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Showing results for tags 'orthocerida'.
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A nice Dictyonema flabelliforme dendroid graptolite from Oslo Fields in Norway. It's Tremadoc, Lower Ordovician in age and is thus maybe around 480 mya. Another angle :
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From the album: MY FOSSIL Collection - Dpaul7
Lituites Fossil China TIME PERIOD: late Ordovician Period (445-458 Million Years ago) Data: Lituites is an extinct nautiloid genus from the Middle Ordovician and type for the Lituitidae (a tarphycerid family) that in some more recent taxonomies has been classified with the orthocerids and listed under the order Lituitida. it's now considered widespread, Fossils have been found in New York, Argentina, Norway, Sweden, Estonia, and China. Lituites produced a shell with a planospirally coiled juvenile portion at the apex, reflective of its tarphycerid ancestry, followed by a long, moderately expanding, generally straight, orthoconic adult section with a subdorsal siphuncle connecting the chambers. The adult body chamber may equal or exceed the length of the chambered part of the orthoconic section. The mature aperture has a pair of pronounced ventrolateral lappets and a similar but shorter pair of dorsolateral lappets. Lituites gives its name to the term "lituiticone" which refers to a shell that is coiled in the early growth stage and later becomes uncoiled. Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Order: †Orthocerida Family: †Lituitidae Genus: †Lituites-
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