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Pterobranchia - Diplograptoidea - Diplograptidae

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).

Synonymy list
YearName and author
1987Climacograptus (Diplacanthograptus) Mitchell pp. 388 - 389
1989Ensigraptus Riva and Ketner p. 89
2002Diplacanthograptus Sepkoski, Jr.
2003Diplacanthograptus Goldman and Wright

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phylumHemichordataBateson 1885
classPterobranchiaLankester 1877
classGraptolithina(Bronn 1849)
subfamilyClimacograptinae(Frech 1807)

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.

C. E. Mitchell 1987Species 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.