Asaphida

Xenocyclopyge jaskovitchi

Order Asaphida / Superfamily Cyclopygoidea / Family Cyclopygidae

Sandbian to Katian (Late Ordovician)Shaanxi; Kyrgyzstan
Xenocyclopyge jaskovitchi — photo 1
Photo 1 · Holotype 483/1100 MMG UzSSR (Kyrgyzstan; Repina et al., 1975; literature photograph provided by Prof. Zhou Zhiqiang) Complete enrolled dorsal exoskeleton NIGP131880 (Shaanxi; photograph courtesy of Prof. Zhou Zhiqiang)
Xenocyclopyge jaskovitchi — photo 2
Photo 2 · Holotype 483/1100 MMG UzSSR (Kyrgyzstan; Repina et al., 1975; literature photograph provided by Prof. Zhou Zhiqiang) Complete enrolled dorsal exoskeleton NIGP131880 (Shaanxi; photograph courtesy of Prof. Zhou Zhiqiang)
Classification
Order Asaphida / Superfamily Cyclopygoidea / Family Cyclopygidae
Genus
Xenocyclopyge Lu, 1962
Genus author
Lu Yanhao
Genus etymology
xeno-, from Greek xénos, foreign, strange; Cyclopyge, a trilobite genus name
Species
X. jaskovitchi Petrunina in Repina et al., 1975
Species author
Petrunina Z. E.
Species etymology
Jaskovitch, a surname
Age
Sandbian to Katian (Late Ordovician)
Distribution
Shaanxi; Kyrgyzstan
Synonyms
Microparia (Microparia) Chuanxiensis
Diagnosis
Cephalon subsemi-elliptical; glabella convex, converging forward into a rounded front; a weak median node at the anterior one-third of the glabellar length; two pairs of shallow glabellar furrows, one pair being slightly convergent, narrow longitudinal furrows, the other pair subcircular pits; palpebral lobes narrow band-like, separated from the glabella by narrow distinct dorsal furrows; eyes separated anteriorly by the glabella, elongate-ovate, narrowing forward, of about 24 longitudinal rows of polygonal lenses. Thorax of five segments, axis very wide, gently narrowing backward. Pygidium semi-elliptical; axis conical, gently convex, unsegmented apart from a narrow articulating half-ring and a distinct half-ring furrow; pleural lobes gently convex; border furrow wide and shallow laterally, disappearing behind the axis; border low and gentle.