Graptolites (Graptolithina) + pterobranchs (Pterobranchia) = hemichordate class Graptolithoidea.
Graptolite Net
Links to graptolite and pterobranch pages, abstracts, articles, graptolite researchers.
2024-06-23
Science, Earth Sciences, Paleontology, Invertebrates - Graptolite Net. Links to graptolite and pterobranch pages, abstracts, articles, graptolite researchers.