Catalog entries: Amphiplecta satoshii
Original description: Dicyrtid with a long, apically-elongated cephalis (some specimens have a somewhat flattened apex; Pl. 5, figs 10–11) and a short, largely flaring thorax. Shell wall is smooth with randomly arranged, well-spaced, small, circular to elliptical pores. A large number of small thorns connected to one another are present at the apex of the cephalis including one broader thorn connected to spine a (see Pl. 5, fig. 11). Spine V is short, and can protrude at the collar stricture as a very short triangular horn (Pl. 5, fig. 10). In some specimens (such as in Pl. 5, fig. 11 and Pl. 8, fig. 11), apophyses j are strongly expressed and bifurcate, one upward, the other downward just before spine V connects to the wall. Spine a is fused to the dorsal part of the cephalic wall. An arch ad is well developed, thus creating a small shoulder. Spine d seems to bear some dents (Pl. 8, fig. 11) in addition to apophyse c which is thin and connects to the arch near its middle. ax is sometimes seen as a small dent of Mb. Spines ll and lr join Mb close to spines a and d (Pl. 8, fig. 11) and project subhorizontally, almost perpendicularly to the sagittal plan (hence the flaring of the upper thorax). They do not form wings. Arch Vl can be seen in some rare specimens as a thin rod. Although the cephalis and the thorax are separated by arches al and Vl, there are no visible furrows along those arches. Arch al is not distinct but may be embedded in the wall.
Last occurrence (top): within (-Ma, top in "Holocene" stage). Data source:
First occurrence (base): within (-Ma, base in "Holocene" stage). Data source:
Plot of occurrence data:
Amphiplecta satoshii compiled by the radiolaria@mikrotax project team viewed: 17-5-2021
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