Palaeos		Rostroconchia
Mollusca		Ribeirioida

Rostroconchia: Ribeirioida

MOLLUSCA
|--ACULIFERA
`--CONCHIFERA
   |==TRYBLIDIIDA (Monoplacophora)
   |   `--CEPHALOPODA
   `==HELCIONELLOIDA
       |--ROSTROCONCHIA
       |  |--+--Conocardiida
       |  |   `--+==Ribeirioida
       |  |      `--SCAPHOPODA
       |  `--BIVALVIA
       `--GASTROPODA

Taxa on This Page

1. Ribeirioida

Introduction

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

Descriptions

Ribeirioida

Range: Early Cambrian to Llandovery

Phylogeny: Rostroconchia : Conocardiida + (Scaphopoda + *)

Comments: may or may not be paraphyletic group ancestral to extant Scaphopods (see comments at the Beak-Shells' Legacy). MAK120614