Mollusca		ROSTROCONCHIA
Basal Mollusca		Ribeirioida

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Ribeirioida

Conchifera (Helcionelloida) |--Monoplacophora `--+--Diasoma | |--ROSTROCONCHIA | | |--RIBEIRIOIDA | | `--CONOCARDIOIDA | `--Bivalvia `--Cyrtosoma

Introduction   Genera

Introduction

Early Cambrian to Llandovery

drawings © Peter Wagner

Genera

The following list of genera is from the Systema Naturae 2000 Rostroconchia page on Ribeirioida

Genus Anisotechnophorus

Genus Apoptopegma
Stratigraphic range: Early Ordovician

Genus Cymatopegma
Stratigraphic range: Furongian

Genus Heraultipegma
Stratigraphic range: Early Cambrian

Genus Ischyrinia
Stratigraphic range: Middle Ordovician to Late Ordovician

Genus Kimopegma
Stratigraphic range: Furongian

Genus Myocaris
Stratigraphic range: Middle Ordovician

Genus Oepikila
Stratigraphic range: Furongian

Genus Pauropegma
Stratigraphic range: Early Ordovician

Genus Pinnocaris
Stratigraphic range: Furongian to Late Ordovician

Genus Pleuropegma

Genus Ptychopegma
Stratigraphic range: Early Ordovician

Genus Ribeiria
Stratigraphic range: Furongian to Middle Ordovician

Genus Technophorus
Stratigraphic range: Early Ordovician to Late Ordovician

Genus Tolmachovia
Stratigraphic range: Early Ordovician to Middle Ordovician

Genus Wanwania