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The two small carabids of this genus in Otago and Southland are very similar in form and colour. However, N. procerula
is widespread and found in many lowland remnant forest sites whereas N. edax
is rare and known only from a single subalpine site. A third, a new species, is also in a lowland site and a fourth, a further new species, is also rare and known from a single alpine locality. To the west in Fiordland lie Neoferonia prolixa
and Neoferonia straneoi
which is thought to be a species with two names (synonyms).
Text updated: 6/09/2013