Antrodiaetus occultus 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 : 30

Antrodiaetus occultus Coyle

Figs. 3 , 31 , 47

Antrodiaetus occultus Coyle 1971:353 –354, figs. 123, 178, 204–206, 248–249; Platnick 2005.

Material Examined. Oregon: Lane County: Eugene, 2 males (determined by Coyle, 1969) ( AMNH); H. J. Andrews Experimental Forest, 5 males (JMC).

Diagnosis. This species is the only member of the genus which has the tibia I prolateral macrosetae reaching the distal end of the segment on males ( Fig. 47 ).

Abbreviated Description. All three dorsal opisthosomal sclerotized patches separate; male genital plate with sclerotized parts divided, straight to recurved ( Fig. 31 ); chelicera without distodorsal projection, without setae on upper ectal surface; with prolateral brush of macrosetae on tibia I ( Fig. 47 ) which reach distal end of segment, 37–74% of macrosetae ensiform; tibia I with 2–9 macrosetae retrolaterally, without large heavy macrosetae ventrally; tibia and metatarsus I not swollen in lateral view; metatarsus I sinuous, without macrosetae ventrally; tip of palpal outer conductor sclerite not closely appressed to inner conductor sclerite; palpal tibia 2.11–2.25 times longer than wide; males active above ground from late September to early November.

Distribution. Western Oregon between the coast and the Cascade Mountain range ( Fig. 3 ; Coyle 1971: Map 2).

Comments. Examination of voucher material from the study of McIver et al. (1992) revealed the presence of two species: individuals from old growth stands (JMC) are A. occultus and small, yellowish colored specimens (OSAC) from a clearcut stand (3 males) are possibly an undescribed species.

Figures

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.

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.