Linked from
The 14 pages that link to Ostracoderm, each with the reason it gives.
Dermal boneBroader topic: Their armor provides an early fossil record of dermal skeletal elements.
AgnathaBroader topic: Ostracoderms are prominent fossil representatives of traditional Agnatha.
AnaspidaRelated: Anaspids were historically grouped among these diverse armored jawless vertebrates.
ArandaspisRelated: Arandaspis is commonly grouped among these armoured early fishes.
CyclostomiCompared with: Ostracoderms were jawless too, but are not living members of Cyclostomi.