Crotalocephalina (Crotalocephalus) gibbus
Trilobites Order Phacopida, Family Cheiruridae
Geological Time: Middle Devonian
Size (25.4 mm= 1 inch): Trilobite is 90 mm long (curve measure) by 32 mm wide on a 70 by 45 mm matrix., Morocco
Fossil Code: 15063
Price: Sold
 Description:
Elegant example of a member of the Order Phacopida, Family Cheiruridae
with many fine details present. The most diagnostic features of
this taxon are the sharp pleural and pygidial spines and the distinctive
cephalon. The describer of this one thought it bore a resemblance
to the head of a rattlesnake (Crotalus), hence the genus name.
The spines may have aided it in staying at the surface of the soft
 seafloor. This one is displayed in a freestanding “flying” pose.
The hypostome which served as the anchor for the mouthparts and
the pygidial doublure are prepared free of matrix, making for an
interesting display piece. The name has changed several times,
from Crotalocephalus to Crotalocephalina, and recently to Cheirurus,
making it hard for the layman to keep up. Whatever you care to
call it, this one will make a fine addition to any collection. |
