Jurassicz1 Posted October 27, 2020 Share Posted October 27, 2020 Anybody knows the species of this orthoceras? It was found in kinnekulle sweden. Lower ordovician if im not wrong. Its 4 cm Link to comment Share on other sites More sharing options...
Johannes Posted October 27, 2020 Share Posted October 27, 2020 We need good pictures of the distal end of the living chamber.... Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted October 27, 2020 Share Posted October 27, 2020 Yes, Orthoceras is not present in Kinnekulle, as far as I'm aware, though I thought my specimens from there are Middle Ordovician if I recall correctly. But other members of the Orthocerida are present as well as members of the Endocerida. If the siphuncle is central it's Orthocerida, on the margin and it's Endocerida. 1 Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
Jurassicz1 Posted October 29, 2020 Author Share Posted October 29, 2020 On 10/27/2020 at 4:58 PM, Tidgy's Dad said: Yes, Orthoceras is not present in Kinnekulle, as far as I'm aware, though I thought my specimens from there are Middle Ordovician if I recall correctly. But other members of the Orthocerida are present as well as members of the Endocerida. If the siphuncle is central it's Orthocerida, on the margin and it's Endocerida. Alright! Thanks i will post a picture later:) Link to comment Share on other sites More sharing options...
Jurassicz1 Posted November 3, 2020 Author Share Posted November 3, 2020 On 10/27/2020 at 9:45 AM, Johannes said: We need good pictures of the distal end of the living chamber.... Hope these are better Link to comment Share on other sites More sharing options...
Johannes Posted November 7, 2020 Share Posted November 7, 2020 Your cephalopod find remember me a comparable find I have made in the swedish Ordovician (reg. the trace fossils in the living chamber) published by Grimmberger in 2016 (Archiv für Geschiebekunde 7 (6), S. 369-399). Link to comment Share on other sites More sharing options...
Johannes Posted November 7, 2020 Share Posted November 7, 2020 You can see, like in your find, there is a slight tightening in the end of the living chamber... If you have a slightly good preservation you can find two apikal impressions there: Link to comment Share on other sites More sharing options...
Johannes Posted November 7, 2020 Share Posted November 7, 2020 There is a feature in your find you can see: the near to middle position of the small sized siphuncle of your piece which is characteristic (like the Ornamantation fragments with a small pathologic shell area of my find, which is an Orthoceras regulare SCHLOTHEIM, 1820). This points to Orthoceras regulare SCHLOTHEIM, 1820 and I would say more to Middle Ordovician than Lower Ordovician for your find, too. You can compare those features/you piece with Fig. 35 in Dzik 1984 Phylogeny of the Nautiloidea... edit: @Tidgy's Dad Orthoceras is present at Kinnekulle. 2 Link to comment Share on other sites More sharing options...
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