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Unionites subrectus
Taxonomy
Anodontophora subrecta was named by Bittner (1901) [= Triaphorus aff. multiformis Kiparisova sensu Kumagae & Nakazawa 2009: 171, fig. 145, 18–25.]. It is a 3D body fossil. Its type locality is Vámos-Katrabocza, which is in a Ladinian carbonate limestone in Hungary.
It was recombined as Unionites subrectus by Vörös (1987) and Foster et al. (2017).
It was recombined as Unionites subrectus by Vörös (1987) and Foster et al. (2017).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1901 | Anodontophora subrecta Bittner p. 100 figs. pl. 7, figs 28–30. |
| 1987 | Unionites subrectus Vörös |
| 2017 | Unionites subrectus Foster et al. p. 862 fig. 8 |
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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.
†Unionites subrectus Bittner 1901
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| W. J. Foster et al. 2017 | Outline elongate-elliptical. Shell equivalved, inflated below the umbo, and inequilateral with beak positioned approximately 85% along the length of the dorsal margin from the posterior. Lower part of anterior dorsal margin projects slightly beyond plane of commissure. Posterodorsal margin is almost straight to slightly round and gently sloping. Lunule is long and narrow, with deeply impressed escutcheon. Umbo is prosogyrate and rises above the hinge margin. Ornamented withfine concentric growth lines. The entire inner margin is smooth. Prodissoconch is smooth and orbicular.
A small subumbonal groove limits the shell projection posteriorly. Short lateral tooth, left valve possesses a weak secondary ridge creating a shallow socket. Hinge of left valve has an anterior platform that bears a depression for the corresponding anterior hinge margin of the right valve; posterior to this is a small, tuberculiform subumbonal tooth fitting above posterior lateral tooth of right valve. Ligament is fixed to a nymph, which extends about half the length of the posterior dorsal margin. Isomyarian muscle scars with a deeply impressed anterior adductor muscle scar |
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| valve height | 28 | 7.21 | 3.40 | 11.8 | 7.85 | 2.12 |
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| Source: c = class | |||||
| Reference: Aberhan et al. 2004 | |||||
Collections (16 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Induan | Svalbard and Jan Mayen | Anodontophora subrecta (212933 212966) | |
| Griesbachian | Svalbard and Jan Mayen | Unionites subrectus (182611 182612) | |
| Griesbachian | Greenland | Anodontophora subrecta (48115) | |
| Griesbachian | Russian Federation | Triaphorus multiformis (90207) | |
| Smithian | Russian Federation | Triaphorus multiformis (90220 90221) | |
| Anisian | Hungary | Anodontophora subrecta (203401) | |
| Anisian | Hungary (Veszprem) | Unionites subrectus (43725 43730 44292) | |
| Pelsonian | Hungary (Mecsek) | Unionites subrectus (197096) | |
| Ladinian | Hungary (Bakony) | Anodontophora subrecta (type locality: 203348) | |
| Norian - Rhaetian | Russian Federation | Anodontophora subrecta (39315) | |
| Lacian | Russian Federation | Anodontophora subrecta (39313) |