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Rhacheosaurini

Osteichthyes - Metriorhynchidae

Taxonomy
Rhacheosaurini was named by Young et al. (2011). It is not extant. Its type is Rhacheosaurus. It was considered monophyletic by Parrilla-Bel et al. (2013).

It was assigned to Metriorhynchinae by Parrilla-Bel et al. (2013), Barrientos-Lara et al. (2018), Young et al. (2024).

Synonymy list
YearName and author
2011Rhacheosaurini Young et al.
2013Rhacheosaurini Parrilla-Bel et al. pp. 3-4
2018Rhacheosaurini Barrientos-Lara et al.
2024Rhacheosaurini Young et al. p. 600

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
classOsteichthyes
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
—Sauropsida
classReptilia
subclassEureptilia()
RankNameAuthor
—Romeriida
—Diapsida()
—Archosauromorpha(Huene 1946)
—Crocopoda
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
—Pseudosuchia(Zittel 1890)
—SuchiaKrebs 1974
—Paracrocodylomorpha
—Loricata(Merrem 1820)
—Crocodylomorpha()
infraorderThalattosuchia()
—Neothalattosuchia
superfamilyMetriorhynchoideaYoung et al. 2010
—Euthalattosuchia
familyMetriorhynchidaeFitzinger 1843
subfamilyMetriorhynchinae
tribeRhacheosauriniYoung et al. 2011
tribeRhacheosauriniYoung et al. 2011

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.

Tr. †Rhacheosaurini Young et al. 2011
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G. †Cricosaurus Wagner 1858
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†Cricosaurus albersdoerferi Sachs et al. 2021
†Cricosaurus araucanensis Gasparini and Dellape 1976
†Cricosaurus bambergensis Sachs et al. 2019
†Cricosaurus elegans Wagner 1852
†Cricosaurus gracilis Phillips 1871
†Cricosaurus lithographicus Herrera et al. 2013
†Cricosaurus mexicanus Wieland 1910
†Cricosaurus puelchorum Herrera et al. 2021
†Cricosaurus rauhuti Herrera et al. 2021
†Cricosaurus saltillensis Buchy et al. 2006
†Cricosaurus schroderi Kuhn 1936
†Cricosaurus suevicus Fraas 1901
†Cricosaurus vignaudi Frey et al. 2002
Invalid names: Enaliosuchus Koken 1883 [synonym], Neustosaurus Raspail 1842 [nomen dubium]
G. †Rhacheosaurus Meyer 1831
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†Rhacheosaurus gracilis Meyer 1831
Diagnosis
ReferenceDiagnosis
J. Parrilla-Bel et al. 2013Metriorhynchid crocodylomorphs with the following unique combination of characters (autapomorphic characters are indicated by an asterisk): posterodorsal retraction of external nares, with the anterior margin of the external nares starting posterior to the first premaxillary alveolus (ch. 7:3)*; development of premaxillary septum that divides the external nares along the skull midline (ch. 9:1)*; supratemporal fenestra subequal or shorter in length than orbits*; frontopostorbital suture lower than (ventral to) the intertemporal bar (ch. 60:1)*; infratemporal fenestra shorter in length than the orbit (ch. 86:2); paroccipital process dorsolaterally orientated, at an approximate 45 degree angle (ch. 104:1)*; teeth lack carinae (ch. 167:0); the anterior margin of both angular and surangular bones terminates anterior to the orbit (ch. 139–140:1)*; presacral vertebrae count increased by one (to 25) (ch. 178:1)*; number of caudal vertebrae increased by at least eight (>45); humerus shaft greatly reduced, contributing less than 25% of total humeral length (ch. 207:2); radius and ulna are subequal in size to the radiale and ulnare, respectively; tibia length greatly shortened, measuring less than 30% of femoral length (ch. 225:3).
Measurements
No measurements are available
Composition: hydroxyapatitesubo
Environment: marinesubo
Locomotion: actively mobilesubo
Life habit: nektonicsubo
Diet: carnivoresubo
Created: 2009-07-23 01:12:29
Modified: 2009-07-23 03:12:29
Source: subo = suborder
Reference: Kiessling 2004

Age range: base of the Middle Oxfordian to the top of the Late/Upper Valanginian or 161.50000 to 132.60000 Ma

Collections (22 total)


Time interval Ma Country or state Original ID and collection number
Middle Oxfordian - Late/Upper Oxfordian161.5 - 154.8Cuba (Pinar del Río) Cricosaurus sp. Cuba (45797)
Kimmeridgian154.8 - 149.2Germany (Bavaria) Cricosaurus bambergensis (207479)
Late/Upper Kimmeridgian152.21 - 149.2Germany (Bayern) Cricosaurus sp., Cricosaurus albersdoerferi (130048)
Late/Upper Kimmeridgian152.21 - 149.2Germany (Baden-Württemberg) Cricosaurus suevicus (154138) Geosaurus suevicus (41817 229120)
Late/Upper Kimmeridgian152.21 - 149.2Mexico (Coahuila) Cricosaurus saltillensis (110176)
Early/Lower Tithonian149.2 - 145.06Argentina Cricosaurus araucanensis (144919)
Early/Lower Tithonian149.2 - 145.06Germany (Bavaria) Cricosaurus rauhuti (224058) Rhacheosaurus gracilis (58604)
Early/Lower Tithonian149.2 - 145.06Germany (Bayern) Cricosaurus elegans, Cricosaurus gracilis (132062) Cricosaurus elegans, Rhacehosaurus gracilis (53039) Rhacheosaurus gracilis (212951)
Early/Lower Tithonian149.2 - 145.06Mexico (Coahuila) Geosaurus saltillense (104859)
Early/Lower Tithonian149.2 - 145.06Argentina (Neuquén) Cricosaurus sp., Cricosaurus araucanensis (79651)
Middle Tithonian - Late/Upper Tithonian149.2 - 143.1Argentina (Neuquén) Cricosaurus lithographicus (92122)
Tithonian149.2 - 143.1Germany (Franconia) Cricosaurus elegans (24521)
Tithonian149.2 - 143.1Mexico (Puebla) Geosaurus vignaudi (27249)
Early/Lower Berriasian143.1 - 141.0Argentina (Mendoza) Cricosaurus puelchorum (224057)
Early/Lower Valanginian137.05 - 132.6France (Provence-Alpes-Côte d'Azur) Enaliosuchus macrospondylus (68272) Neustosaurus gigondarum (123475)
Late/Upper Valanginian137.05 - 132.6Germany (Lower Saxony) Cricosaurus macrospondylus (155308)