Harman Patil (Editor)

Hebediscidae

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Covid-19
Kingdom  Animalia
Class  Trilobita
Suborder  Eodiscina
Rank  Family
Phylum  Arthropoda
Order  Agnostida
Superfamily  Eodiscoidea
Similar  Eodiscina, Agnostina, Agnostidae, Delgadella

The Hebediscidae are a family of trilobites belonging to the order Agnostida that lived during the Lower Cambrian (Atdabanian to Toyonian). They are small or very small, and have a thorax of two or three segments. The Hebediscidae include five genera (see box).

Contents

Taxonomy

The Hebediscidae probably descended from the Tsunydiscidae and gave rise to the Weymouthiidae.

Description

Like all Agnostida, the Hebediscidae are diminutive and the headshield (or cephalon) and tailshield (or pygidium) are of approximately the same size (or isopygous) and outline. In the Hebediscidae, the central raised area of the cephalon (or glabella) is wide at its rear end, has parallel sides or tapers forward, and without transverse glabellar furrows, although the lobes may be apparent if they are expanded. A three segment thorax is known in Hebediscus, Delgadella and Tchernyshevioides. The pygidium has a wide, tapering axis of more than four segments.

References

Hebediscidae Wikipedia


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