Promyrmekiaphila winnemem, Stockman, Amy K. & Bond, And Jason E., 2008

Stockman, Amy K. & Bond, And Jason E., 2008, A taxonomic review of the trapdoor spider genus Promyrmekiaphila Schenkel (Araneae, Mygalomorphae, Cyrtaucheniidae, Euctenizinae), Zootaxa 1823, pp. 25-41 : 38-40

Promyrmekiaphila winnemem sp. nov.

( Figures 4, 5 , 8–11 , 14–24 , 34–41)

Types: Male holotype, female paratype from Platina Rd, 3.5 mi SE of Ono [40.4405 -122.6666, PR025, PR027], Shasta Co, California (17 Jul 1974, W.R. Icenogle) deposited in CAS.

Genbank Accessions: EF542857 , EF542929 , EF542932 –33, EF542938 , EF542956 –58, EF542976 , EF543048 , EF543051 –52, EF543057 , EF543075 –77.

Etymology: The specific epithet honors the Winnemem Wintu Indian Tribe, traditional owners of the region and their resistance to the enlargement of the Shasta Dam.

Diagnosis: Males can be recognized by a small conical mound on retrolateral side of metatarsus I (Figs 34, 35, 39, 40). Females are distinguished by short, stout spermathecae with a long side branch (Figs 37, 38, 41). Both features are absent in all adult P. clathrata specimens examined (males and females respectively).

Male (Holotype): Pedipalp, leg I left side removed and stored in vial with specimen. General coloration. Coloration greatly faded. Carapace, chelicerae, and legs strong brown (7.5YR 5/6), abdomen light yellowish brown (10YR 6/4) with dark yellowish brown (10YR 3/4) chevron pattern on dorsum, spinnerets yellow (10YR 7/6). Recently collected specimens generally darker and abdominal chevron less distinct. Cephalothorax. Carapace 4.35 long, 3.88 wide, stout dark brown bristles along fringe. Sternum moderately setose, STRl 2.58, STRw 2.30. Posterior sternal sigilla very large, positioned centrally, not contiguous, anterior sigilla pairs small, oval, marginal. Chelicerae with distinct promargin tooth row (seven teeth), retromargin with patch of small denticles. Labium lacking cuspules, LBw 0.69, LBl 0.48. Rastellum of four very stout spines; fringe of smaller spines along distal promargin extending upward from rastellum. Abdomen. Moderately setose. PLS terminal segment half length of medial segment, one enlarged spigot visible at tip, two smaller spigotsdisplaced proximally from tip. Legs. Slender. Leg I: 4.69, 2.00, 3.64, 2.79, 2.02. Leg IV: 4.50, 1.73, 4.04, 3.80, FIGURES 34–41. Promyrmekiaphila winnemem sp. nov. male holotype from Shasta Co. (PR025) and female from Tehama Co. (MY3185): ɗ left leg I, prolateral view (34, 39); retrolateral view (35, 40); ɗ left pedipalp, prolateral view (36), spermathecae (37, 38, 41).

2.23. Metatarsus I with very slight ventral–to–retrolateral excavation on proximal third bordered distally by very low, conical mound. Tarsus with single staggered row of ten trichobothria. Legs I–IV with moderately light scopulae on tarsi, light scopulae on metatarsus I–II. Leg I spination pattern (Figs 39, 40: TSp 2, TSr 2). Pedipalp. Articles lacking distinct spines. PTl 1.86, PTw 0.75, Bl 0.81. Embolus slender, tapering sharply toward tip.

Female (Paratype): Left leg I removed and placed in vial with specimens. Genital plate removed and stored in microvial with specimens. Coloration. Carapace, legs, chelicerae strong brown (7.5YR 4/6), abdomen dark yellowish brown (10YR 4/4) dorsally, ventrum and spinnerets light yellowish brown, dorsum with thin chevron. Cephalothorax. Carapace 6.06 long, 4.76 wide, generally smooth surface. Fringe lacks setae. Sternum moderately setose, STRw 2.73, STRl 3.03. Three pairs of sternal sigilla, anterior pairs small, oval, marginal, posterior pair much larger, oval, mesially positioned. Chelicerae, promargin tooth row armed with six teeth, retromargin with denticle patch. Labium without cuspules, LBl 0.65, LBw 1.00. Rastellum of four to five very stout spines; fringe of short, stout spines along distal promargin extending upward from rastellum. Abdomen. Moderately setose. PLS terminal segment half length of medial segment, one enlarged spigot at tip, two smaller spigots displaced proximally. Legs. Leg I: 4.08, 1.63, 2.63, 1.83, 1.44. Leg IV: 4.35, 1.70, 3.15, 2.79, 1.54. Tarsus I with single staggered row of 13 trichobothria. PT3s 4, TB3s 10. Very rudimentary metatarsal preening comb at tarsal–metatarsal joint of leg IV. Spermathecae. Spermathecal bulb terminates in short, stout stalk. Stalk with long, lateral protuberance with bulbous tip

Variation (4). Cl 5.60–7.36; Cw 4.76–6.56; STRl 2.95–4.20; STRw 2.73–4.00; LBl 0.65–0.90; LBw 0.95–1.31; Leg I: 3.92–5.25, 1.63–2.34, 2.63–3.45, 1.78–2.43, 1.33–1.76; Leg IV: 4.10–5.15, 1.70–2.55, 3.09–4.12, 2.76–3.92, 1.47–2.08.

Other Material Examined: UNITED STATES: CALIFORNIA: Shasta Co: Platina Rd, 3.5 mi SE of Ono, 40.4405 –122.6666 [PR025–7], 17 Jul1 974 (W.R. Icenogle, CAS), ɗ, Ψ, Ψw/spiderlings; Swasey Dr & Hwy 299, 0.5 mi SE of Shasta, 40.5904 –122.4785 [PR076], 16 Jul 1974 (W.R. Icenogle, CAS), 4 juv; Platina Rd, 2.9 mi NE of Hwy 36, 40.36566 –122.858 [MY03174], 22 May 2005 (A. Stockman, ECU – CAS), juv; Swasey Dr, 1/ 4 mi S of Hwy 299, 40.58994 –122.48178 [MY02987, 3053–6], 16 Mar 2005 (J. Bond, A. Stockman, D. Beamer, ECU – CAS), 4Ψ, juv; A18/ Lake Blvd, 1/ 2 mi S of Shasta Lake Natl Rec Area border, 40.70649 –122.40508 [MY03177–8], 23 May 2005 (A. Stockman, ECU – CAS), 2 juv; Tehama Co: Hwy 36, 12.8 mi E of Bowman Rd/A5, 40.22334 –122.32868 [MY03183–5], 23 May 2005 (A. Stockman, ECU – CAS), Ψw/spiderlings, 2 juv; Bowman Rd/A5, 6.6 mi N of Hwy 36, 40.32993 –122.40871 [MY03179–82], 23 May 2005 (A. Stockman, ECU – CAS), 2Ψ, 2 juv.

Distribution: Known only from Shasta and Tehama Counties of northern California, north and west of the Central Valley ( Fig. 4 ).

Figures

FIGURES 4 – 6. Distribution of Promyrmekiaphila in northern California. Circles represent known localities of P. c l a t h - rata, triangles represent P. winnemem sp. nov. Niche-based distribution models (redrawn from Stockman & Bond, 2007), indicating potentially suitable habitat for each species: P. winnemem (5); P. clathrata (6).

FIGURES 8 – 13. Promyrmekiaphila winnemem sp. nov. female (MY 3053) from Swasey Dr., Shasta Co., CA (8 – 11). Cephalothorax (8, 9, 10); leg I, prolateral aspect (11). Cephalothorax P. clathrata male (PR 067) from Hopland Field Station, Mendocino Co., CA (12, 13).

FIGURES 14 – 25. Promyrmekiaphila winnemem sp. nov. female (MY 3053) from Swasey Dr., Shasta Co., CA (14 – 24): Right palpal endite (14); right chelicerae (15); trichobothrium base, leg I (16); leg I tarsal organ (17); left pedipalp tarsal claw (18); left leg I superior tarsal claw (19); left leg IV superior tarsal claw (20); spinnerets (21); terminal segment of left posterior lateral spinneret (22); spigots on tip of left posterior lateral spinneret (23); left posterior median spinneret (24). Right palpal bulb, prolateral aspect, from a P. clathrata male (PR 067) from Hopland Field Station, Mendocino Co., CA (25).