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Ellipsodinium reticulatum
Ellipsodinium reticulatum Duxbury, 1980
Holotype: Duxbury, 1980, pl.4, figs. 4, 8
Locus typicus: Speeton Clay, Speeton, England
Stratum typicum: Barremian
Original diagnosis: Duxbury 1980, p.117-118
A small ellipsoidal to ovoidal dinoflagellate cyst. The surface is ornamented with a crude, fairly fine reticulum which is of equal height over the whole body except in the paracingulum, where it is absent. This reticulum may be largely degenerate and in places may be broken down into small coni. The archeopyle is single paraplate precingular, mid-dorsal in position.
Observed Dimensions: Holotype 46x38 Ám. Overall 46(41)35x44(35)27 Ám.
Affinities:
Duxbury, 1980, p. 118: Ellipsodinium rugulosum Clarke & Verdier 1967, the type species of the genus, is characterised by having low crests outlining a reticulum which is elongated parallel to the long axis of the body. The crests of E. rugulosum become lower toward the poles. E. reticulatum n. sp., on the other band, bears a fairly fine, crude reticulum with no preferred elongation and no variation in the crest height. Further, the reticulum of E. reticulatum may be degenerate and so consist of isolated sections of crest punctuated by gaps or of such sections associated with small coni.
Holotype: Duxbury, 1980, pl.4, figs. 4, 8
Locus typicus: Speeton Clay, Speeton, England
Stratum typicum: Barremian
Original diagnosis: Duxbury 1980, p.117-118
A small ellipsoidal to ovoidal dinoflagellate cyst. The surface is ornamented with a crude, fairly fine reticulum which is of equal height over the whole body except in the paracingulum, where it is absent. This reticulum may be largely degenerate and in places may be broken down into small coni. The archeopyle is single paraplate precingular, mid-dorsal in position.
Observed Dimensions: Holotype 46x38 Ám. Overall 46(41)35x44(35)27 Ám.
Affinities:
Duxbury, 1980, p. 118: Ellipsodinium rugulosum Clarke & Verdier 1967, the type species of the genus, is characterised by having low crests outlining a reticulum which is elongated parallel to the long axis of the body. The crests of E. rugulosum become lower toward the poles. E. reticulatum n. sp., on the other band, bears a fairly fine, crude reticulum with no preferred elongation and no variation in the crest height. Further, the reticulum of E. reticulatum may be degenerate and so consist of isolated sections of crest punctuated by gaps or of such sections associated with small coni.