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Hystrichosphaerina varispinosa
Hystrichosphaerina? varispinosa (Brenner, 1988) Stancliffe and Sarjeant, 1990
Originally Systematophora, subsequently (and now) Hystrichosphaerina?. Questionable assignment: Stancliffe and Sarjeant (1990, p.204); and Courtinat in Fauconnier and Masure (2004, p.334) as a problematic species
At the time of the transfer, Stancliffe and Sarjeant, 1990, provisionally included this species in Hystrichosphaerina.
Holotype: Brenner, 1988, pl.16, figs.2a-c
Locus typicus: H÷rnlebruch near Neuffen, Germany
Stratum typicum: Oxfordian-Early Kimmeridgian
Translation Brenner, 1988: LPP
Original diagnosis: Brenner, 1988, p. 87: Systematophora varispinosa
A species of Systematophora with varying shape of processes. From the basal ring-like ridges on the precingular and postcingular paraplates 2""", 3""" and 6""" arises one, widened, smooth or perforate process. Additional single, thin processes may be present. On paraplates 4""" and 5""" some thin processes arise from the basal ring which are connected distally by trabeculae.
Original descripiton: Brenner, 1988, p. 88: Systematophora varispinosa
Systematophora varispinosa differs from other spesies of Systematophora by the extreme variability of the processes and in developing specific process forms for different paraplates of the cysts. The postcingular paraplates 4""" and 5""" consist of numerous, thin processes which are connected distally by ring-trabeculae. These ring-traberculae are usually open towards the paracingulum. Paraplates 1""-6"" and 2""", 3""" and 6""" bear on the part of the basal ring-like ridges opposite the paracingulum a widened, bifid process. The parasulcal plates and the paracingular plates bear one or more thin processes.
Remark and supplemental description: Stancliffe and Sarjeant, 1990, p. 204-205
The morphology of the processes of Hystrichosphaerina varispinosa is very variable within a cluster and from one cluster to another. The processes may have hapto-cluster ring trabeculae, which is a variance with the generic diagnosis of Systematophora Klement 1960 as here emended. Brenner"s diagnosis fails to describe the body shape, archeopyle location or form, full paratabulation formula,
phragma surface features or holotype size; also no paralypes were designated to show the full range of morphological variation. For these reasons the species is only provisionally placed in Hystrichosphaerina Alberti 1961 pending a fuller reconstruction.
The development on the postcingular plales 4""" and 5""" of a gap in the ring trabeculae directed toward the cingulum is of note. This suggests a possible relationship between this species and Systemarophora daveyi Riding and Thomas 1988. The latter species has all its precingular and postcingular processes arranged in arcs open toward the cingulum.
Originally Systematophora, subsequently (and now) Hystrichosphaerina?. Questionable assignment: Stancliffe and Sarjeant (1990, p.204); and Courtinat in Fauconnier and Masure (2004, p.334) as a problematic species
At the time of the transfer, Stancliffe and Sarjeant, 1990, provisionally included this species in Hystrichosphaerina.
Holotype: Brenner, 1988, pl.16, figs.2a-c
Locus typicus: H÷rnlebruch near Neuffen, Germany
Stratum typicum: Oxfordian-Early Kimmeridgian
Translation Brenner, 1988: LPP
Original diagnosis: Brenner, 1988, p. 87: Systematophora varispinosa
A species of Systematophora with varying shape of processes. From the basal ring-like ridges on the precingular and postcingular paraplates 2""", 3""" and 6""" arises one, widened, smooth or perforate process. Additional single, thin processes may be present. On paraplates 4""" and 5""" some thin processes arise from the basal ring which are connected distally by trabeculae.
Original descripiton: Brenner, 1988, p. 88: Systematophora varispinosa
Systematophora varispinosa differs from other spesies of Systematophora by the extreme variability of the processes and in developing specific process forms for different paraplates of the cysts. The postcingular paraplates 4""" and 5""" consist of numerous, thin processes which are connected distally by ring-trabeculae. These ring-traberculae are usually open towards the paracingulum. Paraplates 1""-6"" and 2""", 3""" and 6""" bear on the part of the basal ring-like ridges opposite the paracingulum a widened, bifid process. The parasulcal plates and the paracingular plates bear one or more thin processes.
Remark and supplemental description: Stancliffe and Sarjeant, 1990, p. 204-205
The morphology of the processes of Hystrichosphaerina varispinosa is very variable within a cluster and from one cluster to another. The processes may have hapto-cluster ring trabeculae, which is a variance with the generic diagnosis of Systematophora Klement 1960 as here emended. Brenner"s diagnosis fails to describe the body shape, archeopyle location or form, full paratabulation formula,
phragma surface features or holotype size; also no paralypes were designated to show the full range of morphological variation. For these reasons the species is only provisionally placed in Hystrichosphaerina Alberti 1961 pending a fuller reconstruction.
The development on the postcingular plales 4""" and 5""" of a gap in the ring trabeculae directed toward the cingulum is of note. This suggests a possible relationship between this species and Systemarophora daveyi Riding and Thomas 1988. The latter species has all its precingular and postcingular processes arranged in arcs open toward the cingulum.