Cascolus
Temporal range:
The digitally reconstructed holotype of Cascolus
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Genus: Cascolus
Siveter et al, 2017
Species:
C. ravitis
Binomial name
Cascolus ravitis
Siveter et al, 2017

Cascolus is an extinct genus of stem-mandibulate known from the Coalbrookdale Formation.

Description

Cascolus is a long, somewhat vermiform arthropod, roughly 9 millimetres long. It has a head segment containing a head shield, stalked eyes and five pairs of limbs, the first similar to megacheirans and the other four biramous with gnathobases, followed by a nine-segmented thorax and two possibly limbless segments near the posterior. The trunk remains similar in size through tergites 1-4, and then decreases in width onwards into the limbless segments.[1]

Ecology

Cascolus appears to have been a nektobenthic animal, possibly a scavenger.

Etymology

Cascolus was named in honour of Sir David Attenborough. The genus name derives from "castrum" ("stronghold") and "colus" ("dwelling in"), alluding to the Middle or Old English source for the name "Attenborough". The specific name ravitis derives from "Ratae" (the Roman name for Leicester), "vita" ("life") and "commeatis" ("messenger")

Distribution

Cascolus is known from a single specimen from the Silurian Coalbrookdale Formation in England, a diverse Silurian Lagerstatte.

Classification

Cascolus was originally considered as a stem-group phyllocarid.[1] According to phylogenic analysis in Pulsipher et al. (2022), it is considered as stem-mandibulate instead.[2]

Arthropoda

Parioscorpio venator

Cascolus ravitis

Tanazios dokeron

Captopodus poschmanni

Acheronauta stimulapis

Thylacocephala

Occacaris oviformis

Myriapoda

Ercaicunia multinodosa

Clypecaris pteroidea

Waptia fieldensis

Perspicaris dictynna

Canadaspis perfecta

Tokummia katalepsis

Branchiocaris pretiosa

Nereocaris exilis

Odaraia alata

Euthycarcinoidea

Fuxianhuiida

Fuxianhuia

Chengjiangocaris

Shankouia

Pancrustacea

Argulus

Ostracoda

Lepidocaris

Triops

Artemia

Remipedia

Cephalocarida

Hexapoda

Multicrustacea

See also

References

  1. 1 2 Siveter, David J. (22 March 2017). "A new crustacean from the Herefordshire (Silurian) Lagerstätte, UK, and its significance in malacostracan evolution". The Royal Society Publishing. 284 (1851). doi:10.1098/rspb.2017.0279. PMC 5378094. PMID 28330926.
  2. Pulsipher, M. A.; Anderson, E. P.; Wright, L. S.; Kluessendorf, J.; Mikulic, D. G.; Schiffbauer, J. D. (2022). "Description of Acheronauta gen. nov., a possible mandibulate from the Silurian Waukesha Lagerstätte, Wisconsin, USA". Journal of Systematic Palaeontology. 20 (1). 2109216. doi:10.1080/14772019.2022.2109216. S2CID 252839113.
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