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Expansograptus

Pterobranchia - Graptoloidea - Didymograptidae

Taxonomy
Expansograptus was named by Bouček and Přibyl (1953).

It was reranked as Didymograptus (Expansograptus) by Fortey and Owens (1987).

It was assigned to Didymograptus by Fortey and Owens (1987); to Dichograptidae by Vento et al. (2012); to Diplograptidae by Vento et al. (2015); and to Didymograptidae by Lo Valvo et al. (2020).

Synonymy list
YearName and author
1953Expansograptus Bouček and Přibyl
1987Didymograptus (Expansograptus) Fortey and Owens p. 260
2012Expansograptus Vento et al.
2015Expansograptus Vento et al.
2020Expansograptus Lo Valvo et al. pp. 542-543

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Deuterostomia
Ambulacraria
phylumHemichordataBateson 1885
RankNameAuthor
classPterobranchiaLankester 1877
subclassGraptolithina(Bronn 1849)
orderGraptoloideaLapworth 1875
familyDidymograptidaeMu 1950
genusExpansograptusBouček and Přibyl 1953

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. †Expansograptus Bouček and Přibyl 1953
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Expansograptus hirundo Salter 1863
Expansograptus rigoletto Maletz et al. 1991
Diagnosis
ReferenceDiagnosis
G. A. Lo Valvo et al. 2020More or less horizontal didymograptids with isograptid, dextral proximal
development; proximal portion of sicula perpendicular to stipes; sicular and thecal apertures straight, without elaborations; origin of th11 low on prosicula; stipe width variable; crossing canals more or less symmetrically placed on sicula; crossing canal one is initially much wider than crossing canal two; length of isograptid suture variable.