Back
Histiophora
From Fensome et al., 2019:
Histiophora, Klement, 1960, p.51.
Type: Klement, 1960, pl.6, figs.11–13, as Histiophora ornata.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Klement, 1960]: (Translation: Stover and Evitt, 1978, p. 53):
Description:
Ellipsoidal shell with four trapezoidal isolated fields disposed around [above and below] a girdle area on the dorsal side of the epi- and hypovalve. Fields enclosed by wide, distally finely toothed, hyaline fringes. Ventrally without closed fields, but with a few low ridges running in longitudinal and transverse directions. Apex region splits off like a skullcap and forms the pylome. Antapex with a trapezoidal field, enclosed by a toothed fringe, analogous to the boundary of the dorsal fields.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Modified description:
Stover and Evitt, 1978, p. 53:
Synopsis:
Cysts proximochorate, body elongate ellipsoidal; paratabulation probably gonyaulacacean, indicated by low to high, complete or nearly complete penitabular septa; archeopyle apical, probably Type tA.
Description:
Shape: Elongate ellipsoidal.
Wall relationships: Autophragm only.
Wall features: No parasutural features. Penitabular septa complete or nearly complete, outline rounded to polygonal areas; septa denticulate distally, higher on the dorsal surface than on the ventral surface, and may be absent on midventral surface. Autophragm between septa smooth or faintly ornamented.
Paratabulation: Indicated by penitabular features, probably gonyaulacacean; formula unknown.
Archeopyle: Apical, probably Type tA; principal archeopyle suture slightly zigzag; operculum free.
Paracingulum: Position indicated by absence of penitabular septa.
Parasulcus: Apparently not indicated.
Size: Intermediate.
Affinities:
Histiophora differs from Amphorula in having complete or nearly complete penitabular septa and an elongate ellipsoidal body, and in lacking septa within the paracingulum. In Amphorula, septa on the precingular and postcingular areas are normally incomplete, and rectilinear septa occur within the paracingulum.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Notes:
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Histiophora Klement, 1960. From Stover and Evitt (1978), Cysts proximochorate, body elongate ellipsoidal; paratabulation probably gonyaulacacean, indicated by low to high, complete or nearly complete penitabular septa; archeopyle apical, probably tA.
Histiophora, Klement, 1960, p.51.
Type: Klement, 1960, pl.6, figs.11–13, as Histiophora ornata.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Klement, 1960]: (Translation: Stover and Evitt, 1978, p. 53):
Description:
Ellipsoidal shell with four trapezoidal isolated fields disposed around [above and below] a girdle area on the dorsal side of the epi- and hypovalve. Fields enclosed by wide, distally finely toothed, hyaline fringes. Ventrally without closed fields, but with a few low ridges running in longitudinal and transverse directions. Apex region splits off like a skullcap and forms the pylome. Antapex with a trapezoidal field, enclosed by a toothed fringe, analogous to the boundary of the dorsal fields.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Modified description:
Stover and Evitt, 1978, p. 53:
Synopsis:
Cysts proximochorate, body elongate ellipsoidal; paratabulation probably gonyaulacacean, indicated by low to high, complete or nearly complete penitabular septa; archeopyle apical, probably Type tA.
Description:
Shape: Elongate ellipsoidal.
Wall relationships: Autophragm only.
Wall features: No parasutural features. Penitabular septa complete or nearly complete, outline rounded to polygonal areas; septa denticulate distally, higher on the dorsal surface than on the ventral surface, and may be absent on midventral surface. Autophragm between septa smooth or faintly ornamented.
Paratabulation: Indicated by penitabular features, probably gonyaulacacean; formula unknown.
Archeopyle: Apical, probably Type tA; principal archeopyle suture slightly zigzag; operculum free.
Paracingulum: Position indicated by absence of penitabular septa.
Parasulcus: Apparently not indicated.
Size: Intermediate.
Affinities:
Histiophora differs from Amphorula in having complete or nearly complete penitabular septa and an elongate ellipsoidal body, and in lacking septa within the paracingulum. In Amphorula, septa on the precingular and postcingular areas are normally incomplete, and rectilinear septa occur within the paracingulum.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Notes:
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Histiophora Klement, 1960. From Stover and Evitt (1978), Cysts proximochorate, body elongate ellipsoidal; paratabulation probably gonyaulacacean, indicated by low to high, complete or nearly complete penitabular septa; archeopyle apical, probably tA.