Nimchacystis agterbosi and Pauxillites thaddei

Nimchacystis (dand nimcha, a curved Moroccan sword, in reference to the shape of the dististele, and the suffix - cystis from ancient Greek meaning "bag".).

Nimchacystis belongs to the Solute, an extinct class of primitive echinoderms, which lived from the Middle Cambrian to the Early Devonian. The class is also known by its junior synonym Homoiostelea. Soluta is one of the four "carpoid" classes, along with Ctenocystoidea, Cincta and Stylophora, which made up the obsolete subphylum Homalozoa.

The Soluta have a flattened teak strongly asymmetrical composed of small plates. Its exclusive characteristic is the presence of two appendages arranged one at each end of the teak:

• classroomcophore (tail type).
•  The other is exclusive to homoiosteles; is short and it is located in the anterior part, and has a groove on its underside interpreted as a food structure. They presented benthic life feeding of organic particles from the marine sediment, capturing them with its feeding appendage.

Pauxillites It was a hyolith. The hyoliths They are a kind of small animals lophophoratedconical-shaped shell that lived in the Paleozoic era. Its fossils are found from the beginning of the Cambrian to the end of the Permian, although they are not very abundant from the Ordovician onwards. For a long time they were considered mollusks or similar to them.

The calcareous shells are conical, triangular or semicircular in section and usually flattened in the ventral area. They had a cover or operculum, usually articulated. Hyolithids also had two curved rods, known as hellenes, which are interpreted as support structures to raise the shell above the substrate. The shells could be ornamented with longitudinal folds or present growth lines.

It has been observed that they had an extendable lophophore with tentacles, used as a feeding organ, and a long U-shaped stomach.

The taxonomic position of hyoliths has always been uncertain, until in 2017 their inclusion in Lophophorata was determined, a group that includes brachiopods, phoronids and bryozoans thanks to the study of specimens that preserve impressions of soft tissues and the lophophore was studied. The lophophore (from lophos, crest and phoreus, bearer) is a crown or horseshoe-shaped structure provided with numerous cilia that surround the mouth. The vibration of the cilia causes a current of water that attracts particles suspended in the water towards the tentacles, where they are retained and taken to the mouth. This type of feeding is known as suspension feeding.

The Fezouata deposits, near the Moroccan city of Zagora, are providing a rich sample of a fauna similar, although later in time, to the famous Burgess Shale (Canada). We are talking about fossils between 480 and 472 million years old. The age indicates that the Burgess Shale type communities were not restricted, as was believed, to the early stages of the Cambrian and then suddenly disappeared, but rather they survived much longer, coexisted with the later fauna and would be the normal type of deep sea fauna throughout the planet. So Morocco was an ocean and was over the South Pole.