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Solenoceras reesidei Stephenson 1941 from: Ifrim, C..Stinnesbeck, W..López-Oliva, J.G.. (2004): Maastrichtian cephalopods from Cerralvo, north-eastern Mexico . Palaeontology Vol. 47(6) p. 1575–1627
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Species Solenoceras reesidei Stephenson 1941

[1] Text-fig. 15a-e Ifrim et al. (2004)

Diagnosis / Definition:
Ifrim et al. (2004):
Description: U-shaped and straight shell fragments with low to intermediate expansion rates. Cross section of the test is oval. The cross section of the juvenile limb is rounded to compressed with ventrolateral shoulders and a narrow bow towards the dorsum. The dorsum of the more adult limb is concavely grooved and contains the juvenile shaft with rounded to triangular cross section. The test is ornamented with prominent simple ribs, with a rib index of c. 7. They are straight and retracted towards the venter. Faint pairs of tubercles are present on the venter of two specimens. The suture line is visible in part and very simple.
Discussion / Comments:
Ifrim et al. (2004):
Remarks: Ribs are more densely arranged than in S. texanum (Shumard, 1861), and the cross section ofthe smaller limb is more circular. The shell expands at a slightly faster rate which leads to astronger difference in diameter between the juvenile and adult limb at comparable distances from the hook. Solenoceras annulifer (Morton, 1841) and S. multicostatum (Stephenson, 1941) have finer ornament and depressed reniform sections up to the adult shaft.ln comparison to S. multicostatum (Stephenson, 1941) both limbs of S. reesidei are pressed onto each other more narrowly. Occurrence: Solenoceras reesidei Stephenson is restricted to the northern Gulf of Mexico area and the Interior Seaway of the USoIt was recorded from the Upper Campanian Baculites compressus and Baculites reesidei zones of the Pierre Shale, Colorado (Cobban et al. 1992), the Upper Campanian Coon Creek Tongue of the Ripley Formation in Tennessee (Cobban and Kennedy 1993a), and the Navarro Formation of Texas (Stephenson 1941; Cobban and Kennedy 1991a). Solenoceras sp. was recorded from the Potrerillos Formation (Difunta Group, north-eastern Mexico) and the Cardenas Formation (east-central Mexico), but specimens were not figured or described (Vega et al. 1995).
Synonym list:
Ifrim et al. (2004):
1941 Solenoceras reesidei Stephenson. - Stephenson : p.399 pl. 77, figs. 4-5; pl. 79, figs. 1-4
1992 Solenoceras reesidei Stephenson. - Cobban et al. : A6 pl. 1, figs. 18-22; text-figs. 6
1993 Solenoceras reesidei Stephenson. - Cobban & Kennedy : B6 pl. 7, figs. 1-9, 11-12, 14-15, 18-25
2004 Solenoceras reesidei Stephenson. - Ifrim et al. : p.36 text-figs. 15a-c
Stratigraphy - relative ages:
upper Campanian: Ifrim et al. (2004)

Stephenson,L.W.. (1941):
The larger invertebrates of the Navarro Group of Texas (exclusive of corals and crustaceans and exclusive of the fauna of the Escondido Formation) . University of Texas, Bulletin Vol. 4101 p. 641 pp

Cobban,W.A..; Kennedy,W.J.. and SCOTT,G.R.. (1992):
Upper Cretaceous ammonites from the Baculites compressus Zone of the Pierre Shale in north-central Colorado. . United States Geological Survey, Bulletin Vol. 2024 p. A1-A11

Cobban,W.A.. and Kennedy,W.J.. (1993):
Upper Cretaceous ammonites from the Coon Creek Tongue of the Ripley Formation at its type locality in McNairy County, Tennessee . United States Geological Survey, Bulletin Vol. 2073 p. B1-B12

Ifrim,C..; Stinnesbeck,W.. and López-Oliva,J.G.. (2004):
Maastrichtian cephalopods from Cerralvo, north-eastern Mexico . Palaeontology Vol. 47(6) p. 1575–1627

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