Eoredlichia
intermedia
Trilobites
Order Redlichiida, Family Redlichiidae
Geological
Time: Middle Cambrian
Size (25.4mm=1
inch): 6 mm long and 5 mm across on a 37 mm by 20 mm matrix
Fossil
Site: Chengjiang Maotianshan Shale, Quiongzhusi Section, Yu’anshan
Member, Heilinpu Formation, Mafang, Anning, Kunming, Yunnan Province,
China
Code: CJF607
Price: $95.00
- sold
Description:
This trilobite is a member of the Order Redlichiida, Family Redlichiidae
from the Early Cambrian Heilinpu Formation deposits near Anning,
in Kunming County, Yunnan Province, China, known as Eoredlichia
intermedia. The species is one found in several locations within
Yunnan Province in what is termed the Chegjiang Biota by Hou Xian-guang
in 1984. The diversity of soft-tissue fossils is astonishing: algae,
medusiforms, sponges, priapulids, annelid-like worms, echinoderms,
arthropods (including trilobites), hemichordates, chordates, and
the first agnathan fish make up just a small fraction of the total.
Numerous problematic forms are known as well, some of which may
have represented failed attempts at diversity that did not persist
to the present day.
The
Redlichioids of this type are considered to be the sister-group
comprising all of the “higher” (non-Olenelloid) trilobites
by Richard Fortey. Eoredlichia is thought to have lived on or close
to the seafloor. Based upon its spinose limb bases and braced hypostome,
it is thought by some researchers to have led a predatory existence.
Missing only the axial spine, this is a highly desirable specimen
due to its association with the Chengjiang Biota that made up a
glimpse of the Cambrian Explosion some 5-10 million years before
the Burgess Shale fauna came into being. Diminutive examples such
as this, fully only 10% the size of a large specimen, with such
detail are rarely offered for sale. Notice the sweeping spines that
have been preserved. I have included an artist’s (my daughter’s)
rendition of its appearance in life.
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