Cephalopoda

Discoceras antiquissimum (Eichwald, 1842)

Taxon description

Kröger & Aubrechtova, 2019

Diagnosis (after Furnish & Glenister 1964). Gradually expanding conchs with a ribbed or smooth shell surface, characterized by a slight to moderate whorl overlap, circular to subquadrate whorl cross section, central position of siphuncle in initial half-volution, marginodorsal in succeeding 1.5–2 whorls, subdorsal at maturity, and thick, layered connecting rings.

Synonymy list
1840     Clymenia antiquissima Eichwald 1840 (nomen nudum) — Eichwald, pp. 115
1842     Clymenia antiquissima — Eichwald, pp. 33, fig. 3:16, 17
1861     Lituites (Trocholites) antiquissimus — Schmidt, pp. 62, fig. 6:2a-g
1861     Lituites antiquissimus — Roemer, pp. 62, fig. 6:f-g
1869     Lituites antiquissimus — Karsten, pp. 52, fig. 19:7a-c
1885     Lituites antiquissimus — Karsten, pp. 68, fig. 4:12
1925     Discoceras antiquissimum — Foerste, pp. 17,58, fig. 18:1
1930     Discoceras antiquissimum (Eichwald, 1840) — Teichert, pp. 285
1934     Discoceras antiquissimum — Strand, pp. 32, fig. 2:4,11; 4:2,3; 13:9
1936     Discoceras antiquissimum — Thorslund, fig. 2:11
1953     Discoceras antiquissimum — Balashov, pp. 265, fig. 12:1a,b
1958     Discoceras antiquissimum — Sweet, pp. 99, fig. text fig. 13q
1958     Discoceras antiquissimum — Sweet, pp. 99, fig. text fig. 13q
1967     Discoceras antiquissima — Hucke & Voigt, pp. 58, fig. 15:1
1973     Discoceras antiquissimum — Neben & Krueger, fig. 77:24,25
1984     Discoceras antiquissimum — Dzik, pp. 42, fig. text fig. 9c-d; 12.39; 7:1
2013     Discoceras antiquissimum (Eichwald, 1842) — Kröger, pp. 72, fig. 31B
2017     Cylmenia antiquissima Eichwald, 1842 — Kröger & Aubrechtová, pp. 10
Selection of related publications
Kröger, B., Aubrechtová, M. 2018. Cephalopods from reef limestone of the Vasalemma Formation, northern Estonia (latest Sandbian, Upper Ordovician) and the establishment of a local warm-water fauna. Journal of Systematic Palaeontology 16, 10, 799-839. DOI:10.1080/14772019.2017.1347212
Stumbur, H. 1955. Eesti NSV ülem-ordoviitsiumi nautiloididest. Diplomitöö; 16 fototahvlit, materjali nimekiri Stumburi tööde kaustas, pp. 1-159.
Balashov, Z. G. 1953. Svernutye i polusvernutye nautiloidei ordovika Pribaltiki. Trudy Vsesoûznogo Naučno-Issledovatel'skogo Geologo-Razvedočnogo Instituta (VNIGRI) , 217-300. Stratigraphy and fauna of the Ordovician and Silurian West Russian Platform, pp. 217-300.
Teichert, C. 1930. Die Cephalopoden-Fauna der Lyckholm-Stufe des Ostbaltikums. Paläontologische Zeitschrift 12, 3/4, 264-312. DOI:10.1007/BF03044452