Egyngolia

Egyngolia is a genus of very small sized Trilobites, that lived during the Lower Cambrian (Atdabanian to Botomian) in what are today the Russia Federation (Siberian Platform, Dzhagdy Mountains), Mongolia, and South Australia.

Egyngolia
Temporal range: Atdabanian to Botomian
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
Trilobita
Order:
Agnostida
Suborder:
Eodiscina
Superfamily:
Eodiscoidea
Family:
Yukoniidae
Genus:
Egyngolia

Korobov, 1980
species
  • E. obtusa Korobov, 1980 (type)
  • E. willochra Jell, 1990
  • E. zaicevi (Korobov, 1980) synonym Mongolodiscus zaicevi
Synonyms

Mongolodiscus

Etymology

Egyngolia has been named after the Egyngolskaya Suite, the type location of the type species of the genus. obtusa means blunt.

Distribution
  • E. obtusa, Lower Cambrian (Botomian, Egyngolskaya Suite), northwestern Mongolia.
  • E. willochra, South Australia (Lower Botomian)[1]

Description

Like other Agnostida the body of Egyngolia is diminutive, the headshield (or cephalon) and tailshield (or pygidium) are of approximately same size, with 3 thoracic segments in-between. For a member of the Yukoniidae family central raised area of the cephalon or (glabella) is relatively wide. The four furrows crossing the glabella are impressed as deep circular pits isolated or almost isolated from axial furrow (which defines the glabella). The two middle transverse furrows may continue faintly across the glabella. The palpebral lobes are short but prominently raised, and the librigenae tiny. The anterior border usually is a short rim marginal to a long border furrow. The pygidium has a rhachis of six or seven rings and tiny terminal portion, with a small tubercle on each ring, and without a terminal spine. The pleural areas usually with well impressed pleural furrows. The border is narrow and usually carries six pairs of small marginal tubercles.[2]

References
  1. Jago, J.B.; Sun, X.; Zang, W.-L. (2002). Correlation within early Palaeozoic basins of eastern South Australia (PDF). Report book 2002/33. Department of primary industry and resources. Archived from the original (PDF) on 2009-10-13.
  2. Whittington, H. B. et al. Part O, Treatise on Invertebrate Paleontology. Revised, Volume 1 – Trilobita – Introduction, Order Agnostida, Order Redlichiida. 1997


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