Offacolus

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Offacolus
Temporal range:
Ma
Reconstruction of Offacolus kingi
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Clade:
Euchelicerata
Family: Offacolidae
Sutton et al., 2002
Genus: Offacolus
Orr et al., 2000
Type species
Offacolus kingi
Orr et al., 2000

Offacolus is an

mineralogist who found the fossils of Offacolus.[1]

Ventral appendages of Offacolus kingi, showing limb-like exopods (Ex2-5)

Similar to Dibasterium, Offacolus possess limb-like exopods (outer limb branches) on appendage II to V,

plesiomorphic (observable in the putative stem-chelicerate taxon Habeliida[4]) and lost within the prosomapod clade.[5]

Classification

Offacolus was originally described as an

Euchelicerata together with the genus Dibasterium and the clade Prosomapoda.[5]

A phylogenetic analysis (the results presented in a cladogram below) conducted by James Lamsdell in 2013 on the relationships within the Xiphosura and the relations to other closely related groups concluded that the Xiphosura, as presently understood, was

sister taxon (closest relative) of Prosomapoda.[5]

Arthropoda

Fuxianhuia

Antennulata

Emeraldella

Trilobitomorpha

Sidneyia

Megacheira
Chelicerata
Pycnogonida
Euchelicerata

Offacolus

Prosomapoda

Weinbergina

Legrandella

Xiphosura

Kasibelinurus

Planaterga

Pasternakevia

Bembicosoma

Dekatriata

Chasmataspidida

Sclerophorata

Arachnida

Eurypterida

References