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Kisselovia tenuivirgula ssp. crassiramosa
Kisselovia tenuivirgula ssp. crassiramosa (Williams and Downie, 1966) Lentin and Williams, 1976
Now Charlesdowniea crassiramosa. Originally Wetzeliella tenuivirgula var. crassiramosa, subsequently Wetzeliella tenuivirgula ssp. crassiramosa, thirdly Kisselovia tenuivirgula ssp. crassiramosa, fourthly Kisselovia crassiramosa, fifthly (and now) Charlesdowniea crassiramosa.
The taxon was raised to subspecies status by Lentin and Williams, 1973.
Holotype: Williams and Downie, 1966, pl.19, fig.7
Locus typicus: Whitecliff, England
Stratum typicum: Early Eocene
Original description: Williams and Downie, 1966, p. 189: Wetzeliella (Wetzeliella) tenuivirgula ssp. crassoramosa
This differs from the typical W. tenuivirgula in the nature of the distal branching of the processes; the secae and trabeculae are much wider and taeniate, the reticulum being much stronger as a result. The processes forming the simulate complexes are often united by particularly wide taeniate secae (or bars) up to 3Á in width. Frequently there are simple unconnected spines with blunt or bulbous terminations branching off from the bars and trabeculae. In outline, the outer shell lies between that of W. articulata and W. symmetrica, individuals with an outline approaching the latter species predominating.
Holotype: outer shell length 125 Ám; breadth 122 Ám. Capsule--length 80 Ám; breadth 71 Ám. Observed range: outer shell length 125-182 Ám; breadth 122-160 Ám; Capsule, length 80-144 Ám; breadth 71-103 Ám.
Now Charlesdowniea crassiramosa. Originally Wetzeliella tenuivirgula var. crassiramosa, subsequently Wetzeliella tenuivirgula ssp. crassiramosa, thirdly Kisselovia tenuivirgula ssp. crassiramosa, fourthly Kisselovia crassiramosa, fifthly (and now) Charlesdowniea crassiramosa.
The taxon was raised to subspecies status by Lentin and Williams, 1973.
Holotype: Williams and Downie, 1966, pl.19, fig.7
Locus typicus: Whitecliff, England
Stratum typicum: Early Eocene
Original description: Williams and Downie, 1966, p. 189: Wetzeliella (Wetzeliella) tenuivirgula ssp. crassoramosa
This differs from the typical W. tenuivirgula in the nature of the distal branching of the processes; the secae and trabeculae are much wider and taeniate, the reticulum being much stronger as a result. The processes forming the simulate complexes are often united by particularly wide taeniate secae (or bars) up to 3Á in width. Frequently there are simple unconnected spines with blunt or bulbous terminations branching off from the bars and trabeculae. In outline, the outer shell lies between that of W. articulata and W. symmetrica, individuals with an outline approaching the latter species predominating.
Holotype: outer shell length 125 Ám; breadth 122 Ám. Capsule--length 80 Ám; breadth 71 Ám. Observed range: outer shell length 125-182 Ám; breadth 122-160 Ám; Capsule, length 80-144 Ám; breadth 71-103 Ám.