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Austrotindaria antiqua
Taxonomy
Austrotindaria antiqua was named by Foster et al. (2017). Its type specimen is NHMUK PI MB 1240 (right valve) and is a 3D body fossil. Its type locality is LD-04, Lusitaniadalen, which is in a Griesbachian marine siltstone in the Vikinghøgda Formation of Svalbard and Jan Mayen.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2017 | Austrotindaria antiqua Foster et al. p. 858 fig. 5 |
| 2019 | Austrotindaria antiqua Foster et al. p. 621 fig. 6B |
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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.
†Austrotindaria antiqua Foster et al. 2017
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| W. J. Foster et al. 2017 | Shell small, smooth except for concentric growth lines, subtrigonal, inequilateral, prosogyrate; taxodont hinge dentition with more than 50% fewer anterior than posterior ones, obtusely chevron-shaped teeth, hinge plate interrupted below the beak by an edentulous gap, a small rounded triangular pit below the edentulous gap; ligament opisthodetic.
Equivalve, inequilateral shell with a subtrigonal outline and a beak positioned approximately 30% along the length of the dorsal margin from the posterior; H/L ratio 0.6–1. Conspicuously tumid. Umbo prosogyrate, prominent, moderately broad, rounded and projects above the hinge margin. Slightly rounded and gently sloping anterodorsal margin. Posterodorsal margin almost straight to slightly rounded, gently sloping, with a slight angled junction with the posterior margin. Ventral margin deeply rounded. Escutcheon short, relatively broad, elliptical; lunule narrow. Shell smooth with fine concentric growth lines; entire inner margin smooth. Small ligament, external, opisthodetic, with a well-defined margin and wellrounded triangular pit seated beneath the edentulous gap. Hinge plate with taxodont teeth in two series, sometimes separated by a narrow, plain area, without resilifer, that is narrow below the beak, broadening towards the anterior and posterior ends. Robust teeth, moderately long and blunt, with more than 50% fewer anterior than posterior ones. Smooth ventral margin. No pallial line, sinus or muscle scars are present. As the size of the shell increases the edentulous gap becomes proportionally smaller and more central, and moves externally. |
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| valve height | 16 | 9.64 | 5.62 | 14.6 | 11.4 | 3.22 |
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| Source: f = family, c = class | |||||
| References: Aberhan et al. 2004, Hendy et al. 2009 | |||||
Age range: Spathian or 251.30000 to 247.20000 Ma
Collections (132 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Changhsingian - Griesbachian | China (Yunnan) | Austrotindaria antiqua (205965 205967 205968) | |
| Changhsingian - Griesbachian | China (Sichuan) | Austrotindaria antiqua (205981) | |
| Griesbachian | China (Sichuan) | Austrotindaria antiqua (205982 205983 205984 205985) | |
| Griesbachian | USA (Wyoming) | Unionites fassaensis (105378 105382 105386) | |
| Griesbachian | Hungary | Unionites fassaensis (177373 177377 177379 177380 177381 177382 177383 177384 177385 177386 177390) | |
| Griesbachian | China (Guizhou) | Austrotindaria antiqua (200985 200989 200990 201001 205960 205991 205994 205995 205996) | |
| Griesbachian | Italy (Trentino) | Austrotindaria antiqua (197819 197820 197821 197823 197873 197874 197875 197876) | |
| Griesbachian | Russian Federation | Unionites fassaensis (90207) | |
| Griesbachian | Italy | Unionites fassaensis (165006 165007 165008 165009 165010 165011 165012 165013 165015 165102 165103 165104 165105) | |
| Griesbachian | Svalbard and Jan Mayen | Austrotindaria antiqua (type locality: 182611 182612) | |
| Griesbachian | China (Yunnan) | Austrotindaria antiqua (205971 205972) | |
| Smithian | Italy (Trentino) | Austrotindaria antiqua (197800 197801 197802 197856 197858 197863 197865) | |
| Smithian | Hungary | Unionites fassaensis (177410 177412 177415 177416 177417 177419 177420 177421 177422 177423) | |
| Smithian | Hungary (Hungary) | Unionites fassaensis (174228) | |
| Smithian | Italy | Unionites fassaensis (165131 165132 165133 165136 165137 165138 165139 165140 165143 165144 165146 165147 165148 165149) | |
| Spathian | Italy | Unionites fassaensis (165150 165151 165157) | |
| Spathian | Hungary | Unionites fassaensis (177450 177451) | |
| Dienerian | Italy (Trentino) | Austrotindaria antiqua (197836 197841 197842 197845 197848 197849) | |
| Dienerian | Hungary | Unionites fassaensis (177391 177392 177393 177394 177396 177397 177398 177399 177400 177402 177403 177404 177405 177407 177409) | |
| Dienerian | Russian Federation | Unionites fassaensis (90209 90211) | |
| Dienerian | Italy | Unionites fassaensis (165017 165020 165022 165024 165114 165116 165117 165119 165121 165122 165126 165127 165129 165134 165135) |