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Tetragraptus

Pterobranchia - Tetragrapta

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 Graptoloidea by Sepkoski (2002); to Tetragrapta by Maletz et al. (2009); and to Dichograptidae by Fortey (2011).

Synonymy list
YearName and author
1863Tetragraptus Salter
2002Tetragraptus Sepkoski, Jr.
2009Tetragraptus Maletz et al.
2011Tetragraptus Fortey p. 223

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
Ambulacraria
phylumHemichordataBateson 1885
classPterobranchiaLankester 1877
RankNameAuthor
classGraptolithina(Bronn 1849)
Graptoloida
Eugraptoloida
Reclinata
superorderPantetragrapta
orderTetragraptaMu 1950
genusTetragraptusSalter 1863

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
ReferenceDiagnosis
J. Maletz et al. 2009The 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).