Cephalodiscus and Classification of Cephalodiscoid
List of species and genera of recent and fossil cephalodiscid pterobranchs.
Cephalodiscus densus Andersson, 1907 (Hemichordata
Zooid and coenecium morphology of a cephalodiscid pterobranch from Terra Nova Bay, Ross Sea.
Cephalodiscus gracilis
Photos of a colony and individuals.
Cephalodiscus graptolitoides Dilly, 1993.
This species, a probable extant graptolite (according to some researchers), is regarded as a living fossil.
Cephalodiscus lutetianus (Graptolithoidea, Cephalo
The only fossil species of the genus Cephalodiscus.
Class Pterobranchia
General information.
Classification of the Extant Hemichordata
List of species, genera and families.
Collagen in the pterobranch coenecium
Results of amino-acid analysis of the coenecium of Cephalodiscus and Rhabdopleura.
Pterobranchia: Classification of the Rhabdopleuroi
List of extinct and extant families, genera and species.
Rhabdopleura kozlowskii
Diagnosis, occurrence, images and references of the Jurassic species.
Rhabdopleura sp.
A colony of Rhabdopleura showing extended and contracted zooids.
SEM micrographs of Rhabdopleura compacta.
Three coenecia (two young) collected from Stoke Point, England, are illustrated.
The earliest known pterobranch hemichordate
Rhabdotubus johanssoni, described by S. Bengtson and A. Urbanek in 1986 from the early Middle Cambrian of Sweden, was recognized as the earliest known pterobranch hemichordate!