Antrodiaetus coylei, Cokendolpher, James C., Peck, Robert W. & Niwa, Christine G., 2005

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 : 20-21

Antrodiaetus coylei n. sp.

Figs. 1 , 7 , 12 , 24–25 , 35 , 40–41 , 50

Antrodiaetus new sp. #1: Niwa & Peck 2002:791.

Type Material. Oregon (all collected on 11 Oct. 1998 by Niwa and Peck USFS): Jackson County, Ashland Watershed, Ashland Ranger District, Rogue River National Forest: N42°9’50.2”, W122°42’24.9” (926–1024 m elevation) (male holotype, NMNH; 18 male paratypes, WFIC); N42°8’58.0”, W122°41’14.3” (1219–1268 m elevation) (3 male paratypes, TTU); N42°8’58.0”, W122°42’24.9” (1000–1146 m elevation) (21 male paratypes, JCC); N42°8’5.7”, W122°42’24.9” (1463 m elevation) (2 male paratypes, TTU); N42°8’5.7”, W122°41’14.3” (1317–1365 m elevation) (6 male paratypes, AMNH).

Diagnosis. This species differs from many members of the genus by having the three opisthosomal sclerotized patches fused into a single scutum ( Fig. 12 ). Others with this characteristic occur in Japan, eastern North America, and the Pacific Northwest of the USA (Oregon: A. metapacificus n. sp. and Washington: A. cerberus Coyle ). Antrodiaetus coylei n. sp. can be easily distinguished from A. metapacificus n. sp. and A. cerberus by having a small cheliceral distodorsal projection ( Fig. 35 ).

Etymology. The specific epithet honors Dr. Fred Coyle for his many excellent studies in arachnology. His work has led the way for others to know Antrodiaetidae .

Distribution. Known only from the Ashland Ranger District, Rogue River National Forest, Jackson County, Oregon ( Fig. 1 ).

Description. Female unknown. Male (n = 51): body large, total body length 12.2 (10.6, 13.65), and orangish­brown, appendages and sclerotized patches on opisthosoma more evenly brown, dark brown pigment encircling anterior median eyes and between posterior median and lateral eyes. In freshly collected material the body and legs appear more greenish­brown in coloration.

Dorsal shield of the prosoma 6.3 (4.95, 6.4) [mean ± s.d., 5.88 ± 0.32 (n = 50)] long, 4.55 (3.7, 4.8) wide, with thin weak setae scattered sparsely over pars thoracica except slightly denser along lateral and posterior borders.

Opisthosoma 5.9 (5.65, 7.25) long, 3.55 (3.5, 5.5) wide; all three dorsal sclerotized patches fused into single scutum ( Fig. 12 ); male genital plate with sclerotized parts undivided, slightly to strongly recurved (24–25).

Chelicera with large area on upper ectal surface without setae; with distodorsal projection ( Fig. 35 ).

Palp with tibia swollen. Tibia 2.3–2.7 times longer than wide; widest in proximal third; 3.55 (3.0, 3.4) long, 1.3 (1.15, 1.45) wide. Tip of outer conductor sclerite ( Fig. 50 ) roundly pointed; closely appressed to inner conductor sclerite. Tip of inner conductor sclerite well sclerotized and not curved.

Leg I ( Figs. 40–41 ) without any segment being greatly enlarged or modified with processes; femur 5.2 (4.8, 5.55) long, patella 2.3 (2.1, 2.4) long, tibia 3.75 (3.35, 3.65) long, 1.35 (1.1, 1.2) wide, metatarsus 4.55 (4.1, 4.75) long, tarsus 2.35 (2.25, 2.6) long. Macrosetae with 21–42% being ensiform: with 48 (13 ensiform) [43 (9 ensiform), 38 (16 ensiform)] macrosetae. Tibia I with 11 (6 large) [5, 14 (6 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 = 1.3 times greatest width of segment.

Variation. One of the males is yellowish­brown in color; much lighter in coloration than any of the other specimens. It does not otherwise differ remarkably from the rest of the specimens and was collected in the same general area (from N42°8’58.0”, W122°42’24.9”) as normally colored males. Therefore, it is considered teneral and not normal variation in coloration.

Wandering Activity. All 51 males were collected on 11 October 1998 ( Fig. 7 ).

Comment. Antrodiaetus coylei n. sp. was only collected in the eastern Siskiyou Mountains study area. It was collected in 16 of 18 sites but was not particularly abundant in any one site, ranging from 1–7 individuals per site.

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

FIGURES 12 – 15. Dorsal view of male body. 12, Antrodiaetus coylei n. sp.; 13, Antrodiaetus effeminatus n. sp.; 14, Antrodiaetus metapacificus n. sp.; 15, Antrodiaetus pacificus (Simon). Not to scale; see text for approximate sizes of the different species. Arrows indicate sclerotized patches.

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 34 – 37. Ectal view of male left chelicera. 34, Antrodiaetus ashlandensis n. sp.; 35, Antrodiaetus coylei n. sp.; 36, Antrodiaetus effeminatus n. sp.; 37, Antrodiaetus metapacificus n. sp. Scale lines = 0.5 mm.

FIGURES 38 – 41. Male left tibia I and metatarsus I. 38 – 39 Antrodiaetus ashlandensis n. sp. (38, prolateral view; 39, ventral view). 40 – 41, Antrodiaetus coylei n. sp. (40, prolateral view; 41, ventral view). Scales = 0.5 mm in 0.1 mm divisions.

FIGURES 49 – 52. Prolateral view of entire palp (left) and view of tip after palp rotated 90 ° on longitudinal axis of distal half of inner conductor sclerite. 49, Antrodiaetus ashlandensis n. sp.; 50, Antrodiaetus coylei n. sp.; 51, Antrodiaetus effeminatus n. sp.; 52, metapacificus n. sp. Scale lines = 0.1 mm.