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Pterobranchia - Diplograptoidea - Diplograptidae
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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.
|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.|