The genus of this trilobite was described in the last century by H. J. Harrington. Having also described the genus type in Argentina thus placing evidence forward once again of the break up and joining of continents through out the Palaeozoic and Mesozoic periods. The carapace is well placed on the original bedding plane, the shale of the fossil layer, which is from Fezouta shale north of Zagora. A small town in the Draa River valley, The Drâa-Tafilalet region of south eastern Morocco. From Zagora signs proclaim it is 52 days to Timbouctou.
The Asaphellus trilobite is in excellent condition displaying the attributes of the type. The cephalon and pygidium evenly sized, the cephalon only slightly larger. The segments of the thorax are clearly defined and the eyes raise quite prominently. Parts of other ordovician trilobites also feature on the plate. No repairs to this specimen, it is quite naturally exhibiting in the split shale plate.
The process of excavating these types in the Fezouta shales is one of simply splitting the shale. A strong blow to the limestone can reveal, if very fortunate a complete specimen like this. The process often takes place after the hard work of climbing over the mountain range skirting the Sahara western desert, in search of outcrops of fossil bearing rock. When the rock has been excavated the work begins splitting, this can be attempted many times before a good specimen is produced.