Back
Hystrichosphaera buccina
Hystichosphaera buccina Davey and Williams, 1966
Originally Hystrichosphaera, subsequently Spiniferites.
Tax. jr. synonym of Spiniferites pseudofurcatus (Klumpp, 1953) Sarjeant, 1970, according to Lentin and Williams, 1973.
Holotype: Davey and Williams, 1966, pl.4, fig.1, textfig.10
Locus typicus: London Clay, Isle of Wight, England
Stratum typicum: Eocene
Original diagnosis: Davey and Williams, 1966, p. 42-43
A species of Hystrichosphaera with a central body composed ot thick endophragm and thinner periphragm, the latter giving rise to gonal processes and proximal crests. Surface of central body slightly granular or rarely reticulate.
Processes only gonal, simple or branched, and always open distally. Reflected
tabulation is 3-4", 6", 6c, 5""",1"""".
Dimensions: holotype: diameter of central body 58 by 62 Ám, length of processes
up to 32 Ám. Range: diameter of central body 54-68 Ám, length of processes 24-36 Ám.
Original description: Davey and Williams, 1966
The endophragm of the central body is 1.5-2 Ám thick and the periphragm up to 1 Ám. The processes terminate distally in three or more secae, which may be patulate, flaring or recurved. The tips of the secae may be oblate, bifid or bifurcate. This species occurs throughout the London Clay of England.
Affinities:
Davey and Williams, 1966, p. 43: H. buccina is distinguished from all other species of Hystrichosphaera, except H. tertiaria (Eisenack and Gocht), by the characteristic form of the processes. H. buccina differs from H. tertiaria in the tabulation, the latter reflecting 5 precingular and 5 postcingular plates, 4 elongate rhombohedral cingular plates and a fifth triangular cingular plate. In H. buccina 6" is reflected and is triangular, whilst 6c runs along its antapical edge. Often the boundary between 6"" and 6c is ill-defined and may only be seen at high magnification. H. tertiaria has only three apical plates whereas H. buccina may have 3 or 4. When 4 are present I" and 4" are both narrow elongate plates and are in line with the corresponding shortened sulcus. The processes of one of the London Clay specimens are reticulate or occasionally perforate, but their form is different from that of H. perforata.
Originally Hystrichosphaera, subsequently Spiniferites.
Tax. jr. synonym of Spiniferites pseudofurcatus (Klumpp, 1953) Sarjeant, 1970, according to Lentin and Williams, 1973.
Holotype: Davey and Williams, 1966, pl.4, fig.1, textfig.10
Locus typicus: London Clay, Isle of Wight, England
Stratum typicum: Eocene
Original diagnosis: Davey and Williams, 1966, p. 42-43
A species of Hystrichosphaera with a central body composed ot thick endophragm and thinner periphragm, the latter giving rise to gonal processes and proximal crests. Surface of central body slightly granular or rarely reticulate.
Processes only gonal, simple or branched, and always open distally. Reflected
tabulation is 3-4", 6", 6c, 5""",1"""".
Dimensions: holotype: diameter of central body 58 by 62 Ám, length of processes
up to 32 Ám. Range: diameter of central body 54-68 Ám, length of processes 24-36 Ám.
Original description: Davey and Williams, 1966
The endophragm of the central body is 1.5-2 Ám thick and the periphragm up to 1 Ám. The processes terminate distally in three or more secae, which may be patulate, flaring or recurved. The tips of the secae may be oblate, bifid or bifurcate. This species occurs throughout the London Clay of England.
Affinities:
Davey and Williams, 1966, p. 43: H. buccina is distinguished from all other species of Hystrichosphaera, except H. tertiaria (Eisenack and Gocht), by the characteristic form of the processes. H. buccina differs from H. tertiaria in the tabulation, the latter reflecting 5 precingular and 5 postcingular plates, 4 elongate rhombohedral cingular plates and a fifth triangular cingular plate. In H. buccina 6" is reflected and is triangular, whilst 6c runs along its antapical edge. Often the boundary between 6"" and 6c is ill-defined and may only be seen at high magnification. H. tertiaria has only three apical plates whereas H. buccina may have 3 or 4. When 4 are present I" and 4" are both narrow elongate plates and are in line with the corresponding shortened sulcus. The processes of one of the London Clay specimens are reticulate or occasionally perforate, but their form is different from that of H. perforata.