词条 | Tariccoia |
释义 |
| name = Tariccoia arrusensis | fossil_range = {{fossilrange|444|461|Upper Ordovician}} | image = Tarricoia collectie Paul Hille.jpg | image_caption = Tariccoia arrusensis, 21 mm, from Sardegna, Italy | regnum = Animalia | phylum = Arthropoda | ordo = †Nektaspida | familia = †Liwiidae | genus = †Tariccoia | species = †T. arrusensis | binomial = Tariccoia arrusensis | binomial_authority = Hammann, 1990 }} Tariccoia is a genus of small to average size (between {{convert|2.5|cm|in}} and {{convert|6|cm|in}} long) marine arthropods in the Liwiidae Family, that lived during the late Ordovician period.[1] Fossil remains of Tariccoia were collected from Sardinia, Italy. Tariccoia looks like a large, soft agnostid trilobite. It has a headshield (or cephalon) wider than the tailshield (pygidium), and in between them three (or four?) thoracic body segments (somites). The genus is monotypic, its sole species being Tariccoia arrusensis. EtymologyThe name of the genus references the Sardinian paleontologist M. Taricco. The species was named after the Riu is Arrus Member, the deposit in which it was found.[1] DescriptionTariccoia arrusensis is between 2.5 and 6 cm along the axis,[2] almost half a wide as long. The dorsal exoskeleton consists of a cephalon, a pygidium and two or three thoracic somites with articulating half-rings, all non-calcified. The cephalon is sub-semicircular, widest near the rounded genal angles. The cephalon is wider than the pygidium. Eyes are absent. Antennas are not known. The body is constricted at the two or three thoracic somites, so the animal gives the impression to have a waist. The pygidium is widest before midlength. The pygidium has a mid-ridge.[1]Differences with other Liwiidae
DistributionT. arrusensis has been collected from the Upper Ordovician (Sandbian to Katian) Riu is Arrus Member, Monte Argentu Formation, Sardinia, Italy.[1]HabitatTariccoia arrusensis was probably a marine bottom dweller. References1. ^1 2 3 {{cite journal |author=W. Hammann, R. Laske & G. L. Pillola |year=1990 |title=Tariccoia arrusensis n. g. n. sp., an unusual trilobite-like arthropod. Rediscovery of the "phyllocarid" beds of Taricco (1922) in the Ordovician "Puddinga" sequence of Sardinia |journal=Bolletino della Societa Palaeontologica Italiana |volume=29 |pages=163–178}} {{Taxonbar|from=Q7686010}}2. ^L. Ramskold, J.-Y. Chen, G.D. Edgecombe, and G.-Q. Zhou ( 1996). Preservational folds simulating tergite junctions in tegopeltid and naraoiid arthropods. Lethaia 29:15-20.{{ISSN|0024-1164}}. 3. ^{{cite book |author=E. Bonino & C. Kier |year=2010 |title=The Back to the Past Museum Guide to Trilobites |pages=18–19, fig. 9}} 5 : Nektaspida|Ordovician arthropods|Fossils of Italy|Animals described in 1990|Katian |
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