. Bulletin of the British Museum (Natural History), Geology. 258 DINOFLAGELLATE CYSTS. Fig. ii. Cyclonephelium laciniiforme Gerlach 1961. The apical archaeopyle is indicated by shading. (8) ; W40. Cyclonephelium ordinatum Williams & Downie 1966c PI. 7, %• 8 1966c Cyclonephelium ordinatum Williams & Downie : 225 ; pi. 25, fig. 3 ; text-fig. 62. Dimensions. Observed range : cyst body 50 x 52 \i. to 68 x 75 /x ; length of processes up to 30 p. (n = 9). Remarks. The processes are similar to those of several members of the Areoligera senonensis complex (A. coronata, A. cf. coronata,
. Bulletin of the British Museum (Natural History), Geology. 258 DINOFLAGELLATE CYSTS. Fig. ii. Cyclonephelium laciniiforme Gerlach 1961. The apical archaeopyle is indicated by shading. (8) ; W40. Cyclonephelium ordinatum Williams & Downie 1966c PI. 7, %• 8 1966c Cyclonephelium ordinatum Williams & Downie : 225 ; pi. 25, fig. 3 ; text-fig. 62. Dimensions. Observed range : cyst body 50 x 52 \i. to 68 x 75 /x ; length of processes up to 30 p. (n = 9). Remarks. The processes are similar to those of several members of the Areoligera senonensis complex (A. coronata, A. cf. coronata, A. medusettiformis and A. cf. medusettiformis). It also resembles Areoligera in having its processes organized into process complexes ; however, only linear and occasionally arcuate complexes are developed, and the processes are restricted to the peripheral zone of the cyst body. Occurrence. Lower and Middle Eocene. Previous Records. Palaeocene of northern Spain (Caro 1973) ; Lower Eocene of north Germany (Gocht 1969), of northern Spain (Caro 1973) and of the Hampshire and London Basins in southern England (Williams & Downie 1966c, Downie, Husain & Williams 1971*) ; Middle Eocene of northern France (Gruas-Cavagnetto 1971*) and north Germany (Gocht 1969) ; Middle Oligocene of north Germany (Benedek 1972, doubtful attribution). Cyclonephelium pastielsi Deflandre & Cookson 1955 1948 Membranilarnax cf. liradiscoides O. Wetzel; Pastiels : 47 ; pi. 5, fig. 15. I955 Cyclonephelium pastielsi Deflandre & Cookson : 285 (nom. nud.).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
Size: 1591px × 1571px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorbritishmuseumnaturalhistory, bookcentury1900, bookcoll
