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Osteolaeminae

Subfamily of crocodiles From Wikipedia, the free encyclopedia

Osteolaeminae
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Osteolaeminae is a subfamily of true crocodiles within the family Crocodylidae containing the dwarf crocodiles and slender-snouted crocodiles, and is the sister taxon to Crocodylinae.

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Taxonomy

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Osteolaeminae was named by Christopher Brochu in 2003 as a subfamily of Crocodylidae separate from Crocodylinae, and is cladistically defined as Osteolaemus tetraspis (the Dwarf crocodile) and all crocodylians more closely related to it than to Crocodylus niloticus (the Nile crocodile).[2][3] This is a stem-based definition, and is the sister taxon to Crocodylinae. Osteolaeminae contains the two extant genera Osteolaemus and Mecistops, along with several extinct genera, although the number of extant species within Osteolaeminae is currently in question.[4]

Phylogeny

The cladogram below is based on two studies that combined morphological, molecular (DNA sequencing), and stratigraphic (fossil age) data.[5][6] Recently recognised species (M. leptorhynchus, C. halli and the third Osteolaemus species) placed according to 2023 study by Sales-Oliveira et al.[7]

Crocodylidae
Osteolaeminae

Brochuchus

Rimasuchus

Osteolaemus osborni Osborn's dwarf crocodile

Osteolaemus tetraspis Dwarf crocodile

Osteolaemus sp. West

Crocodylinae
Voay

Voay robustus

Crocodylus

Crocodylus johnstoni Freshwater crocodile

Crocodylus novaeguineae New Guinea crocodile

Crocodylus halli Hall's New Guinea crocodile

Crocodylus mindorensis Philippine crocodile

Crocodylus porosus Saltwater crocodile

Crocodylus siamensis Siamese crocodile

Crocodylus palustris Mugger crocodile

Crocodylus suchus West African crocodile

Crocodylus niloticus Nile crocodile

Crocodylus rhombifer Cuban crocodile

Crocodylus intermedius Orinoco crocodile

Crocodylus acutus American crocodile

Crocodylus moreletii Morelet's crocodile

(crown group)

Alternatively, other morphological studies have recovered Mecistops as a basal member of Crocodylinae, more closely related to Crocodylus than to Osteolaemus and the other members of Osteolaeminae,[3][8] as shown in the cladogram below.[8]

Crocodylidae
Osteolaeminae
Crocodylinae

Mecistops cataphractus West African slender-snouted crocodile

Crocodylus niloticus Nile crocodile

Crocodylus checchiai

Crocodylus moreletii Morelet's crocodile

Crocodylus intermedius Orinoco crocodile

Crocodylus acutus American crocodile

Crocodylus rhombifer Cuban crocodile

Crocodylus palaeindicus

Crocodylus palustris Mugger crocodile

Crocodylus ossifragus

Crocodylus siamensis Siamese crocodile

Crocodylus mindorensis Philippine crocodile

Crocodylus johnstoni Freshwater crocodile

Crocodylus porosus Saltwater crocodile

Crocodylus raninus Borneo crocodile

Crocodylus novaeguineae New Guinea crocodile  

Paleoafrican Crocodylus
Neotropical Crocodylus
Indo-Pacific Crocodylus

Species list

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References

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