Agnostida

Corrugatagnostus magnodosus

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Metagnostidae

Ordovician, Middle Ordovician DarriwilianGermany

Corrugatagnostus magnodosus — photo 1 — Photo 1 · Holotype IMGP Gö 1081-T18, internal mould on left, external mould on right Holotype specimen in colour (Koch (Germany; Koch 1999) 2010) Pygidial specimen IMGP Gö 1081-T26, internal mould on left, external mould on right (Germany; Koch 1999)

Corrugatagnostus magnodosus — photo 2 — Photo 2 · Holotype IMGP Gö 1081-T18, internal mould on left, external mould on right Holotype specimen in colour (Koch (Germany; Koch 1999) 2010) Pygidial specimen IMGP Gö 1081-T26, internal mould on left, external mould on right (Germany; Koch 1999)

Corrugatagnostus magnodosus — photo 3 — Photo 3 · Holotype IMGP Gö 1081-T18, internal mould on left, external mould on right Holotype specimen in colour (Koch (Germany; Koch 1999) 2010) Pygidial specimen IMGP Gö 1081-T26, internal mould on left, external mould on right (Germany; Koch 1999)

Classification

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Metagnostidae

Genus

Corrugatagnostus Kobayashi, 1939

Genus author

Kobayashi T.

Genus etymology

corrugat-, Latin, wrinkled; Agnostus, a trilobite genus name.

Species

C. magnodosus Koch & Lemke, 1997

Species author

Koch L. & Lemke U.

Species etymology

mag-, magnus, large; nodosus, nodose. Referring to the huge node on the glabella.

Age

Ordovician, Middle Ordovician Darriwilian

Distribution

Germany

Diagnosis

Cephalon and pygidium square; cheek of cephalon and pleural region of pygidium covered with large nodose granules; lateral border furrows broad, medial ones narrow. Border furrow of cephalon broad; glabellar frontal lobe trapezoidal, median node long, from the frontal lobe anterior part, crossing F3 to extend to F2; basal lobe relatively small, rounded-triangular. Pygidial axis relatively short, divided into three rings, median node crossing the first two rings.