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Laminacaris is a genus of extinct stem-group arthropods (Radiodonta) that lived during the Cambrian period. It is monotypic with a single species Laminacaris chimera, the fossil of which was described from the Chengjian biota of China in 2018. Around the same time, two specimens that were similar or of the same species were discovered at the Kinzers Formation in Pennsylvania, USA. The first specimens from China were three frontal appendages, without the other body parts.

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  • Laminacaris (en)
  • ラミナカリス (ja)
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  • ラミナカリス（Laminacaris）は、約5億年前のカンブリア紀に生息したラディオドンタ類の節足動物の一属。触手状の前部付属肢の内突起に大小の分岐をもつ、中国の澄江動物群で見つかった Laminacaris chimera という1種のみ正式に記載される。前部付属肢の化石のみによって知られる。 (ja)
  • Laminacaris is a genus of extinct stem-group arthropods (Radiodonta) that lived during the Cambrian period. It is monotypic with a single species Laminacaris chimera, the fossil of which was described from the Chengjian biota of China in 2018. Around the same time, two specimens that were similar or of the same species were discovered at the Kinzers Formation in Pennsylvania, USA. The first specimens from China were three frontal appendages, without the other body parts. (en)
foaf:name
  • Laminacaris chimera (en)
name
  • Laminacaris chimera (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/20191221_Radiodonta_frontal_appendage_Laminacaris_chimera.png
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classis
  • †Dinocaridida (en)
familia
  • †Anomalocarididae? (en)
genus
  • (Guo et al. 2018) (en)
  • †Laminacaris (en)
image caption
  • Frontal appendage (en)
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  • †Radiodonta (en)
phylum
  • Arthropoda (en)
regnum
  • Animalia (en)
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  • species (en)
type species
  • Laminacaris chimera (en)
type species authority
  • Guo et al. 2018 (en)
has abstract
  • Laminacaris is a genus of extinct stem-group arthropods (Radiodonta) that lived during the Cambrian period. It is monotypic with a single species Laminacaris chimera, the fossil of which was described from the Chengjian biota of China in 2018. Around the same time, two specimens that were similar or of the same species were discovered at the Kinzers Formation in Pennsylvania, USA. The first specimens from China were three frontal appendages, without the other body parts. Laminacaris specimens were discovered from three sites in China: the mudstones of the Yu'anshan Member of the Chiungchussu Formation in eastern Yunnan Province, the Mafang section in the Haikou area at Kunming, and the Heimadi section, Chengjiang. The name is derived from Latin words, lamina meaning thin blade, and caris for crab; the species name refers to a Greek mythological creature, Chimera, that has a body composed of parts of more than one animal. In 2022, it is treated that is possibly related to Innovatiocaris and "Anomalocaris" kunmingensis. A discovery of Burgess Shale radiodont Cambroraster falcatus in 2019 that was classified as member of the family Hurdiidae, led to the justification that Laminacaris could be the closest relative of and sister to Hurdiidae among the Radiodonta. Laminacaris may be a transitional form that diverged from the common ancestors. Phylogenetic analysis based on the discovery of Pahvantia hastata, another member of Hurdiidae, shows that Laminacaris falls within the members of the family Anomalocaridae, next to Anomalocaris. The large frontal appendage is the most prominent and distinctive feature in Cambrian arthropods. The frontal appendages of Laminacaris measure 11 cm (for the shortes specimen RCCBYU 10251) and 28 cm (for the longest but incomplete specimen YKLP 13338), and body length is estimated to be up to 78.4 cm, based on proportion of Innovatiocaris (which is once treated as "Anomalocaris" saron). In many radiodonts and anomalocarids, the appendage is divided into segments called podomeres. Laminacaris's appendage has 15 podomeres, including 2 podomeres (podomeres 1 and 2) in the shaft and 13 (podomeres 3–15) in the distal articulated region. The appendage bears several spines called endites on each lobomere. The biggest endite called shaft endite at the base (towards the body) is small and straight in most Cambrian arthropods, but is large, recurved and bears auxiliary spines in Laminacaris, Anomalocaris briggsi and Pahvantia hastata. (en)
  • ラミナカリス（Laminacaris）は、約5億年前のカンブリア紀に生息したラディオドンタ類の節足動物の一属。触手状の前部付属肢の内突起に大小の分岐をもつ、中国の澄江動物群で見つかった Laminacaris chimera という1種のみ正式に記載される。前部付属肢の化石のみによって知られる。 (ja)
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