Name: Palaeospondylus ‭(‬Ancient vertebrae‭)‬.
Phonetic: Pay-le-oh-spon-dy-lus.
Classification: Chordata,‭ ‬Vertebrata.
Species: P.‭ ‬gunni.
Diet: Filter feeder‭?
Size: About‭ ‬6‭ ‬centimetres long.
Known locations: Scotland,‭ ‬Caithness.
Time period: Mid Devonian.
Fossil representation: Specimen preserved flat.

       Usually considered to be a primitive fish with an elongate eel-like body,‭ ‬there is no universal agreement into what Palaeospondylus actually was.‭ ‬In the past Palaeospondylus has been proposed to be a larval lungfish,‭ ‬unarmoured placoderm,‭ ‬ an arthrodire,‭ ‬a chimaera and even a larval tetrapod.
       A primitive fish that might be similar to Palaeospondylus in form,‭ ‬and also known from Scotland,‭ ‬is Jamoytius.

Further reading
- Palaeospondylus as a primitive hagfish. - Zoological Letters. 2 (1): 20. - T. Hirasawa, Y. Oisi & S. Kuratani - 2016.
- Questioning hagfish affinities of the enigmatic Devonian vertebrate Palaeospondylus. - Royal Society Open Science. 4 (7): 170214. - Zerina Johanson, Moya Smith, Sophie Sanchez, Tim Senden, Kate Trinajstic & Cathrin Pfaff - 2017.


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