Back
Hystrichokolpoma sp. 1 of heilmann-clausen 1989
Hystrichokolpoma sp. 1 of Heilmann-Clausen in Heilmann-Clausen and Costa 1989
------------------------------------------------------------------------------------------------------------------------------------------------
Genus: Hystrichokolpoma Klumpp, 1953; emend. Williams and Downie, 1966
Type species: Hystrichokolpoma cinctum Klumpp, 19533
Translation Klumpp, 1953: Stover and Evitt, 1978, p. 54
Original description: Klumpp 1953. p. 388
Diagnosis: The shell is almost round, divided by a girdle-like zone into two separate halves. The lower consists of six plates with inflated processes, between which in the middle there is an opening. The upper part carries four humped plates adjacent to the girdle and one field with thin spines as on girdle. A smaller plate with a hollow process, longer than the bags [i.e., bag-like inflated processes], forms the apical field.
Emended diagnosis: Williams and Downie, 1966, p. 176
Chorate cyst bearing two types of intratabular processes, large types with expanded bases, and slender ones. Large processes have proximally a quaddrate cross section reflecting plate outline. Slender processes delimiting well markedd cingular and sulcal zone. Cingulum helocoid. reflected tabulation of 4", 6"", 6g, 5""", 1p, 1"""". Archaeopyle tetratabular.
Stover and Evitt 1978, p. 54
Synopsis: Cysts skolochorate, gonyaulacacean; body subspherical with hollow, distally open, intratabular processes of two shapes; those in
paracingular and parasulcal areas typically much narrower than others; archeopyle apical, Type tA.
Modified description:
Shape: Body subspherical.
Wall relationships: Endophragm and periphragm appressed between processes.
Wall features: Parasutural areas are narrow strips between expanded process bases and may be expressed additionally by low parasutural ridges or periphragmal thickenings on some forms. Intratabular processes of two different shapes. Most processes more or less cylindrical to vasiform; may have significantly expanded bases (penitabular) and constricted distal ends. Paracingular and most parasulcal processes narrower than others; periphragm, including processes, smooth, faintly striate, or scabrate. Profiles of processes differ considerably among species, but fairly constant within a species.
Paratabulation: Expressed by separate processes or by small groups of processes having a common base; gonyaulacacean, process formula: 4", 6"", 6-12c, 5-6""", 1p, 1"""", 2-5s.
Archeopyle: Apical, Type tA; outline of principal archeopyle suture often nearly smooth.
Paracingulum: Each paraplate indicated by single or multiple processes. The latter have a common base and are normally slender, tapered, expanded slightly distally, and much narrower than those on other parts of the cyst. Parasulcus: Indicated by two to five isolated intratabular processes; anterior
and posterior processes larger than other parasulcal processes.
Size: Intermediate to large.
Affinities:
Stover and Evitt 1978, p. 54-55: Hystrichokolpoma differs from Florentinia in having an apical archeopyle rather than a precingular or combination Type tA+P archeopyle. It differs from Hystrichosphaeridium in possessing processes of two different shapes rather than of a single shape. Achilleodinium, which has processes like those on Hystrichokolpoma, has a precingular archeopyle rather than an apical archeopyle.
------------------------------------------------------------------------------------------------------------------------------------------------
Genus: Hystrichokolpoma Klumpp, 1953; emend. Williams and Downie, 1966
Type species: Hystrichokolpoma cinctum Klumpp, 19533
Translation Klumpp, 1953: Stover and Evitt, 1978, p. 54
Original description: Klumpp 1953. p. 388
Diagnosis: The shell is almost round, divided by a girdle-like zone into two separate halves. The lower consists of six plates with inflated processes, between which in the middle there is an opening. The upper part carries four humped plates adjacent to the girdle and one field with thin spines as on girdle. A smaller plate with a hollow process, longer than the bags [i.e., bag-like inflated processes], forms the apical field.
Emended diagnosis: Williams and Downie, 1966, p. 176
Chorate cyst bearing two types of intratabular processes, large types with expanded bases, and slender ones. Large processes have proximally a quaddrate cross section reflecting plate outline. Slender processes delimiting well markedd cingular and sulcal zone. Cingulum helocoid. reflected tabulation of 4", 6"", 6g, 5""", 1p, 1"""". Archaeopyle tetratabular.
Stover and Evitt 1978, p. 54
Synopsis: Cysts skolochorate, gonyaulacacean; body subspherical with hollow, distally open, intratabular processes of two shapes; those in
paracingular and parasulcal areas typically much narrower than others; archeopyle apical, Type tA.
Modified description:
Shape: Body subspherical.
Wall relationships: Endophragm and periphragm appressed between processes.
Wall features: Parasutural areas are narrow strips between expanded process bases and may be expressed additionally by low parasutural ridges or periphragmal thickenings on some forms. Intratabular processes of two different shapes. Most processes more or less cylindrical to vasiform; may have significantly expanded bases (penitabular) and constricted distal ends. Paracingular and most parasulcal processes narrower than others; periphragm, including processes, smooth, faintly striate, or scabrate. Profiles of processes differ considerably among species, but fairly constant within a species.
Paratabulation: Expressed by separate processes or by small groups of processes having a common base; gonyaulacacean, process formula: 4", 6"", 6-12c, 5-6""", 1p, 1"""", 2-5s.
Archeopyle: Apical, Type tA; outline of principal archeopyle suture often nearly smooth.
Paracingulum: Each paraplate indicated by single or multiple processes. The latter have a common base and are normally slender, tapered, expanded slightly distally, and much narrower than those on other parts of the cyst. Parasulcus: Indicated by two to five isolated intratabular processes; anterior
and posterior processes larger than other parasulcal processes.
Size: Intermediate to large.
Affinities:
Stover and Evitt 1978, p. 54-55: Hystrichokolpoma differs from Florentinia in having an apical archeopyle rather than a precingular or combination Type tA+P archeopyle. It differs from Hystrichosphaeridium in possessing processes of two different shapes rather than of a single shape. Achilleodinium, which has processes like those on Hystrichokolpoma, has a precingular archeopyle rather than an apical archeopyle.