Dalecarlioceras dalecarlicum ( Frye, 1987 ) Kröger, 2013
publication ID |
https://doi.org/ 10.5852/ejt.2013.41 |
publication LSID |
lsid:zoobank.org:pub:A2F1B9ED-870A-466E-B35E-BD5DA782476E |
DOI |
https://doi.org/10.5281/zenodo.3815220 |
persistent identifier |
https://treatment.plazi.org/id/AD4D9054-CD73-6A71-F3B6-469CFD49F8E8 |
treatment provided by |
Carolina |
scientific name |
Dalecarlioceras dalecarlicum ( Frye, 1987 ) |
status |
comb. nov. |
Dalecarlioceras dalecarlicum ( Frye, 1987) comb. nov.
Fig. 7B View Fig
Cyrtorizoceras dalecarlicum Frye, 1987: 88 , 89, fig. 6d-f.
Emended diagnosis
Dalecarlioceras with slightly curved adult body chamber, with maximum adult height/width of ca. 40/ 38 mm, and adult peristome height/width 37/33.
Holotype
PMU 24774 .
Type locality and horizon
Kallholn, Siljan District, Sweden, Boda Limestone, Boda Core Member, late Katian, Ordovician.
Other material examined
One specimen ( PMU 24775) from Kallholn, Dalarna; one specimen from Rättvik, Dalarna, NRM Mo 150043, Boda Limestone, Boda Core Member, late Katian.
Description
See Frye (1987: 88-89) for a detailed description.
Remarks
Dalecarlioceras is endemic to the Boda Limestone. Originally, two species were assigned to this genus: the large D. bodense , characterized by a high angle of expansion, and the somewhat smaller, more slender D. constrictum Frye, 1987 ( Fig. 7A View Fig ). Herein, the medium sized Cyrtorizoceras dalecarlicum Frye, 1987 is considered an additional species of Dalecarlioceras . Dalecarlioceras dalecarlicum ( Frye, 1987) comb. nov. has an only slightly curved adult body chamber, combined with a slightly irregularly spaced ornamentation with transverse growth lines similar to those of D. bodense . The mature body chamber of D. dalecarlicum comb. nov. differs from that of Cyrtorizoceras in having a nearly straight, or slightly concave outline in lateral view ( Fig. 7 View Fig B-C); it is clearly compressed at the aperture in frontal view. Consequently, the body chamber of D. dalecarlicum comb. nov. is widest approximately at mid-length, like in D. bodense . D. dalecarlicum comb. nov. is considered to represent a transitional form between D. constrictum and Cyrtorizoceras thorslundi sp. nov. Together these forms represent a transition from the relatively small and slender C. thorslundi sp. nov., with a weakly gibbous body chamber, toward the massive, and strongly gibbous D. bodense . This suggests an ancestry or close relationship of Dalecarlioceras to Cyrtorizoceras .
Stratigraphic and geographic range
Boda Limestone, Dalarna, Sweden; late Katian.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Genus |
Dalecarlioceras dalecarlicum ( Frye, 1987 )
Kröger, Björn 2013 |
Cyrtorizoceras dalecarlicum
Frye M. W. 1987: 88 |