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Panlongia

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Panlongia
Temporal range: lowest Botomian PreꞒ Ꞓ O S D C P T J K Pg N ↓
Panlongia spinosa
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Artiopoda
Order: Incertae sedis
Family: Incertae sedis
Genus: Panlongia
Liu et al., 2006
Species
  • P. tetranodusa Liu et al. 2006
  • P. spinosa Liu et al. 2006

Panlongia was a small-sized (up to 2 cm) marine arthropod, with an oval-shaped non-calcified exoskeleton. Both the head shield (or cephalon) and the tail shield (or pygidium) are semi-circular. In between the cephalon and pygidium are four thoracic body segments (somites). The cephalon occupies approximately ⅓ of the body length, the thorax ¼ and pygidium about 45%. Panlongia lived during the late Lower Cambrian (Botomian) in what is today South China. In Panlongia spinosa the edge of the exoskeleton carries several small sawtooth-like spines, that are absent in P. tetranodusa.

Distribution

  • Panlongia spinosa is found in the late Lower Cambrian (Botomian) of China (Wulongqing Formation, only at Gaoloufang Kgs-2).
  • Panlongia tetranodusa occurs in the late Lower Cambrian (Botomian) of China (Wulongqing Formation, Gaoloufang Kgs-1, and Shijiangjun Wsh-14, Wuding County, Yunnan, "Guanshan fauna").

Taxonomy

The phylogenetic position of Panlongia remains uncertain, because the appendages remain unknown sofar. Panlongia cannot yet with confidence be assigned to the Helmetiida or the Nektaspida, as was initially suggested.

Ecology

Panlongia tetranodusa occurs with the coeloscleritophoran Allonia sp., the vetulicolian Vetulicola gangtoucunensis, lingulate brachiopods Lingulellotreta malongensis, Diandongia pista, Acrothele rara, and Westonia gubaiensis; dinocaridid Houcaris saron, hyolith Linevitus malongensis, eocrinoid Wudingeocrinus rarus, Trilobites Redlichia yunnanensis, R. mansuyi, R. noetlingi, R. conica, R. shijiangjunensis, Palaeolenus douvillei, and P. lantenoisi; crustaceans: Tuzoia sinensis, T. tylodesa, Branchiocaris sp., Liangshanella liangshanensis, and Neokunmingella sp., and several other arthropods like Longquania bispinosa, Guangweicaris spinatus; Leanchoilia illecebrosa, Isoxys minor, I. wudingensis and Gangtoucunia aspera.

See also

References

  1. ^ Liu, Q.; Luo, H.-L.; Chen, L.-Z.; Lu, S.-X. (2006). "Panlongia, a new trilobitomorph genus from the Lower Cambrian, Kunming, Yunnan". Acta Palaeontologica Sinica. 45: 384–392.
  2. John R. Paterson; Gregory D. Edgecombe; Diego C. García-Bellido; James B. Jago & James G. Gehling (2010). "Nektaspid arthropods from the Lower Cambrian Emu Bay Shale Lagerstätte, South Australia, with a reassessment of lamellipedian relationships" (PDF). Palaeontology. 53 (Part 2): 377–402. doi:10.1111/j.1475-4983.2010.00932.x.
Taxon identifiers
Panlongia
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