Acanthodesmia vinculata

Super Group: 
Acanthodesmia v
Müller, 1857
Acanthodesmia viniculata (Mueller) Mueller, 1858
Giraffospyris angulata (Haeckel) Goll, 1969


Majority of tests with a noncoplanar, horizontal basal (collar) ring arising from the lower corners of the asymmetrical D-shaped sagittal ring and a kidney-shaped frontal ring (meridional), lying in the lateral plane of the test and comprising two hemi-cardioid rings, each of which arises from the midpoint of the superior bar and extends laterally, curving downward to join with each half of the basal ring at its lateral extremities. Bars of the sagittal ring three-bladed in section except for a short cylindrical median bar which occupies the dorsal one-fifth to one-third of the lower bar of the ring. Thin, conical, primary lateral spines of variable length, in a few specimens joining with the basal ring to form collar pores; a short, thorn-like axial spine present; dorsal spine thin, conical, of variable length, absent in a few specimens; secondary lateral spines possibly represented by the dorsal bars of the basal ring. Apical bar of ring straight, with or without short lateral spines; a thin, conical apical spine extends from and is collinear with it, of variable length, absent in a few specimens. Vertical bar angulated, its proximal portion nearly horizontal; vertical spine arises from its distal portion above the lower ventral corner of the D-ring and is represented by a short blade-like thorn or thin spine. Several, 4 to 6 or more, nodes of paired lateral spines located along the sagittal ring, three pairs of which extend as the bars of the basal and frontal rings, the other nodes represented by thin, conical, laterally extending spines. Bars of the frontal and basal rings circular in section, with numerous thin, conical by-spines of variable length (1-75 µm) and number, more or less regularly disposed, 8-12 on the basal ring, 5-15 or more on the frontal ring. Frontal ring shows the greatest variation of the structures comprising this species. In a few specimens the two halves of the frontal ring do not arise from the same point on the sagittal ring. In several specimens one or both halves of the ring are forked before joining with the basal or sagittal rings or both. 

Observation site(s)


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Gymnoxanthella radiolaria Okinawa Island Site 990528

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