Caiman - Wikipedia

Subfamily of reptiles Not to be confused with caiman lizards (a kind of lizard) or blue iguanas, which are sometimes called Grand Cayman iguanas. For the genus, see Caiman (genus). For other uses, see Caiman (disambiguation).

CaimansTemporal range: Paleocene–Present PreꞒ Ꞓ O S D C P T J K Pg N Possible Maastrichtian origin if Late Cretaceous taxa are included[1]
Yacare caiman, Caiman yacare
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Archosauria
Order:	Crocodilia
Family:	Alligatoridae
Subfamily:	CaimaninaeBrochu, 1999
Type genus
CaimanSpix, 1825
Subgroups
†Bottosaurus †Chinatichampsus †Culebrasuchus †Eocaiman †Globidentosuchus †Gnatusuchus †Kuttanacaiman †Mourasuchus †Necrosuchus †Orthogenysuchus Paleosuchus †Paranacaiman †Paranasuchus †Protocaiman †Tsoabichi †Brachychampsini Cossette & Tarailo, 2024[2] †Albertochampsa †Brachychampsa †Chrysochampsa †Stangerochampsa Jacarea Norell, 1988 Caiman Melanosuchus †Acresuchus †Centenariosuchus †Necrosuchus †Purussaurus

A caiman (/ˈkeɪmən/ (also spelled cayman[3]) from Taíno kaiman[4][additional citation(s) needed]) is an alligatorid belonging to the subfamily Caimaninae, one of two primary lineages within the Alligatoridae family, the other being alligators. Caimans are native to Central and South America and inhabit marshes, swamps, lakes, and mangrove rivers. They have scaly skin and live a fairly nocturnal existence. They are relatively small-sized crocodilians with an average maximum weight of 6 to 40 kg (13 to 88 lb) depending on species, with the exception of the black caiman (Melanosuchus niger), which can grow more than 4 m (13 ft) long and weigh more than 450 kg (990 lb). The black caiman is the largest caiman species in the world and is found in the slow-moving rivers and lakes that surround the Amazon basin. The smallest species is the Cuvier's dwarf caiman (Paleosuchus palpebrosus), which grows to 1.2 to 1.5 m (3.9 to 4.9 ft) long. There are six different species of caiman found throughout the watery jungle habitats of Central and Southern America. The average length for most of the other caiman species is about 2 to 2.5 m (6.6 to 8.2 ft) long.

Caimans are distinguished from alligators, their closest relatives, by a few defining features: a lack of a bony septum between the nostrils, ventral armor composed of overlapping bony scutes formed from two parts united by a suture, and longer and sharper teeth than alligators. Caimans also tend to be more agile and crocodile-like in their movements.[5] The calcium rivets on caiman scales make their hides stiffer than those of alligators.

Several extinct forms are known, including Purussaurus, a giant Miocene genus that grew to 7.6–10 m (25–33 ft)[6] and the 5.89 m (19.3 ft) Mourasuchus, which had a wide duck-like snout.[6]

Behavior

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Caimans are predators and, like alligators and crocodiles, their diet largely consists of fish. Caimans also hunt insects, birds, small mammals and reptiles.

Because of their large size and ferocious nature, caimans have few natural predators within their environments. Humans are their main predators, because the animals have been hunted for their meat and skin. Jaguars, anacondas and crocodiles are the only other predators of caimans, although they usually prey on the smaller specimens or specific species of caiman such as the Spectacled Caiman and Yacare caiman. During summer or droughts, caimans may dig a burrow and go into a form of summer hibernation called aestivation.

Female caimans build a large nest in which to lay their eggs. The nests can be more than 1.5 m (4.9 ft) wide. Female caimans lay between 10 and 50 eggs, which hatch within about six weeks. Once they have hatched, the mother caiman takes her young to a shallow pool of water, where they can learn how to hunt and swim. The juveniles of spectacled caiman have been shown to stay together in pods for up to 18 months.[7]

Phylogeny

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Caimaninae is cladistically defined as Caiman crocodylus (the spectacled caiman) and all species closer to it than to Alligator mississippiensis (the American alligator).[8][9] This is a stem-based definition for caimaninae, and means that it includes more basal extinct caimanine ancestors that are more closely related to living caimans than to alligators. The clade Jacarea includes the most derived caimans, being defined as the last common ancestor of Caiman latirostris (Broad-snouted caiman), Caiman crocodilus (Spectacled caiman), Caiman yacare (Yacare caiman), Melanosuchus niger (Black caiman), and all its descendants.[1]

Below is a cladogram showing the phylogeny of Caimaninae, modified from Hastings et al. (2013).[10]

†Stangerochampsa mccabei †Brachychampsa montana †Brachychampsa sealeyi Alligatoridae Alligatorinae Caimaninae †Culebrasuchus mesoamericanus †Eocaiman cavernensis †Tsoabichi greenriverensis crown group caimans Paleosuchus palpebrosus Cuvier's dwarf caiman Paleosuchus trigonatus Smooth-fronted caiman †Centenariosuchus gilmorei †Purussaurus neivensis †Mourasuchus spp. †Orthogenysuchus olseni Caiman crocodilus Spectacled caiman Caiman yacare Yacare caiman Caiman latirostris Broad-snouted caiman †Caiman lutescens †Melanosuchus fisheri Melanosuchus niger Black caiman

Here is an alternative cladogram from Bona et al. 2018.[11]

Alligatoridae

Alligatorinae (stem-based group) Caimaninae Stangerochampsa† Albertochampsa† Brachychampsa† Protocaiman† Gnatusuchus† Globidentosuchus† Eocaiman† Notocaiman† Kuttanacaiman† Purussaurus† Mourasuchus† crown group caimans Necrosuchus† Tsoabichi† Paleosuchus trigonatus Smooth-fronted caiman Paleosuchus palpebrosus Cuvier's dwarf caiman Centenariosuchus† Caiman latirostris Broad-snouted caiman Melanosuchus niger Black caiman Caiman yacare Yacare caiman Caiman crocodilus Spectacled caiman Caiman brevirostris† La Venta Caiman† Caiman wannlangstoni† (stem-based group)

(crown group)

The Late Cretaceous taxa Stangerochampsa, Brachychampsa and Albertochampsa have been previously referred to as stem-group caimans,[11][1] but Walter et al. (2022) recovered them as the basalmost alligatorines based on phylogenetic analysis and claimed that the earliest definitive stem-group caimans are known from the earliest Paleocene.[12] A different study by Adam Cossette and David Tarailo in 2024 recovered Brachychampsa and relatives in a clade at the base of Caimaninae. They named this clade Brachychampsini, defining it as "the largest clade of alligatorids more closely related to Brachychampsa montana than to Caiman crocodilus or Alligator mississippiensis".[2]

See also

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• Chinese alligator

References

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1. ^ a b c Rio, Jonathan P.; Mannion, Philip D. (6 September 2021). "Phylogenetic analysis of a new morphological dataset elucidates the evolutionary history of Crocodylia and resolves the long-standing gharial problem". PeerJ. 9 e12094. doi:10.7717/peerj.12094. PMC 8428266. PMID 34567843.
2. ^ a b Cossette, A. P.; Tarailo, D. A. (2024). "Crocodylian diversity during the early Eocene climatic optimum in the Golden Valley Formation of North Dakota, U.S.A." Journal of Vertebrate Paleontology. 44 e2403579. doi:10.1080/02724634.2024.2403579.
3. ^ Dictionary.com, retrieved February 16, 2021
4. ^ Patte, Marie-France (2010). "Arawak vs. Lokono. What's in a name?". In Faraclas, Nicholas (ed.). In a Sea of Heteroglossia: Pluri-Lingualism, Pluri-Culturalism, and Pluri-Identification in the Caribbean. Curaçao: Fundashon pa Planifikashon di Idioma & Universiteit van de Nederlandse Antillen. p. 80. ISBN 978-99904-2-300-6.
5. ^ Guggisberg, C.A.W. (1972). Crocodiles: Their Natural History, Folklore, and Conservation. David & Charles. p. 195. ISBN 978-0-7153-5272-4.
6. ^ a b Paiva, Ana Laura S.; Godoy, Pedro L.; Souza, Ray B.B.; Klein, Wilfried; Hsiou, Annie S. (2022). "Body size estimation of Caimaninae specimens from the Miocene of South America". Journal of South American Earth Sciences. 118 103970. doi:10.1016/j.jsames.2022.103970. ISSN 0895-9811.
7. ^ Gorzula, S. J. (1978). "An Ecological Study of Caiman crocodilus crocodilus Inhabiting Savanna Lagoons in the Venezuelan Guayana". Oecologia. 35 (1): 21–34. doi:10.1007/BF00345539. ISSN 0029-8549. JSTOR 4215651. PMID 28309866.
8. ^ Brochu, C. A. (2003). "Phylogenetic approaches toward crocodylian history" (PDF). Annual Review of Earth and Planetary Sciences. 31 (31): 357–97. Bibcode:2003AREPS..31..357B. doi:10.1146/annurev.earth.31.100901.141308. Archived from the original on 2015-04-02. Retrieved 2021-07-26.
9. ^ Brochu, C. A. (2011). "Phylogenetic relationships of Necrosuchus ionensis Simpson, 1937 and the early history of caimanines". Zoological Journal of the Linnean Society. 163: S228 – S256. doi:10.1111/j.1096-3642.2011.00716.x.
10. ^ Hastings, A. K.; Bloch, J. I.; Jaramillo, C. A.; Rincon, A. F.; MacFadden, B. J. (2013). "Systematics and biogeography of crocodylians from the Miocene of Panama". Journal of Vertebrate Paleontology. 33 (2): 239. Bibcode:2013JVPal..33..239H. doi:10.1080/02724634.2012.713814. S2CID 83972694.
11. ^ a b Paula Bona; Martín D. Ezcurra; Francisco Barrios; María V. Fernandez Blanco (2018). "A new Palaeocene crocodylian from southern Argentina sheds light on the early history of caimanines". Proceedings of the Royal Society B: Biological Sciences. 285 (1885) 20180843. doi:10.1098/rspb.2018.0843. PMC 6125902. PMID 30135152.
12. ^ Walter J, Darlim G, Massonne T, Aase A, Frey E, Rabi M (2022). "On the origin of Caimaninae: insights from new fossils of Tsoabichi greenriverensis and a review of the evidence". Historical Biology. 34 (4): 580–595. doi:10.1080/08912963.2021.1938563. S2CID 238723638.

v t e Extant Crocodilian species
Kingdom: Animalia Phylum: Chordata Class: Reptilia (unranked): Archosauria Superorder: Crocodylomorpha
Family Alligatoridae (Alligators and caimans) Alligatorinae(Alligators) Alligator American alligator (A. mississippiensis) Chinese alligator (A. sinensis) Caimaninae(Caimans) Caiman Spectacled caiman (C. crocodilus) Broad-snouted caiman (C. latirostris) Yacare caiman (C. yacare) Melanosuchus Black caiman (M. niger) Paleosuchus Cuvier's dwarf caiman (P. palpebrosus) Smooth-fronted caiman (P. trigonatus)
Family Crocodylidae (True crocodiles) Crocodylinae Crocodylus American crocodile (C. acutus) Hall's New Guinea crocodile (C. halli) Orinoco crocodile (C. intermedius) Freshwater crocodile (C. johnstoni) Philippine crocodile (C. mindorensis) Morelet's crocodile (C. moreletii) Nile crocodile (C. niloticus) New Guinea crocodile (C. novaeguineae) Mugger crocodile (C. palustris) Saltwater crocodile (C. porosus) Borneo crocodile (C. raninus) Cuban crocodile (C. rhombifer) Siamese crocodile (C. siamensis) West African crocodile (C. suchus) Osteolaeminae Mecistops West African slender snouted crocodile (Mecistops cataphractus) Central African slender-snouted crocodile (Mecistops leptorhynchus) Osteolaemus Dwarf crocodile (O. tetraspis) Osborn’s dwarf crocodile (O. osborni)
Family Gavialidae Gavialis Gharial (G. gangeticus) Tomistoma False gharial (T. schlegelii)
Reptiles portal

v t e Extinct crocodilians
Kingdom: Animalia Phylum: Chordata Class: Sauropsida Clade: Pseudosuchia Clade: Eusuchia Pseudosuchia see Pseudosuchia Neosuchia see Neosuchia Crocodilia see below↓
Basal crocodilians Mekosuchinae Australosuchus? Baru Harpacochampsa? Kalthifrons Kambara Mekosuchus Paludirex Quinkana? Trilophosuchus Ultrastenos Volia Others Albertosuchus Arenysuchus? Asiatosuchus Borealosuchus? Brachyuranochampsa Charactosuchus "Crocodylus" acer "Crocodylus" affinis Portugalosuchus? Pristichampsus? Prodiplocynodon Planocraniidae?
Alligatoroidea Alligatoroidea Deinosuchus? Diplocynodon? Leidyosuchus? Listrognathosuchus Globidonta Albertochampsa Arambourgia Brachychampsa Ceratosuchus Deinosuchus? Eocaiman Hassiacosuchus Leidyosuchus? Navajosuchus Procaimanoidea? Stangerochampsa Orientalosuchina Dongnanosuchus Eoalligator Eurycephalosuchus Jiangxisuchus Krabisuchus Orientalosuchus Protoalligator Alligatoridae Balanerodus? Lianghusuchus? Menatalligator? Sajkanosuchus? Alligatorinae Akanthosuchus? Allognathosuchus Arambourgia? Ceratosuchus? Chrysochampsa Hassiacosuchus? Navajosuchus? Procaimanoidea? Wannaganosuchus? Alligator A. hailensis A. mcgrewi A. mefferdi A. munensis A. olseni A. prenasalis A. thomsoni Caimaninae Acresuchus Bottosaurus Brachychampsa? Centenariosuchus Ceratosuchus? Chinatichampsus Culebrasuchus Eocaiman? Globidentosuchus Gnatusuchus Kuttanacaiman Mourasuchus Necrosuchus Orthogenysuchus Paranacaiman Paranasuchus Protocaiman Purussaurus Stangerochampsa? Tsoabichi Wannaganosuchus? Melanosuchus M. fisheri M. latrubessei Caiman C. australis C. brevirostris C. gasparinae C. venezuelensis C. wannlangstoni
Longirostres Crocodyloidea Albertosuchus? Antecrocodylus Astorgosuchus Australosuchus? "Crocodylus" affinis? "Crocodylus" megarhinus Jiangxisuchus? Mekosuchinae? Crocodylidae Aldabrachampsus Dzungarisuchus? Oxysdonsaurus? Osteolaeminae Brochuchus "Crocodylus" gariepensis Euthecodon Rimasuchus Kinyang? Crocodylinae "Crocodylus" megarhinus? Kinyang? Quinkana? Tzaganosuchus? Voay Crocodylus C. anthropophagus C. checchiai C. falconensis C. palaeindicus C. sudani C. thorbjarnarsoni Gavialoidea Dollosuchoides Dollosuchus Ferganosuchus Gavialosuchus Gunggamarandu Kentisuchus Leptorrhamphus? Maomingosuchus Maroccosuchus Megadontosuchus Ocepesuchus Paratomistoma Pseudogavialis Thecachampsa Tienosuchus? "Tomistoma" cairense "Tomistoma" lusitanicum Gavialidae Sacacosuchus Tomistominaesensu stricto Brasilosuchus? Gavialosuchus? Melitosaurus Paratomistoma? Thecachampsa? Tomistoma T. calaritanum? T. gaudense? T. lusitanicum? T. taiwanicum? Gavialinaesensu lato Aktiogavialis Dadagavialis Gavialosuchus? Gryposuchus Hanyusuchus Harpacochampsa? Hesperogavialis Ikanogavialis Maomingosuchus? Paratomistoma? Penghusuchus Piscogavialis Rhamphosuchus Siquisiquesuchus Sutekhsuchus "Tomistoma" cairense? "Tomistoma" coppensi Toyotamaphimeia Gavialis G. bengawanicus G. breviceps? G. browni? G. curvirostris? G. leptodus? G. lewisi? G. pachyrhynchus? G. papuensis?
See also: Brevirostres Gryposuchinae

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Taxon identifiers
Caima	Wikidata: Q478759 Wikispecies: Caimaninae EoL: 60776721 NCBI: 1294637 Open Tree of Life: 195671 Paleobiology Database: 194769