An adittional asaphid trilobite with preserved appendages from the Fezouata Biota (Lower Ordovician of Morocco)
DOI:
https://doi.org/10.55407/geogaceta99641Keywords:
Fossil-Lagerstätten, Fezouata Biota, Tremadocian, trilobite appendagesAbstract
A third specimen of Megistaspis (Ekeraspis) cf. hammondi is described from the most important Ordovician Burgess Shale-type Fossil-Lagerstätte in Morocco. The trilobite specimens with soft-part preservation are located in late Tremadocian levels within the Fezouata Formation, but are very rare. The studied specimen preserves the right antenna, and nine appendages under the right side of the exoskeleton, only evident when a break in the rock released part of the exoskeleton and revealed the underlying biramous appendages. These mostly consist of endopods, but also at least a couple of exopods, recognizable by their long lamellae. The first endopod seems to correspond to the distal tip of the third cephalic appendage, while the rest are thoracic appendages. The features of the preserved antenna indicate that most such appendages in other specimens from the same area are created or enhanced during preparation. Besides the studied asaphid, soft-part preservation of digestive tract and appendages are known from four coeval species, totalling about fifty published specimens. But it is quite possible that, like in the present specimen, biramous appendages may be preserved under the carapace of other specimens with antennae.
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