Palpebralia brecciae ( Richter, 1913 )

Feist, Raimund, 2002, Trilobites from the latest Frasnian Kellwasser Crisis in North Africa (Mrirt, central Moroccan Meseta), Acta Palaeontologica Polonica 47 (2), pp. 203-210 : 206

Palpebralia brecciae ( Richter, 1913)

Fig. 2C, D, F, I, J.

Palpebralia brecciae Richter, 1913 ; Feist and Schindler 1994: 208, pl. 2: 1–11 (see list of older synonymies here).

Material.—Figured specimens: 2 cranidia from locality 2 ( UM 2− RF 179, 182), 1 librigenae from locality 2 ( UM 2− RF 180), 1 pygidium from locality 1, upper trilobite association ( UM 2− RF 181); additional material from section “2”, upper trilobite association: 10 cranidia ( UM 2− RF 183–192), 4 librigenae ( UM 2− RF 193–196), 10 pygidia (197–206).

Remarks.—In the present material the anterior branches of the facial suture are slightly more divergent anteriorly than in the type species of P. brecciae from Langenaubach. However, this feature varies within the same population (see Fig. 2C and J). Likewise contemporaneous populations of Palpebralia brecciae from European sections exhibit variations in the degree of divergence of the anterior suture depending on size and preservation ( Feist and Schindler 1994: pl. 2). The middle part of the occipital furrow is slightly curved forward. In these features the new material is identical with the material from Coumiac.