Back
Cerodinium
From Williams et al., 2017:
[Cerodinium, Vozzhennikova, 1963, p. 181; Emendation: Lentin and Williams, 1987, p. 114
tax. jr. synonym of Deflandrea Eisenack, 1938, according to Lentin and Williams, 1976, Stover and Evitt, 1978, and Lindgren, 1984. Lentin and Williams, 1987, retained Cerodinium as a separate genus.
Type species: Cerodinium sibiricum, Vozzhennikova, 1963 (text-fig.9)]
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Vozzhennikova, 1963]: (Translation: Lees in Sarjeant (Ed.), 1971, p. 238)
Description:
Theca elongate-oval, with a straight or curved apical horn and two widely separated antapical horns. Size of horns variable. Epitheca somewhat larger than hypotheca. Transverse furrow annulate, equatorial. Longitudinal furrow situated on hypotheca. Width of furrow variable. Internal body spherical, elliptical, surface smooth or granular. Theca pale yellow, its surface smooth or sculptured. Pylome trapeziform.
Affinities:
The genus Cerodinium differs from other genera in the shape of its theca and internal body and in having a curved apical horn.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Emended description:
Lentin and Williams, 1987:
Description:
Pericyst outline typically compressed peridinioid, elongate longitudinally and produced into one apical and two, more or less equal antapical horns. Endocyst spherical to weakly peridinioid. Cavation varies from circumcavate to cornucavate. Ornamentation generally appears to be intratabular.
Periphragm smooth, chagrinate, granulate, denticulate rugulate, verrucate or striate, the ornamentation commonly being aligned longitudinally. Endophragm smooth to granulate.
Archeopyle intercalary; type I/1(2a) or I(2a)/3l(1-3a): periarcheopyle isodeltaform.
Perioperculum linteloid, typically detached; endoperculum detached or adnate. Paratabulation is hexa-style peridiniacean as determined from archeopyle margin. Paracingulum planar or slightly helicoidal, generally indicated by ridges or denticles.
Parasulcus indicated by interruption of paracingulum; mainly developed on hypocyst.
Size usually large.
Affinities:
Cerodinium differs from Deflandrea Eisenack 1938 emend. Lentin & Williams 1976, in having an isodeltaform archeopyle rather than a latideltaform archeopyle. The above emended diagnosis is based in part on the emended diagnosis of Ceratiopsis Vozzhennikova by Bujak et al. (1980, p. 27).
[Cerodinium, Vozzhennikova, 1963, p. 181; Emendation: Lentin and Williams, 1987, p. 114
tax. jr. synonym of Deflandrea Eisenack, 1938, according to Lentin and Williams, 1976, Stover and Evitt, 1978, and Lindgren, 1984. Lentin and Williams, 1987, retained Cerodinium as a separate genus.
Type species: Cerodinium sibiricum, Vozzhennikova, 1963 (text-fig.9)]
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Vozzhennikova, 1963]: (Translation: Lees in Sarjeant (Ed.), 1971, p. 238)
Description:
Theca elongate-oval, with a straight or curved apical horn and two widely separated antapical horns. Size of horns variable. Epitheca somewhat larger than hypotheca. Transverse furrow annulate, equatorial. Longitudinal furrow situated on hypotheca. Width of furrow variable. Internal body spherical, elliptical, surface smooth or granular. Theca pale yellow, its surface smooth or sculptured. Pylome trapeziform.
Affinities:
The genus Cerodinium differs from other genera in the shape of its theca and internal body and in having a curved apical horn.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Emended description:
Lentin and Williams, 1987:
Description:
Pericyst outline typically compressed peridinioid, elongate longitudinally and produced into one apical and two, more or less equal antapical horns. Endocyst spherical to weakly peridinioid. Cavation varies from circumcavate to cornucavate. Ornamentation generally appears to be intratabular.
Periphragm smooth, chagrinate, granulate, denticulate rugulate, verrucate or striate, the ornamentation commonly being aligned longitudinally. Endophragm smooth to granulate.
Archeopyle intercalary; type I/1(2a) or I(2a)/3l(1-3a): periarcheopyle isodeltaform.
Perioperculum linteloid, typically detached; endoperculum detached or adnate. Paratabulation is hexa-style peridiniacean as determined from archeopyle margin. Paracingulum planar or slightly helicoidal, generally indicated by ridges or denticles.
Parasulcus indicated by interruption of paracingulum; mainly developed on hypocyst.
Size usually large.
Affinities:
Cerodinium differs from Deflandrea Eisenack 1938 emend. Lentin & Williams 1976, in having an isodeltaform archeopyle rather than a latideltaform archeopyle. The above emended diagnosis is based in part on the emended diagnosis of Ceratiopsis Vozzhennikova by Bujak et al. (1980, p. 27).