Antrodiaetus ashlandensis Cokendolpher, Peck & Niwa, 2005, n. sp.
Creators: name: Cokendolpher, James C.
name: Peck, Robert W.
name: Niwa, Christine G.
Publisher: name: Zenodo
Year: 2005
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Antrodiaetidae
Antrodiaetus
Antrodiaetus ashlandensis

description: Antrodiaetus ashlandensis n. sp.   
Figs. 1, 7, 11, 19–20, 22–23, 34, 38–39, 49  
 Type Material. Oregon (all collected in 1998 by Niwa and Peck USFS): Jackson County, Ashland Watershed, Ashland Ranger District, Rogue River National Forest: N42°85’8.0”, W122°42’24.9” (1000–1146 m elevation), 29 Sept. (3m, AMNH), 11 Oct. (male holotype, NMNH), (4 male paratypes, JCC); N42°9’50.2”, W122°42’24.9” (926–1024 m elevation), 11 Oct. (4 male paratypes, WFIC); N42°8’58.0”, W122°41’14.3” (1219–1268 m elevation), 29 Sept. (1 male paratype, JCC); N42°8’5.7”, W122°42’24.9” (1463 m elevation), 11 Oct. (1 male paratype, JCC); N42°8’5.7”, 122°41’14.3” (1317–1365 m elevation), 29 Sept. (2 male paratypes, AMNH), 11 Oct. (3 male paratypes, TTU).   
 Diagnosis. The separation of this species from others of the region requires examination of several characters. The combination of no cheliceral distodorsal projection or setal coat on upper ectal surface (Figs. 19, 34), having all three dorsal opisthosomal sclerotized patches separate (Fig. 11), and by having a prolateral brush of macrosetae on tibia I (Fig. 38, 39) will distinguish the new species from all congeners except A. pugnax and A. occultus. It can be separated from A. pugnax by not having the leg I segments of the male enlarged (Fig. 48 versus Fig. 38) and from A. occultus it differs by not having the macrosetae of tibia I extending to the distal end (Fig. 47 versus Fig. 38).   
 Etymology. The species name is based on the region of Oregon where this spider was discovered.   
 Distribution. Known only from Ashland Ranger District, Rogue River National Forest, Jackson County, Oregon (Fig. 1).   
 Description. Female unknown. Male (n = 19): body large, total body length 11.4 (9.6, 11.5). Color: orangish­brown, sclerotized patches on opisthosoma more evenly brown, dark brown pigment encircling anterior median eyes and between posterior median and lateral eyes.   
Dorsal shield of prosoma 5.5 (5.05, 5.85) [mean ± s.d., 5.44 ± 0.23 (n = 19)] long, 4.35 (3.9, 4.55) wide, with setae scattered sparsely over pars thoracica except very densely along lateral and posterior borders.  
Opisthosoma 5.9 (4.55, 5.65) long, 4.1 (3.3, 4.15) wide; all three dorsal sclerotized patches separate (Fig. 11); male genital plate with sclerotized parts divided, straight to recurved (Figs. 22–23).  
Chelicera with large area on upper ectal surface without setae; without distodorsal projection (Figs. 19, 34).  
Palp with tibia swollen. Tibia 2.56–2.68 times longer than wide; widest in proximal third; 3.2 (3.1, 3.35) long, 1.25 (1.2, 1.25) wide. Tip of outer conductor sclerite (Fig. 49) roundly pointed; not appressed to inner conductor sclerite. Tip of inner conductor sclerite well sclerotized and not curved.  
Leg I (Figs. 38–39) without any segment being greatly enlarged or modified with processes; femur 5.6 (5.25, 5.8) long, patella 2.2 (2.15, 2.45) long, tibia 3.75 (3.6, 3.9) long, 0.8 (0.75, 0.95) wide, metatarsus 4.35 (4.1, 4.45) long, tarsus 2.7 (2.4, 2.75) long. Tibia I with relatively dense group of prolateral macrosetae medially (not reaching distal end of segment). Macrosetae with 40.5–43.3% being ensiform: with 26 (11 ensiform) [30 (13 ensiform), 37 (15 ensiform)] macrosetae. Tibia I with 11 (7 large) [11 (7 large), 13 (8 large)] medial (not extending to distal end) macrosetae ventrolaterally, the longest seta at most about width of tibia (about as long as prolateral macrosetae). Tibia I without large heavy macrosetae ventrally; tibia and metatarsus I not swollen in lateral view; metatarsus I sinuous, without macrosetae ventrally; other setae ventrally on metatarsus I = 2 times greatest width of segment.  
 Wandering Activity. All 19 males were collected on 29 September (6) and 11 October (13) 1998 (Fig. 7).   
 Comment. Antrodiaetus ashlandensis n. sp. was collected in 9 of 18 sites within the eastern Siskiyou Mountains study area. Six of the sites had previously experienced prescribed underburning.
description: Published as part of Cokendolpher, James C., Peck, Robert W. & Niwa, Christine G., 2005, Mygalomorph spiders from southwestern Oregon, USA, with descriptions of four new species, pp. 1-34 in Zootaxa 1058 on pages 16-17, DOI: 10.5281/zenodo.170130