Agnostida

Yakutiana dubium

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Ptychagnostidae

Cambrian, Miaolingian, DrumianZhejiang, Hunan; Australia
Yakutiana dubium — photo 1
Photo 1 · Type specimens (13 cephalon, holotype; 14, 15 pygidia; Australia; Whitehouse 1936) CPC 14360, 58 (Australia; Öpik 1979) (5 mm; Zhejiang; Baishui) NIGP 124183, 181, 185, 186, 187, 189 (Hunan; Peng Shanchi 2020)
Yakutiana dubium — photo 2
Photo 2 · Type specimens (13 cephalon, holotype; 14, 15 pygidia; Australia; Whitehouse 1936) CPC 14360, 58 (Australia; Öpik 1979) (5 mm; Zhejiang; Baishui) NIGP 124183, 181, 185, 186, 187, 189 (Hunan; Peng Shanchi 2020)
Yakutiana dubium — photo 3
Photo 3 · Type specimens (13 cephalon, holotype; 14, 15 pygidia; Australia; Whitehouse 1936) CPC 14360, 58 (Australia; Öpik 1979) (5 mm; Zhejiang; Baishui) NIGP 124183, 181, 185, 186, 187, 189 (Hunan; Peng Shanchi 2020)
Yakutiana dubium — photo 4
Photo 4 · Type specimens (13 cephalon, holotype; 14, 15 pygidia; Australia; Whitehouse 1936) CPC 14360, 58 (Australia; Öpik 1979) (5 mm; Zhejiang; Baishui) NIGP 124183, 181, 185, 186, 187, 189 (Hunan; Peng Shanchi 2020)
Classification
Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Ptychagnostidae
Genus
Yakutiana
Genus author
Ö zdikmen H.
Genus etymology
Yakutia, the type locality of the type species, Yakutia, Siberia, Russia.
Species
Y. dubium (Whitehouse, 1936)
Species author
Whitehouse F. W.
Species etymology
dubius, doubtful.
Age
Cambrian, Miaolingian, Drumian
Distribution
Zhejiang, Hunan; Australia
Synonyms
Phalacroma?dubium; Pseudophalacroma crebra; P. crebrum; P. breviovata; P. dubia; Leiopyge praecox; L. cosfordae; L. dubium; Pseudophalacroma dubium
Diagnosis
Except for the more rounded shape of the cephalon and pygidium, the other characters are almost identical to Yakutiana ovale.
Remarks
This genus was originally named Pseudophalacroma, a junior homonym of a protozoan genus; in 2009 it was replaced by Yakutiana (Özdikmen).