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Tetragraptus
Taxonomy
Tetragraptus was named by Salter (1863) [Sepkoski's age data: O Aren-l O Llvi-l Sepkoski's reference number: 1066].
It was assigned to Tetragrapti by Bulman (1970); to Graptoloidea by Sepkoski (2002); to Tetragrapta by Maletz et al. (2009); to Dichograptidae by Fortey (2011); and to Phyllograptidae by Lo Valvo et al. (2020) and Toro et al. (2020).
It was assigned to Tetragrapti by Bulman (1970); to Graptoloidea by Sepkoski (2002); to Tetragrapta by Maletz et al. (2009); to Dichograptidae by Fortey (2011); and to Phyllograptidae by Lo Valvo et al. (2020) and Toro et al. (2020).
Species
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1863 | Tetragraptus Salter |
| 1970 | Tetragraptus Bulman p. V115 |
| 2002 | Tetragraptus Sepkoski |
| 2009 | Tetragraptus Maletz et al. |
| 2011 | Tetragraptus Fortey p. 223 |
| 2020 | Tetragraptus Lo Valvo et al. p. 546 |
| 2020 | Tetragraptus Toro et al. p. 154 |
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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.
G. †Tetragraptus Salter 1863
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†Tetragraptus acclinans Keble 1920
†Tetragraptus akzharensis Tzaj 1968
†Tetragraptus amii Elles and Wood 1902
†Tetragraptus bigsbyi Hall 1865
†Tetragraptus decipiens Hall 1899
†Tetragraptus insuetus Keble and Benson 1929
†Tetragraptus pendens Elles 1898
†Tetragraptus phyllograptoides Strandmark 1902
†Tetragraptus pseudobigsbyi Skevington 1965
†Tetragraptus quadribrachiatus Hall 1858
†Tetragraptus reclinatus Elles and Wood 1902
†Tetragraptus reclinatus reclinatus Elles and Wood 1902
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Maletz et al. 2009 | The crown-clade Tetragrapta is the common
ancestor of Tetragraptus serra and the first species to have distal dicalycal thecae limited to th31 and th32, forming a quadriramous rhabdosome (synapomorphy 6, Fig. 2; see also Fig. 4B). | |
| B. A. Toro et al. 2020 | Phyllograptid with four horizontal to reclined, reflexed and scandent stipes; proximal end isograptid, dextral, with wide crossing canals and tetragraptid proximal end; theca with considerable overlap and moderate development of rutellum. | |
| G. A. Lo Valvo et al. 2020 | Phyllograptid with four horizontal to reclined, reflexed and scandent stipes; proximal end isograptid, dextral, with wide-crossing canals and tetragraptid proximal end; thecae with considerable overlap and moderate development of rutellum. |