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Scriniocassis klementii
Scriniocassis klementii (Pocock, 1972) Jansonius, 1986
NOW Endoscrinium. Originally Scriniodinium, subsequently Scriniodinium?, thirdly (and now) Endoscrinium, fourthly Scriniocassis. This species was retained in Endoscrinium by Riding and Fensome (2003, p.22).
Holotype: Pocock, 1972, pl.23, figs.1-2; Jan du Chêne et al., 1986, pl.108, figs.5-8
Locus typicus: Imperial Tidewater Wapella, W Canada
Stratum typicum: Callovian
Original description: Pocock, 1972, p.91: Scriniodinium klementii
Vesicle ovoid; wall two-layered; capsule about 0.5 µm thick; smooth to finely granulose; outer wall envelopes capsule and comprises a reticulum with walls about 0.25 µm wide and brocci 0.5 (2.0) 3.5 µm wide, more or less rounded, supporting a very thin microgranulose membrane; outer wall about 1.0 µm thick; epitheca more or less hemispherical, terminated by a projection of the outer wall about 8.0 µm high; hypotheca rounded with an irregular, tending to bilobate, extension of the outer wall, about 5.0 µm long; at the antapex; transverse girdle and longitudinal furrow visible on most specimens; archeopyle simple precingular with free operculum occupying the position of plate 3"; plating, transverse girdle and longitudinal furrow reflected on surface of vesicle by strongly developed crests about 5.0 µm high and up to 2.0 µm wide; crests internally radially striate; tabulation 3", 6", 6""", 1""""; colour yellow; length of vesicle 113.3 (120.0) 132.0 µm; width of vesicle 84.7 (99.0) 105.0 µm; thickness (compressed) 25.0 (27.0) 35.0 µm; length of capsule 90.0 (99.0) 111.0 µm; width of capsule 70.0 (72.6) 87.0 µm; thickness of capsule (compressed) 16.0 (25.0) 27.0 µm.
Supplemental description: Jansonius, 1986, p.218-219
(Holotype) ca 120 x 80 µm overall. Wall two-layered, both layers interconnected by positive sculpture emanating from the inner layer. Inner layer (ca 0.5 µm without sculpture) has a yellow hue and forms a rather regular ellipsoidal body (100 x 72 µm); sculpture consisting of low flat muri (ca 0.5 µm high, 0.5-2 µm wide) forming a reticulum with rounded to elongate brochi ( 1-3 µm); over the plate boundaries these muri are much thinner (0.2-0.5 µm) and taller (5-9 µm), expressing a distinct paratabulation; the tallest muri are found at the apical and antapical polar regions, and the lateral cingular regions. Outer layer is hyaline, very finely pitted, 0.5 µm thick, but up to 1 µm over the plate boundaries; it is stretched rather tautly over and joined with the distal ends of the muri, projecting radially in narrow folds (ca 2 µm wide, 5-9 µm high) that overlie the paraplate boundaries and thus reflect the paratabulation. On the outline these ridges project in a loose manner, giving a lobate appearance to the apical and antapical regions. Because of the nature and internal reticulate structure of the ridges, some of the finest detail of the paratabulation cannot be resolved: the flattened anterior margin of the 3" archeopyle suggests the presence of (an) intercalary plate(s). Also, the junction of 1", 4" and 6" suggests the possibility of an extra plate.
NOW Endoscrinium. Originally Scriniodinium, subsequently Scriniodinium?, thirdly (and now) Endoscrinium, fourthly Scriniocassis. This species was retained in Endoscrinium by Riding and Fensome (2003, p.22).
Holotype: Pocock, 1972, pl.23, figs.1-2; Jan du Chêne et al., 1986, pl.108, figs.5-8
Locus typicus: Imperial Tidewater Wapella, W Canada
Stratum typicum: Callovian
Original description: Pocock, 1972, p.91: Scriniodinium klementii
Vesicle ovoid; wall two-layered; capsule about 0.5 µm thick; smooth to finely granulose; outer wall envelopes capsule and comprises a reticulum with walls about 0.25 µm wide and brocci 0.5 (2.0) 3.5 µm wide, more or less rounded, supporting a very thin microgranulose membrane; outer wall about 1.0 µm thick; epitheca more or less hemispherical, terminated by a projection of the outer wall about 8.0 µm high; hypotheca rounded with an irregular, tending to bilobate, extension of the outer wall, about 5.0 µm long; at the antapex; transverse girdle and longitudinal furrow visible on most specimens; archeopyle simple precingular with free operculum occupying the position of plate 3"; plating, transverse girdle and longitudinal furrow reflected on surface of vesicle by strongly developed crests about 5.0 µm high and up to 2.0 µm wide; crests internally radially striate; tabulation 3", 6", 6""", 1""""; colour yellow; length of vesicle 113.3 (120.0) 132.0 µm; width of vesicle 84.7 (99.0) 105.0 µm; thickness (compressed) 25.0 (27.0) 35.0 µm; length of capsule 90.0 (99.0) 111.0 µm; width of capsule 70.0 (72.6) 87.0 µm; thickness of capsule (compressed) 16.0 (25.0) 27.0 µm.
Supplemental description: Jansonius, 1986, p.218-219
(Holotype) ca 120 x 80 µm overall. Wall two-layered, both layers interconnected by positive sculpture emanating from the inner layer. Inner layer (ca 0.5 µm without sculpture) has a yellow hue and forms a rather regular ellipsoidal body (100 x 72 µm); sculpture consisting of low flat muri (ca 0.5 µm high, 0.5-2 µm wide) forming a reticulum with rounded to elongate brochi ( 1-3 µm); over the plate boundaries these muri are much thinner (0.2-0.5 µm) and taller (5-9 µm), expressing a distinct paratabulation; the tallest muri are found at the apical and antapical polar regions, and the lateral cingular regions. Outer layer is hyaline, very finely pitted, 0.5 µm thick, but up to 1 µm over the plate boundaries; it is stretched rather tautly over and joined with the distal ends of the muri, projecting radially in narrow folds (ca 2 µm wide, 5-9 µm high) that overlie the paraplate boundaries and thus reflect the paratabulation. On the outline these ridges project in a loose manner, giving a lobate appearance to the apical and antapical regions. Because of the nature and internal reticulate structure of the ridges, some of the finest detail of the paratabulation cannot be resolved: the flattened anterior margin of the 3" archeopyle suggests the presence of (an) intercalary plate(s). Also, the junction of 1", 4" and 6" suggests the possibility of an extra plate.