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Expansograptus
Taxonomy
Expansograptus was named by Bouček and Přibyl (1953).
It was reranked as Didymograptus (Expansograptus) by Fortey and Owens (1987).
It was assigned to Didymograptus by Fortey and Owens (1987); to Dichograptidae by Vento et al. (2012); to Diplograptidae by Vento et al. (2015); and to Didymograptidae by Lo Valvo et al. (2020).
It was reranked as Didymograptus (Expansograptus) by Fortey and Owens (1987).
It was assigned to Didymograptus by Fortey and Owens (1987); to Dichograptidae by Vento et al. (2012); to Diplograptidae by Vento et al. (2015); and to Didymograptidae by Lo Valvo et al. (2020).
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1953 | Expansograptus Bouček and Přibyl |
| 1987 | Didymograptus (Expansograptus) Fortey and Owens p. 260 |
| 2012 | Expansograptus Vento et al. |
| 2015 | Expansograptus Vento et al. |
| 2020 | Expansograptus Lo Valvo et al. pp. 542-543 |
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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. †Expansograptus Bouček and Přibyl 1953
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†Didymograptus (Expansograptus) validus Törnquist 1901
†Expansograptus abnormis Hsu 1934
†Expansograptus hirundo Salter 1863
†Expansograptus rigoletto Maletz et al. 1991
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Lo Valvo et al. 2020 | More or less horizontal didymograptids with isograptid, dextral proximal
development; proximal portion of sicula perpendicular to stipes; sicular and thecal apertures straight, without elaborations; origin of th11 low on prosicula; stipe width variable; crossing canals more or less symmetrically placed on sicula; crossing canal one is initially much wider than crossing canal two; length of isograptid suture variable. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Aberhan 1992, Aberhan et al. 2004 | |||||
Age range: base of the Floian to the top of the Early/Lower Llanvirn or 477.10000 to 461.10000 Ma
Collections (36 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Hunneberg - Volkhov | Russian Federation (Moscow oblast) | Didymograptus hirundo (235824) | |
| Floian | Argentina (Jujuy) | Cymatograptus rigoletto (220287) | |
| Floian | Argentina (Catamarca) | Didymograptus sp. (145599 145600) | |
| Floian | Russian Federation (Siberia) | E. extensus, E. suecicus, E. sp. (206143) E. extensus, E. taimyrensis, E. suecicus, E. sp. (205381 205382) E. suecicus (205565) | |
| Floian | China (Hubei) | E. suecicus (203695) | |
| Floian - Dapingian | Russian Federation (Siberia) | E. suecicus, E. sp. (206142) | |
| Arenig | Canada (Yukon) | Didymograptus aequalis (204021 204026) Didymograptus validus (203982 203997 204000 204014) | |
| Arenigian | Argentina (Jujuy) | Cymatograptus rigoletto (220304 220317) E. suecicus (220318) | |
| Dapingian | Russian Federation (Siberia) | E. extensus, E. taimyrensis, E. suecicus, E. hirundo (205380) E. sp., E. taimyrensis, E. extensus (205563) E. suecicus, E. extensus (206147) E. suecicus, E. extensus, E. sp. (205387) E. suecicus, E. extensus, E. sp., E. taimyrensis, E. hirundo (206146) | |
| Darriwilian | Russian Federation (Siberia) | E. balhaschensis (206165) E. extensus, E. sp., E. balhaschensis (206166) E. suecicus, E. hirundo (205379) E. taimyrensis, E. sp., E. hirundo (206145) | |
| Darriwilian | Kazakhstan | E. sp. (275753) | |
| Darriwilian | Australia (New South Wales) | E. sp. (219786) | |
| Darriwilian | Russian Federation (Gorny Altai) | E. balhaschensis (194974) E. extensus, E. sp. (194973) | |
| Early/Lower Llanvirn | Chile | E. sp. (8861) | |
| Oretanian | Spain (Salamanca) | E. sp. (198819) | |
| Oretanian | Spain (Guadalajara) | E. sp. (20914) | |
| Oretanian | Spain (Toledo) | E. sp. (20898) |