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Geczyceras

Cephalopoda - Ammonitida - Hammatoceratidae

Taxonomy
Geczyceras was named by Martínez (1992). It is not extant. Its type is Hammatoceras speciosum.

It was synonymized subjectively with Hammatoceras by Howarth (2013).

It was assigned to Hammatoceratinae by Kovács (2009); and to Hammatoceratidae by Benzaggagh (2024).

Synonymy list
YearName and author
1992Geczyceras Martínez
2009Geczyceras Kovács
2024Geczyceras Benzaggagh

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
phylumMollusca
RankNameAuthor
classCephalopodaCuvier 1797
subclassAmmonoidea()
orderAmmonitidaHaeckel 1866
suborderAmmonitinaHyatt 1889
superfamilyHammatoceratoideaSchindewolf 1964
familyHammatoceratidaeBuckman 1887
genusGeczycerasMartínez 1992

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. †Geczyceras Martínez 1992
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†Geczyceras allobrogense Dumortier 1874
†Geczyceras bonarellii Parisch and Viale 1906
†Geczyceras clausum Gabilly 1973
†Geczyceras costatum Gabilly 1973
†Geczyceras costulosum Merla 1934
†Geczyceras galaczi Kovács 2009
†Geczyceras martinezae Kovács 2009
†Geczyceras perplanum Prinz 1904
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Invalid names: Hammatoceras clavatum Fossa-Mancini 1914 [synonym]
†Geczyceras porcarellense Bonarelli 1899
†Geczyceras speciosum Janensch 1902
Diagnosis
No diagnoses are available
Measurements
partNmeanminimummaximummedians.d.
height1033.620.050.033.58.93
diameter1098.659.0154.0100.031.5
inflation1039.816.766.043.015.8
shell height1129.316.050.026.012.0
shell diameter11118.880.0210.0118.045.9
shell inflation1167.943.0118.060.027.8

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: Late/Upper Toarcian or 180.40000 to 174.70000 Ma

Collections (79 total)


Time interval Ma Country or state Original ID and collection number
Toarcian184.2 - 174.7France Hammatoceras speciosum (210881)
Levesquei182.9 - 174.7Hungary G. perplanum (146434)
Levesquei182.9 - 174.7France (Deux-Sevrès) Hammatoceras speciosum (140875 147172)
Levesquei182.9 - 174.7Bulgaria Hammatoceras speciosum (151018)
Levesquei182.9 - 174.7Spain Hammatoceras porcarellense (147102) Hammatoceras speciosum (147091 147093 147095 147100)
Middle Toarcian - Late/Upper Toarcian182.9 - 174.7Morocco (Taza-Al Hoceima-Taounate) G. costulosum (234054)
Variabilis182.9 - 174.7Hungary G. bonarellii (107912 108055) G. costatum (108078 108470) G. perplanum (108476) G. speciosum, G. porcarellense, G. clausum (108077)
Variabilis182.9 - 174.7Spain G. bonarelli (131824) G. costatum (126513 126514 126516 126518) Hammatoceras costatum (146974)
Late/Upper Toarcian180.4 - 174.7Spain G. speciosum (126526)
Late/Upper Toarcian180.4 - 174.7Spain (Murcia) G. allobrogense (201639)
Late/Upper Toarcian180.4 - 174.7Hungary G. allobrogense (108688) G. bonarellii (108574 108628) G. galaczi, G. speciosum (108575) G. perplanum (108631 108635 108638) G. perplanum, G. bonarellii (108594) G. porcarellense (108636) G. porcarellense, G. bonarellii (108629) G. speciosum (108576 108577 108596 108597 108598 108632 108633 108634) G. speciosum, G. bonarellii (108593) G. speciosum, G. perplanum (108595 108630)
Late/Upper Toarcian180.4 - 174.7Spain (Granada) G. allobrogense (201316 201318 201333 201339 201349) G. costulatosus, G. perplanum (201304) G. costulatosus, G. porcarelense, G. victorii, G. perplanum (201306) G. menghinii (201359) G. menghinii, G. allobrogense (201322) G. perplanum (201292) G. porcarelense (201334) G. sp (201300) G. sp, G. speciosum, G. perplanum (201302) G. tipperi (201366)
Late/Upper Toarcian180.4 - 174.7France G. spp., Hammatoceras speciosum (161670) G. spp., Hammatoceras speciosum, Hammatoceras bonarellii (161668)
Late/Upper Toarcian180.4 - 174.7Canada (British Columbia) Hammatoceras speciosum (53435 53436 59556 59568)
Thouarsense180.4 - 174.7Spain Hammatoceras costatum (146977)
Thouarsense180.4 - 174.7Hungary G. bonarellii (108477 108572 108589 108590 108682 108683) G. martinezae (108591) G. porcarellense (107913 108074 108075 108627) G. porcarellense, G. bonarellii (108626)