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Expansograptus hirundo
Taxonomy
Didymograptus hirundo was named by Salter (1863) [Lectotype designated by Fortey & Owens 1987]. Its type specimen is BGS GSM6803. and is a 3D body fossil.
It was recombined as Didymograptus (Expansograptus) hirundo by Fortey and Owens (1987); it was recombined as Expansograptus hirundo by Tsai (1974) and Maletz (2005).
It was recombined as Didymograptus (Expansograptus) hirundo by Fortey and Owens (1987); it was recombined as Expansograptus hirundo by Tsai (1974) and Maletz (2005).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1863 | Didymograptus hirundo Salter p. 137 fig. 13f |
| 1974 | Expansograptus hirundo Tsai pp. 76-77 figs. pl. 6, figs 10-14. |
| 1987 | Didymograptus (Expansograptus) hirundo Fortey and Owens pp. 260 - 264 figs. 115, 116, 117,120c |
| 2005 | Expansograptus hirundo Maletz figs. Text-fig. 3D, H |
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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.
†Expansograptus hirundo Salter 1863
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. A. Fortey and R. M. Owens 1987 | Didymograptus (Expansograptus) reaching large size, stipes slightly reclined. Initial thecal growth rapid, stipe width increasing quickly from 1-5 mm over first five thecae, but stipes continue to widen gradually distally to at least th 70, and a maximum width of 3.3-3.6 mm. Thecal apertures thus describe a distinct arch beneath the sicula. Thecal spacing of 11-12 thecae in 10 mm distally (th 10-th 15 repeat distance about 4-5 mm). Thecae curved, distal inclination 50°-60° to dorsal wall, thecal apertures strongly flared, cutting back to about a quarter of stipe width distally. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Aberhan et al. 2004, Aberhan 1992 | |||||
Age range: base of the Dapingian to the top of the Darriwilian or 470.00000 to 458.40000 Ma
Collections (5 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Hunneberg - Volkhov | Russian Federation (Moscow oblast) | Didymograptus hirundo (235824) | |
| Dapingian | Russian Federation (Siberia) | Expansograptus hirundo (205380 206146) | |
| Darriwilian | Russian Federation (Siberia) | Expansograptus hirundo (205379 206145) |