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Druggidium apicopaucicum
Druggidium apicopaucicum Habib, 1973
Originally (and now) Druggidium, subsequently Raphidodinium.
Habib and Drugg, 1983, presented an updated paratabulation formula for this species but did not effect an emendation.
Below, 1987, transferred this species to Raphidodinium Deflandre, 1936. Lentin and Williams, 1989, retained it in Druggidium.
Holotype: Habib, 1973, pl.1, fig.3, text-fig.3
Locus typicus: DSDP-site 105, Hatteras Abyssal Plain, N Atlantic
Stratum typicum: Berriasian-Barremian
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G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Druggidium apicopaucicum Habib, 1973, has tabulation expressed by crenulate septa or ridges that are smooth or radially striate and or perforate. The crenulated septa are always present on the ventral surface and commonly on the dorsal. Opercular pieces usually adherent on posterior margin. Body smooth to scabrate to microgranulate. Size 31-44 µm.
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Original diagnosis: Habib, 1973, p.51
Small proximate dinoflagellate cysts with shape that for genus. Average C.I. is 21; range from 19 to 25. Average W. L. R. is 0.66; range from 0.64 to 0.70. Tabulation, archeopyle, and operculum as for genus. The tabulation is clearly expressed. Plate boundaries occur as crenulated septa or ridges that are smooth or radially striate and/or perforate. The crenulated septa (Pl. 3, fig. 2) are always present on the ventral tract and commonly on the dorsal. The opercular pieces are adherent at the cingulum in 90 percent of examples. Tract surface is smooth to scabrate, or microgranulate. Forty measured specimens range in maximum diameter from 31 to 44 Ám.
Description: Habib, 1973, p.51
The characteristics of cyst tabulation given for the genus are best expressed in Druggidium apicopaucicum, because of the lack of concealing tract texture. In a few examples, the plate ridges are discontinuous, especially near the sulcus, but can be traced through the alignment of discrete verrucae.
Originally (and now) Druggidium, subsequently Raphidodinium.
Habib and Drugg, 1983, presented an updated paratabulation formula for this species but did not effect an emendation.
Below, 1987, transferred this species to Raphidodinium Deflandre, 1936. Lentin and Williams, 1989, retained it in Druggidium.
Holotype: Habib, 1973, pl.1, fig.3, text-fig.3
Locus typicus: DSDP-site 105, Hatteras Abyssal Plain, N Atlantic
Stratum typicum: Berriasian-Barremian
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Druggidium apicopaucicum Habib, 1973, has tabulation expressed by crenulate septa or ridges that are smooth or radially striate and or perforate. The crenulated septa are always present on the ventral surface and commonly on the dorsal. Opercular pieces usually adherent on posterior margin. Body smooth to scabrate to microgranulate. Size 31-44 µm.
--------------------------------------------------
Original diagnosis: Habib, 1973, p.51
Small proximate dinoflagellate cysts with shape that for genus. Average C.I. is 21; range from 19 to 25. Average W. L. R. is 0.66; range from 0.64 to 0.70. Tabulation, archeopyle, and operculum as for genus. The tabulation is clearly expressed. Plate boundaries occur as crenulated septa or ridges that are smooth or radially striate and/or perforate. The crenulated septa (Pl. 3, fig. 2) are always present on the ventral tract and commonly on the dorsal. The opercular pieces are adherent at the cingulum in 90 percent of examples. Tract surface is smooth to scabrate, or microgranulate. Forty measured specimens range in maximum diameter from 31 to 44 Ám.
Description: Habib, 1973, p.51
The characteristics of cyst tabulation given for the genus are best expressed in Druggidium apicopaucicum, because of the lack of concealing tract texture. In a few examples, the plate ridges are discontinuous, especially near the sulcus, but can be traced through the alignment of discrete verrucae.