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Montana Field Guide

Montana Field Guides

Northern Marble - Euchloe creusa

Potential Species of Concern

Global Rank: G5
State Rank: S1S3

Agency Status
USFWS:
USFS:
BLM:


 

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General Description
[From Scott 1986; Opler and Wright 1999; Glassberg 2001; Guppy and Shepard 2001] Forewing about 1.6-2.4 cm. Uppersurface white, with narrow black bar in forewing cell, black scaling at base of both wings and along veins at forewing tip; undersurface of forewing with greenish marbling and yellow tracing veins at wing tip, thin bar in forewing cell, hindwing with extensive green marbling highly fractured with white producing a banded effect, veins traced in yellow.

Phenology
One flight, mostly June to mid-July (Scott 1986). June and July (Glassberg 2001). Mid-May to late July, rarely to early August (Opler 1968; Opler and Wright 1999).

Diagnostic Characteristics
Best determined by a combination of white uppersurface with thin black bar in forewing cell, undersurface of hindwing with extensive green marbling highly fractured with white producing a banded effect, veins traced in yellow.

Species Range
Montana Range

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Range Comments
Holarctic. In North America, Alaska, Yukon, western Northwest Territories south to British Columbia, Alberta, and northwestern Saskatchewan (Opler 1968; Opler and Wright 1999, Glassberg 2001; Guppy and Shepard 2001; Back et al. 2011); 1219 m to at least 2134 m elevation in Alberta, 671 m to at least 1463 m elevation in British Columbia, 701 m to at least 1069 m elevation in the Yukon Territory (Opler 1968). In Montana, reported once, from northwest of Babb (Glacier County) on 7 June 1987 (Kohler 1980, personal communication; Ferris and Brown 1981; Stanford and Opler 1993). Rare (Glassberg 2001).

Migration
Non-migratory.

Habitat
Alpine and arctic tundra, subalpine forest, coniferous forest openings, moraine talus, river flats (Opler 1968; Scott 1986; Opler and Wright 1999; Glassberg 2001; Guppy and Shepard 2001). Habitat in Montana not described but probably similar.

Food Habits
Limited information. Larval food plants include the mustards Arabis glabra and Draba cana (Opler 1974; Scott 1986; Guppy and Shepard 2001). Adults probably feed on flower nectar, but behavior and flower species not reported.

Reproductive Characteristics
Limited information. Females lay eggs singly on host plant flower buds (Opler 1974; Scott 1986). Presumably larvae eat flowers and fruits; likely hibernate on host plant as pupae after developing to L5 instar, as do other Euchloe species (Opler 1968; Scott 1979; James and Nunnallee 2011). Males probably patrol throughout the day over some topographic feature in search of females, similar to other Euchloe species (Scott 1975; James and Nunnallee 2011).

Management
G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.
Management needs: Prevent removal of caterpillar host plants from public lands. Limit collection by permits.

References
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Citation for data on this website:
Northern Marble — Euchloe creusa.  Montana Field Guide.  .  Retrieved on , from