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Geragnostus
Taxonomy
Geragnostus was named by Howell (1935) [Sepkoski's age data: O Trem-u O Cara-u Sepkoski's reference number: 1268].
It was assigned to Geragnostinae by Harrington and Leanza (1957); to Agnostidae by Neuman (1964); to Geragnostidae by Robison and Pantoja-Alor (1968); to Metagnostidae by Whittington et al. (1997) and Hoel (1999); and to Agnostida by Sepkoski (2002).
It was assigned to Geragnostinae by Harrington and Leanza (1957); to Agnostidae by Neuman (1964); to Geragnostidae by Robison and Pantoja-Alor (1968); to Metagnostidae by Whittington et al. (1997) and Hoel (1999); and to Agnostida by Sepkoski (2002).
Species
Species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1935 | Geragnostus Howell |
| 1957 | Geragnostus Harrington and Leanza |
| 1964 | Geragnostus Neuman |
| 1968 | Geragnostus Robison and Pantoja-Alor p. 775 |
| 1977 | Neptunagnostella Pek |
| 1997 | Geragnostus Whittington et al. p. 375 |
| 1999 | Geragnostus Hoel |
| 2002 | Geragnostus Sepkoski |
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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. †Geragnostus Howell 1935
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Subg. †Geragnostus (Geragnostella) Kobayashi 1939
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†Geragnostus (Geragnostella) explanatus Tjernvik 1956
†Geragnostus (Geragnostella) tullbergi Novak 1883
†Geragnostus (Geragnostella) wimani Tjernvik 1956
Subg. †Geragnostus (Geragnostus) Howell 1935
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†Geragnostus (Geragnostus) callaveiformis Harrington and Leanza 1957
†Geragnostus (Geragnostus) maurii Harrington and Leanza 1957
†Geragnostus (Geragnostus) nesossii Harrington and Leanza 1957
Subg. †Geragnostus (Microagnostus) Howell 1935
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†Geragnostus (Microagnostus) callaveiformis Harrington and Leanza 1957
†Geragnostus (Microagnostus) calviformis Harrington and Leanza 1957
†Geragnostus (Microagnostus) hoeki Kobayashi 1939
†Geragnostus (Microagnostus) micropeltis Harrington and Leanza 1957
†Geragnostus (Microagnostus) neumanni Harrington and Leanza 1957
†Geragnostus (Microagnostus) tilcuyensis Kobayashi 1937
†Geragnostus (Microagnostus) vilonii Harrington and Leanza 1957
Subg. †Geragnostus (Novoagnostus) Nielsen 1997
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†Geragnostus (Novoagnostus) contractus Zhou et al. 2014
†Geragnostus (Novoagnostus) longicollis Raymond 1925
†Geragnostus boutouryensis Howell 1935
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Invalid names: Geragnostus foulonensis Howell 1935 [synonym], Geragnostus languidus Howell 1935 [synonym], Geragnostus manifestus Howell 1935 [synonym]
†Geragnostus callaveiformis Harrington and Leanza 1957
†Geragnostus crassus Tjernvik 1956
†Geragnostus fabius Billings 1865
†Geragnostus occitanus Howell 1935
Invalid names: Neptunagnostella Pek 1977 [synonym]
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: g = genus, f = family, o = order | |||||
| References: Hendy 2009, Kiessling 2004 | |||||
Age range: base of the Paibian to the top of the Pusgillian or 497.00000 to 449.20000 Ma
Collections (230 total)
Oldest occurrences | |||
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Cambrian | USA (Montana) | G. sp. (258) | |
| Cambrian | USA (Alaska) | G. sp. (114979) | |
| Paibian | USA (Texas) | G. tumidosus (208655 208745) | |
| Trempealeauan | USA (New Mexico) | G. sp. (203892 203893) | |
| Trempealeauan | USA (Utah) | G. subobesus (219670 219671) | |
| Trempealeauan | USA (Nevada) | G. brevis (233789) G. sp. (203998) | |
| Payntonian | Australia (Northern Territory) | G. sp. (77655) | |
| Niuchehean | China (Anhui) | G. sp. (127534) | |
| Niuchehean | China (Jilin Provence) | G. acrolebus, G. bisectus (156921) G. acrolebus, G. bisectus, G. expansa (156924) G. acrolebus, G. bisectus, G. magnus (156922) G. subobesus (156912) | |
| Skullrockian | Argentina (La Rioja) | G. micropeltis, G. calviformis (116138) | |
Youngest occurrences |
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| Time interval | Ma | Country or state | PBDB collection number |
| Longvillian - Marshbrookian | China (ShanXi) | G. sp. (7918) | |
| Longvillian - Marshbrookian | China (Hunan) | G. sp. (7689) | |
| Actonian - Onnian | China (ZheJiang) | G. sp. (7768) | |
| Actonian - Onnian | China (Hubei) | G. sp. (4690) | |
| Actonian - Onnian | China (AnHui) | G. sp. (7835 7848) | |
| Actonian - Cautleyan | Iran (Gilan) | G. kirgizica (232880) | |
| Eastonian - Onnian | Australia (New South Wales) | G. sp. (2746) | |
| Pusgillian | China (ZheJiang) | G. sp. (7808) | |
| Pusgillian | China (Hubei) | G. sp. (4689) | |
| Ashgill | USA (Maine) | G. sp. (185954) | |