Web Directory

» A New Rhabdopleurid Hemichordate from the Middle Cambrian of Siberia
   Paper by Peter N Durman and Nikolai V Sennikov published in 1992. This species was recognized as the earliest known pterobranch hemichordate.
   http://palaeontology.palass-pubs.org/pdf/Vol%2036/Pages%20283-296.pdf

» Cephalodiscus and Classification of Cephalodiscoidea
   List of species and genera of recent and fossil cephalodiscid pterobranchs.
   http://pterobranchia.graptolite.net/Cephalodiscoidea.html

» Cephalodiscus densus Andersson, 1907 (Hemichordata, Graptolithoidea).
   Zooid and coenecium morphology of a cephalodiscid pterobranch from Terra Nova Bay, Ross Sea.
   http://pterobranchia.graptolite.net/C_densus.html

» Cephalodiscus gracilis
   Photos of a colony and individuals.
   http://faculty.washington.edu/bjswalla/Hemichordata/Pterobranchia/cephalodiscus%20gracilis.html

» Cephalodiscus graptolitoides Dilly, 1993.
   This species, a probable extant graptolite (according to some researchers), is regarded as a living fossil.
   http://sztandary.graptolite.net/graptolitoides.html

» Cephalodiscus lutetianus (Graptolithoidea, Cephalodiscoidea)
   The only fossil species of the genus Cephalodiscus.
   http://www.countofcalmont.com/lutetianus.html

» Class Pterobranchia
   General information.
   http://faculty.washington.edu/bjswalla/Hemichordata/Pterobranchia/class%20pterobranchia.html

» Classification of the Extant Hemichordata
   List of species, genera and families.
   http://cluster3.biosci.utexas.edu/faculty/cameronc/Hemichordate.Species.html

» Collagen in the Pterobranch Coenecium
   Results of amino-acid analysis of the coenecium of Cephalodiscus and Rhabdopleura.
   http://www.graptolite.net/collagen.html

» First Occurrence of Rhabdopleura in North America
   First fossil representatives of Rhabdopleura (Graptolithoidea: Rhabdopleuroidea) in North America are reported.
   http://sztandary.graptolite.net/Rhabdopleura_anticosti.html

» Pterobranchia
   Information from Wikipedia on these worm-shaped animals.
   http://en.wikipedia.org/wiki/Pterobranchia

» Pterobranchia: Classification of the Rhabdopleuroidea
   List of extinct and extant families, genera and species.
   http://pterobranchia.graptolite.net/Rhabdopleuroidea.html

» Rhabdopleura kozlowskii
   Diagnosis, occurrence, images and references of the Jurassic species.
   http://pterobranchia.graptolite.net/Rhabdopleura_kozlowskii.html

» SEM Micrographs of Rhabdopleura compacta.
   Three coenecia (two young) collected from Stoke Point, England, are illustrated.
   http://kulicki.mierzejewski.biz/compacta.html

» The Oldest Known Cephalodiscus-like Hemichordate
   Eocephalodiscus polonicus Kozlowski from the upper Tremadocian of Poland: pictures of the holotype, links.
   http://www.mierzejewski.info/Eocephalodiscus.html