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Restoration details: No restoration at all in the specimen. The plate presents one adult specimen of D. ambroggii and, at least, four cranidia of D. ambroggii of small size and two empty spaces of mudballs with almost geometrical conical forms. These mudballs are very common on the green shales of the Tazemmourt Section of the Amouslek Formation. Sometimes they are badly interpreted and confused with fossils.
Dimensions of the specimen: 3,0 x 1,7 cm.
Identification: Daguinaspis ambroggii (Hupé & Abadie, 1950).
Locality: Tazemmourt section, Northen slope of the Western Anti-Atlas, Morocco.
Lithostratigraphy: Upper Amouslek Formation (Lower Cambrian, Stage 3).
Biostratigraphy: Daguinaspis Zone of the Souss Fossil Lagërstatte.
Age: Cambrian, Early Paleozoic Era. 520-515 million years old.
Collection: #CALPAIS 9081; Collected on May 2021.
Description: One complete adult internal mold of D. ambroggii, with 3 cm length. All the exoskeleton show a yellow colour, due to the replacement of the original cuticular substances by argillaceous, phosphatic and ferritic minerals. Note the broad area of the cephalon and thorax covered with dense coarse granulation (very small tubercules). Although not totally exposed, this specimen seems perfect for one expert preparator, as almost all structures are preserved and untouched.
Typical cephalon from one adult individual, heart-shaped, showing several facial sutures of different sizes. The glabella (with all the lobes - L0 to LA - and all the furrows - S1 to S3) and the occipital ring (L0) are a bit eroded but visible. The concave preglabellar frontal area till the eyes is clearly observable. The prominent ocular lobes, so typical from Daguinaspis, are slightly eroded but well marked and elevated from the rest of the cephalon. The right part of the cephalon is under the rock (which should be very easy to remove). Note that there is a sort of hollow layer between almost all the exoskeleton and the rock. That helps to enhance the fossil, as a natural frame. And should help with careful preparation.
Complete thorax, which is rare to find in this species. All segments from 1st to 16th are present. The right lobe is partially covered by the rock that, once again, should be very easy to remove and the fossil should be almost intact. Note the rarely preserved pleural spines, observable from 3rd to 10th left pleurae and very conspicuous. The exoskeleton suffered a slight antero-lateral distortion, very common in these shales (see pictures). This specimen shows evident axial furrows, rarely observable in this species, at least in the anterior tergites. On the left lobe, the overlapping (articulating half-ring) of each pleura to the anterior one is perfectly visible, as the majority of the fulcral and axial processes of the anterior flanges and the fulcral and axial sockets of the posterior flanges. After preparation (optional), all these structures should be, probably, observable also on the right lobe.
The pygidium is partially hidden under the rock. The pygidial axis, after the tergite 16, is observable, inside the hollow layer between the exoskeleton and the rock. The confirmation of the existence of the 16 tergite's pleurae depends on the preparation of the specimen but it is probable. Despite their small size (know from few individuals), Daguinaspis (and other Fallotaspidid) pygidia are surprisingly rare.
Reasons to consider this specimen a very Interesting collector item: complete, big, granulation, flanges, pleural spines, axial furrows, pygidium. Good preparation should turn this specimen into one very delicate unique example of this species. Contact us if you want to do it or want us to try it. On the contrary, it will be sold as-is presented, untouched.
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Consult this and more Souss Lagerstätte specimens here.
Daguinaspis was among the earliest defined genera of Cambrian trilobites that were based on Moroccan material. (...). It has only been found in the Western Anti-Atlas. The occurrences suggest a strong preference for fine-grained sandstones (Geyer, 1996).
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