (Fortey et al., 2022) 2022) (Yunnan; Lixia) Literature specimen (Zhejiang; Sheng Zifu 1934) (Yunnan; Baishui) (Yunnan; Tuyang Tuseng Po) Complete dorsal exoskeleton (Yunnan; Lixia)
Birmanites birmanicus — photo 6
Photo 6 · Type specimens, 2a is the holotype GSI 11522, 2b a distorted restoration (Myanmar; Fortey et al., Restoration (Fortey et al., 2022) 2022) (Yunnan; Lixia) Literature specimen (Zhejiang; Sheng Zifu 1934) (Yunnan; Baishui) (Yunnan; Tuyang Tuseng Po) Complete dorsal exoskeleton (Yunnan; Lixia)
Birmanites birmanicus — photo 7
Photo 7 · Type specimens, 2a is the holotype GSI 11522, 2b a distorted restoration (Myanmar; Fortey et al., Restoration (Fortey et al., 2022) 2022) (Yunnan; Lixia) Literature specimen (Zhejiang; Sheng Zifu 1934) (Yunnan; Baishui) (Yunnan; Tuyang Tuseng Po) Complete dorsal exoskeleton (Yunnan; Lixia)
Classification
Order Asaphida / Superfamily Asaphoidea / Family Asaphidae
Genus
Birmanites Sheng, 1934
Genus author
Sheng Xinfu
Genus etymology
Birma, Dutch, Burma (Myanmar); -ites, a noun suffix meaning resembling or related to
Species
B. birmanicus (Reed, 1915)
Species author
Reed F. R. C.
Species etymology
Birma, Dutch, Burma (Myanmar)
Age
Katian (Late Ordovician)
Distribution
Yunnan, Zhejiang; Myanmar
Synonyms
Ogygites birmanicus
Diagnosis
Cephalon and pygidium with distinct concentric terrace lines. Glabella short, constricted medially, a pair of glabellar furrows dividing it into a large pear-shaped median lobe and subtriangular basal lobes on either side, with a median node at the base; preglabellar field longitudinally very long; eyes large, close to the posterior part of the glabella; posterior wings narrow and wide; librigenae wide with short stout genal spines; anterior branches of facial sutures diverging forward, then bending sharply inward, meeting at a point on the median point of the anterior margin of the dorsal shield. Thorax of eight segments; axis extremely narrow; pleurae wide with distinct pleural furrows and short pointed ends. Pygidium large; axis narrow, with 12 rings plus a terminal piece; pleural region with 6-7 distinct pleural furrows; border wide, demarcation indistinct.
Remarks
This species is the type species of the genus Birmanites.