1.5" Ordovician Fossils (Duslia? & Carpoids) - Kaid Errami, Morocco

This is a very interesting, Ordovician aged soft-bodied fossil from the Kataoua Formation of Morocco. I believe it's is likely the enigmatic arthropod, Duslia, but all of the specimens I acquired are much more elongated while all the pictured/described specimens I can find of Duslia are much more circular in shape. This may be just a function of the preservation. The orange coloration is natural and due to the oxidization of iron pyrite.

There are also two small carpoid fossils present on the limestone.

Duslia bears many similarities to trilobites, and has sometimes incorrectly been referred to as a soft-bodied trilobite but its exact classification is still up to debate. Currently is is placed in the superclass Arachnomorpha, order Cheloniellida but this is kind of a catch-all bin. It had a segmented body, was blind, and had fine, hook-like protrusions around the edges of its body.



Carpoids are an enigmatic organisms. They are early echinoderms related to starfish and sea urchins. Unlike modern echinoderms, carpoids lack the five fold radial symmetry and water vascular system. Most were asymmetric or bilaterally symmetric. LIke other echinoderms they did possess a skeleton of calcite plates. They consisted of, depending on species, one or two ambulacra (filtering appendages), a theca (“head”) and a three section stele (“tail”). It is believed that they are early ancestors of starfish and other echinoderms but it is also possible that they are an early ancestor of the Chordates. This is phylum that humans are a part of. This is a contentious theory based on the presence or absence of early gills in carpoids. Because these organisms are only known from fossils, gills are hard to identify accurately.

Carpoids evolved during the Middle Cambrian Period and disappear from the fossil record during the early Devonian Period.

Carpoids were an unconventional looking organism. The vital organs of the animal were contained in a theca. Internal organs were surrounded by calcite plates. Depending on the species of carpoid, one or two ambulacrum extended from one end of the theca. These were appendages for filtering water for food. A mouth was located at the base of the ambulacrum if there was just one or between them if there were two. From the other end of the theca, the three section stele (“tail”) extended. This was used either for locomotion or to hold the organism in place if sessile. That is fixed in one location. It is thought that carpoids grew up to about 4 inches (10cm).
FOR SALE
$59
DETAILS
SPECIES
Duslia? & Unidentified Carpoids
LOCATION
Kaid Errami, Morocco
FORMATION
Kataoua Formation
SIZE
Rock 5.2x4.8
ITEM
#80278
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