Back
Hystrichostrogylon palliatum
Hystrichostrogylon palliatum Hultberg, 1985
Tax. jr. synonym of Hystrichostrogylon coninckii Heilmann-Clausen in Thomsen and Heilmann-Clausen, 1985, according to Marheinecke, 1992.
Holotype: Hultberg, 1985, pl.7, fig.I
Locus typicus: Limhamn area, S Sweden
Stratum typicum: Late Maastrichtian-Danian
Original description: Hultberg, 1985, p. 131
Cavate cyst, composed of endophragm and periphragm, completely separated. The surface of both endophragm and periphragm is smooth. A large circular hole is allways (sic) present in the middorsal portion of the periphragm. The shape of the cyst is subspherical.
Paratabulation is clealy expressed by gonal processes and parasutural septa. The processes, which are formed by the endophragm, are triangular in shape, trifurcate, and bifid. The periphragm is supported by the processes.
The paratabulation is gonyaulacacean, paratabulation formula: 3", 6"", 6c, 1p, 6""", 1"""".
The archaeopyle is precingular, type P, formed by the detacchment of paraplate 3"". Operculum free.
Paracingulum is inddicated by parasutural septa.
Parasulcus is weakly indicated by parassutural lineations.
Size: 75-78 µm (diameter).
Remarks: Hultberg, 1985, p. 132
This species was invalidly described by Wilson (1974) as Spiniferites palliatus. In fact, this species is very similar to Spiniferites in morphology. The only thing distinguishing this species from S. ramosus is the "periphragm". This outer wall-layer, however, is probably not homologous with the periphragm of other dinocysts, but probably represents an additional layer. however, no separation ofwall-layers can be distinguished in the "endophragm". Taxonomically this species belongs to Hystrichogylon (sic), but it probably represents the cyst of a dinoflagellate that is very closely related to Gonyaulax spinifera, which produces, among others, S. ramosus cysts.
Tax. jr. synonym of Hystrichostrogylon coninckii Heilmann-Clausen in Thomsen and Heilmann-Clausen, 1985, according to Marheinecke, 1992.
Holotype: Hultberg, 1985, pl.7, fig.I
Locus typicus: Limhamn area, S Sweden
Stratum typicum: Late Maastrichtian-Danian
Original description: Hultberg, 1985, p. 131
Cavate cyst, composed of endophragm and periphragm, completely separated. The surface of both endophragm and periphragm is smooth. A large circular hole is allways (sic) present in the middorsal portion of the periphragm. The shape of the cyst is subspherical.
Paratabulation is clealy expressed by gonal processes and parasutural septa. The processes, which are formed by the endophragm, are triangular in shape, trifurcate, and bifid. The periphragm is supported by the processes.
The paratabulation is gonyaulacacean, paratabulation formula: 3", 6"", 6c, 1p, 6""", 1"""".
The archaeopyle is precingular, type P, formed by the detacchment of paraplate 3"". Operculum free.
Paracingulum is inddicated by parasutural septa.
Parasulcus is weakly indicated by parassutural lineations.
Size: 75-78 µm (diameter).
Remarks: Hultberg, 1985, p. 132
This species was invalidly described by Wilson (1974) as Spiniferites palliatus. In fact, this species is very similar to Spiniferites in morphology. The only thing distinguishing this species from S. ramosus is the "periphragm". This outer wall-layer, however, is probably not homologous with the periphragm of other dinocysts, but probably represents an additional layer. however, no separation ofwall-layers can be distinguished in the "endophragm". Taxonomically this species belongs to Hystrichogylon (sic), but it probably represents the cyst of a dinoflagellate that is very closely related to Gonyaulax spinifera, which produces, among others, S. ramosus cysts.