Discussion

This little guy has a magnificent total length of 4,63mm ;-)

A small genal spine is recognizable, left sided of the cephalon. The cephalon is sized 2,45mm in width and 1,8mm in length. The significant glabella, sized 1,05mm in length and a maximum width of 0,95mm, is tapering forwards. A preglabellar field is present.

The thorax with a maximum width of 2.45mm has 13 segments. The convex rachis, with intense designed axial rings, passing via deep dorsal furrows into the pleural fields. The pleural lobes are strongly arched.

The pygidium is sized typically very small (micropygous).

The shots I_05..I_07 were done within the microscopic examination and survey of the midget, using a simple CCD camera inside one of the ocular tubes, lighted with halogen light and green filter.

Survey of images

Elrathia kingii (I_01).. (I_04)

General Informations

Locality

Formation

 Millard County, Utah/ USA

 Wheeler Formation

Stratigraphy

 Lower Cambrian

Age

 Order Ptychopariida\ Suborder Ptychopariina\ Superfamily Ptychoparioidea\ Family 

 Alokistocaridae

Discussion

This Trilobite has a total length of 22,4mm.

The width of the cephalon is 17,05mm at a length of 9,25mm (genal spines included). The genal angles are ending in robust blade- like genal spines. The glabella, sized with a maximum width of 3,5mm and 4,15mm in length, is tapering forward. Glabellar furrows are recognizable. A significant preglabellar field is present. Palpebrals are also recognizable. Posterior fringe furrow is present. The free- cheeks are highly developed. The cephalon is margined by a circular fringe. Sutures are strongly ophistiparian. The stures are running divergent, symmetrically converging anterior the preglabellar field.

The thorax has a maximum width of 14,35mm and 13 segments. Prominent pleural furrows. The relatively plain pleural fields presenting well defined dorsal furrows. The axial rings are well developed.

The small and compact pygidium, sized with 3,2mm in length, is restricted by a small fringe.

A well preserved Trilobite, excellently prepped :-)))

Survey of images

Elrathia kingii (I_01).. (I_05)

General Informations

Locality

Formation

 Millard County, Utah/ USA

 Wheeler Formation

Stratigraphy

 Lower Cambrian

Age

 Order Ptychopariida\ Suborder Ptychopariina\ Superfamily Ptychoparioidea\ Family 

 Alokistocaridae

Discussion

An adult specimen together with a juvenile specimen.

The adult Ptychoparriides has a total sagittal length of 19,7mm, the juvenile 5,43mm.

Here the width of the cephalon is 13,45mm at a length of 9,00mm (genal spines included); genal angles are also ending in robust blade- like genal spines; glabella, sized with a maximum width of 3,25mm and 3,50mm in length, is tapering forward; glabellar furrows are recognizable (S0, S1, S2); occipital- ring articulated (L0), basal- and lateral lobes (L1, L2); glabella anterior incised; significant preglabellar field is present; palpebrals are recognizable; posterior fringe furrow is present; free- cheeks are highly developed; cephalon is margined by a circular fringe; sutures are strongly ophistiparian; stures, anterior signigicantly broken open, are running divergent, symmetrically converging anterior the preglabellar field.

The thorax has a maximum width of 12,3mm and 14 segments; prominent pleural furrows; relatively plain pleural fields presenting well defined dorsal furrows; axial rings are well developed.

The small and compact pygidium, sized with 3,0mm in length, is restricted by a small fringe; significant pleural furrows and pleures; significant axial termination.

Dextral damge of anterior cephalon (width- 5,2mm, length- 2,7mm) at juvenile; genal spines more blunt; free- cheeks are highly developed;  significant developed posterior fringe furrow; preglabellar field adumbrated; anterior fringe identifiable.

The thorax has a maximum width of 4,07mm and 13 segments; prominent pleural furrows; relatively plain pleural fields presenting well defined dorsal furrows; axial rings are well developed.

The Pygidium is hardly recognizable.

Like recognizable at image II-01, there's another peripheral juvenile recognizable at the matrix, featuring a handsome total length of 1,1mm.

Several generations of trilobites located at one little matrix :-)))