Jan 25
Dudley Trilobite – Bumastus barriensis
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Dudley Trilobite – Bumastus barriensis
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Scenic silurian views
Bumastus, Obsidian Soul, 2011
There is no glamor in eating garbage, no elegance in sifting through the sand for loose particles of decomposed weeds, or flesh rotting inside a nautiloid shell, or an osctracoderm’s curled droppings. Bumastus creeps on the seafloor with its own kind. They’re a near-sighted and nervous species. When the shadow of a eurypterid glides over them, the stout trilobites wriggle backwards into the sand, leaving just their eyes peeking from the speckled grains, watching anxiously for another shadow to sweep past. They’re cowards who would rather roll into a tight ball than fight when attacked. They distrust strange flavors, dislike different species. Neophobic, apprehensive, small-minded, and socially fussy, they just want to be left alone to pick through the sea’s waste and maintain their 60 million-year dynasty of bottom-dwelling.
The Barr trilobite, Bumastus (1839)
Phylum : Arthropoda Class : Trilobita Order : Corynexochida Family : Styginidae Subfamily : Bumastinae Genus : Bumastus Species : B. armatus, B. barriensis, B. beckeri, B. bellmanni, B. bouchardi, B. chicagoensis, B. clairensis, B. cuniculus, B. dayi, B. erastusi, B. globosus, B. graftonensis, B. hornyi, B. indeterminatus, B. insignis, B. ioxus, B. lenzi, B. limbatus, B. lioderma, B. milleri, B. niagarensis, B. orbicaudatus, B. phrix, B. springfieldensis, B. sulcatus, B. tenuirugosus, B. tenuis, B. transversalis, B. trentonensis , B. xestos
Early Ordovician/late Silurian (478 - 418 Ma)
15 cm long (size)
Oceans worldwide (map)
The rounded smooth shape of Bumastus, as well as the almost complete effacement of its cephalon, is believed to have been an adaptation for burrowing. The presence of well-developed eyes also suggest that it may have kept them above the substrate by burrowing into sediments backward. They are situated in such a way that they provide the trilobite with a semicircular field of vision on each side, keeping them aware of movements near them.
Bumastus could also curl up (known as enrollment) into a ball-like shape. This is believed to indicate that its habitat might have been the shallow waters of the Littoral zone. When waves wash them out from the sediments it could simply roll up and be carried along. Enrollment protects the softer body parts below the exoskeleton, while the spherical shape offers the least resistance to wave action.
Bumastus is a bottom-dwelling (nektobenthic) trilobite. It was probably either detritivorous, feeding on decomposing organic material drifting down in the currents,or carnivorous.