NAUTILOIDS WITH MULTIPLE PAIRED MUSCLE SCARS FROM LOWER–MIDDLE ORDOVICIAN OF BALTOSCANDIA

@article{Krger2005NAUTILOIDSWM,
  title={NAUTILOIDS WITH MULTIPLE PAIRED MUSCLE SCARS FROM LOWER–MIDDLE ORDOVICIAN OF BALTOSCANDIA},
  author={Bj{\"o}rn Kr{\"o}ger and Harry Mutvei},
  journal={Palaeontology},
  year={2005},
  volume={48}
}
Abstract:  The number, outline and arrangement of muscle scars on the internal mould of the body chamber of five species of Early and Middle Ordovician nautiloids from Baltoscandia are described. The ellesmeroceratids Oelandoceras haelluddenense Foerste and Pictetoceras oliviae King have 9–10 pairs of muscle scars. The oncoceratid Phtanoncoceras ellipticum (Lossen), and Botellusoceras torpense gen. et sp. nov., order and family indeterminate, have eight and nine pairs of muscle scars… 
Siphuncular structure in the orders Tarphycerida and Barrandeocerida (Cephalopoda: Nautiloidea)
Abstract:  The siphuncular structure is described in two Silurian taxa, Boionautilus tyrannus and Cumingsoceras complanatus, currently placed in the Tarpycerida. Tarphycerids have the Nautilus type
Muscle scars in euomphaline gastropods from the Ordovician of Baltica
  • J. S. Peel
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A discrete pair of muscle scars is described for the first time on the umbilical wall of the open-coiled, hyperstrophic ophiletoidean gastropod Asgardispira, a close relative of the widely distribu
Early growth‐stages and classification of orthoceridan Cephalopods of the Darriwillian (Middle Ordovician) of Baltoscandia
Five apices of orthoceridan cephalopods from the early Middle Ordovician Holen Limestone of Oland, Sweden that where collected in the late 19th Century by G. Holm provide information on cephalopod
EARLY ORTHOCERATOID CEPHALOPODS FROM THE ARGENTINE PRECORDILLERA (LOWER–MIDDLE ORDOVICIAN)
Abstract The Early and Middle Ordovician Orthocerida and Lituitida of Precordilleran Argentina are described, and their systematics and paleogeographic significance are revised. These cephalopods
SOME LESSER KNOWN FEATURES OF THE ANCIENT CEPHALOPOD ORDER ELLESMEROCERIDA (NAUTILOIDEA, CEPHALOPODA)
TLDR
The shape of the body chamber and of the soft body attachment structures has led to a reconstruction of an ellesmeroceratid soft body that is organized like a primitive conchiferan mollusc, and a tryblidian cephalopod ancestor is supported.
Siphuncular structure in Silurian discosorid and ascocerid nautiloids (Cephalopoda) from Gotland, Sweden: implications for interpretation of mode of life and phylogeny
The connecting ring structure is studied in the discosorids Phragmoceras and Trimeroceras, as well as in the ascocerid Choanoceras. These taxa have the Nautilus type of connecting rings, composed of
Revision of annulated orthoceridan cephalopods of the Baltoscandic Ordovician
TLDR
It is shown that the present knowledge is not sufficient to establish an unequivocal classification of the Middle, and Late Ordovician annulate cephalopods and that the families Kionoceratidae, and Leuroceratidae must be refused because they represent not natural groups.
High-level classification of the nautiloid cephalopods: a proposal for the revision of the Treatise Part K
TLDR
The scheme proposed here utilizes the form of muscle attachment scars as a diagnostic feature at subclass level; other features (including siphuncular structures and cameral deposits) are employed at ordinal level; this scheme has the advantage of relative simplicity and presents a balanced approach which reflects the considerable morphological diversity and phylogenetic longevity of the nautiloid cephalopods.
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