Conciliterga

Belongs within: Artiopoda. The Conciliterga are a group of soft-bodied arthropods related to trilobites known from the Lower and Middle Cambrian Burgess Shale and Chengjiang faunas. The concilitergans: sitting next to trilobites Published 20 October 2019 The last few decades have seen a vast increase in our understanding of life during the early Cambrian. Long… Continue reading Conciliterga

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Categorised as Artiopoda

Lejopyge

Belongs within: Agnostina. Lejopyge is a genus of agnostidans known from the Middle and Upper Cambrian of Eurasia (Harrington et al. 1959). Characters (from Harrington et al. 1959): Axial furrows of both shields obsolete except near base of glabella and at upper end of pygidial axis; genae smooth or rugose; surface of pygidium smooth. Lejopyge… Continue reading Lejopyge

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Categorised as Artiopoda

Phacopida

Belongs within: Libristoma.Contains: Calymenidae, Encrinuridae, Sphaerexochinae, Eccoptochilinae, Pilekiinae, Cheirurinae, Phacopidae, Dalmanitidae. The Phacopida are a group of trilobites known from the Ordovician to the Devonian. Most members of this group are distinguished by the possession of proparian facial sutures, with the suture emerging in front of the genal angle. They are divided between the Phacopina,… Continue reading Phacopida

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Categorised as Artiopoda

Olenacea

Belongs within: Libristoma. The Olenacea are a group of trilobites known from the Middle Cambrian to the Upper Ordovician (Harrington et al. 1959). Characters (from Harrington et al. 1959): Exoskeleton subovate to elongate, opisthoparian (exceptionally proparian), micropygous to (rarely)subisopygous, with rounded or spinose genal angles. Cephalon with narrow border, small to medium-sized eyes and in… Continue reading Olenacea

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Categorised as Artiopoda

Pilletopeltis

Belongs within: Cheirurinae. Pilletopeltis is a cosmopolitan genus of trilobites known from the Middle Silurian (Wenlock) to the Middle Devonian (Givetian) (Přibyl et al. 1985). Characters (from Přibyl et al. 1985): Transglabellar furrows 3S and 2S present; median furrows on hypostome relatively shallow; pygidium with long anterior pleural spines and reduced second and third pairs;… Continue reading Pilletopeltis

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Categorised as Artiopoda

Cheirurus

Belongs within: Cheirurinae. Cheirurus is a cosmopolitan genus of trilobites known from the upper Llandovery to Ludlow epochs of the Silurian. Members of this genus have three pairs of pygidial spines and an unpaired medial spine, with the outer pair of spines long and the two inner pairs reduced (Přibyl et al. 1985). <==Cheirurus Beyrich… Continue reading Cheirurus

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Categorised as Artiopoda

Sphaerexochinae

Belongs within: Phacopida.Contains: Acanthoparyphinae, Heliomera, Sphaerexochus. The Sphaerexochinae are a group of trilobites known from the Upper Cambrian to the Upper Silurian. Mature sphaerexochines may have spent much of their time buried in the substrate with the head at the surface (Přibyl et al. 1985) and were possibly ambush predators. Characters (from Přibyl et al.… Continue reading Sphaerexochinae

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Categorised as Artiopoda

Ceraurinella

Belongs within: Cheirurinae. Ceraurinella is a genus of trilobites known from warm waters of the Middle (Llanvirn) to Late (Ashgill) Ordovician. Members of this genus have the ancestral unpaired medial spine of the pygidium fused with the terminal piece of the pygidial and displaced towards the anterior margin of the pygidium. The pygidium bears three… Continue reading Ceraurinella

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Categorised as Artiopoda

Crotalocephalina

Belongs within: Cheirurinae. Crotalocephalina is a cosmopolitan genus of trilobites known from the Wenlock (Middle Silurian) to the Eifelian (Middle Devonian). Members of this genus possess lateral glabellar furrows 2S and 3S running across the sagittal line of the whole glabella (Přibyl et al. 1985). <==Crotalocephalina Přibyl & Vaněk 1964PVP85 |–C. (Crotalocephalina)PVP85 | |–*C. (C.)… Continue reading Crotalocephalina

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Categorised as Artiopoda

Heliomera

Belongs within: Sphaerexochinae. Heliomera is a genus of trilobites known from warm-water palaeozooprovinces of the Ordovician of Eurasia and North America (Přibyl et al. 1985). Characters (from Přibyl et al. 1985): Genae reduced in size; eyes shifted towards external borders of cephalon; genal spines present; pygidium with two axial rings and two pairs of pleurae.… Continue reading Heliomera

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Categorised as Artiopoda