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Parakidograptus acuminatus
Taxonomy
Diplograptus acuminatus was named by Nicholson (1867).
It was recombined as Cephalograptus acuminatus by Elles and Wood (1908); it was recombined as Akidograptus acuminatus by Churkin and Carter (1970); it was recombined as Orthograptus acuminatus by Hutt (1974); it was recombined as Parakidograptus acuminatus by Koren' and Melchin (2000).
It was recombined as Cephalograptus acuminatus by Elles and Wood (1908); it was recombined as Akidograptus acuminatus by Churkin and Carter (1970); it was recombined as Orthograptus acuminatus by Hutt (1974); it was recombined as Parakidograptus acuminatus by Koren' and Melchin (2000).
Entered
by P. Wagner on 2018-10-19
Synonymy list
| Year | Name and author |
|---|---|
| 1867 | Diplograptus acuminatus Nicholson p. 109 figs. pl. 7, figs. 16, 17 |
| 1908 | Cephalograptus acuminatus Elles and Wood p. 289 figs. pl. 32, fig. a–d, text-fig. 199. |
| 1970 | Akidograptus acuminatus Churkin and Carter |
| 1974 | Orthograptus acuminatus Hutt pp. 37, 38 figs. pl. 7, fig. 9, text-fig. 9, fig. 11, text-fig.10, fig. 4 |
| 2000 | Parakidograptus acuminatus Koren' and Melchin p. 1111 figs. 12.7–12.14, 13.3, 13.7, 13.8 |
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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.
†Parakidograptus acuminatus Nicholson 1867
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| T. N. Koren' and M. J. Melchin 2000 | Rhabdosome septate, up to 9 mm long. Dorso-ventral width increases from 0.7–0.8 mm at first thecal pair to 1.48 mm at fifth. Maximum width 1.68 mm, attained at seventh thecal pair. Thecae have straight, strongly inclined free ventral walls. Apertures distinctly everted, straight or slightly concave. Thecal overlap one-half in distal part. Thecae number 10–12 in 10 mm (2TRD 1.7–2.0 mm). Sicula 0.2–0.22 mm wide at aperture, exposed for 1.16 mm on reverse side. Upward-grown portions of th11 and th12 1.8–2.0 mm long. Theca 11 originates 0.35 mm above sicular aperture, distance between sicular and th11 aperture 2.4 mm. Virgella branches 0.08 mm below sicular aperture and forms umbrella of threads or meshwork structure, with lateral extension approximately 1 mm. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Aberhan et al. 2004, Aberhan 1992 | |||||
Age range: Rhuddanian or 443.10000 to 440.50000 Ma
Collections (16 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Hirnantian - Rhuddanian | Russian Federation (Siberia) | Parakidograptus acuminatus (206171) | |
| Rhuddanian | Serbia | Parakidograptus acuminatus (145653) | |
| Rhuddanian | United Kingdom | Parakidograptus acuminatus (145217) | |
| Rhuddanian | France | Parakidograptus acuminatus (145537 145538 145539) | |
| Rhuddanian | Poland | Parakidograptus acuminatus (211241) | |
| Rhuddanian | United Kingdom (Scotland) | Parakidograptus acuminatus (235554) | |
| Rhuddanian | Uzbekistan | Parakidograptus acuminatus (235718) | |
| Rhuddanian | Belgium | Parakidograptus acuminatus (145604) | |
| Rhuddanian | Morocco | Akidograptus acuminatus (27388) | |
| Llandovery | USA (Alaska) | Akidograptus acuminatus (145584 145585 145591 145596) | |
| Llandovery | China (Hunan) | Parakidograptus acuminatus (27739) |