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Diplacanthograptus
Taxonomy
Diplacanthograptus was named as a genus. It is not extant.
It was reranked as Climacograptus (Diplacanthograptus) by Mitchell (1987).
It was assigned to Climacograptus by Mitchell (1987); to Graptoloidea by Sepkoski (2002); and to Climacograptinae by Goldman and Wright (2003).
It was reranked as Climacograptus (Diplacanthograptus) by Mitchell (1987).
It was assigned to Climacograptus by Mitchell (1987); to Graptoloidea by Sepkoski (2002); and to Climacograptinae by Goldman and Wright (2003).
Species
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1987 | Climacograptus (Diplacanthograptus) Mitchell pp. 388 - 389 |
| 1989 | Ensigraptus Riva and Ketner p. 89 |
| 2002 | Diplacanthograptus Sepkoski |
| 2003 | Diplacanthograptus Goldman and Wright |
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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.
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†Diplacanthograptus caudatus Lapworth 1876
†Diplacanthograptus dorotheus Riva 1976
†Diplacanthograptus spiniferus Ruedemann 1908
Invalid names: Ensigraptus Riva and Ketner 1989 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. E. Mitchell 1987 | Species of Climacograptus with Pattern E primordial astogeny and a narrow, asymmetrical proximal end with the sicula lying almost entirely to the right of rhabdosome mid-line in obverse view; sicular aperture oriented at about 70° from the rhabdosome axis and bearing a stout (but not necessarily long) virgella deflected across the sicular aperture. Virgella commonly matched by a long mesial spine on thU such that they form a pair which, in an undeformed state, is symmetrical about the rhabdosome axis. More rarely thU bears a small mesial spine as well. | |
| J. F. Riva and K. B. Ketner 1989 (Ensigraptus) | Rhabdosome biserial, largely septate; thecae of the climacograptid type with sharp genicula, deep thecal excavations and horizontal apertures and straight supragenicular wells. Proximal-end development late streptoblasticearly prosoblastic (equivalent to the undulograptid lb proximal construction type of Kearsley 1985, and to pattern D primordial astogeny of Mitchell 1987) with the virgella as the only proximal spine. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Aberhan 1992, Aberhan et al. 2004 | |||||
Age range: Eastonian or 452.30000 to 449.00000 Ma
Collections (14 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Caradoc | Belgium | D. dorotheus (145601 145602) | |
| Caradoc | USA (Nevada) | Climacograptus caudatus (13492) | |
| Late/Upper Ordovician | Canada (Québec) | Climacograptus dorotheus (24603) | |
| Katian | China (Xinjiang) | Climacograptus caudatus (188406 188407 188412) Climacograptus spiniferus, Climacograptus caudatus (188414) | |
| Katian | Vietnam (Bac Kan) | Climacograptus dorotheus (219214) | |
| Eastonian | USA (Idaho) | Climacograptus caudatus (145472 145473 145474 145475) | |
| Ashgill | USA (Idaho) | Climacograptus caudatus (13493) |