Calosoma macrum

LeConte, 1853

long caterpillar hunter

Calosoma macrum is a large in the , commonly known as the long hunter. It was described by John Lawrence LeConte in 1853. The is found in the southwestern United States and northern Mexico, where it inhabits mid-elevation open areas. are active that hunt caterpillars, including species.

Calosoma macrum by (c) Annika Lindqvist, some rights reserved (CC BY), uploaded by Annika Lindqvist. Used under a CC-BY license.Calosoma macrum by (c) Bob Nieman, some rights reserved (CC BY), uploaded by Bob Nieman. Used under a CC-BY license.Calosoma (Callitropa) macrum (34959744946) by Insects Unlocked . Used under a CC0 license.

Pronunciation

How to pronounce Calosoma macrum: /kæloʊˈsoʊmə ˈmækrəm/

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Identification

Distinguished from other Calosoma by its uniformly black coloration (lacking metallic or colored markings present in many ), large size (24–30 mm), and geographic range. The related Calosoma sayi (black hunter) is similar in color but occurs in different regions; C. scrutator (fiery searcher) and C. wilcoxi have distinctive metallic green or purple coloration. The species name 'macrum' (meaning 'long') refers to its relatively elongated body form compared to some congeners.

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Appearance

are uniformly black with a , elongated body. Length ranges from 24–30 mm. The are prominent, forward-directed, and sculptured. have longer than wide, appearing filamentous rather than bead-like. The overall build is characteristic of large Calosoma .

Habitat

Mid-elevation open areas, including grasslands and open woodlands. Occurs at elevations of 1,000–1,600 meters. Prefers with exposed soil surfaces and sparse vegetation.

Distribution

Mexico (Coahuila, Tamaulipas) and the United States (Arizona, Louisiana, New Mexico, Oklahoma, Texas). The spans the Chihuahuan Desert and adjacent regions, with in Louisiana and Oklahoma suggesting broader historical range or specificity.

Diet

Active specializing on . are known to ascend trees to hunt caterpillars, a characteristic of the Calosoma. Specific records for this are limited, but related species consume fall cankerworms, spring cankerworms, , and eastern .

Behavior

are fast-running, and . When disturbed, individuals may release defensive chemicals including methacrylic acid and salicylaldehyde, as documented in . The is capable of and has been observed at ultraviolet lights. foraging —climbing trees to hunt —is inferred from -level traits and has been explicitly documented in related Calosoma species.

Ecological Role

of , including potential . May contribute to of defoliating in forest and woodland . fluctuations may follow caterpillar cycles.

Human Relevance

for agriculture and forestry due to on pests. No significant negative impacts documented. Defensive secretions can cause temporary skin irritation if handled.

Similar Taxa

  • Calosoma sayiSimilar uniformly black coloration and 'black hunter', but C. sayi occurs primarily in eastern and central North America with range overlap limited; C. macrum is slightly larger on average and restricted to southwestern US and Mexico
  • Calosoma scrutatorShares large size and -hunting , but C. scrutator has distinctive metallic green to purple coloration with coppery reflections, especially on the
  • Calosoma wilcoxiSimilar and , but C. wilcoxi is smaller (approximately one-third the size), has metallic coloration, and occurs in more eastern and northern regions

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