Atypoides gertschi Coyle

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 : 15-16

Atypoides gertschi Coyle

Figs. 1 , 3 , 6 , 10 , 16–17

Atypoides gertschi Coyle 1968:176 –184, figs. 7–9, 15, 20–21, 30, 35–36, 41, 50–52, 58–67, 74–77, 90–94; Niwa & Peck 2002:789 –791; Platnick 2005.

Material Examined (m = male, f = female, i = immature). Oregon (all collected by Niwa and Peck USFS): Jackson County, Ashland Watershed, Ashland Ranger District, Rogue River National Forest, 1998: N42°9’50.2”, W122°42’24.9” (926–1024 m elevation), 15 June (1i), 8 July (1i), 17 Aug. (1m, 1i), 1 Sept. (7m); N42°8’58.0”, W122°41’14.3” (1219– 1268 m elevation), 15 June (1i), 8 July (1f, 3i), 20 July (1i), 17 Aug. (32m, 2i), 1 Sept. (16m), 29 Sept. (1m); N42°8’58.0”, W122°42’24.9” (1000–1146 m elevation), 20 July (1i), 17 Aug. (36m, 3i), 1 Sept. (23m); N42°8’5.7”, W122°42’24.9” (1463 m elevation), 15 June (2i), 8 July (2i), 17 Aug. (59m, 2i), 1 Sept. (43m), 29 Sept. (3m), 11 Oct. (2i); N42°8’5.7”, W122°41’14.3” (1317–1366 m elevation), 15 June (2f, 2i), 8 July (5i), 20 July (2i), 17 Aug. (20m, 4i), 1 Sept. (23m), 29 Sept. (2m), 11 Oct. (4i). Jackson County, Ashland Resource Area, Medford District, Bureau of Land Management, 1999: N42°8’58.0”, W122°24’45.7” (1372–1524 m elevation), 2– 4 Aug. (4m); N42°8’5.7”, W122°25’56.3” (1372–1524 m elevation), 2– 4 Aug. (1m); N42°10’42.4”, W122°22’24.5” (1372–1524 m elevation), 2– 4 Aug. (3m), 16–18 Aug. (1m), 13–15 Sept. (1m); N42°9’50.2”, W122°21’13.8” (1372–1524 m elevation), 2– 4 Aug. (2m), 16–18 Aug. (2m); N42°4’36.9”, W122°21’13.8” (1372–1524 m elevation), 16–18 Aug. (4m), 13–15 Sept. (1m).

Diagnosis. Anterior pair of spinnerets essentially round in A. gertschi ; all spinnerets clearly longer than wide in other species of Atypoides .

Distribution. Cascade and eastern Siskiyou Mountains in southern Oregon south and east into the northern Sierra Nevada Mountains of California ( Figs. 1 , 3 ; Coyle 1968: map 1).

Wandering Activity. Male wandering activity was concentrated between late July and early September while females were active June­early July ( Fig. 6 ). Immatures were collected throughout the trapping period in 1998 but only in late June in 1999.

Comments. Atypoides gertschi was found in the eastern Siskiyou and southern Cascades Mountains study areas. Within the eastern Siskiyou Mountains it was the third most abundant spider collected, comprising 8.1% of the total, and was collected in 12 of 18 sites. Although it was found in both burned and unburned sites (5 burned and 7 unburned sites), 72.1% of adults collected were from unburned sites. Atypoides gertschi was found in 8 of 16 sites in the southern Cascade Mountains (3 thinned and 5 unthinned sites), but was considerably less common, comprising only 0.6% of the total number of spiders collected. Overall, only 5 of 290 individuals collected were female. Known biological information for this species has been summarized by Coyle (1971).

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 3. Map of southwestern Oregon (insert shows position of region within state) showing the distribution of Antrodiaetus occultus Coyle (triangles), Antrodiaetus montanus (Chamberlin & Ivie) (diamond), Atypoides gertschi Coyle (squares), and Hexura rothi Gertsch & Platnick (circles). Symbols from this study are closed whereas those recorded by Coyle (1971) and Gertsch & Platnick (1979) are open.

FIGURE 6. Abundance of (male, female and immature) Atypoides gertschi Coyle collected in pitfall traps from eastern Siskiyou (during 1998) and southern Cascade (1999) Mountains.

FIGURES 8 – 11. Dorsal view of male body. 8, Microhexura idahoana Chamberlin & Ivie (note spur on tibia I); 9, Hexura rothi Gertsch & Platnick; 10, Atypoides gertschi Coyle; 11, Antrodiaetus ashlandensis n. sp. Not to scale; see text for approximate sizes of the different species. Arrows indicate sclerotized patches.

FIGURES 16 – 21. Characters of Mecicobothriidae and Antrodiaetidae. 16, Hexura rothi Gertsch & Platnick (male: 16, ventral view of spinnerets). 17 – 18, Atypoides gertschi Coyle (male: 17, dorsolateral view of chelicerae; 18, ventral view of spinnerets, arrow indicates third spinneret). 19 – 20, Antrodiaetus ashlandensis n. sp. (male: 19, dorsolateral view of chelicerae; 20, ventral view of spinnerets). 21, Antrodiaetus montanus (Chamberlin & Ivie) (male: dorsolateral view of chelicerae, insert shows dorsal view of chelicera with even coat of setae on middle portion). Not to scale.