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Didymograptellus protobifidus
Taxonomy
Didymograptus protobifidus was named by Elles (1933).
It was recombined as Didymograptellus protobifidus by Chen et al. (2016).
It was recombined as Didymograptellus protobifidus by Chen et al. (2016).
Synonymy list
| Year | Name and author |
|---|---|
| 1933 | Didymograptus protobifidus Elles p. 98 figs. 1-4 |
| 1977 | Didymograptus protobifidus Carter and Churkin p. 15 figs. Plate 1, figures 5, 8 |
| 2016 | Didymograptellus protobifidus Chen et al. p. 102 |
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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.
†Didymograptellus protobifidus Elles 1933
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. Carter and M. Churkin 1977 | According to the original description, the pendant stipes of this species are 10-20 mm long, narrow proximally, and widen to 1.3 mm distally. The stipes diverge at angles of about 20°-25° or are subparallel. Thecae number 13 per centimeter and they overlap one-half and are inclined at a low but variable angle to the stipe axis. |
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 Chewtonian to the top of the Blackhillsian or 473.10000 to 471.30000 Ma
Collections (13 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Ibexian | USA (California) | Didymograptus protobifidus (205357 205358) | |
| Floian | Canada (Newfoundland) | Didymograptus protobifidus (198244) | |
| Floian | Russian Federation (Siberia) | Didymograptus protobifidus (205381 205382) | |
| Arenig | Bolivia (Ayopaya) | Didymograptus protobifidus (8842) | |
| Blackhillsian | USA (California) | Didymograptus protobifidus (77106 104272 196119 196121 196123 196125) | |
| Chewtonian - Castlemainian | USA (Idaho) | Didymograptus protobifidus (145223) |