Hoploscaphites Nowak, 1911
publication ID |
https://doi.org/ 10.1206/0003-0082(2000)306<0001:ATTAFO>2.0.CO;2 |
persistent identifier |
https://treatment.plazi.org/id/292A1679-FFDB-FFA6-FD7A-FAD7FCEAFF05 |
treatment provided by |
Felipe |
scientific name |
Hoploscaphites Nowak, 1911 |
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Genus Hoploscaphites Nowak, 1911 View in CoL
TYPE SPECIES: Ammonites constrictus J. Sowerby, 1817, p. 189 , pl. A, fig. 1, by original designation .
Hoploscaphites pumilus (Stephenson, 1941)
Figure 9A–F View Fig
Scaphites pumilus Stephenson, 1941: 426 , pl. 90, figs. 10–12.
Discoscaphites erucoides Stephenson, 1941: 429 , pl. 91, figs 2–4.
Hoploscaphites pumilus Stephenson, Cobban, 1974a: 16 , pl. 11, figs. 9–12, textfig. 13.
Hoploscaphites pumilis View in CoL (sic) Stephenson, 1941, Kennedy, 1986c: 1018, pl. 5, figs. 18–20.
Hoploscaphites pumilis (sic) Stephenson, 1941, Kennedy and Cobban, 1993: 426, figs. 9.3, 9.6, 12.5, 16.1–16.26, 17.1–17.21.
Hoploscaphites pumilus (Stephenson, 1941) , Kennedy et al., 1995: pl. 6, figs. 1, 2.
TYPE: The holotype, by original designation, is USNM 21041 About USNM , the original of Stephenson, 1941: pl. 90, figs. 10–12, from the Nacatoch Sand in the vicinity of Chatfield , Navarro County, Texas .
DESCRIPTION: MAPS A2032a1 (fig. 9A, B) is the most complete specimen. It is a microconch 44.0 mm long. The phragmocone is fairly involute with a small, deep umbilicus. The whorl section at the ultimate septum is compressed (ratio of whorl breadth to whorl height is 0.74), with the greatest breadth at the umbilical shoulder. Primary ribs arise at the umbilical seam and strengthen across the umbilical wall. The ribs are straight and prorsiradiate on the inner flanks and increase by branching and intercalation on the outer flanks. All ribs are equally strong on the venter. Umbilicolateral and ventrolateral tubercles develop on the adoral part of the phragmocone. The body chamber is compressed (ratio of whorl breadth to whorl height at midshaft is 0.84) with a steep umbilical wall and nearly flattened flanks that converge to a broadly rounded venter. The flanks are covered with broad, poorly defined ribs. There are five umbilicolateral tubercles. The ventrolateral tubercles become stronger and more clavate on the adoral part of the shaft but weaken on the final hook.
DISCUSSION: These specimens supplement material described by Cobban (1974a). Tubercles are absent on the inner whorls of the phragmocone but develop on the outer whorls. This is a feature of the holotype, but is not visible on Stephenson’s figures. Small specimens differ in no significant respects from Discoscaphites erucoides Stephenson, 1941 (p. 429, pl. 91, figs. 2–4), which is here regarded as a synonym.
OCCURRENCE: Upper Campanian; lower phosphatic layer, basal part of Navesink Formation, Atlantic Highlands, New Jersey; Saratoga Chalk, Arkansas; Nacatoch Sand, Navarro County, Texas; Marnes de Plagne, Paillon, Haute Garonne, France; and Tercis, Landes, France.
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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Hoploscaphites Nowak, 1911
KENNEDY, W. J., LANDMAN, N. H., COBBAN, W. A. & JOHNSON, R. O. 2000 |
Jeletzkytes
Riccardi 1983 |
Hoploscaphites pumilus
Stephenson, Cobban 1974: 16 |
Scaphites pumilus
Stephenson 1941: 426 |
Discoscaphites erucoides
Stephenson 1941: 429 |