Trilobite - Olenellus

                              TRILOBITE 

                             

SHAPE & SIZE  OF THE 

BODY CEPHALON  : 

                     Elongated. 

Shape : 

           Semicircular wide with a border. 

Glabella : 

            Extends to the anterior border and has four distinct lateral furrows. 

Facial Suture & Cheeks : 

             Marginal - protoparian, cheeks undivided. 

Eyes : 

         Large, cresentic joined to the front segment of the glabella.

Genal angle : 

Extended in the from of genal spines. 

Name Of The Genus : OLENELLUS 

Bio status 

  1) Phylum    : ARTHROPODA 

  2) Class       :  TRILOBITA 

  3) Order       :  PROTOPARIA 

THORAX : 

                The anterior part of the thorax contains 14segments with spinose pleurae, grooved, third segment larger than the order and with longer spines extended backward.

PYGIDIUM : 

                 Elongated, spine - like, caudal spine without lateral lobes on the axis. 

SPECIAL CHARACTERS : 

                 Head shield semicircular, with a border and genal spine. Facial suture protoparian, crescentic eye ridge connected to the first segment of the glabella, 14 thoracic segments with pleural spines, pygidium without lateral lobes and with a caudal spine.