Halecomorphi (original) (raw)
Gli alecomorfi (Halecomorphi) sono un gruppo di pesci ossei, attualmente rappresentati dalla sola amia (Amia calva). I più antichi resti fossili di alecomorfi risalgono al Triassico inferiore (circa 251 milioni di anni fa), e la maggior parte delle forme appartenenti a questo gruppo vissero nel corso dell'era Mesozoica.
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| dbo:abstract | Die Halecomorphi sind ein Taxon der Neuflosser (Neopterygii). Es umfasst die rezenten Kahlhechte (Amia) sowie ihre nähere fossile Verwandtschaft (Amiidae, Caturidae, Liodesmidae, Sinamiidae, Ionoscopiformes, Parasemionotiformes). Die Halecomorphi zeichnen sich einerseits durch ursprüngliche Merkmale, wie meist stark mineralisierte Schuppen, aber auch durch „moderne“ Merkmale, insbesondere im Bau des Schädels (z. B. Lage und Form des Präoperculare), aus. Zur systematischen Stellung der Halecomorphi existieren zwei konkurrierende Hypothesen: * Die Halecostomi-Hypothese sieht sie als Schwestergruppe der Echten Knochenfische (Teleostei). * Die Holostei-Hypothese sieht sie als Schwestergruppe der Knochenhechte (Lepisosteidae) und deren näherer fossiler Verwandtschaft, die gemeinsam unter dem Namen Ginglymodi firmieren. (de) Halecomorphi is a taxon of ray-finned bony fish in the clade Neopterygii. The sole living Halecomorph is the bowfin (Amia calva), but the group contains many extinct species in several families (including Amiidae, Caturidae, Liodesmidae, Sinamiidae) in the order Amiiformes, as well as the extinct orders , , and Parasemionotiformes. The fossil record of halecomorphs goes back at least to the Early Triassic epoch. The Halecomorphi exhibit a combination of ancestral features, such as most heavily mineralized scales, but also by more derived or "modern" features, particularly in the structure of the skull (e.g. position and shape of preopercles). Unique derived traits (synapomorphies) of the Halecomorphi include: * Unique jaw articulation in which the quadrate and symplectic participate in the joint. * Lengthened dorsal fins (in some species) * Two biconcave vertebrae per segment in the posterior body region (a condition known as ) * Fan like arrangement of small bones in the tail. (en) Gli alecomorfi (Halecomorphi) sono un gruppo di pesci ossei, attualmente rappresentati dalla sola amia (Amia calva). I più antichi resti fossili di alecomorfi risalgono al Triassico inferiore (circa 251 milioni di anni fa), e la maggior parte delle forme appartenenti a questo gruppo vissero nel corso dell'era Mesozoica. (it) Halecomorphi (лат.) — надотряд лучепёрых рыб из подкласса новопёрых, живших в основном с триаса по плейстоцен. Ископаемые Halecomorphi были найдены на территории Северной Америки, Европы, Азии и Африки. Впервые был описан Копом в 1872 году. Единственный сохранившийся вид — ильная рыба (амия). (ru) |
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| dbp:authority | Cope, 1872 (en) |
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| dbp:image | Amia calva 1908.jpg (en) |
| dbp:image2Caption | Amia calva (en) |
| dbp:imageCaption | dbr:Cretaceous dbr:Cipactlichthys_scutatus |
| dbp:subdivision | * Amiiformes ** Amiidae ** Caturidae ** Liodesmidae ** Sinamiidae * Ionoscopiformes ** Ionoscopidae ** Oshuniidae ** Ophiopsidae * Panxianichthyiformes ** Panxianichthyiidae * Parasemionotiformes ** Parasemionidae ** Promecosominidae (en) |
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| dbp:taxon | Halecomorphi (en) |
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| gold:hypernym | dbr:Taxon |
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| rdfs:comment | Gli alecomorfi (Halecomorphi) sono un gruppo di pesci ossei, attualmente rappresentati dalla sola amia (Amia calva). I più antichi resti fossili di alecomorfi risalgono al Triassico inferiore (circa 251 milioni di anni fa), e la maggior parte delle forme appartenenti a questo gruppo vissero nel corso dell'era Mesozoica. (it) Halecomorphi (лат.) — надотряд лучепёрых рыб из подкласса новопёрых, живших в основном с триаса по плейстоцен. Ископаемые Halecomorphi были найдены на территории Северной Америки, Европы, Азии и Африки. Впервые был описан Копом в 1872 году. Единственный сохранившийся вид — ильная рыба (амия). (ru) Die Halecomorphi sind ein Taxon der Neuflosser (Neopterygii). Es umfasst die rezenten Kahlhechte (Amia) sowie ihre nähere fossile Verwandtschaft (Amiidae, Caturidae, Liodesmidae, Sinamiidae, Ionoscopiformes, Parasemionotiformes). Die Halecomorphi zeichnen sich einerseits durch ursprüngliche Merkmale, wie meist stark mineralisierte Schuppen, aber auch durch „moderne“ Merkmale, insbesondere im Bau des Schädels (z. B. Lage und Form des Präoperculare), aus. Zur systematischen Stellung der Halecomorphi existieren zwei konkurrierende Hypothesen: (de) Halecomorphi is a taxon of ray-finned bony fish in the clade Neopterygii. The sole living Halecomorph is the bowfin (Amia calva), but the group contains many extinct species in several families (including Amiidae, Caturidae, Liodesmidae, Sinamiidae) in the order Amiiformes, as well as the extinct orders , , and Parasemionotiformes. The fossil record of halecomorphs goes back at least to the Early Triassic epoch. (en) |
| rdfs:label | Halecomorphi (en) Halecomorphi (de) Halecomorphi (it) Halecomorphi (nl) Halecomorphi (ru) |
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