Agnostus

Agnostus

 genus of trilobites (an extinct group of aquatic arthropods) found as fossils in rocks of Early Cambrian to Late Ordovician age (those deposited from 540 to 438 million years ago). The agnostids were generally small, with only two thoracic segments and a large tail segment. Agnostus itself was only about 6 millimetres (0.25 inch) long and lacked eyes. The similarity of the anterior and posterior regions frequently makes the agnostids difficult to differentiate.

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  • agnostus — agnòstus m DEFINICIJA geol. zool. malen trilobit (Agnostus); živio u kambriju i siluru ETIMOLOGIJA nlat …   Hrvatski jezični portal

  • Agnostus — Agnostides Agnostus pi …   Wikipédia en Français

  • Agnostus — Taxobox name = Agnostus fossil range = fossil range|Early Cambrian|Early Silurian regnum = Animalia phylum = Arthropoda classis = Trilobita ordo = Agnostida familia = Agnostidae genus = Agnostus genus authority = Brongniart 1822Agnostus is a… …   Wikipedia

  • Agnostus — Agnos|tus der; , Plur. ...ti u. ...ten <aus nlat. agnostus »der Unbekannte«, dies aus gleichbed. gr. ágnōstos> ausgestorbene Gattung der Dreilappkrebse (vgl. ↑Trilobit) aus dem ↑Paläozoikum …   Das große Fremdwörterbuch

  • Agnostus pisiformis — Darstellung aus Kunstformen der Natur (Haeckel, 1904), auf Tafel 47 Zeitraum Mittel bis Oberkambrium 500 bis 488,3 Mio. Jahre Fundorte Europa …   Deutsch Wikipedia

  • agnostus — ag·nos·tus …   English syllables

  • agnostus — təs noun Usage: capitalized Etymology: New Latin, from Greek agnōstos unknown : a genus of small blind Cambrian and Ordovician trilobites that with a number of related forms in which the cephalon and pygidium are almost indistinguishable… …   Useful english dictionary

  • Kambrische Formation — (hierzu Tafel »Kambrische Formation«), nach ihrem Vorkommen in Cambria, dem heutigen Wales, 1833 von Sedgwick und Murchison benannte versteinerungsführende, alte Sedimentärgebilde, welche die kristallinischen Schiefer der Huronischen Formation (s …   Meyers Großes Konversations-Lexikon

  • Agnostoidea — Agnostina Ptychagnostus cuyanus Zeitraum Unteres Kambrium bis Oberes Ordovizium Fundorte Weltweit Sy …   Deutsch Wikipedia

  • Condylopygoidea — Agnostina Ptychagnostus cuyanus Zeitraum Unteres Kambrium bis Oberes Ordovizium Fundorte Weltweit Sy …   Deutsch Wikipedia

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