Hoploscaphites Nowak, 1911

KENNEDY, W. J., LANDMAN, N. H., COBBAN, W. A. & JOHNSON, R. O., 2000, Additions to the Ammonite Fauna of the Upper Cretaceous Navesink Formation of New Jersey, American Museum Novitates 3306, pp. 1-31 : 18-20

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
status

 

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.

Kingdom

Animalia

Phylum

Mollusca

Class

Cephalopoda

Family

Scaphitidae

Loc

Hoploscaphites Nowak, 1911

KENNEDY, W. J., LANDMAN, N. H., COBBAN, W. A. & JOHNSON, R. O. 2000
2000
Loc

Jeletzkytes

Riccardi 1983
1983
Loc

Hoploscaphites pumilus

Stephenson, Cobban 1974: 16
1974
Loc

Scaphites pumilus

Stephenson 1941: 426
1941
Loc

Discoscaphites erucoides

Stephenson 1941: 429
1941
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