Om mynningen hos Lituites Breyn

Lituitid cephalopods from the Middle Ordovician of Bohemia and their paleobiogeographic affinities

“…Weak dorso-lateral sinuses develop on the sculpture later in growth. Adult diameter of the shell varies between 27 and 50 mm (compiled from Remelé 1880aRemelé , b, 1890Noetling 1882 andHolm 1891).…”

“…The annuli are very fine adapically (less than 1 mm apart) and gradually become coarser with ontogeny (2.7 mm apart in adult stages). (For further description and discussion see Holm 1891 andSweet 1958. ) The preserved part of the sub-adult individual from Bohemia corresponds to the diagnosis and published illustrations of T. discors (Sweet 1958).…”

Taxonomy and ontogeny of the Lituitida (Cephalopoda) from Orthoceratite Limestone erratics (Middle Ordovician)

“…Because of these problems, we use the full set of characters (see below) here for the taxonomic treatment of the material. Most species of Baltoscandian lituitids were described in the second half of the 19 th century (e.g., Boll 1857;Angelin 1880;Dewitz 1880;Remelé 1880Remelé , 1882Remelé , 1890Holm 1891;Hyatt 1894) and are often known only from unrevised type collections. Some detailed taxonomic works on Baltoscandian lituitids were published later (Foerste 1930;Balashov 1953;Sweet 1958;Furnish & Glenister 1964;Dzik 1984;Aubrechtová & Meidla 2020), while numerous lituitid taxa were described from other regions, especially China (e.g., Lai 1965Lai , 1986Qi 1980;Fang et al 2017).…”

“…Along with photographs, we have reproduced illustrations of some of the specimens described by Angelin (1880), Noetling (1882Noetling ( , 1884, Remelé (1890), Holm (1891) and Dzik (1984) because these are very accurate and show additional details of the conch morphology. Ebbestad & Högström (2007) and Meidla et al (2014); stage slices after Bergström et al (2009).…”

“…Rhynchorthoceras angelini is, together with R. conicum, by far the most abundant representative of Rhynchorthoceras in the Aserian and Lasnamägian (Middle Ordovician) strata of Baltoscandia and erratics in Germany and Poland. Most of the reported occurrences come from the Upper Red Orthoceratite Limestone, where R. angelini co-occurs with Trilacinoceras discors (Holm, 1891) and possibly other lituitids (e.g., Jaanusson 1960). The species is palaeogeographically widespread and stratigraphically long-ranging compared to other species of the genus; it probably occurs already in the latest Dapingian (early Middle Ordovician) rocks of central Bohemia (Marek 1999;Manda 2008;Aubrechtová & Turek 2018).…”