Allonia

Clausen, Sébastien & Álvaro, J. Javier, 2006, Skeletonized microfossils from the Lower-Middle Cambrian transition of the Cantabrian Mountains, northern Spain, Acta Palaeontologica Polonica 51 (2), pp. 223-238 : 226

Allonia ? cf. simplex (Jiang in Luo et al. 1982)

Fig. 3H, I.

Material.—Ten specimens preserved as phosphatized steinkerns in the Middle Cambrian “Beleño” facies, section Cr 4.

Description.—Two−rayed sclerites (up to 500 µm long, distal part of the rays most probably eroded off) diverging at about a right angle with distinct boundary between the rays.

Remarks.—These specimens are not interpreted as fragments of three− or four−rayed forms because the two rays diverge at a right angle, are straight and lie on the same plane. Although A. pentactina ( Sdzuy, 1969) has a small percentage of 2+0 sclerites, the present sclerites seem to represent Allonnia ? cf. simplex (Jiang in Luo et al. 1982). However, the foramina are indiscernible because of inadequate preservation of the phosphatic steinkerns