Harpes ” neogracilis Richter and Richter, 1924

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

“ Harpes ” neogracilis Richter and Richter, 1924

Fig. 2K–N .

“ Harpes ” neogracilis Richter and Richter, 1924 ; Feist and Schindler 1994: 211, pl. 4: 3–8 (see list of older synonymies therein).

Material.— Figured specimens: 2 cephala from section “2”, upper trilobite association ( UM2 − RF 219–220); additional material from same locality: 13 cephala ( UM2 − RF 221–233); from section “1”, upper trilobite association: 1 cephalon ( UM2 − RF 234), lower trilobite association: 3 cephala ( UM2 − RF 235–237) .

Remarks.—The new material is closest to the specimens from the type locality Sessacker (Rhenish Slate Mountains, Germany, described by Richter and Richter 1926). However, the brim, though flat and down−sloping distally, has perforations of equal size and there is no row of larger perforations on the inner side of the marginal border as in the material from Sessacker. The eyes are less prominent and form low ocular swellings; this feature is also developed in specimens from Coumiac, Montagne Noire ( Feist and Schindler 1994).

Figures

Fig. 2. A, B, E, G, H. Gondwanaspis mrirtensis gen. et sp. nov. from section “2”, upper trilobite association. A, B, G. Holotype, cephalon with damaged right cheek, UM2−RF 170, partially external mould, in dorsal view (A), × 9.2; in frontal view (B) showing frontal and left antero−lateral borders and eye elevation, × 8.3; lateral view (G), × 9.5. E. Cephalon with incomplete left cheek, UM2−RF 171, dorsal view, latex cast of external mould, × 8.1. H. Cephalon with incomplete left cheek, UM2−RF 172, dorsal view, external mould, × 11.1. C, D, F, I, J. Palpebralia brecciae Richter and Richter, 1927. C, F. Cranidium from section “2”, upper trilobite association, UM2−RF 179, external mould, in dorsal view (C), × 10; in lateral view (F), × 9.6. D. Librigena +