Back
Scriniocassis priscus
Scriniocassis prisca (Gocht, 1979, p.308,310,312–317; figs.1a–d,2a–b,3a–e,4a–d,5–6,7a–d,8a–b,9a–c,10) Below, 1990, p.31. Emendation: Below, 1990, p.32, as Scriniocassis priscus.
Originally Eyachia, subsequently (and now) Scriniocassis. This combination was not validly published in Below (1987a, p.58) and Prauss (1989, p.29–30), since these authors did not fully reference the basionym.
Holotype: Gocht, 1979, fig. 9a-c
Locus typicus: Well 1001, Dottenhausen near Balingen, S Germany
Stratum typicum: Early Aalenian
Translation Gocht, 1979; Below, 1990: LPP
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Scriniocassis priscus (Gocht, 1979) Below, 1990, emend. Below, 1990. See genus. This species has a pandasutural pattern of narrow, deep lines, sometimes accompanied by thick protruding pandasutural strips (reflected growth zones). There is a small apical horn. Wall two-layered, enclosed space (pericoel) is bridged by numerous radial fibres. The archeopyle is formed from the loss of 3', 2", 3". The operculum is solvate, opercular pieces secate. Tabulation is cop, pop, cap, 4', 5", 0a, 7c, 6"’, 2"”.
--------------------------------------------------
Original description: Gocht 1979, p. 308: Eyachia prisca.
Diagnosis: Central body longer than wide, dorso-ventrally weakly flattened. Epicyst shorter, dome-shaped, provided with a small apical protuberance. Hypocyst larger, polygonal, with strongly expressed angles. Largest width in height of the posterior girdle margin. Girdle offset to the left by its own width. Parasutural pattern consists of narrow, deepened lines, which are partly bordered by pandasutural knot-like ledges (reflected growth zones). The joined apical plates are pentagonal.The apical protuberance (with a small preapical plate?) angles between 1', 2', and 4'. Middorsal plate 3' is larger than the others. Precingular plates rounded to trapezoidal. Girdleplates tetra- to pentagonal. Postcingular plates large, extending from girdle up to the antapex, ca. tetra- to pentagonal. Two almost equidiametrical plates, 1p, (left-ventrally) and 1'''' (right-dorsally) form the antapical region. Sulcus inarticulate, bordered by an arched margin with the pre- and postcingulars. Deepening (flagellar scar) between girdle ends. Formula: 1pr?, 4', 5'', 6c, 6''', 1p, 1''''. Wall bilayered; the intermediate cavity (pericoel) is bridged by numerous radial fibres. Operculum formed either by the loss of the plates 2'' and 3'', or more often (or always) by the loss of single (all?) apical plates (Type 4A+2P after Evitt).
Emended description (annotated): Below, R., 1990, p. 31-32: Scriniocassis priscus
Vesicle/plate arrangement of amphiesma cop, pop, cap, 4', 0a, 5'', 7c, 6''', 2'''', as, subdivided FM, ls, rs, ps; pentagonal 1'''' and hexagonal 2'''' partiform, omegaform ps very large. Growth of thecal plates gonyaulacoidal.
Cyst proximate, polyhedrical with coniform to tholiform epicyst and small horn, and longer, approximately tentoriate hypocyst, the suture between 1'''' and 2'''' in polar position. Equatorial section circular or weakly dorsoventrally flattened, maximum diameter at the posterior cingular margin. Wall: thin pedium, very closely spaced luxuriate columellae, which melt into the tegillum, surface smooth to scabrate, trichocyst pores being reflected as grooves or pores, diffusely distributed or arranged parallel to the plate margins. Plate edges thickened. Paratabulation NR PR/cop, pop, cap, 4', 0a, 5'', 7c, 6''', 2'''', FM subdivided, epicyst rotated counterclockwise with respect to hypocyst. PR undifferentiated or formed by ring-shaped plate pop, on which cop is located as a tubercle or pin, with a horseshoe-like structure that is opened ventrally towards cap, a narrow rectangle.
4 apicals: small, VI 1' (V), VII 2' (DL), isocamerate 3' (DDR), VII 4' (R); 5 precingulars: anteriorly geniculate V-nE 1'' (VL), V-nE 2'' DL), V-nE 4'' (R) and V-nE 5'' (VVR); anteriorly linear IV-nE 3'' (DDR); cingulum weakly helicoidal, levorotatory, flat or lightly indented, divided into lati 1c-6c and steno fastigiate 7c; 6 postcingulars: posteriorly linear VI-nE 1''' (VVL), IV-nE 2''' (LVL), IV-nE 4''' (D), IV-nE 5''' (R) and V-nE 6''' (VR); posteriorly geniculate V-nE 3''' (DL); 2 antapicals partiform: V 1'''' sloping down to VL, VI 2'''' to R; sulcus flat or lightly indented, consisting of: VI as; FM bean-shaped, may be subdivided into AFA (anterior flagellar mark area), rCFA and lCFA (dextral and sinistral central flagellar mark area), rPFA and lPFA (dextral an sinistral posterior flagellar mark area) and narrow xs; small V ls and V rs, ps arrow-shaped, anteriorly narrow, posteriorly widening, and sharp between 1'''' and 2''''; combination archaeopyle 3'+2''+3''; operculum solvate, plates secate, formula 3'(s)+2''(s)+3''(s).
Affinities:
Below, 1990, p.37
Scriniocassis priscus differs from S. weberi in the nature of the pericoel: S. weberi has an intrapericoel reticulum, S. priscus has a denser pericoel filling, consisting of radial fibres.
Originally Eyachia, subsequently (and now) Scriniocassis. This combination was not validly published in Below (1987a, p.58) and Prauss (1989, p.29–30), since these authors did not fully reference the basionym.
Holotype: Gocht, 1979, fig. 9a-c
Locus typicus: Well 1001, Dottenhausen near Balingen, S Germany
Stratum typicum: Early Aalenian
Translation Gocht, 1979; Below, 1990: LPP
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Scriniocassis priscus (Gocht, 1979) Below, 1990, emend. Below, 1990. See genus. This species has a pandasutural pattern of narrow, deep lines, sometimes accompanied by thick protruding pandasutural strips (reflected growth zones). There is a small apical horn. Wall two-layered, enclosed space (pericoel) is bridged by numerous radial fibres. The archeopyle is formed from the loss of 3', 2", 3". The operculum is solvate, opercular pieces secate. Tabulation is cop, pop, cap, 4', 5", 0a, 7c, 6"’, 2"”.
--------------------------------------------------
Original description: Gocht 1979, p. 308: Eyachia prisca.
Diagnosis: Central body longer than wide, dorso-ventrally weakly flattened. Epicyst shorter, dome-shaped, provided with a small apical protuberance. Hypocyst larger, polygonal, with strongly expressed angles. Largest width in height of the posterior girdle margin. Girdle offset to the left by its own width. Parasutural pattern consists of narrow, deepened lines, which are partly bordered by pandasutural knot-like ledges (reflected growth zones). The joined apical plates are pentagonal.The apical protuberance (with a small preapical plate?) angles between 1', 2', and 4'. Middorsal plate 3' is larger than the others. Precingular plates rounded to trapezoidal. Girdleplates tetra- to pentagonal. Postcingular plates large, extending from girdle up to the antapex, ca. tetra- to pentagonal. Two almost equidiametrical plates, 1p, (left-ventrally) and 1'''' (right-dorsally) form the antapical region. Sulcus inarticulate, bordered by an arched margin with the pre- and postcingulars. Deepening (flagellar scar) between girdle ends. Formula: 1pr?, 4', 5'', 6c, 6''', 1p, 1''''. Wall bilayered; the intermediate cavity (pericoel) is bridged by numerous radial fibres. Operculum formed either by the loss of the plates 2'' and 3'', or more often (or always) by the loss of single (all?) apical plates (Type 4A+2P after Evitt).
Emended description (annotated): Below, R., 1990, p. 31-32: Scriniocassis priscus
Vesicle/plate arrangement of amphiesma cop, pop, cap, 4', 0a, 5'', 7c, 6''', 2'''', as, subdivided FM, ls, rs, ps; pentagonal 1'''' and hexagonal 2'''' partiform, omegaform ps very large. Growth of thecal plates gonyaulacoidal.
Cyst proximate, polyhedrical with coniform to tholiform epicyst and small horn, and longer, approximately tentoriate hypocyst, the suture between 1'''' and 2'''' in polar position. Equatorial section circular or weakly dorsoventrally flattened, maximum diameter at the posterior cingular margin. Wall: thin pedium, very closely spaced luxuriate columellae, which melt into the tegillum, surface smooth to scabrate, trichocyst pores being reflected as grooves or pores, diffusely distributed or arranged parallel to the plate margins. Plate edges thickened. Paratabulation NR PR/cop, pop, cap, 4', 0a, 5'', 7c, 6''', 2'''', FM subdivided, epicyst rotated counterclockwise with respect to hypocyst. PR undifferentiated or formed by ring-shaped plate pop, on which cop is located as a tubercle or pin, with a horseshoe-like structure that is opened ventrally towards cap, a narrow rectangle.
4 apicals: small, VI 1' (V), VII 2' (DL), isocamerate 3' (DDR), VII 4' (R); 5 precingulars: anteriorly geniculate V-nE 1'' (VL), V-nE 2'' DL), V-nE 4'' (R) and V-nE 5'' (VVR); anteriorly linear IV-nE 3'' (DDR); cingulum weakly helicoidal, levorotatory, flat or lightly indented, divided into lati 1c-6c and steno fastigiate 7c; 6 postcingulars: posteriorly linear VI-nE 1''' (VVL), IV-nE 2''' (LVL), IV-nE 4''' (D), IV-nE 5''' (R) and V-nE 6''' (VR); posteriorly geniculate V-nE 3''' (DL); 2 antapicals partiform: V 1'''' sloping down to VL, VI 2'''' to R; sulcus flat or lightly indented, consisting of: VI as; FM bean-shaped, may be subdivided into AFA (anterior flagellar mark area), rCFA and lCFA (dextral and sinistral central flagellar mark area), rPFA and lPFA (dextral an sinistral posterior flagellar mark area) and narrow xs; small V ls and V rs, ps arrow-shaped, anteriorly narrow, posteriorly widening, and sharp between 1'''' and 2''''; combination archaeopyle 3'+2''+3''; operculum solvate, plates secate, formula 3'(s)+2''(s)+3''(s).
Affinities:
Below, 1990, p.37
Scriniocassis priscus differs from S. weberi in the nature of the pericoel: S. weberi has an intrapericoel reticulum, S. priscus has a denser pericoel filling, consisting of radial fibres.