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Balcoracania dailyi is a small (typically about 1.5 centimetres (0.59 in)),[1] trilobite of the family Emuellidae. Its fossils have been found in South-Australia and Antarctica. It can be recognised by a short field between the front of the axis in the head or glabella and the border ridge, and a semi-circular headsheald, as compared to touching glabella and border, and the sub-pentagonal head, in the sister-genus Emuella. Both emuellid genera share eye ridges that are positioned parallel to the frontal and lateral border of the head, prominent genal spines that are a smooth continuation of the lateral margin of the head, a prothorax of 6 segments, with the 5th and 6th merged and carrying large trailing spines. Both genera have in adulthood a highly variable but large number of segments of the opistothorax, although the largest number found in B. dailyi with 97 is much larger than in Emuella (52). B. dailyi is the only known species in this genus (i.e. the genus is monotypic).[2]

Etymology Edit

The genus name is derived from Balcoracana Creek in the Flinders Ranges, one of the sites where fossils of Balcoracania were collected. The species epithet dailyi is in honor of Dr. B. Daily, of the Geology Department, University of Adelaide.[1]

Ecology Edit

B. dailyi was an inhabitant of protected, shallow, marginal, marine environments. B. dailyi is usually the only trilobite present, but brachiopods are present too. Tubular burrows show it shared its ecosystem with soft-bodied animals.[1]

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