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Sphenodiscus lobatus

Cephalopoda - Ammonitida - Sphenodiscidae

Taxonomy
Ammonites lobata was named by Tuomey (1856) [DISTRIBUTION: Maastrichtian; Atlantic and Gulf Coastal Plain.]. It is not a trace fossil.

It was synonymized subjectively with Ammonites lenticularis by Kennedy (1986); it was recombined as Sphenodiscus lobatus by Hyatt (1903), Reyment (1955), Zaborski (1982), Zaborski (1985), Al-Harithi and Ibrahim (1992), Kennedy and Cobban (1996), Kennedy et al. (1997), Moneer et al. (2021).

Subspecies
Sphenodiscus lenticularis mississippiensis, Sphenodiscus lenticularis splendens
Sister species lacking formal opinion data
S. tirensis

Synonyms
Synonymy list
YearName and author
1852Ammonites lenticularis Owen p. 579
1856Ammonites lobata Tuomey p. 579 figs. pl. 8, fig. 5
1903Sphenodiscus lobatus Hyatt p. 66 figs. Pl. Vi, figs. 1, 2; Pl. VII, figs. 1, 2,; Pl. IX, figs. 11 - 13
1903Sphenodiscus lenticularis Hyatt pp. 71 - 72 figs. Pl. VIII, figs. 1, 2; Pl. IX, figs. 1 - 6
1928Sphenodiscus lenticularis Böse p. 293
1955Sphenodiscus lobatus Reyment p. 87 figs. Pl 22, figs 1a,b; text-fig 44
1982Sphenodiscus lobatus Zaborski p. 316 figs. 21, 24, 25
1985Sphenodiscus lobatus Zaborski p. 57 figs. 63-65
1986Sphenodiscus lenticularis Kennedy p. 176
1992Sphenodiscus lobatus Al-Harithi and Ibrahim p. 432 figs. Pl 1, fig 2; pl 2, fig 4
1996Sphenodiscus lobatus Kennedy and Cobban p. 802 figs. 2.4-2.6, 2.13, 2.14, 2.19-2.21
1997Sphenodiscus lobatus Kennedy et al. p. 4
2021Sphenodiscus lobatus Moneer et al. p. 3535 figs. 7A1, A2

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
phylumMollusca
classCephalopodaCuvier 1797
RankNameAuthor
subclassAmmonoidea()
orderAmmonitidaHaeckel 1866
suborderAmmonitinaHyatt 1889
superfamilyAcanthoceratoidea(de Grossouvre 1894)
familySphenodiscidae
genusSphenodiscusMeek 1871
specieslobatus(Tuomey 1856)

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

†Sphenodiscus lobatus Tuomey 1856
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Invalid names: Ammonites lenticularis Owen 1852 [replaced]
Diagnosis
No diagnoses are available
Measurements
partNmeanminimummaximummedians.d.
shell height658.431.475.466.715.8
shell diameter6104.751.8140.0120.331.1
shell inflation64.362.308.903.952.59

Composition: aragoniteo
Environment: marinec
Locomotion: fast-movingo
Life habit: nektonico
Diet: carnivoreo
Vision: well-developedc
Created: 2005-01-28 02:27:03
Modified: 2009-10-08 14:14:55
Source: o = order, c = class
References: Kiessling 2004, Kiessling 2003

Age range: base of the Late/Upper Campanian to the top of the Early/Lower Maastrichtian or 83.60000 to 66.00000 Ma

Collections (36 total)


Time interval Ma Country or state Original ID and collection number
Late/Upper Campanian83.6 - 72.2Nigeria Sphenodiscus lobatus (69626)
Late/Upper Campanian83.6 - 72.2Nigeria (Enugu) Sphenodiscus lobatus (82733)
Early/Lower Maastrichtian72.2 - 66.0USA (Maryland) Sphenodiscus lenticularis (125950)
Early/Lower Maastrichtian72.2 - 66.0Mexico (Nuevo Leon) Sphenodiscus lenticularis (88241 88242)
Early/Lower Maastrichtian72.2 - 66.0Mexico (Coahuila de Zaragoza) Sphenodiscus lenticularis (88243)
Early/Lower Maastrichtian72.2 - 66.0USA (Wyoming) Sphenodiscus lenticularis (1575)
Early/Lower Maastrichtian72.2 - 66.0Nigeria Sphenodiscus lobatus (69625)
Early/Lower Maastrichtian72.2 - 66.0USA (Mississippi) Sphenodiscus lenticularis (4105 4118)
Early/Lower Maastrichtian72.2 - 66.0Egypt Sphenodiscus lobatus (224160 224161)
Early/Lower Maastrichtian72.2 - 66.0USA (Alabama) Sphenodiscus lobatus (4255)
Early/Lower Maastrichtian72.2 - 66.0USA (New Jersey) Sphenodiscus lobatus (83067)
Late/Upper Maastrichtian72.2 - 66.0USA (Maryland) Sphenodiscus lobatus (4366 82399 82400 82403 82408)
Late/Upper Maastrichtian72.2 - 66.0USA (Texas) Sphenodiscus lenticularis (4536)
Late/Upper Maastrichtian72.2 - 66.0USA (South Carolina) Sphenodiscus lobatus (152080)
Late/Upper Maastrichtian72.2 - 66.0USA (Mississippi) Sphenodiscus lenticularis (4127 4164) Sphenodiscus lobatus (205793)
Late/Upper Maastrichtian72.2 - 66.0USA (South Dakota) Sphenodiscus lenticularis (88511)
Late/Upper Maastrichtian72.2 - 66.0USA (Missouri) Sphenodiscus lobatus (205794)
Late/Upper Maastrichtian72.2 - 66.0USA (New Jersey) Sphenodiscus lobatus (4377)
Maastrichtian72.2 - 66.0Mexico (Coahuila) Sphenodiscus lenticularis (51546)
Maastrichtian72.2 - 66.0USA (Texas) Sphenodiscus lenticularis (4535 4553 4627)
Maastrichtian72.2 - 66.0USA (Mississippi) Sphenodiscus lobatus (7606)
Maastrichtian72.2 - 66.0Jordan Sphenodiscus lobatus (166341 166342 166343)
Late/Upper Maastrichtian - Early/Lower Paleocene72.2 - 61.66USA (New Jersey) Sphenodiscus lobatus (26819)