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Montana Field Guide

Montana Field Guides

A Millipede - Austrotyla montani

Species of Concern
Native Species

Global Rank: G1G3
State Rank: S1S3

Agency Status


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General Description
Genus Austrotyla: Posterior colpocoxites of male gonopds more complex than simply consisting of long, thin structure partially sheathed at base by sternal process, posterior colpocoxites of male gonopods lacking articulated basal flagellum, anterior gonopods flattened (more or less plate-like), usually larger than posterior gonopod colpocoxites, with lateral sternal processes at least partially fused to lateral regions of anterior gonopods, posterior gonopods with telopodites, anterior gonopods not fused and with sternum entire, anterior gonopods larger than posterior gonopod colpocoxites (Shear 1976).

[From Loomis and Schmitt 1971] Austrotyla montani: Length of largest male 8 mm, largest female 11 mm. Eye group subtriangular, ocelli 18-20, in four series as 2, 4, 6, 8, or 3, 4, 5, 7, beginning nearest antenna. Fairly large and definite pronotum present above a broad, subbasally depressed mentum. Anterior gonopods (peltogonopods) somewhat separated, narrower, more nearly parallel-sided, with apex truncate rather than rounded. Posterior gonopods essentially as in other species. Male legs 3 and 4 with joint 4 swollen, the ventral digitate process large and nearer distal end of joint. Coxae of tenth legs each with a long subcylindrical process in front, slightly constricted near middle, projecting forward between second joints of gonopods and outer edge of peltogonopods.

Adults reported early April to late October, young reported in mid-October (Loomis and Schmitt 1971).

Diagnostic Characteristics
Closely related to Austrotyla montivaga, but with differences of the gonopods and location of lobe of fourth joint of male legs 3 and 4 (Loomis and Schmitt 1971). The male tenth coxae also with lobes, lacking in A. borealis (Shear 1976).

Range Comments
Endemic to Montana. Reported only from Missoula County (Loomis and Schmitt 1971); to about 975 m elevation.

Observations in Montana Natural Heritage Program Database
Number of Observations: 4

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Found under logs and rocks in or near riparian areas, probably under a mixed deciduous and conifer tree canopy (Loomis and Schmitt 1971).

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Citation for data on this website:
A Millipede — Austrotyla montani.  Montana Field Guide.  .  Retrieved on , from