PBDB Taxon

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

Placenticeratidae

Cephalopoda - Ammonitida - Placenticeratidae

Taxonomy

Placenticeratidae was named by Hyatt (1900) [m. kosnik taxon no: 5228].

It was assigned to Ammonoidea by Howarth (1985); to Hoplitaceaea by Kennedy et al. (1992); to Hoplitaceae by Wright (1952), Förster (1975), Wiedmann (1978), Summesberger (1979), Kennedy (1984), Matsumoto (1984), Klinger and Kennedy (1989), Kennedy and Cobban (1991), Cobban and Kennedy (1992), Kennedy and Cobban (1993), Kennedy (1995), Kennedy et al. (1997), Kennedy and Summesberger (1999) and Szives (2007); and to Hoplitoidea by Kennedy et al. (2008), Mosavinia et al. (2014), Shigeta (2016), Kennedy and Gale (2016) and Kennedy (2018).

Subtaxa

Baghiceratinae, Gissarites, Hengestites, Hoplitoplacenticeras, Karamaites, Metaplacenticeras, Placenticeras (syn. Diplacomoceras, Pseudoplacenticeras, Karamaiceras), Proplacenticeras, Rapidoplacenticeratinae, Stantonoceras

Synonyms

Hypengonoceratidae was named by Chiplonkar and Ghare (1976).

It was synonymized subjectively with Placenticeratidae by Kennedy and Cobban (1991).
Baghiceratinae was named by Chiplonkar and Ghare (1976).

It was considered an invalid subgroup of Placenticeratidae by Kennedy and Cobban (1991).

Synonymy list

Year	Name and author
1900	Placenticeratidae Hyatt p. 585
1952	Placenticeratidae Wright
1975	Placenticeratidae Förster p. 216
1976	Baghiceratinae Chiplonkar and Ghare
1976	Hypengonoceratidae Chiplonkar and Ghare
1978	Placenticeratidae Wiedmann p. 666
1979	Placenticeratidae Summesberger p. 145
1984	Placenticeratidae Kennedy p. 38
1984	Placenticeratidae Matsumoto p. 20
1985	Placenticeratidae Howarth p. 84
1989	Placenticeratidae Klinger and Kennedy p. 266
1991	Placenticeratidae Kennedy and Cobban p. 175
1992	Placenticeratidae Cobban and Kennedy p. 73
1992	Placenticeratidae Kennedy et al. p. 270
1993	Placenticeratidae Kennedy and Cobban p. 834
1995	Placenticeratidae Kennedy p. 410
1997	Placenticeratidae Kennedy et al. p. 4
1999	Placenticeratidae Kennedy and Summesberger p. 25
2007	Placenticeratidae Szives p. 124
2008	Placenticeratidae Kennedy et al. p. 125
2014	Placenticeratidae Mosavinia et al. p. 82
2016	Placenticeratidae Kennedy and Gale p. 269
2016	Placenticeratidae Shigeta p. 343
2018	Placenticeratidae Kennedy p. 678

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Protostomia
—	Spiralia
superphylum	Lophotrochozoa
phylum	Mollusca

Rank	Name	Author
class	Cephalopoda	Cuvier 1797
subclass	Ammonoidea	()
order	Ammonitida
suborder	Ammonitina	Hyatt 1889
superfamily	Hoplitoidea	(Douvillé 1890)
family	Placenticeratidae
family	Placenticeratidae

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.

Fm. †Placenticeratidae Hyatt 1900

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G. †Gissarites Iljin 1958

†Gissarites iljini Khakimov 1976

†Gissarites kysylchense Iljin 1958

G. †Hengestites

G. †Hoplitoplacenticeras Paulcke 1906

Subg. †Hoplitoplacenticeras (Hoplitoplacenticeras) Paulcke 1907

†Hoplites plasticus semicostatus Paulcke 1907

†Hoplitoplacenticeras (Hoplitoplacenticeras) coesfeldiense Schluter 1867

†Hoplitoplacenticeras (Hoplitoplacenticeras) howarthi Collignon 1970

Invalid names: Hoplitoplacenticeras antokazoense Collignon 1970 [synonym], Hoplitoplacenticeras besairei Collignon 1970 [synonym], Hoplitoplacenticeras trangahyense Collignon 1970 [synonym]

†Hoplitoplacenticeras (Hoplitoplacenticeras) marroti Coquand 1859

†Hoplitoplacenticeras (Hoplitoplacenticeras) plasticum Paulcke 1907

†Hoplites plasticus costatus Paulcke 1907

†Hoplites plasticus hauthali Paulcke 1907

†Hoplites plasticus laevis Paulcke 1907

†Hoplitoplacenticeras (Hoplitoplacenticeras) preyi Kennedy and Summesberger 1999

Subg. †Hoplitoplacenticeras (Lemfoerdiceras) Kennedy 1986

†Hoplitoplacenticeras (Lemfoerdiceras) lafresnayanus d'Orbigny 1841

†Hoplitoplacenticeras (Lemfoerdiceras) lemfoerdensis Schluter 1872

†Hoplitoplacenticeras costulosum Schlüter 1867

†Hoplitoplacenticeras dolbergense Schluter 1876

†Hoplitoplacenticeras fugen Matsumoto 1984

†Hoplitoplacenticeras monju Matsumoto 1982

†Hoplitoplacenticeras plasticum Paulcke 1906

†Hoplitoplacenticeras rarecostatum Khakimov 1976

†Hoplitoplacenticeras rejaudryi de Grossouvre 1894

Invalid names: Sonneratia rara de Grossouvre 1894 [synonym]

†Hoplitoplacenticeras vari Schlüter 1872

G. †Karamaites Sokolov 1965

†Karamaites grossouvrei Semenov 1899

G. †Metaplacenticeras Spath 1926

†Metaplacenticeras bowersi Anderson 1958

†Metaplacenticeras californicum Anderson 1902

†Metaplacenticeras pacificum Smith 1900

†Metaplacenticeras sanctaemonicae Waring 1917

†Metaplacenticeras subtilistriatum Jimbo 1894

G. †Placenticeras Meek 1876

†Placenticeras bidorsatum Roemer 1841

Invalid names: Ammonites dujardin Schluter 1867 [synonym], Diplacomoceras canaliculatum Hyatt 1903 [synonym]

†Placenticeras cumminsi Cragin 1893

†Placenticeras fritschi de Grossouvre 1894

†Placenticeras intercalare Meek and Hayden 1860

†Placenticeras kaffrarium Etheridge 1904

Invalid names: Placenticeras umkwelanensis Etheridge 1904 [synonym]

†Placenticeras kolbajense Sokolov 1967

†Placenticeras maherndli Summesberger 1979

†Placenticeras mediasiaticum Luppov 1963

Invalid names: Turkmenites gissarensis Ilyin 1975 [synonym]

†Placenticeras memoriaschloenbachi Laube and Bruder 1887

†Placenticeras orbignyanum Geinitz 1849

†Placenticeras paraplanum Wiedmann 1978

†Placenticeras placenta DeKay 1828

†Placenticeras polyopsis Dujardin 1837

†Placenticeras pseudoplacenta Hyatt 1903

†Placenticeras semiornatum d'Orbigny 1850

†Placenticeras syrtale Morton 1834

Invalid names: Ammonites guadalupae Roemer 1849 [synonym], Placenticeras intermedium Johnson 1903 [synonym], Placenticeras newberryi Hyatt 1903 [synonym], Placenticeras planum Hyatt 1903 [synonym], Placenticeras rotundatum Johnson 1903 [synonym], Placenticeras sancarlosense Hyatt 1903 [synonym], Stantonoceras pseudocostatum Johnson et al. 1964 [synonym]

†Placenticeras tamulicum Blanford 1862

†Placenticeras vancouverense Meek 1861

†Placenticeras vredenburgi Sarkar 1966

†Placenticeras whitfieldi Hyatt 1903

Invalid names: Diplacomoceras Hyatt 1900 [synonym], Karamaiceras [synonym], Pseudoplacenticeras [synonym]

G. †Proplacenticeras

†Proplacenticeras stantoni Hyatt 1903

Invalid names: Placenticeras merenskyi Haughton 1930 [synonym]

G. †Stantonoceras

†Stantonoceras depressum Hyatt 1903

Invalid names: Baghiceratinae Chiplonkar and Ghare 1976 [invalid subgroup], Hypengonoceratidae Chiplonkar and Ghare 1976 [synonym], Rapidoplacenticeratinae Alabushev and Alabusheva 1988 [empty]

Diagnosis

No diagnoses are available

Measurements

No measurements are available

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 Cenomanian to the top of the Late/Upper Maastrichtian or 100.50000 to 66.00000 Ma

Collections (321 total)

Time interval	Ma	Country or state	Original ID and collection number
Oldest occurrences
Late/Upper Albian	105.3 - 99.6	Kazakhstan	Placenticeras kolbajense (175008)
Late/Upper Albian	105.3 - 99.6	Madagascar (Antsiranana)	Proplacenticeras rerati (86507)
Late/Upper Albian	105.3 - 99.6	Iran	Hengestites sp., Placenticeras grossouvrei (174586)
Cenomanian	100.5 - 93.9	USA (Utah)	Placenticeras cumminsi (5608)
Cenomanian	100.5 - 93.9	USA (Arizona)	Placenticeras sp. (3080 3085 3088 3090 3094 3095 3096)
Cenomanian - Turonian	100.5 - 89.8	USA (Texas)	Placenticeras cumminsi (234310)
Late/Upper Cretaceous	100.5 - 66.0	USA (California)	Metaplacenticeras sanctaemonicae (206274 206278 237458 237459 237460) Placenticeras californicum, Placenticeras pacificum, Placenticeras sanctaemonicae (193034)
Early/Lower Cenomanian - Late/Upper Albian	99.6 - 99.6	Spain	Proplacenticeras sp. (3832)
Early/Lower Cenomanian	99.6 - 93.5	Kazakhstan	Placenticeras mediasiaticum (175009)
Late/Upper Cenomanian	99.6 - 93.5	Angola	Proplacenticeras stantoni (70955)
Youngest occurrences
Time interval	Ma	Country or state	PBDB collection number
Middle Campanian	83.5 - 70.6	USA (California)	Metaplacenticeras californicum (221105 221106 221107)
Middle Campanian	83.5 - 70.6	USA (Mississippi)	Placenticeras sp. (3867)
Middle Campanian	83.5 - 70.6	USA (South Dakota)	Placenticeras sp. (235333)
Middle Campanian	83.5 - 70.6	Japan	Metaplacenticeras subtilistriatum (181920 181921 181922)
Middle Campanian - Late/Upper Campanian	83.5 - 70.6	USA (New Jersey)	Placenticeras placenta (3870)
Middle Campanian - Late/Upper Campanian	83.5 - 70.6	USA (California)	Metaplacenticeras pacificum (215264)
Late/Upper Campanian - Early/Lower Maastrichtian	83.5 - 66.0	USA (New Jersey)	Placenticeras minor (221052) Placenticeras syrtale (57916)
Maastrichtian	72.1 - 66.0	USA (Texas)	Placenticeras interealare (7549) Placenticeras meeki (7483 7531 7536 7548 7569)
Late/Upper Maastrichtian	70.6 - 66.0	USA (North Carolina)	Placenticeras sp. (7616)
Late/Upper Maastrichtian	70.6 - 66.0	France	Hoplitoplacenticeras lasfresnayanum (83648)