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Donovaniconus

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Journal Article

New Pennsylvanian coleoids (Cephalopoda) from Nebraska and Iowa, USA Available to Purchase

Royal H. Mapes, Larisa A. Doguzhaeva
Published: 18 October 2017
Journal of Paleontology (2018) 92 (2): 146–156.
DOI: https://doi.org/10.1017/jpa.2017.79
... described as Pabianiconus starkensis new genus new species , Nebraskaconus whitei new genus new species, and Starkites compressus new genus new species. One specimen that is missing most of the phragmocone, is provisionally assigned to Donovaniconus . The fossils are assigned to the Coleoidea because...
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View PDF for article title, New Pennsylvanian coleoids (Cephalopoda) from Nebraska and Iowa, USA
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Journal Article

A new late Carboniferous coleoid from Oklahoma, USA: implications for the early evolutionary history of the subclass Coleoidea (Cephalopoda) Available to Purchase

Larisa A. Doguzhaeva, Royal H. Mapes
Published: 04 December 2017
Journal of Paleontology (2018) 92 (2): 157–169.
DOI: https://doi.org/10.1017/jpa.2017.81
... rounded ventral side distinguish this genus from Donovaniconus Doguzhaeva, Mapes, and Mutvei, 2002b. The muscular mantle is preserved as a dense sheet-like structure, with a crisscross pattern and a globular-lamellar ultrastructure. Recent knowledge on the early to late Carboniferous coleoids is discussed...
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View PDF for article title, A new late Carboniferous coleoid from Oklahoma, USA: implications for the early evolutionary history of the subclass Coleoidea (Cephalopoda)
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Image
(1–3) Pabianoconus starkensis n. gen. and n. sp. (1) Overall view of holotype UNSM 16568A showing body chamber with external shell containing an ink-filled sac (is) in the body chamber (bc) and the partly complete breviconic phragomocone (ph) with aligned circular septal necks; (2) enlargement of a striated brown layer on the surface of the shell that is interpreted as the remains of the mantle tissue; (3) enlargement of the septal necks (is) that form a ring probably because of deposits around the cyrtochonanitic septal necks. Donovaniconus sp. (4, 5) Specimen UMSN 62497A (part) and diagram of the specimen, respectively; (4) overall view showing the impression of the animal’s relatively long, parallel-sided body chamber (bc) with a three-dimensional, ink-filled sac (is), and a partly complete phragmocone with remains of several closely spaced septa including the terminal septum (ts); (5) diagram of the faint body chamber impression and the partly complete breviconic phragmocone, the latter of which has the upper (dorsal?) edge preserved as a faint impression, and on the lower (ventral?) side as a thin strip of shell material; the earliest part of the shell is not preserved; (6) specimen UMSN 62497B (counterpart) showing the impression of the parallel-sided body chamber (bc) with an ink-filled sac (is) impression and a partly complete phragmocone (ph); the apical end of the ink-filled sac has a greater diameter than the restricted orad end; also note that the ink sac is placed about midway in the body chamber. Scale bars are 5 mm.

( 1 – 3 ) Pabianoconus starkensis n. gen. and n. sp. ( 1 ) Overall view o... Available to Purchase

Published: 18 October 2017
; ( 2 ) enlargement of a striated brown layer on the surface of the shell that is interpreted as the remains of the mantle tissue; ( 3 ) enlargement of the septal necks (is) that form a ring probably because of deposits around the cyrtochonanitic septal necks. Donovaniconus sp. ( 4, 5 ) Specimen UMSN