Fig. 6 in A new Late Ordovician bubble-headed trilobite species from South West Wales and its implications for biostratigraphy

Fig. 6. Historic specimens of the encrinurid trilobite Staurocephalus from museum collections. A. SM A31592, cranidium in dorsal view labelled Staurocephalus cf. murchisoni Barrande" from the Sholeshook Limestone Formation (upper Katian, Upper Ordovician) in the Sholeshook railway cutting, Haverfordwest area, herein assigned to S. oliveae sp. nov.? B. BIRUG 48862, cranidium in dorsal view labelled "Staurocephalus cf. murchisoni" from the lower Tre-wylan Beds (Cautleyan) (upper Katian, Upper Ordovician) in the Llansantffraid-ym-Mechain district of the south-eastern Berwyn Hills, Mid Wales (Whittington 1938: 451, locality 42), herein assigned to S. oliveae sp. nov.? C, D. Specimens from the King collection, Sedgwick Museum, from the (locally) basal Ashgill mudstones (lower Rawtheyan, Ashgill Zone 5) (upper Katian, Upper Ordovician) of Aber Marchnant, Berwyn Hills, Mid Wales, originally identified as Staurocephalus cf. murchisoni by King (1923) and assigned to S. clavifrons by Whittington (1968), herein assigned to S. aff. oliveae. C. SM A39813, incomplete cranidium in dorsal view. D. SM A39814.A, incomplete cranidium in dorsal view (D1) and close up of left genal area (D2) to show large lateral denticles (arrowed). E. SM A31589, dorsal view of incomplete cranidium labelled "Staurocephalus globiceps" from the Marr collection, Sedgwick Museum, from the Slade and Redhill Mudstone Formation at Pelcomb Cross, Haverfordwest, herein assigned to S. cf. clavifrons. Note the prominent genal spine on the right side. Scale bars 1 mm, except D2 0.5 mm.