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Pseudoplegmatograptus

Pterobranchia - Bireclinata - Retiolitidae

Taxonomy
Pseudoplegmatograptus is a genus. It is not extant.

It was assigned to Retiolitinae by Lenz and Melchin (1987); and to Graptoloidea by Sepkoski (2002).

Species lacking formal opinion data

View classification of included taxa

Synonymy list
YearName and author
1987Pseudoplegmatograptus Lenz and Melchin p. 162
2002Pseudoplegmatograptus Sepkoski, Jr.

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
Ambulacraria
phylumHemichordataBateson 1885
classPterobranchiaLankester 1877
classGraptolithina(Bronn 1849)
Graptoloida
Eugraptoloida
RankNameAuthor
Reclinata
superorderPanbireclinata
orderBireclinata
infraorderAxonophora(Frech 1897)
infraorderNeograptinaStorch et al. 2011
superfamilyRetiolitoideaLapworth 1873
familyRetiolitidaeLapworth 1873
subfamilyRetiolitinaeLapworth 1873
genusPseudoplegmatograptus

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
A. C. Lenz and M. J. Melchin 1987Prosicula well developed. Virgella distally forming 4-pronged ancora which develops into basket-shaped corona formed of 2-3 crude rows of cells. Lateral bar from near apex of sicula splits into 2 parietal lists to form theca l1. Virgula moves quickly to ventral side of rhabdosome, alternately giving off short branches to 'left' and 'right'. Branch divides into short ventral and long dorsal, branch to form aboral list; these in turn divide and project laterally to form parietal lists. Zig-zag line on dorsal side alternately joins 'left' and 'right' thecal lists. Thecae orthograptid in profile, bases marked by a single median thread joining centre of thecal lip and aboral list of previous theca. Thecal spines developed near margin of thecal lips, projecting proximally and laterally (pi. 1, fig. 1). Lacinia not seen. Reticulum of very irregular meshwork; meshes vary considerably in size and shape. Large irregular openings (stomata) present along medial line. Rhabdosome ovate in cross-section. Fine structure of lists comprises longitudinal striations only.