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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) and Sterli et al. (2015); and to Perichelydia by Joyce (2017) and 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) and Sterli et al. (2015); and to Perichelydia by Joyce (2017) and 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: Hendy et al. 2009, Carroll 1988 | |||||
Age range: base of the Late/Upper Aptian to the top of the Holocene or 122.46000 to 0.00000 Ma
Collections (119 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 (Mendoza) | Chelidae indet. (185024) | |
| Late/Upper Campanian - Early/Lower Maastrichtian | Argentina (Río Negro) | Meiolaniformes indet. (139574 185025) Meiolaniidae indet. (145698) Niolamia sp. (45087) | |
| Maastrichtian | Argentina (Chubut) | Meiolaniformes indet. (208386 208390 208395 208409 208414 208420 208425 208430 231272 231350 231353 231354 231359 231363 231364 231374 231375 231378 231388 231403 231409 231411 231448 231449 231450 231451 231486 231491 231500 231518 231521 231590 231610 231632 231634 231639 231642 231653 231656 231754 231758 233607 233643) Meiolaniidae indet. (99438) Patagoniaemys gasparinae (133651 166582 166583 206174 206175 206176 206177 206178 206179 206180 208387 208388 224258) Patagoniaemys sp. (231292 231360) | |
| Early/Lower Maastrichtian | Argentina (Santa Cruz) | Meiolaniformes indet. (227006) | |
| 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 (South Australia) | Meiolaniidae indet. (137261) | |
| Late/Upper Oligocene | Australia (Queensland) | Warkalania carinaminor (143358) | |
| Late/Upper Oligocene - Early/Lower Miocene | Australia (South Australia) | Meiolaniidae indet. (135688) | |
| Altonian | New Zealand (South Island) | Testudines indet. (153884) | |
| Middle Miocene | Australia (Queensland) | Meiolaniidae indet. (181913) | |
| Middle Miocene | Australia (Northern Territory) | Meiolania brevicollis (92839) | |
| Pliocene | Australia (New South Wales) | Meiolaniidae indet. (95862) | |
| Pleistocene | Australia (Queensland) | Meiolania oweni (135914) Meiolaniidae indet. (136724) | |
| Pleistocene | Australia (New South Wales) | Meiolania platyceps (185435 185436 185437 185438 185439) Meiolania platyceps, Meiolania minor, Ceratochelys sthenurus (185430) | |
| Pleistocene | New Caledonia (Isle of Pines) | Meiolania mackayi (185433) | |
| Pleistocene | Australia (South Australia) | Meiolania sp. (135983) | |
| 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) |