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Cymatograptus
Taxonomy
Cymatograptus is a genus. It is not extant. Its type is Didymograptus undulatus.
It was assigned to Dendroidea by Sepkoski (2002); to Dichograptidae by Toro and Maletz (2008); and to Didymograptidae by Lo Valvo et al. (2020).
It was assigned to Dendroidea by Sepkoski (2002); to Dichograptidae by Toro and Maletz (2008); and to Didymograptidae by Lo Valvo et al. (2020).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 2002 | Cymatograptus Sepkoski |
| 2008 | Cymatograptus Toro and Maletz p. 981 |
| 2020 | Cymatograptus Lo Valvo et al. p. 542 |
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| B. A. Toro and J. Maletz 2008 | Subhorizontal, declined to slightly deflexed expansograptids with prosicular
origin of th 1(1) and isograptid or artus type proximal development, either dextral or sinistral; thecae simple or with variably developed prothecal folds; crossing canals often slightly asymmetrical; position of crossing canals relatively high on sicula, producing a deep indention between sicula and th 1(1) and a long, free ventral side of the sicula; isograptid suture lacking. | |
| G. A. Lo Valvo et al. 2020 | Slender, horizontal to subhorizontal or declined tubarium; thecae simple with a
moderate inclination and some species with prothecal folds; sicula relatively long and slender, with small prosicula; supradorsal portion of sicula prominent and with long free ventral side of the aperture; proximal development type isograptid, dextral to artus type, dextral or sinistral; low prosicular origin of th1(1). |