PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Volutoderma magna

Gastropoda - Neogastropoda - Volutidae

Taxonomy

Volutoderma magna was named by Packard (1922). Its type specimen is UCMP 12274 and is a 3D body fossil. Its type locality is UCMP loc. 2166, Santa Ana Mountains, which is in a Campanian marine horizon in the Ladd Formation of California.

Sister species lacking formal opinion data

V. appressa, V. rigida, V. tennesseensis

Year	Name and author
1922	Volutoderma magna Packard p. 432 figs. Plate 37, :figure 1
1958	Volutoderma magna Anderson p. 175
2008	Volutoderma magna Saul and Squires p. 231 figs. Figure 10.1–10.6

Reference	Diagnosis
E. L. Packard 1922	Shell elongate, rather slender; four or more whorls; pillar slightly oblique, without visible plaits; whorls of spire large, decreasing gradually in size; suture appressed; conspicuously shouldered in front of the suture on the last two whorls; body whorl large; outer lip expanded; aperture wide; spire apparently ornamented by spiral ridges which are indistinctly nodose on the penultimate whorl; body whorl ornamented by two equally prominent rows of nodes, numbering from 18 to 20, below which are two rows of less conspicuous nodes; below these in turn are at least seven evenly spaced slightly nodose ridges . Length of type, 95 mm.; maximum diameter of body whorl, 43 mm.
L. R. Saul and R. L. Squires 2008	Volutoderma with large strombiform shell, widely expanded outer lip, growth line strongly notched at suture, pos- terior notch defined by thick, vertical, U-shaped callus; spire high, pointed, with slender whorls and steep sutural slope; columella straight and heavily callused.

Time interval	Ma	Country or state	Original ID and collection number
Turonian - Santonian	93.9 - 83.6	USA (California)	Volutoderma magna (80941)
Campanian	83.6 - 72.2	USA (California)	Volutoderma magna (215345)
Late/Upper Campanian	83.6 - 72.2	USA (California)	Volutoderma averillii (219077) Volutoderma magna (type locality: 207828)
Middle Campanian - Late/Upper Campanian	83.6 - 72.2	USA (California)	Volutoderma magna (215264)
Maastrichtian	72.2 - 66.0	Mexico (Baja California)	Volutoderma magna (158099)