| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Placenticeras
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).
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
Synonyms
|
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 |
Is something missing? Join the Paleobiology Database and enter the data
|
|
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
show all | hide all
†Placenticeras bidorsatum Roemer 1841
hide
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
hide
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
hide
Invalid names: 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]
Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 32 | 38.7 | 19.4 | 124.9 | 38.0 | 19.9 | |
| shell diameter | 32 | 76.6 | 38.4 | 262.0 | 74.2 | 42.9 | |
| shell inflation | 32 | 12.6 | 5.00 | 52.9 | 12.7 | 9.33 |
|
|
||||
|
|
||||
|
|
||||
|
|
||||
| Source: o = order, c = class | |||||
| References: Kiessling 2003, Kiessling 2004 | |||||
Age range: base of the Cenomanian to the top of the Early/Lower Maastrichtian or 100.50000 to 66.00000 Ma
Collections (213 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Albian | Kazakhstan | P. kolbajense (175008) | |
| Cenomanian | USA (Arizona) | P. sp. (3080 3085 3088 3090 3094 3095 3096) | |
| Cenomanian | USA (Utah) | P. cumminsi (5608) | |
| Early/Lower Cenomanian | Kazakhstan | P. mediasiaticum (175009) | |
| Late/Upper Cenomanian | USA (Utah) | P. sp. (3328 3329 3330 3692) | |
| Late/Upper Cenomanian | USA (Arizona) | P. cumminsi (54164 55813) | |
| Late/Upper Cenomanian | Germany (Sachsen) | P. memoriaschloenbachi (172049 172053) | |
| Late/Upper Cenomanian | USA (New Mexico) | P. sp., P. cumminsi (230855) | |
| Middle Cenomanian | Iran | P. guardakense (174335) | |
| Turonian | France | P. sp. (174894) | |
| Turonian | USA (Minnesota) | Proplacenticeras pseudoplacenta (88021) | |
| Turonian - Coniacian | Canada (British Columbia) | P. pseudoplacenta (87587) | |
| Turonian - Coniacian | Argentina | P. sp. (66638) | |
| Turonian - Coniacian | USA (Wyoming) | P. pseudoplacenta (87757) | |
| Early/Lower Turonian | Germany (Sachsen) | P. memoriaschloenbachi (172068) | |
| Early/Lower Turonian | USA (Arizona) | P. sp. (3208 3218 3226 3229 3232 3285) | |
| Early/Lower Turonian | USA (New Mexico) | P. cumminsi (87805 87809) | |
| Late/Upper Turonian | USA (South Dakota) | Proplacenticeras pseudoplacenta (88005) | |
| Middle Turonian | Angola | P. kaffrarium (210897) | |
| Middle Turonian | Papua New Guinea | P. tamulicum (177069) | |
| Middle Turonian | USA (New Mexico) | P. cumminsi (88811 88812) P. pseudoplacenta (171837 171840 171842) Proplacenticeras pseudoplacenta (178759) | |
| Middle Turonian | USA (Arizona) | P. cumminsi (53504 54153) | |
| Late/Upper Turonian - Coniacian | Uzbekistan (Navoi) | P. kyzylkumense (123485) | |
| Middle Turonian - Santonian | Papua New Guinea | P. tamulicum (177073) | |
| Coniacian | Mexico (Chihuahua) | Proplacenticeras fritschi (88227) | |
| Coniacian | France | P. fritschi (178942 178951) Proplacenticeras fritschi (3735) | |
| Coniacian | India (Tamil Nadu) | P. tamilicum (46393) P. tamulicum (46442) | |
| Coniacian | South Africa | P. kaffrarium (82449 82450) | |
| Coniacian | USA (Texas) | P. sp. (88539) | |
| Early/Lower Coniacian | Angola | P. kaffrarium (210898 210899) | |
| Early/Lower Coniacian | Germany (Sachsen) | Ammonites orbignyanus (172052) | |
| Early/Lower Coniacian | India (Tamil Nadu) | P. kaffrarium (198603) | |
| Early/Lower Coniacian | South Africa | P. kaffrarium (70999 82454 82456 82457) Proplacenticeras kaffrarium (82505) | |
| Late/Upper Coniacian | France | P. semiornatum (178952) | |
| Middle Coniacian | USA (Wyoming) | P. pseudoplacenta (88543) | |
| Middle Coniacian | France | P. fritschi (178947 178948 178949 178950) | |
| Middle Coniacian | South Africa | P. kaffrarium (82440 82443 82444 82445 82451 82452 82453 82455) | |
| Middle Coniacian | Canada (Alberta) | P. syrtale (87512) | |
| Middle Coniacian | Poland | Ammonites orbignyanus (172051) | |
| Santonian | USA (New Mexico) | P. sp. (87850) P. syrtale (234103) | |
| Santonian | France | Ammonites semiornatus (178953) P. syrtale (3737) | |
| Santonian | USA (Alabama) | P. benningi (5163) | |
| Santonian | USA (Georgia) | P. benningi (5159 5161 5189) | |
| Early/Lower Santonian | Poland | P. orbignyanum (179488) | |
| Early/Lower Santonian | USA (Colorado) | P. placentum, Stantonoceras pseudocostatum (87852 87854) | |
| Early/Lower Santonian | Spain (Catalunia) | P. polyopsis (162692) | |
| Early/Lower Santonian | Spain | P. polyopsis (74468) | |
| Early/Lower Santonian - Middle Santonian | USA (Georgia) | P. benningi (80889) | |
| Late/Upper Santonian | Austria | P. maherndli (177758 178863) P. paraplanum (178914) P. paraplanum, P. maherndli (178860) | |
| Late/Upper Santonian | USA (Mississippi) | P. syrtale (3584) | |
| Late/Upper Santonian | USA (Texas) | P. syrtale (83075) | |
| Late/Upper Santonian | France | P. maherndli (179664) P. paraplanum (178859 179639 179640 179662 179663) P. paraplanum, P. maherndli, P. polyopsis (179119) P. paraplanum, P. polyopsis (179659) P. polyopsis (179115 179223 179587 179660) | |
| Late/Upper Santonian | USA (Delaware) | P. syrtale (88607) | |
| Late/Upper Santonian | Canada (Alberta) | P. planum (89222) | |
| Late/Upper Santonian - Middle Campanian | USA (Georgia) | P. sp. (35289) | |
| Campanian | USA (New Mexico) | P. meeki (88565) | |
| Campanian | USA (New Jersey) | P. placenta (124222 141944) P. sp. (124929) | |
| Campanian | USA (Kansas) | P. meeki (71830 71831 71832) | |
| Campanian | Mexico (Coahuila de Zaragoza) | P. syrtale (88229 88230 88231 88232) P. whitfieldi (88236) | |
| Campanian | USA (North Carolina) | P. placenta (190555 190579) P. sp. (7610) | |
| Campanian | USA (Wyoming) | P. intercalare (1641 1724 233961) P. meeki (1637 1668 1677) P. sp. (1643 1654 1671 1678 1740) | |
| Early/Lower Campanian | Germany | P. bidorsatum (165367 165374 165375 165376 165377 165378) | |
| Early/Lower Campanian | France | P. bidorsatum (165845 165846 165847 165848 165849 165850) | |
| Early/Lower Campanian | USA (Alabama) | P. sp. (171351) | |
| Early/Lower Campanian | USA (New Jersey) | P. placenta (82387 88606 88610 188337) | |
| Early/Lower Campanian | USA (Texas) | P. placenta (221086) | |
| Early/Lower Campanian | USA (Maryland) | P. placenta (27571) P. placenta, P. syrtale (82386) | |
| Early/Lower Campanian | Germany (Westfalen) | Ammonites bidorsatus (165365) | |
| Early/Lower Campanian | Canada (Alberta) | P. intercalare (82647) P. meeki (82652) | |
| Early/Lower Campanian | USA (Delaware) | P. placenta (6119 6120 6123 6130 6133 6135 46566 88609) | |
| Early/Lower Campanian - Middle Campanian | USA (Mississippi) | P. placenta (6655 6656 6657 6658) P. sp. (6660 6661) | |
| Early/Lower Campanian - Middle Campanian | USA (New Jersey) | Ammonites placenta (48725) P. placenta (141940) | |
| Late/Upper Campanian | Canada (Alberta) | P. meeki (82640) P. meeki, P. intercalare (82638 82641) P. sp. (210457) | |
| Late/Upper Campanian | USA (Montana) | P. intercalare (213172) P. meeki (213000 213077 213173) | |
| Late/Upper Campanian | Canada (Saskatchewan) | P. meeki, P. intercalare (87441) | |
| Late/Upper Campanian | France | P. bidorsatum (165841) | |
| Late/Upper Campanian | USA (Wyoming) | P. intercalare, P. meeki (1639 1640) | |
| Late/Upper Campanian | USA (Colorado) | P. meeki, P. sp. (162249) | |
| Late/Upper Campanian | USA (Texas) | P. sp. (73635) | |
| Late/Upper Campanian | USA (Delaware) | P. sp., P. placenta (83133) | |
| Late/Upper Campanian | USA (New Mexico) | P. sp. (88564) | |
| Late/Upper Campanian | USA (Arkansas) | P. sp. (83054 83092 83094) | |
| Middle Campanian | USA (Mississippi) | P. sp. (3867) | |
| Middle Campanian | USA (Texas) | P. meeki, P. sp. (7467) P. meeki, P. sp., P. syrtale (7470) | |
| Middle Campanian - Late/Upper Campanian | USA (New Jersey) | P. placenta (3870) | |
| Late/Upper Campanian - Early/Lower Maastrichtian | USA (New Jersey) | P. minor (221052) P. syrtale (57916) | |
| Maastrichtian | USA (Texas) | P. interealare (7549) P. meeki (7483 7531 7536 7548 7569) | |
| Late/Upper Maastrichtian | USA (North Carolina) | P. sp. (7616) |