Amplectobeluidae | |
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Amplectobelua (left) and Lyrarapax (right) | |
Scientific classification
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Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | † Dinocaridida |
Order: | † Radiodonta |
Clade: | †
Amplectobeluidae Pates et al., 2019 |
Genera | |
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Amplectobeluidae is a clade of Cambrian radiodonts. It currently includes five definitive genera, Amplectobelua, Lyrarapax, Ramskoeldia, Guanshancaris and a currently unnamed genus from the lower Cambrian aged Sirius Passet site in Greenland. [1] There is also a potential fifth genus, Houcaris, but that genus has become problematic in terms of its taxonomic placement. [2] [3]
In 2014, Amplectobeluidae was defined as the most inclusive clade including Amplectobelua symbrachiata but not Anomalocaris canadensis, Tamisiocaris borealis, or Hurdia victoria. [4]
Amplectobeluids could be recognized by frontal appendages with well-developed first distal endite, which forming a pincer-like structure that presumably better suited for a grasping function. [4] [5] Complete body fossils of amplectobeluids are only known by Amplectobelua and Lyrarapax, both showing combination of characters resembling Anomalocaris (i.e. streamlined body; small head with ovoid sclerites; well-developed swimming flaps; a pair of caudal furcae). [6] [7] [8] [9] [10] Another distinctive features only known in amplectobeluid genera were pairs of gnathobase-like structures (known by Amplectobelua and Ramskoeldia), [9] [11] or an oral cone with combination of tetraradial arrangement and scale-like nodes (known by Lyrarapax and Guanshancaris). [8] [12] [13]
Early in 2014, "Anomalocaris" kunmingensis was tentatively assigned to Amplectobelua by Vinther et al. [4] Later that year, however, the discoverers of Lyrarapax unguispinus ignored that assessment and created a genus within Amplectobelua sensu Vinther et al. [7] Indeterminate frontal appendages assignable to this group are known from the Parker Formation of Vermont. [14]
An a posteriori-weighted phylogenetic analysis in 2014 found the following relationships within the Amplectobeluidae: [7]
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Amplectobeluidae | |
---|---|
![]() | |
Amplectobelua (left) and Lyrarapax (right) | |
Scientific classification
![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | † Dinocaridida |
Order: | † Radiodonta |
Clade: | †
Amplectobeluidae Pates et al., 2019 |
Genera | |
|
Amplectobeluidae is a clade of Cambrian radiodonts. It currently includes five definitive genera, Amplectobelua, Lyrarapax, Ramskoeldia, Guanshancaris and a currently unnamed genus from the lower Cambrian aged Sirius Passet site in Greenland. [1] There is also a potential fifth genus, Houcaris, but that genus has become problematic in terms of its taxonomic placement. [2] [3]
In 2014, Amplectobeluidae was defined as the most inclusive clade including Amplectobelua symbrachiata but not Anomalocaris canadensis, Tamisiocaris borealis, or Hurdia victoria. [4]
Amplectobeluids could be recognized by frontal appendages with well-developed first distal endite, which forming a pincer-like structure that presumably better suited for a grasping function. [4] [5] Complete body fossils of amplectobeluids are only known by Amplectobelua and Lyrarapax, both showing combination of characters resembling Anomalocaris (i.e. streamlined body; small head with ovoid sclerites; well-developed swimming flaps; a pair of caudal furcae). [6] [7] [8] [9] [10] Another distinctive features only known in amplectobeluid genera were pairs of gnathobase-like structures (known by Amplectobelua and Ramskoeldia), [9] [11] or an oral cone with combination of tetraradial arrangement and scale-like nodes (known by Lyrarapax and Guanshancaris). [8] [12] [13]
Early in 2014, "Anomalocaris" kunmingensis was tentatively assigned to Amplectobelua by Vinther et al. [4] Later that year, however, the discoverers of Lyrarapax unguispinus ignored that assessment and created a genus within Amplectobelua sensu Vinther et al. [7] Indeterminate frontal appendages assignable to this group are known from the Parker Formation of Vermont. [14]
An a posteriori-weighted phylogenetic analysis in 2014 found the following relationships within the Amplectobeluidae: [7]
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