Name: Asaphus
kotlukovi & cystoid (Russian
Asaphida Trilobites) Geological
Time: Middle Ordovician
Size: 48
mm
Fossil
Site: Russian trilobites Asery level, St. Petersburg region, Wolchow
river, Russia
| Asaphus
kotlukovi represents an evolutionary branch beginning and ending
in the Middle Ordovician. It begins a morphological sequence of
increasing eye-stalk size, and was progenitor of Asaphus punctatus,
and later Asaphus intermedius that had increasingly higher eye stalks.
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