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Hypergonia percostata
Taxonomy
Taosia percostata was named by Girty (1939). It is not a trace fossil.
It was recombined as Stegocoelia (Taosia) percostata by Kues (1991); it was recombined as Stegocoelia (Hypergonia) percostata by Batten (1995), Kulas and Batten (1997), Kues and Batten (2001); it was recombined as Hypergonia percostata by Wagner (2023).
It was recombined as Stegocoelia (Taosia) percostata by Kues (1991); it was recombined as Stegocoelia (Hypergonia) percostata by Batten (1995), Kulas and Batten (1997), Kues and Batten (2001); it was recombined as Hypergonia percostata by Wagner (2023).
Synonymy list
| Year | Name and author |
|---|---|
| 1939 | Taosia percostata Girty |
| 1967 | Taosia percostata Yochelson and Saunders p. 1967 fig. 213 |
| 1991 | Stegocoelia (Taosia) percostata Kues p. 227 fig. 3.13 |
| 1995 | Stegocoelia (Hypergonia) percostata Batten p. 22 fig. 30 |
| 1997 | Stegocoelia (Hypergonia) percostata Kulas and Batten p. 49 figs. pl. 3 f. 10A-B |
| 2001 | Stegocoelia (Hypergonia) percostata Kues and Batten p. 48 figs. 9.4-9.5 |
| 2023 | Hypergonia percostata Wagner p. 5987 |
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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.
†Hypergonia percostata Girty 1939
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. L. Batten 1995 | Turreted forms with well-developed spiral ornament on base. Upper whorl surface flat to slightly concave. There may or may not be a spiral lirae just below suture. Sutures shallow. Upper margin of selenizone is a spiral cord as is lower margin at periphery. Periphery is either a sharp keel, giving the shell a more turreted appearance, or marked only by lower selenizone margin cord, making the shell whorl profile more rounded. Just below periphery there is a large spiral cord below which the whorls embrace. Two or more spiral cords on the flatly rounded to rounded base. Anomphalus. Columellar lip straight and at juncture with lower lip there may be a siphonal trough. |
Measurements
| part | N | mean | |||||
|---|---|---|---|---|---|---|---|
| shell height | 1 | 3.50 |
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| Source: c = class | |||||
| Reference: Kiessling 2004 | |||||
Age range: base of the Morrowan to the top of the Wuchiapingian or 323.40000 to 254.14000 Ma
Collections (12 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Morrowan | USA (Texas) | Stegocoelia percostata (79966) | |
| Kashirian - Myachkovian | USA (New Mexico) | Stegocoelia percostata (46548) | |
| Desmoinesian | USA (New Mexico) | Stegocoelia percostata (46536) | |
| Gzhelian | USA (New Mexico) | Stegocoelia percostata (156716) Stenocoelia percostata (160176 160177 160178) | |
| Virgilian | USA (New Mexico) | Stegocoelia percostata (156695 156709 156713 156715) | |
| Wuchiapingian | USA (Wyoming) | Stegocoelia percostata (61950) |