Project 5325: C. A. Brochu. 1999. Phylogenetics, Taxonomy, and Historical Biogeography of Alligatoroidea. Journal of Vertebrate Paleontology. 19 (sup002):9-100.
Specimen: † Borealosuchus wilsoni (unvouchered)
View: Part (fossil)

Abstract

Alligatoroidea, a stem-based group including living alligators and caimans and all taxa closer to them than to Crocodylus or Gavialis, includes seven living species and a large diversity of extinct taxa extending back to the Campanian (Late Cretaceous). Parsimony analysis of 164 discrete morphological characters supports several previous hypotheses based on morphology and molecules: Diplocynodon, from the European Tertiary, is a monophyletic alligatoroid lineage; Brachychampsa and Stangerochampsa are derived alligatoroid taxa but not demonstrably within the crown-group Alligatoridae; and, within the crown-group, caimans form a robust clade. However, this study indicates the paraphyly of “Allognathosuchus;” the alligatoroid affinities of Leidyosuchus canadensL but not of most other “Leidyosuchus;” the very distant relationship between Hylaeochampsa and any extant crocodylian lineage, including Alligatoroidea; and the fact that Diplocynodon must extend at least as far as the Campanian, even though the oldest well-known Diplocynodon are from the Eocene. This work supports a close relationship between Diplocynodon and Baryphracta deponiae from the Eocene of Germany; monophyly of Alligator and the caiman assemblage as currently applied in the literature; the caiman affinities of the bizarre nettosuchids and Purussaurus; and a closer relationship between Caiman latirostris and Melanosuchus niger than between C. latirostris and other Caiman. Phylogenetic taxonomic principles have been applied to Crocodylia by several workers, and this study expands upon this with a discussion of phylogeny-based name definitions for Crocodylia and nested subgroups. Leidyosuchus is the basalmost alligatoroid, but within its sister taxon we can recognize a pair of stem-based groups—Diplocynodontinae (Diplocynodon rateili and all taxa closer to it than to Alligator mississippiensis) and Globidonta (Alligator mississippiensis and all taxa closer to it than to Diplocynodon rateili). The crown-group Alligatoridae (last common ancestor of Alligator, Caiman, Melanosuchus, and Paleosuchus and all of its descendents) can likewise be split into a pair of stem-based daughter lineages: Alligatorinae (Alligator and taxa closer to it than to Caiman) and Caimaninae (Caiman and taxa closer to it than to Alligator). Salt intolerance has been used by previous authors to force alligatorid dispersal along land bridges. Despite the problem of inappropriate climate, a land crossing across Beringia during the Late Tertiary best explains the current existence of an Asiatic alligatorid (Alligator sinensis), but based on known fossil occurrences, caimans and alligators diverged from each other in North America sometime during the Late Cretaceous and spread to South America by the Paleocene, when North and South America were separated. A single dispersal event at or near the Cretaceous-Tertiary Boundary is sufficient to explain the presence of caimans in South America, with a reinvasion from South America explaining the presence of a nettosuchid in the North American Eocene (Orthogenysuchus).


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Article DOI: 10.1080/02724634.1999.10011201

Project DOI: 10.7934/P5325, http://dx.doi.org/10.7934/P5325
This project containsMatrices
  • 6 Media
  • 1 Matrix
  • 1 Document
  • 70 Taxa
  • 6 Specimens
  • 164 Characters
Total size of project's media files: 12.06M

Download Project SDD File
Total scored cells: 7636
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 164
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 376
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:164/0
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MorphoBank Project 5325
  • Creation Date:
    30 June 2024
  • Publication Date:
    02 July 2024

    This research
    supported by

    Authors' Institutions

    • University of Texas at Austin



    Members

    member name taxa specimens media chars character
    media
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    (scored, NPA, "-")
    cell
    medialabels
    rules
    Shreya Jariwala
    Project Administrator
    7066164007636
    (7636, 0, 0)
    000


    Taxonomic Overview for Matrix 'M29927' (70 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
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    NPA
    cells
    "-" cellscell images labels on
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    [1] † Bernissartia fagesii
    Taxon name last Modified on 06/30/24
    74909000001
    [2] † Pachycheilosuchus trinquei
    Taxon name last Modified on 06/30/24
    68969600001
    [3] † Hylaeochampsa vectiana
    Taxon name last Modified on 06/30/24
    104606000001
    [4] † Borealosuchus formidabilis
    Taxon name last Modified on 06/30/24
    2214214200001
    [5] † Borealosuchus wilsoni
    Taxon name last Modified on 06/30/24
    5610810800001
    [6] † Borealosuchus acutidentatus
    Taxon name last Modified on 06/30/24
    114505000001
    [7] † Borealosuchus sternbergii
    Taxon name last Modified on 06/30/24
    2414014000001
    [8] † Leidyosuchus canadensis
    Taxon name last Modified on 06/30/24
    5810610600001
    [9] † Thoracosaurus macrorhynchus
    Taxon name last Modified on 06/30/24
    5810610600001
    [10] † Eogavialis africanus
    Taxon name last Modified on 06/30/24
    5910510500001
    [11] † Gryposuchus colombianus
    Taxon name last Modified on 06/30/24
    5011411400001
    [12] † Gavialis lewisi
    Taxon name last Modified on 06/30/24
    96686800001
    [13] Gavialis gangeticus
    Taxon name last Modified on 06/30/24
    216216200001
    [14] † Pristichampsus vorax
    Taxon name last Modified on 06/30/24
    4811611600001
    [15] † Diplocynodon hantoniensis
    Taxon name last Modified on 06/30/24
    3413013000001
    [16] † Diplocynodon ratelii
    Taxon name last Modified on 06/30/24
    3812612600001
    [17] † Diplocynodon darwini
    Taxon name last Modified on 06/30/24
    3313113100001
    [18] † Baryphracta deponiae
    Taxon name last Modified on 06/30/24
    84808000001
    [19] † Stangerochampsa mccabei
    Taxon name last Modified on 06/30/24
    5211211200001
    [20] † Brachychampsa montana
    Taxon name last Modified on 06/30/24
    2513913900001
    [21] † Brachychampsa sealeyi
    Taxon name last Modified on 06/30/24
    109555500001
    [22] Alligator sinensis
    Taxon name last Modified on 06/30/24
    316116100001
    [23] Alligator mississippiensis
    Taxon name last Modified on 06/30/24
    016416400001
    [24] † Alligator mefferdi
    Taxon name last Modified on 06/30/24
    5710710700001
    [25] † Alligator olseni
    Taxon name last Modified on 06/30/24
    5810610600001
    [26] † Alligator mcgrewi
    Taxon name last Modified on 06/30/24
    2414014000001
    [27] † Alligator prenasalis
    Taxon name last Modified on 06/30/24
    3313113100001
    [28] † Ceratosuchus burdoshi
    Taxon name last Modified on 06/30/24
    105595900001
    [29] † Allognathosuchus haupti
    Taxon name last Modified on 06/30/24
    81838300001
    [30] † Allognathosuchus polyodon
    Taxon name last Modified on 06/30/24
    101636300001
    [31] † Allognathosuchus wartheni
    Taxon name last Modified on 06/30/24
    4312112100001
    [32] † Allognathosuchus mooki
    Taxon name last Modified on 06/30/24
    69959500001
    [33] † Wannaganosuchus brachymanus
    Taxon name last Modified on 06/30/24
    76888800001
    [34] † Procaimanoidea kayi
    Taxon name last Modified on 06/30/24
    6010410400001
    [35] † Arambourgia gaudryi
    Taxon name last Modified on 06/30/24
    91737300001
    [36] † Eocaiman cavernensis
    Taxon name last Modified on 06/30/24
    138262600001
    [37] † Purussaurus neivensis
    Taxon name last Modified on 06/30/24
    4212212200001
    [38] † Orthogenysuchus olseni
    Taxon name last Modified on 06/30/24
    139252500001
    [39] † Mourasuchus
    Taxon name last Modified on 06/30/24
    5610810800001
    [40] Caiman yacare
    Taxon name last Modified on 06/30/24
    016416400001
    [41] Caiman crocodilus
    Taxon name last Modified on 06/30/24
    016416400001
    [42] Caiman latirostris
    Taxon name last Modified on 06/30/24
    515915900001
    [43] † Caiman lutescens
    Taxon name last Modified on 06/30/24
    117474700001
    [44] † Melanosuchus fisheri
    Taxon name last Modified on 06/30/24
    112525200001
    [45] Melanosuchus niger
    Taxon name last Modified on 06/30/24
    316116100001
    [46] Palaeosuchus trigonatus
    Taxon name last Modified on 06/30/24
    116316300001
    [47] Palaeosuchus palpebrosus
    Taxon name last Modified on 06/30/24
    416016000001
    [48] † Deinosuchus
    Taxon name last Modified on 06/30/24
    97676700001
    [49] Crocodylus cataphractus
    Taxon name last Modified on 06/30/24
    316116100001
    [50] Crocodylus niloticus
    Taxon name last Modified on 06/30/24
    016416400001
    [51] Crocodylus porosus
    Taxon name last Modified on 06/30/24
    016416400001
    [52] Crocodylus rhombifer
    Taxon name last Modified on 06/30/24
    016416400001
    [53] † Crocodylus palaeindicus
    Taxon name last Modified on 06/30/24
    5411011000001
    [54] Osteolaemus tetraspis
    Taxon name last Modified on 06/30/24
    316116100001
    [55] † Crocodylus robustus
    Taxon name last Modified on 06/30/24
    4112312300001
    [56] † Crocodylus lloidi
    Taxon name last Modified on 06/30/24
    91737300001
    [57] † Crocodylus megarhinus
    Taxon name last Modified on 06/30/24
    67979700001
    [58] † Euthecodon arambourgii
    Taxon name last Modified on 06/30/24
    96686800001
    [59] Tomistoma schlegelii
    Taxon name last Modified on 06/30/24
    016416400001
    [60] † Tomistoma lusitanica
    Taxon name last Modified on 06/30/24
    66989800001
    [61] † Gavialosuchus americanus
    Taxon name last Modified on 06/30/24
    4611811800001
    [62] † Tomistoma cairense
    Taxon name last Modified on 06/30/24
    94707000001
    [63] † Crocodylus spenceri
    Taxon name last Modified on 06/30/24
    89757500001
    [64] † Brachyuranochampsa eversolei
    Taxon name last Modified on 06/30/24
    101636300001
    [65] † Crocodylus depressifrons
    Taxon name last Modified on 06/30/24
    4711711700001
    [66] † Crocodylus acer
    Taxon name last Modified on 06/30/24
    90747400001
    [67] † Crocodylus affinis
    Taxon name last Modified on 06/30/24
    2114314300001
    [68] † Asiatosuchus germanicus
    Taxon name last Modified on 06/30/24
    5311111100001
    [69] † Prodiplocynodon langi
    Taxon name last Modified on 06/30/24
    98666600001
    [70] † Australosuchus clarkae
    Taxon name last Modified on 06/30/24
    6110310300001


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    Document downloads1Brochu 1999 (Original PBDB Matrix) (1 download);
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