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Paper by Peter N Durman and Nikolai V Sennikov published in 1992. This species was recognized as the earliest known pterobranch hemichordate.

The Carboniferous rhabdopleurid graptolite closely resembling the extant species Rhabdopleura compacta Hincks.

Scientific explanation of the formation of the mountain.

Diagnosis, occurrence, images and references of the Jurassic species.

A free graptolite researcher and a Rosicrucian Frater. Research interests, primarily in sessile graptolites and pterobranchs, and publications.

Collaborative effort of biologists from around the world, providing information about the diversity of organisms on Earth, their evolutionary history (phylogeny) ...

An encyclopedia of life on earth.

This species, a probable extant graptolite (according to some researchers), is regarded as a living fossil.