Graptolite
Mainly extinct colonial hemichordates whose fossils are important for correlating Ordovician and Silurian marine strata; some living pterobranchs are now included in Graptolithina.
Language and route: Scientific Latin Graptolithus, from Greek roots. Greek graptós, ‘written/marked’, plus líthos, ‘stone’; coined as Graptolithus by Linnaeus in 1735.
Literal gloss: writing on stone
The name and its history
Carl Linnaeus (*Graptolithus*) · 1735
- What does the word literally mean?
- ‘Written stone’ or ‘stone-marking’.
- What did the original author mean?
- Linnaeus used Graptolithus (1735) in connection with apparently written markings on rock, without recognising them as extinct colonial animals.
- Why was the name needed?
- Naturalists needed to label strange branching or serrated dark impressions even while their origin—as stone markings, plants or animals—remained uncertain.
- What evidence supported the original concept?
- External resemblance to marks or writing, later detailed studies of the skeletal colonies and their fossil succession.
- How has geology changed the concept?
- The name now denotes a group traditionally known from abundant extinct forms. Modern classifications also include living pterobranchs such as Rhabdopleura within Graptolithina; fossil distributions remain key to Ordovician–Silurian biostratigraphy.
Further historical context
This example shows why a literal root cannot be interpreted through current taxonomy: Linnaeus did not mean exactly what contemporary palaeontologists mean by graptolite.
Editorial qualification
Linnaeus’s presumed inorganic markings became an animal name, but the living pterobranch relationship also complicates the shorthand description of all graptolites as extinct.
Related names
Sources
- Maletz (2017), History of Graptolite Classification, Treatise Online 88 — Linnaeus 1735 meaning and later zoological reclassification
- Maletz (2017), Graptolites: fossil and living — Living pterobranch graptolites and modern taxonomic scope
- ICS International Stratigraphic Guide, Biostratigraphic Units — Definitions and limits of biostratigraphic zones