Swiftopecten djoserus '(Yoshimura, 2017) is an extinct species of bivalve belonging to the subclass Pteriomorphia and family Pectinidae that lived during the Late Pliocene, approximately 2.75 Ma. Their two valves have step-like growth ribs.

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Quick Facts Scientific classification, Binomial name ...

Swiftopecten djoserus Temporal range: Late Pliocene PreꞒ Ꞓ O S D C P T J K Pg N ↓
The holotype specimen of Swiftopecten djoserus (Yoshimura, 2017) from Toyama Pref., Japan, owned by National Museum of Nature and Science, Tokyo (No. PM27195).
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Order:	Pectinida
Family:	Pectinidae
Genus:	Swiftopecten
Species:	S. djoserus
Binomial name
Swiftopecten djoserus Yoshimura, 2017

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The species name comes from the Pyramid of Djoser in Saqqara, Egypt; the commarginal constrictions of Swiftopecten djoserus resemble the unique stepwise form of this pyramid.