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- Cephalodiscus gracilis Photos of a colony and individuals.
- Class Pterobranchia General information.
- Rhabdopleura kozlowskii Diagnosis, occurrence, images and references of the Jurassic species.
- Pterobranchia: Classification of the Rhabdopleuroidea List of extinct and extant families, genera and species.
- Cephalodiscus lutetianus (Graptolithoidea, Cephalodiscoidea) The only fossil species of the genus Cephalodiscus.
- Cephalodiscus and Classification of Cephalodiscoidea List of species and genera of recent and fossil cephalodiscid pterobranchs.
- SEM Micrographs of Rhabdopleura compacta. Three coenecia (two young) collected from Stoke Point, England, are illustrated.
- Collagen in the Pterobranch Coenecium Results of amino-acid analysis of the coenecium of Cephalodiscus and Rhabdopleura.
- Cephalodiscus densus Andersson, 1907 (Hemichordata, Graptolithoidea). Zooid and coenecium morphology of a cephalodiscid pterobranch from Terra Nova Bay, Ross Sea.
- Cephalodiscus graptolitoides Dilly, 1993. This species, a probable extant graptolite (according to some researchers), is regarded as a living fossil.
- The Oldest Known Cephalodiscus-like Hemichordate Eocephalodiscus polonicus Kozlowski from the upper Tremadocian of Poland: pictures of the holotype, links.
- First Occurrence of Rhabdopleura in North America First fossil representatives of Rhabdopleura (Graptolithoidea: Rhabdopleuroidea) in North America are reported.
- Pterobranchia Information from Wikipedia on these worm-shaped animals.