Tematica Animali preistorici

Triplagnostus sp.

Phylum: Arthropoda Latreille, 1829

Subphylum: Arachnomorpha Heider, 1913

Classe: Artiopoda Hou & Bergström, 1997

Ordine: Agnostida Salter, 1864

Famiglia: Ptychagnostidae Kobayashi, 1939

Genere: Triplagnostus Howell 1935

Specie e sottospecie

Il genere annovera attualmente le seguenti specie: Ptychagnostus acidusus Opik 1979 - Ptychagnostus aculeatus Angelin 1851 - Ptychagnostus aksayensis Ergaliev and Ergaliev 2008 - Ptychagnostus atavus Tullberg 1880 - Ptychagnostus convexus Westergard 1946 - Ptychagnostus cuyanus Rusconi 1948 - Ptychagnostus intermedius Tullberg 1880 - Ptychagnostus karatauensis Ergaliev 1980 - Ptychagnostus leptus Qian 1983.

Descrizione

Genere di trilobiti ciechi, generalmente non superano i dieci mm.

Diffusione

Visse durante il Cambriano.

Sinonimi

= Acidusus Opik, 1979 = Aotagnostus Opik, 1979 = Aristarius Opik, 1979 = Canotagnostus Rusconi, 1951 = Huarpagnostus Rusconi, 1950 = Pentagnostus Lermontova, 1940 = Solenagnostus Whitehouse, 1936 = Triplagnostus Linnarsson, 1869 = Zeteagnostus Opik, 1979.

Bibliografia

–Samuel M. Gon III. "Agnostida Fact Sheet". A Guide to the Orders of Trilobites.
–Brian D. E. Chatterton, Desmond H. Collins & Rolf Ludvigsen (2003). "Cryptic behaviour in trilobites: Cambrian and Silurian examples from Canada, and other related occurrences". In Philip D. Lane, Derek J. Siveter & Richard A. Fortey (ed.). Trilobites and their Relatives: contributions from the third international conference, Oxford 2001. Special Papers in Palaeontology. Vol. 70. pp. 157-173.
–Coppold, Murray and Wayne Powell (2006). A Geoscience Guide to the Burgess Shale, p.56. The Burgess Shale Geoscience Foundation, Field, British Columbia.
–BRØGGER W. C. 1878. Om paradoxides-skifrene ved Krekling. Nyt Magazin for Naturvidens-kaberne 24, 18-88.
–LAURIE J. R. 2008. Species relationships in the Ptychagnostidae (Cambrian, Agnostina). In: Ra´bano I., Gozalo R. & Garcia Bellido D. eds. Advances in trilobite research, pp. 211-218. Cuadernos del Museo Geominero 9.

	Data: 02/04/1990 Emissione: Fossili Stato: British Antarctic Territory