Morphological analysis of Mesozoic‐Cenozoic<i>Cribroperidinium</i>(Dinophyceae), and taxonomic implications.

Helenes, Javier

doi:10.1080/01916122.1984.9989273

Cited by 51 publications

(33 citation statements)

References 13 publications

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“…The Taylor/ Evitt system, in contrast to the more familiar Kofoid system, labels paraplates inferred to be homologous with the same label, regardless of the number of paraplates in the series. More complete discussion of Taylor/Evitt notation can be found in Evitt (1985), Lucas-Clark (1984), and Helenes (1984Helenes ( , 1986 J. Lucas-Clark: Aptiana-Ventriosum Complex of Fossil Dinophyceae 157 THE APTIANA-VENTRIOSUM COMPLEX The group of gonyaulacoid dinoflagellate cysts referred to as the Aptiana-Ventriosum complex displays the following details of paratabulation:…”

Section: Methodsmentioning

confidence: 98%

“…Aldorfia can be distinguished from Apteodinium on the basis of paratabulation differences, and in a general way on the basis of overall cyst shape. Helenes (1984Helenes ( , 1986 has noted the paratabulation differences, and they are further discussed below. Species which are currently assigned to Apteodinium vary from having nearly smooth, singlelayered walls, to having thick spongy/cavernous/ columnar layers and/or ectophragms.…”

Section: Presence Position and Character Of Pericoelsmentioning

confidence: 95%

“…Helenes (1984Helenes ( , 1986 indicated and illustrated that Aldorfia aldorfensis has a Q paraplate, and has more quadrate X and Z paraplates than are typical of Cribroperidinium. Also, the shape of Y is less asymmetrical in A. aldorfensis than in Cribroperidinium.…”

Section: Precise Paratabulationmentioning

confidence: 97%

“…A large subgroup of genera of fossil gonyaulacoid dinoflagellate cysts has been noted in the literature (Helenes, 1984(Helenes, , 1986Damassa, 1984) as having certain details of paratabulation that set them apart from other fossil gonyaulacoids. Helenes referred to the group that he reported on as the "Cribroperidinium complex" (1984) and later as the "AptianaVentriosum complex" (1986), while Damassa (1984) called hers the "Danea group."…”

Section: Introductionmentioning

confidence: 97%

“…Future studies of details of paratabulation in the gonyaulacoids will probably provide the basis of a suprageneric classification of cysts based primarily (Helenes, 1984(Helenes, , 1986 Danea Group (Damassa, 1984) Additional Genera (This paper) 1. To describe and illustrate the new genus Wigginsiella and the two species assigned to it.…”

Section: Introductionmentioning

confidence: 99%

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Wigginsiellan. gen.,spongodinium, andApteodiniumas members of theaptianaventriosumcomplex (fossil dinophyceae)

Lucas‐Clark¹

1987

Palynology

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To cite this article: Joyce Lucas-Clark (1987) Wigginsiella n. gen., spongodinium, and Apteodinium as members of the aptianaventriosum complex (fossil dinophyceae), Palynology, 11:1, 155-184, AbstractWell-preserved representatives of three genera of fossil gonyaulacoid dinoflagellate cysts, Wigginsiella n. gen., Spongodinium Deflandre 1935, and Apteodinium Eisenack 1958, show paratabulation details that indicate a close relationship to genera referred to the "Aptiana-Ventriosum complex" of Helenes (1986) and the "Danea group" of Damassa (1984). Important details of paratabulation include: (1) asymmetrical, oblong, antapical paraplate (Y), (2) elongate posterior intercalary (X), (3) crescentic posterior sulcal (Z), (4) pentagonal-hexagonal last precingular (li) which contacts both first and fourth apicals (lu and A), (5) offset of alignment of the parasutures of the dorsal precingular and dorsal postcingular paraplates (offset of IV/V and 4/5), and (6) contact of the second and fourth apicals (B and A) precluding contact of P with the third apical (C). Expression of paratabulation in species of these three genera is typically subtle and unclear in many specimens, thus other criteria, such as wall structure and ornamentation, are especially important for generic and specific identification, while paratabulation is more critical to an understanding of relationships between genera.

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Section: Methodsmentioning

confidence: 98%

Section: Presence Position and Character Of Pericoelsmentioning

confidence: 95%

Section: Precise Paratabulationmentioning

confidence: 97%