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Orbiculoidea xinguensis
Taxonomy
Orbiculoidea xinguensis was named by Corrêa and Ramos (2020). Its type specimen is MPEG-3729, a valve (dorsal valve), and it is a 3D body fossil.
Sister species lacking formal opinion data
O. baini, O. bodenbenderi, O. cellulosa, O. collis, O. convexa, O. davreuxiana, O. discoides, O. doria, O. elongata, O. eximia, O. falklandensis, O. grandis, O. hartii, O. herzeri, O. inaequalis, O. inaequalis, O. intermedia, O. kadzielniensis, O. katzeri, O. lamellosa, O. latissima, O. limata, O. lodensis, O. lodiensis, O. lodiensis, O. meekana, O. molina, O. montis, O. moorefieldana, O. newberryi, O. numulus, O. pelopea, O. pilidium, O. portlocki, O. portlockiana, O. rugata, O. schallochensis, O. sinensis, O. sodalis, O. squammosa, O. subcircularis, O. subplana, O. tarda, O. telleri, O. tenuistriata, O. tenulineata, O. tornacensis, O. townshendi, O. truncata, O. tullia, O. vanuxemi, O. wardi, O. yichangensis
Synonymy list
| Year | Name and author |
|---|---|
| 2020 | Orbiculoidea xinguensis Corrêa and Ramos figs. Fig. 4. A – E, Fig. 5. A – D |
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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.
†Orbiculoidea xinguensis Corrêa and Ramos 2020
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. F. A. Corrêa and M. I. F. Ramos 2020 | Convex flat shell, almost subtriangular in outline. The anterior margin is broader than the posterior margin. Dorsal valve high and convex, umbo well marked. Apex flattened, submarginal, displaced towards the posterior margin. The ventral valve is flat, with a slight elevation in the umbo region. Listrium short, cylindrical, covering the pedicle track completely. Thin rugellae, with small and regular interspaces arranged in both valves. |
Measurements
No measurements are available
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| Source: g = genus, o = order, c = class, uc = unranked clade | |||||
| References: Hendy 2009, Aberhan et al. 2004, Nesnidal et al. 2013 | |||||
Age range: Lochkovian or 419.62000 to 413.02000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Lochkovian | Brazil (Para) | Orbiculoidea xinguensis (214948 214949 214950) |