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Meiolaniformes
Discussion
Meiolaniformes is the stem-based definition of Meiolaniidae. Meiolaniformes refers to all the taxa more related to Meiolania platyceps than to Cryptodira or Pleurodira
Taxonomy
Meiolaniformes was named by Sterli and de la Fuente (2013). It was considered monophyletic by Sterli (2015).
It was assigned to Testudines by Rhodin et al. (2015); to Testudinata by Sterli and de la Fuente (2013), Perea et al. (2014), Gasparini et al. (2015), Sterli (2015), Sterli et al. (2015), Sterli et al. (2015); and to Perichelydia by Joyce (2017), Sterli and de la Fuente (2019).
It was assigned to Testudines by Rhodin et al. (2015); to Testudinata by Sterli and de la Fuente (2013), Perea et al. (2014), Gasparini et al. (2015), Sterli (2015), Sterli et al. (2015), Sterli et al. (2015); and to Perichelydia by Joyce (2017), Sterli and de la Fuente (2019).
Synonymy list
| Year | Name and author |
|---|---|
| 2013 | Meiolaniformes Sterli and de la Fuente |
| 2014 | Meiolaniformes Perea et al. |
| 2015 | Meiolaniformes Gasparini et al. |
| 2015 | Meiolaniformes Rhodin et al. |
| 2015 | Meiolaniformes Sterli |
| 2015 | Meiolaniformes Sterli et al. |
| 2017 | Meiolaniformes Joyce |
| 2019 | Meiolaniformes Sterli and de la Fuente |
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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.
Unr. †Meiolaniformes Sterli and de la Fuente 2013
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Fm. †Meiolaniidae Lydekker 1887
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G. †Meiolania Owen 1886
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†Meiolania brevicollis Megirian 1992
†Meiolania mackayi Anderson 1925
†Meiolania platyceps Owen 1886
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Invalid names: Ceratochelys sthenurus Huxley 1887 [objective synonym], Ceratochelys sthenurus Huxley 1887 [objective synonym], Meiolania minor Owen 1886 [synonym], Meiolania minor Owen 1886 [synonym]
Invalid names: Miolaniidae [synonym]
G. †Patagoniaemys Sterli and de la Fuente 2011
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†Patagoniaemys gasparinae Sterli and de la Fuente 2011
G. †Peligrochelys Sterli and de la Fuente 2013
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†Peligrochelys walshae Sterli and de la Fuente 2013
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Sterli 2015 | Representatives of Meiolaniformes are currently diagnosed relative to other turtles by the presence of a large prefrontal exposure, a lack of a frontal contribution to the orbit, the presence of a ventral crest on the vomer, a crista supraoccipitalis that extends posteriorly well beyond the foramen magnum, formed cervical vertebrae, opisthocoelous vertebrae in the anterior part of the tail, randomly distributed small pits on the surface of the dermal bones of the skull and shell and anteriorly inflected marginal scute sulci along the carapacial margin | |
| J. Sterli and M. S. de la Fuente 2019 | It differs from the basal members of Testudinata (taxa outside Perichelydia clade) by the reduction of the processus interfenestralis of the opisthotic, absence of the processus basitrabecularis, and an enclosed canalis cavernosus. |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum, uc = unranked clade | |||||
| References: Kiessling 2004, Hendy et al. 2009, Carroll 1988 | |||||
Age range: base of the Late/Upper Aptian to the top of the Holocene or 119.57000 to 0.00000 Ma
Collections (86 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Aptian | Argentina (Chubut) | Chubutemys copelloi (38530) Meiolaniformes indet. (154711) | |
| Early/Lower Albian | Australia (Victoria) | Testudines indet. (38534 38537 38542) | |
| Late/Upper Campanian - Early/Lower Maastrichtian | Argentina (Río Negro) | Meiolaniformes indet. (139574 185025) Meiolaniidae indet. (145698) Niolamia sp. (45087) | |
| Late/Upper Campanian - Early/Lower Maastrichtian | Argentina (Mendoza) | Chelidae indet. (185024) | |
| Early/Lower Maastrichtian | Argentina (Santa Cruz) | Meiolaniformes indet. (227006) | |
| Maastrichtian | Argentina (Chubut) | Meiolaniformes indet. (208386 208395 208409 208414 208420 208425 208430) Meiolaniidae indet. (99438) Patagoniaemys gasparinae (133651 166582 166583 206174 206175 206176 206177 206178 206179 206180 208387 208388 208390 208418 224258) | |
| Danian | Argentina (Chubut) | Meiolaniformes indet. (208450) Peligrochelys walshae (95914 200060 200061 200062 200063 200064 200065 200066 200067 200068 200069 200070 200071 200072 200073 200074 200075 200076 200077 200078 208464) | |
| Casamayoran | Argentina (Chubut) | Crossochelys corniger (39295) | |
| Lutetian | Argentina (Chubut) | Gaffneylania auricularis (208475 208477) | |
| Middle Eocene | Argentina (Chubut) | Gaffneylania auricularis (142929) Meiolaniidae indet. (185026) Niolamia argentina (185027) | |
| Middle Eocene - Late/Upper Eocene | Australia (Queensland) | Meiolaniidae indet. (143208) | |
| Late/Upper Oligocene | Australia (Queensland) | Warkalania carinaminor (143358) | |
| Late/Upper Oligocene | Australia (South Australia) | Meiolaniidae indet. (137261) | |
| Late/Upper Oligocene - Early/Lower Miocene | Australia (South Australia) | Meiolaniidae indet. (13313 135688) | |
| Altonian | New Zealand (South Island) | Testudines indet. (153884) | |
| Middle Miocene | Australia (Northern Territory) | Meiolania brevicollis (92839) | |
| Middle Miocene | Australia (Queensland) | Meiolaniidae indet. (181913) | |
| Pliocene | Australia (New South Wales) | Meiolaniidae indet. (95862) | |
| Pliocene | Australia (Queensland) | Meiolaniidae indet. (238634) | |
| Pleistocene | Australia (South Australia) | Meiolania sp. (135983) | |
| Pleistocene | Australia (New South Wales) | Meiolania oweni (238636) Meiolania platyceps (185435 185436 185437 185438 185439) Meiolania platyceps, Meiolania minor, Ceratochelys sthenurus (185430) | |
| Pleistocene | Australia (Queensland) | Meiolania oweni (135914) Meiolaniidae indet. (136724) | |
| Pleistocene | New Caledonia (Isle of Pines) | Meiolania mackayi (185433) | |
| Middle Pleistocene - Late/Upper Pleistocene | Australia (Queensland) | Meiolania platyceps (183080) | |
| Late/Upper Pleistocene | New Caledonia (Lifu) | Meiolaniidae indet. (185432) | |
| Holocene | New Caledonia | Meiolaniidae indet. (13221) |