Assessment Rationale:

Calathus extensicollis was endemic to Pico (Azores, Portugal). It has a very small extent of occurrence (EOO = 0-16 km²) and area of occupancy (AOO = 0-16 km²).The last record dates from 1859. Exhaustive surveys in known and/or expected habitat, at appropriate times (diurnal, seasonal, annual), throughout its historic range have failed to record an individual (Borges et al. 2016). The species is considered Extinct.

Geographic Range:

Calathus extensicollis was a single island endemic species restricted to Pico (Azores, Portugal) (Borges et al. 2010), known from high elevation native forest (900-1000 m). This large bodied species is considered extinct (Terzopoulou et al. 2015). No precise location was indicated in the original description, but at the indicated elevation there are the current main remnants of native forest.

Population:

The species is only known from a single subpopulation. A continuing decline in the number of mature individuals is inferred from historical records. According to Terzopoulou et al.(2015) this species is extinct.

Habitat and Ecology

The species occurred in the native forest of the Pico Island (Azores). It was a night activity predator that lived in the high elevation native forest with an altitudinal range between 900 and 1000 m. This species is considered extinct (Terzopoulou et al. 2015).

Major Threat(s):

In the past, the species has probably strongly declined due to changes in habitat size and quality and its large body size (Terzopoulou et al. 2015).

Conservation Actions

The species is not protected by regional law. Its habitat is in a regionally protected area (Natural Park of Pico). Further research is needed into its ecology and life history in order to find extant specimens and obtain information on population size, distribution and trends.