File:Robsonoceras robsonense (Walcott 1924) type material.jpg

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English: Type material of the ellesmerocerid cephalopod Robsonoceras robsonense (Walcott, 1924), orig. comb. Ellesmeroceras robsonensis, from the Lower Ordovician Chushina Formation of southeastern British Columbia, Canada. All specimens are preserved as internal molds. 1a) and b) two different views of specimen United States National Museum (USNM) 69803 (lectoparatype), a partial phragmocone and living chamber. 2b) specimen USNM 69804 (lectoparatype), a partial phragmocone and living chamber, 2a) is the corresponding cross section. 3) ventral view of specimen USNM 69805 (lectoparatype), a partial phragmocone with well visible siphuncle and living chamber. 4b) ventral view of specimen USNM 69806 (lectoholotype), a partial phragmocone with well visible siphuncle, 4a) is the corresponding cross section.
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Source Plate 126 (hosted on Commons as Smithsonian miscellaneous collections (1924) (14577490287).jpg) in: Cambrian and Ozarkian Brachiopoda, Ozarkian Cephalopoda and Notostraca. Pp. 477–555 in: Cambrian Geology and Paleontology IV. Smithsonian miscellaneous collections 67.
Author Charles D. Walcott (1850–1927)

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current03:42, 8 October 2018Thumbnail for version as of 03:42, 8 October 20181,812 × 2,016 (1.24 MB)Gretarsson (talk | contribs){{Information |description ={{en|1=Type material of the ellesmerocerid cephalopod ''Robsonoceras robsonense'' ({{small caps|Walcott}}, 1924), orig. comb. ''Ellesmeroceras robsonensis'', from the Lower Ordivician Chushina Formation of southeastern British Columbia, Canada, all specimens are preserved as internal molds. 1a) and b) two different views of specimen United States National Museum (USNM) 69803 (lectoparatype), a partial phragmocone and living chamber. 2a) specimen USNM 69804 (lecto...

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