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- Acanthodii abstract "Acanthodii (sometimes called spiny sharks) is a class of extinct fish, sharing features with both bony fish and cartilaginous fish. In form they resembled sharks, but their epidermis was covered with tiny rhomboid platelets like the scales of holosteans (gars, bowfins). They may have been an independent phylogenetic branch of fishes, which had evolved from generalized or basal forms similar to primitive members of the still-extant Chondrichthyes.The popular name "spiny sharks" is really a misnomer for these early jawed fishes. The name was coined because they were superficially shark-shaped, with a streamlined body, paired fins, and a strongly upturned tail; stout, largely immovable bony spines supporting all the fins except the tail - hence, "spiny sharks". Fossilized spines and scales are often all that remains of these fishes in ancient sedimentary rocks. Although not sharks or cartilaginous fish, acanthodians did, in fact, have a cartilaginous skeleton, but their fins had a wide, bony base and were reinforced on their anterior margin with a dentine spine. The earliest acanthodians were marine, but during the Devonian, freshwater species became predominant.There are three orders recognized: Climatiiformes, Ischnacanthiformes and Acanthodiformes. Climatiiforma had shoulder armor and many small sharp spines, Ischnacanthiforma with teeth fused to the jaw, and the Acanthodiforma were filter feeders, with no teeth in the jaw, but long gill rakers. Overall, the acanthodians' jaws are presumed to have evolved from the first gill arch of some ancestral jawless fishes that had a gill skeleton made of pieces of jointed cartilage.".
- Acanthodii thumbnail Acanthodes_BW.jpg?width=300.
- Acanthodii wikiPageExternalLink Acanthodiformes.htm.
- Acanthodii wikiPageExternalLink Ischnacanthiformes.
- Acanthodii wikiPageExternalLink Climatiiformes.htm.
- Acanthodii wikiPageExternalLink Ischnacanthiformes.htm.
- Acanthodii wikiPageExternalLink showpost.php?p=18038&postcount=1.
- Acanthodii wikiPageExternalLink cata3.htm.
- Acanthodii wikiPageID "945696".
- Acanthodii wikiPageRevisionID "601590715".
- Acanthodii at "1".
- Acanthodii at "11".
- Acanthodii at "22".
- Acanthodii authority "Owen, 1846".
- Acanthodii colour "green".
- Acanthodii colour "red".
- Acanthodii hasPhotoCollection Acanthodii.
- Acanthodii imageCaption "Acanthodes sp.".
- Acanthodii imageWidth "250".
- Acanthodii label "Acanthodii".
- Acanthodii label "Placodermi".
- Acanthodii size "25".
- Acanthodii style "85.0".
- Acanthodii subdivision Climatiiformes.
- Acanthodii subdivision "Acanthodiformes".
- Acanthodii subdivision "Ischnacanthiformes".
- Acanthodii subdivisionRanks "Orders".
- Acanthodii subject Category:Acanthodii.
- Acanthodii subject Category:Classes_(biology).
- Acanthodii subject Category:Permian_extinctions.
- Acanthodii subject Category:Teleostomi.
- Acanthodii type Abstraction100002137.
- Acanthodii type Attribute100024264.
- Acanthodii type Extinction114012173.
- Acanthodii type Inaction114010148.
- Acanthodii type PermianExtinctions.
- Acanthodii type State100024720.
- Acanthodii type Animal.
- Acanthodii type BiologicalLivingObject.
- Acanthodii type EukaryoticCell.
- Acanthodii comment "Acanthodii (sometimes called spiny sharks) is a class of extinct fish, sharing features with both bony fish and cartilaginous fish. In form they resembled sharks, but their epidermis was covered with tiny rhomboid platelets like the scales of holosteans (gars, bowfins).".
- Acanthodii label "Acanthodii".
- Acanthodii label "Acanthodii".
- Acanthodii label "Acanthodii".
- Acanthodii label "Acanthodii".
- Acanthodii label "Acanthodii".
- Acanthodii label "Acanthodii".
- Acanthodii label "Acanthodii".
- Acanthodii label "Fałdopłetwe".
- Acanthodii label "Акантоды".
- Acanthodii label "قرشيات شوكية".
- Acanthodii label "棘魚綱".
- Acanthodii label "棘魚類".
- Acanthodii sameAs Trnoploutví.
- Acanthodii sameAs Acanthodii.
- Acanthodii sameAs Acanthodii.
- Acanthodii sameAs Acanthodii.
- Acanthodii sameAs Acanthodii.
- Acanthodii sameAs Acanthodii.
- Acanthodii sameAs 棘魚類.
- Acanthodii sameAs 극어류.
- Acanthodii sameAs Acanthodii.
- Acanthodii sameAs Fałdopłetwe.
- Acanthodii sameAs Acanthodii.
- Acanthodii sameAs m.03s7z_.
- Acanthodii sameAs Q130955.
- Acanthodii sameAs Q130955.
- Acanthodii sameAs Acanthodii.
- Acanthodii wasDerivedFrom Acanthodii?oldid=601590715.
- Acanthodii depiction Acanthodes_BW.jpg.
- Acanthodii isPrimaryTopicOf Acanthodii.