Redlichiina

Redlichiina
The trilobite Redlichia chinensis from the suborder Redlichiina
Temporal occurrence
Lower to Middle Cambrian
Locations
worldwide
Systematics
without rank: Protostomia Over trunk : Molting animals (Ecdysozoa) Trunk : Arthropod (arthropoda) Class : Trilobites (Trilobita) Order : Redlichiida Subordination : Redlichiina
Scientific name
Redlichiina
Harrington , 1959

The Redlichiina are next to the Olenellina one of the two suborders of the trilobite order Redlichiida . They are made up of the three superfamilies Emuelloidea , Paradoxidoidea and Redlichoidea .

description

(Morphological terms are explained in more detail in the Trilobites article )

Cephalon (head shield): The facial sutures (facial sutures) are ophistoparous. Early forms usually have conically tapering glabels, the furrows of which extend far back. In late forms, the glabella expands forward to form a bulging frontal lobe. The hypostome is either conterminant (as in Redlichia ) or natant (as in Dolerolenus ). The rostral plate is narrower than in the suborder Olenellina and is bordered by rostral and weld lines.

Thorax (breastplate): Characteristic are the many segments (more than 60 in an emuellid). Spines can occasionally attach to the spindle.

Pygidium (tail shield): Usually very small, but in some species it can be larger and include several segments.

phylogenesis

The Redlichiina appear for the first time in the Lower Cambrian and are therefore very old trilobites. They died out again at the end of the Middle Cambrian - but may have developed into the Ptychopariida order beforehand .

Systematics

• Superfamily Emuelloidea
  • Emuellidae
  • Megapharanspidae
• Superfamily Paradoxidoidea
  • Centropleuridae
  • ( Hicksiidae )?
  • ( Lermontoviidae )?
  • Paradoxididae
  • Xystriduridae
• Superfamily Redlichioidea
  • Abadiellidae
  • Chengkouaspidae - including Bathynotidae
  • Dolerolenidae
  • Gigantopygidae
  • Kuechowiidae
  • Mayiellidae
  • Menneraspididae
  • Metadoxididae
  • Neoredlichiidae - as the Neoredlichiinae subfamily of the Redlichiidae
  • Redlichiidae
  • Saukiandidae
  • Yinitidae
  • Yunnanocephalidae - are mostly placed among the Ptychopariida

The systematic position of the Bathynotidae has not yet been clarified, but due to the similarities of their upper armor, they are usually placed with the Chengkouaspidae.

Photo gallery

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  Balcoracania dailyi - Emuellide

• 

  Emuella polymera - Emuellide

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  Paradoxides davidis - Paradoxidide

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  Redlichia takooensis - Redlichiide

Web links

Commons : Redlichiina  - collection of images, videos and audio files

• Sam Gon III: order Redlichiida with subordination Redlichiina
• Classification of the trilobites
• Order Redlichiida with some representatives of the Redlichiina

swell

• Benton, MJ (1993). The Fossil Record 2. Chapman & Hall