Hystrichosphaeridium ramuliferum Deflandre 1937

Now Achomosphaera. Originally Hystrichosphaeridium, subsequently (and now) Achomosphaera, thirdly Spiniferites. See also Baltisphaeridium (combination not validly published).
Tax. sr. synonym of Hystrichosphaeridium rehdense Maier, 1959, according to Sarjeant, 1983.
Holotype: Deflandre, 1937, pl.14 [al. pl.11], fig.5; Fensome et al., 1991, fig.1-p.721, fig.1-p.725
Locus typicus: Paris, France
Stratum typicum: Late Cretaceous
Translation Deflandre, 1937: LPP

Original description: Deflandre 1937, p. 74-75
This species does not possess sutures, however at first sight resembles Hystrichosphaera ramosa. The body is ellipsoidal or more often rhomboidal, and appears to consist of one piece. There are no signs of a subdivision into plates delimited by septa. The appendices on the body are very elegant and mostly strongly branched, and always end in three narrow horns standing normal to the axis of the process bearing them. In some specimens the narrow horns have two
small terminal spinae. The largest appendices appear regularly arranged, in that they are often placed two by two at the ends of an imaginary axis through the body. The wall, yellow or brownish yellow, is clearly less resistant than that of the other species and is often folded and crumpled.
Approximate dimensions: inner body 35-45 µm, with appendices: 90-100 µm.