From time to time we would like to present an exceptional trilobite which, for one reason or another, managed to catch our attention.
Everyone, every visitor to this website and every collector may suggest a trilobite from his or her collection.
It does not necessarily has to be an extremly rare or spectacular specimen."Normal" trilobites stand an equal chance of climbing our virtual place of honour. The only condition is that you are the owner of
the specimen and hold all the rights to it or authorized to act on his or her behalf. So please do not send any pictures taken from other websites
without permission or of trilobites which are not yours unless you and its legal owner act under consent. Suggestions can be sent to the webmaster and should include both pictures (at least 1024 x 768 pixels) and a short description as well as details like taxonomy, stratigraphy as far as available.
Every email will be answered! We would be glad to present your beauty!!
(Translation from the German version supported by Andries Weug)
Our present favourite:
Asaphellus sp. (Asaphida, Asaphidae)
"Beni Zouli", west of Jbel Bani, Southern Morocco (Arenig, Lower Ordovician)
Collection: Andries Weug
I´m very glad to present to you this exceptional trilobite.
Besides the real beauty of this Asaphellus sp. it is also a juvenile trilobite.
Juvenile is a synonym for childhood phase. How do you recognize a baby trilobite?
First of all you have to know that the growth phase of a trilobite is split in: protaspid, meraspid and holaspid stages. A protaspis is the first phase and represents at the same time the smallest known form of trilobites. It´s called baby or larval stage.
A protaspid larva has no thoracic segments and is between 0,25 and 1 mm in size.
After the first molt(s) a thoracic segment will appear.
This is a new growth phase and is called meraspid (comparable with youth phase).
As soon as the normal number of thoracic segments is reached, the trilobite is called holaspid (adult).
The size doesn´t matters only the complete number of thoracic segments is what counts. The Asaphellus sp. shown here is an extraordinary good stone impression and one thoracic segment is easily recognizable.
So this meraspid shows the first meraspid growth phase. Although you can find in Morocco several places with juvenile trilobite parts, complete specimens are very hard to find and extremely rare.
There are countless reasons for that. The size, bad contrast between stone and shell, thin shell and a lot more.
Which is why I´m so glad to be able to present you this superb Asaphellus sp. © 2009 Image and text: Andries Weug, Mörfelden (ed. M. Kipping)
You would like to suggest an exceptional trilobite from your collection?
Please send a picture with details to Mike!
Any previous "Featured Trilobite" and "Trilobite of the Month" (until Nov. 2008) is available here!
Last Update :
01/30/2010 5:07 PM