Calosoma (Castrida) linelli Mutchler, 1925

Calosoma galapageium Linell, 1898: 250
Calosoma linelli Mutchler, 1925: 222 (type: Chatam island; US National Museum of Natural History, Washington)
Calosoma (Microcalosoma) linelli Breuning, 1928: 123
Blaptosoma (Microcalosoma) linelli Lapouge, 1932: 394
Castrida (Microcalosoma) linelli Jeannel, 1940: 99
Calosoma (Microcalosoma) linelli Gidaspow, 1963: 284
Castrida linelli Basilewsky, 1968: 204

Length 12-13 mm. C. linelli seems to represent the most morphologically differentiated taxon among the species typical of the environment of the high ground terminal to the islands Galapagos, and the most clearly genetically separated one. It has wings completely atrophied, it is small, depigmented, with no seta on the pronotum.
It is endemic of Galápagos archipelago and is localized, at around 570- 700 m., on the summit of the island San Cristobal (Chatham), which it is the oldest of the islands as its age is estimated between 4 and 2.4 million years.

Examined specimens
Ecuador, Galápagos Archipelago. San Cristobal (Chatam): El Junco 660 m.(AVT); San Cristobal, pampa 500-700m (IRScNB)

Notes: Brachypterous, most specimens of C. linelli have been found in open ground with few shrubs. Most probably it is nocturnal. Sometimes you meet it wandering in the day but more often it is hidden under stones and debris, sometimes can be found wandering on trails at night and can be captured with pitfail traps. Active specimens were captured in June, October and in February, but according to Peck (2006: 106) the species should be active between January and May.
C. linelli has been noted as host of the fungus Laboulbenia flagellata Peyritsch. It has been suggested that this is due to occasional predation on the much more frequently-parasitized Platynus calathoides as well as Platynus darwini that co-occur in the fern-sedge zone at higher elevations of the island (Arndt and Desender, 2002: 158).
The species has been named after Martin Larsson Linell (1849-1897) assistant at National Museum of Natural History, Washington.

Calosoma (Castrida) linelli
Mutchler, 1925
Galápagos archipelago, San Cristobal Is., El Junco 660m.
(sous pierre), 4.X.85, Pierre Moret lgt. (coll Vigna Taglianti)

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