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Billingsastraea
Taxonomy
Billingsastraea was named by Grabau (1917). It is not extant.
It was assigned to Phillipsastraeinae by Hill (1956); and to Disphyllidae by Merriam (1974).
It was assigned to Phillipsastraeinae by Hill (1956); and to Disphyllidae by Merriam (1974).
Species
Species lacking formal opinion data
Synonyms
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Synonymy list
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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.
G. †Billingsastraea Grabau 1917
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†Billingsastraea billingsi Calvin 1893
†Billingsastraea nevadensis Stumm 1937
†Billingsastraea nevadensis arachne Merriam 1974
Invalid names: Asterocycles Van-Uxem 1842 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. W. Merriam 1974 | Oliver's (1964) diagnosis is as follows: Astraeoid, thamnastraeoid, or slightly aphroid corals with calices having a central pit and a broad horizontal or reflexed peripheral platform. Septa are radially arranged and lightly to heavily carinate with zigzag or crossbar carinae. Major and minor septa extend from the periphery; minor septa terminate at the outer margin of the tabularium; major septa commonly extend to or almost to the axis. At their peripheral ends the septa abut against those in the adjacent corallite or are con- tinuous into the next corallite. The tabularium is narrow and composed of closely spaced, horizontal complete tabulae. The dissepimentarium is composed of gently to strongly curved dissepiments that are horizontally arranged except next to the tabularia where they are inclined toward the corallite axes. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| Reference: Kiessling 2004 | |||||
Age range: base of the Lochkovian to the top of the Givetian or 419.20000 to 382.70000 Ma
Collections (8 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Lochkovian - Pragian | Australia (New South Wales) | B. aperta, B. speciosa (25699) | |
| Emsian - Eifelian | Canada (Ontario) | B. sp., B. rugosa, B. n. sp. A (40039) | |
| Eifelian | USA (Kentucky) | Billingsastraea indet., B. yandelli (76992) | |
| Givetian | USA (Ohio) | B. longicarinata (38452 38453 38454 38455 38456) |