PBDB Taxon

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Placenticeras

Cephalopoda - Ammonitida - Placenticeratidae

Taxonomy

Placenticeras was named by Meek (1876) [Sepkoski's age data: K Ceno-l K Maes]. Its type is Ammonites placenta.

It was assigned to Ammonoidea by Sepkoski (2002); and to Placenticeratidae by Wiedmann (1978), Summesberger (1979), Cobban and Hook (1983), Kennedy (1984), Klinger and Kennedy (1989), Kennedy and Cobban (1991), Matsumoto and Skwarko (1991), Cobban and Kennedy (1992), Kennedy and Cobban (1993), Kennedy and Cobban (1994), Kennedy (1995), Kennedy and Kaplan (1995), Kennedy et al. (1997), Kennedy et al. (2001), Szives (2007), Kennedy et al. (2008), Mosavinia et al. (2014), Kennedy and Gale (2016) and Kennedy (2018).

Species

P. bidorsatum (syn. Ammonites dujardin, Diplacomoceras canaliculatum), P. cumminsi, P. fritschi, P. kaffrarium, P. kolbajense, P. maherndli, P. mediasiaticum (syn. Turkmenites gissarensis), P. memoriaschloenbachi, P. orbignyanum, P. paraplanum, P. placenta, P. polyopsis, P. pseudoplacenta, P. semiornatum, P. syrtale (syn. Stantonoceras pseudocostatum), P. tamulicum, P. vancouverense, P. vredenburgi, P. whitfieldi

Species lacking formal opinion data

P. intercalare, P. meeki

Synonyms

Karamaiceras is a genus. It is not extant.

It was synonymized subjectively with Placenticeras by Wright et al. (1996).

It was assigned to Ammonoidea by Sepkoski (2002).
Pseudoplacenticeras is a genus. It is not extant.

It was synonymized subjectively with Placenticeras by Wright et al. (1996).

It was assigned to Ammonoidea by Sepkoski (2002).
Diplacomoceras was named by Hyatt (1900) [Sepkoski's age data: K Camp-l]. It is not extant.

It was synonymized subjectively with Placenticeras by Kennedy (1984).

It was assigned to Ammonoidea by Sepkoski (2002).

Synonymy list

Year	Name and author
1876	Placenticeras Meek
1900	Diplacomoceras Hyatt p. 585
1978	Placenticeras Wiedmann p. 666
1979	Placenticeras Summesberger p. 152
1983	Placenticeras Cobban and Hook p. 8
1984	Placenticeras Kennedy p. 38
1989	Placenticeras Klinger and Kennedy p. 266
1991	Placenticeras Kennedy and Cobban p. 175
1991	Placenticeras Matsumoto and Skwarko p. 249
1992	Placenticeras Cobban and Kennedy p. 73
1993	Placenticeras Kennedy and Cobban p. 834
1994	Placenticeras Kennedy and Cobban p. 1288
1995	Placenticeras Kennedy p. 410
1995	Placenticeras Kennedy and Kaplan p. 28
1997	Placenticeras Kennedy et al. p. 4
2001	Placenticeras Kennedy et al. p. 4
2002	Diplacomoceras Sepkoski
2002	Karamaiceras Sepkoski
2002	Placenticeras Sepkoski
2002	Pseudoplacenticeras Sepkoski
2007	Placenticeras Szives p. 124
2008	Placenticeras Kennedy et al. p. 125
2014	Placenticeras Mosavinia et al. p. 82
2016	Placenticeras Kennedy and Gale p. 269
2018	Placenticeras 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
genus	Placenticeras	Meek 1876

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.

G. †Placenticeras Meek 1876

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†Placenticeras bidorsatum Roemer 1841

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

†Placenticeras cumminsi Cragin 1893

†Placenticeras fritschi de Grossouvre 1894

†Placenticeras kaffrarium Etheridge 1904

†Placenticeras kolbajense Sokolov 1967

†Placenticeras maherndli Summesberger 1979

†Placenticeras mediasiaticum Luppov 1963

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