Antrodiaetus pugnax (Chamberlin)

Cokendolpher, James C., Peck, Robert W. & Niwa, Christine G., 2005, Mygalomorph spiders from southwestern Oregon, USA, with descriptions of four new species, Zootaxa 1058, pp. 1-34 : 32-33

Antrodiaetus pugnax (Chamberlin)

Figs. 1 , 4 , 7 , 33 , 48

Antrodiaetus pugnax: Coyle 1971 , 354, figs. 109–112, 124, 132, 161, 179, 207–212, 250–252, 292– 294; Niwa & Peck 2002:791; Platnick 2005 (see for complete synonymy).

Material Examined (m = male). Oregon, Jackson County, Ashland Watershed, Ashland Ranger District, Rogue River National Forest, 1998: N42°85’8.0”, W122°41’14.3” (1219– 1268 m elevation), 29 Sept. (1m); N42°8’5.7”, W122°42’24.9” (1463 m elevation), 29 Sept. (11m), 11 Oct. (4m); N42°8’5.7”, W122°41’14.3” (1317–1365 m elevation), 29 Sept. (10m), 11 Oct. (5m). Josephine County, 2001: Illinois Valley Ranger District, Siskiyou National Forest, N42°07’23”, W123°24’25” to N42°08’05”, W123°20’30” (1280–1494 m elevation), 4 Sept. (16m), 17 Sept. (6m), 9 Oct. (9m). Ashland Resource Area, Medford District, Bureau of Land Management, N42°01’34”, W123°27’42” (1646 m elevation), 4 Sept. (9m), 17 Sept. (2m), 9 Oct. (1m).

Diagnosis. The presence of a ventral prominence on tibia and metatarsus I and a group of macrosetae on the tibial I swelling ( Fig. 48 ) will separate males of this species from all others in the genus.

Abbreviated Description. With three (occasionally two) separate dorsal opisthosomal sclerotized patches; male genital plate with sclerotized parts divided, straight to slightly recurved ( Fig. 33 ); chelicera without distodorsal projection, without setae on upper ectal surface; with prolateral brush of macrosetae on tibia I ( Fig. 48 ), 67–100% of macrosetae ensiform; tibia I with 2–9 macrosetae retrolaterally, without large heavy macrosetae ventrally; middle of tibia and metatarsus I each greatly swollen in lateral view; metatarsus I weakly sinuous, with pair (setae A–B) of distal macrosetae ventrally; tip of palpal outer conductor sclerite closely appressed to inner conductor sclerite; palpal tibia 2.26–2.42 times longer than wide.

Distribution. Oregon, southern Washington, into northwestern Idaho ( Figs. 1 , 4 ; Coyle 1971: map 2).

Wandering Activity. All individuals were trapped between late August and early October ( Fig. 7 ).

Comments. Antrodiaetus pugnax was limited to the Siskiyou Mountains study areas. Within the eastern Siskiyou Mountains it was found in equal abundance in burned and unburned sites (16 in each). Within the western Siskiyou Mountains, it was restricted to plant associations within the white fir type near Oregon Caves National Monument. Of the 41 individuals collected in the latter area, 22 were in ABCO­SYMO, 14 were in ABCO­ ABMAS/QUSA2 and 5 were in ABCO­BENE2/ACTR plant associations.

All 74 individuals collected were male.

Figures

FIGURE 1. Map of Oregon showing study areas within the Siskiyou and Cascade Mountains and a list of mygalomorph species found in each area [relief map modified from: http: // www. flag. wr. usgs. gov / USGSFlag / Data / maps / Oregon. gif (accessed 31 August 2005)]. Insert shows position of region within the USA.

FIGURE 4. Map of southwestern Oregon (insert shows position of region within state) showing the distribution of Antrodiaetus pacificus (Simon) (circles) and Antrodiaetus pugnax (Chamberlin) (diamonds). Symbols from this study are closed whereas those recorded by Coyle (1971) are open.

FIGURE 7. Abundance of adult male Antrodiaetus spiders collected in pitfall traps from southwestern Oregon.

FIGURES 22 – 33. Genital plates of males. 22 – 23, Antrodiaetus ashlandensis n. sp.; 24 – 25, Antrodiaetus coylei n. sp.; 26 – 27, Antrodiaetus effeminatus n. sp.; 28 – 29, Antrodiaetus metapacificus n. sp.; 30, Antrodiaetus montanus (Chamberlin & Ivie); 31, Antrodiaetus occultus Coyle; 32, Antrodiaetus pacificus (Simon); 33, Antrodiaetus pugnax (Chamberlin). Inserts emphasize sclerotized regions. Scale line = 0.5 mm.

FIGURES 47, 48. Male left leg I, prolateral view of tibia, metatarsus, tarsus. 47, Antrodiaetus occultus Coyle; 48, Antrodiaetus pugnax (Chamberlin). Scale line = 0.5 mm.