Selenops trifidus Bryant, 1948

Crews, Sarah C., 2011, A revision of the spider genus Selenops Latreille, 1819 (Arachnida, Araneae, Selenopidae) in North America, Central America and the Caribbean, ZooKeys 105, pp. 1-182 : 96-97

Selenops trifidus Bryant, 1948 Figs 131-132Map 12

Selenops trifidus Bryant 1948: 415, pl. 10, Figs 98, 100 (♂, examined).

Selenops trifidus : Muma 1953: 25, Figs 41-42 (♂).

Type material.

Holotype male: Navassa Island, 1-9.I.1930, Clench, Schevill, Rehder (MCZ-B0045).

Diagnosis.

Males can be easily distinguished from other species by the large base and distal hook of the MA, and the small process on the distal end of the dorsal branch of the RTA (Figs 131-132). Females unknown.

Remarks.

The type was apparently not in great shape when Muma (1953) viewed it 60 years ago. Since Muma's (1953) descriptions, it appears to be even more discolored.

Description.

Male holotype: Color:carapace orange-brown with no markings; sternum orange-brown; chelicerae orange-brown; maxillae orange-brown, lightening distally; labium orange-brown, lightening distally; abdomen dorsally brown-grey, markings indistinct due to shrivelling, laterocaudal festoon distinct; legs orange-brown. Carapace: 0.86 times longer than broad; fovea longitudinal, broad, very shallow. Eyes:AER nearly straight; PER recurved; AME slightly larger than PME, PLE largest, ALE smallest; eye diameters, AME 0.28, ALE 0.13, PME 0.20, PLE 0.45; interdistances AME-PME 0.03, PME-ALE 0.38, ALE-PLE 0.18. PME-PME 1.23. ALE-ALE 1.90; ocular quadrangle AME-AME 0.40, PLE-PLE 2.23; clypeus 0.91 high. Mouthparts:chelicerae with a few scattered setae medially and anteriorly; maxillae longer than broad, with tuft of conspicuous setae distally; labium distally rounded. Sternum:0.95 times longer than broad, posteriorly indented. Legs:leg I only slightly shorter than II and III; leg formula 2314; scopulae present on tarsi of all legs and metatarsi of legs I and II; tarsi I-IV with strong claw tufts; pr claw per foot slightly toothed; spination: leg I, Fm pr 1 –1– 1, d 1 –1– 1, rl 1 –1– 1; Ti d 1 –1– 0, pr 1 –1– 0, rl 1 –1– 0, v 2 –2–2– 2; Mt pr 1 –1– 0, v 2 –2– 0, rl 1 –0– 0; leg II, Fm pr 1 –1– 1, d 1 –1– 1, rl 1 –1– 1; Ti pr 1 –1– 0, rl 1 –1– 0, d 1 –1– 0, v 2 –2–2– 2; Mt pr 1 –1– 0, v 2-2, rl 1 –1– 0; leg III, Fm pr 1 –1– 1, d 1 –1– 1, rl 1 –1– 0; Ti pr 1 –0– 1, d 0 –1– 0, rl 1 –0– 1, v 2 –2–1– 2 (2 –2– 2 on R side); Mt pr 1 –1– 1, rl 1 –0– 0, v 2-2; leg IV, Fm pr 1 –1– 1, d 1 –1– 1, rl 1 –1– 1; Ti pr 1 –0– 1, rl 1 –0– 1, d 1 –1– 0, v 2-2; Mt pr 1 –1– 0, rl 1 –0– 0, v 2 –2– 0. Abdomen:without terminal setal tufts. Pedipalp:Fm, spination d 0 –1– 3;cymbium triangular in ventral view, angled slightly posterolaterally; conductor large, arising from short straight stalk anteromedially, pointed laterally, reconnecting laterally, forming oblong space between two conductor connections; embolus long, slender, curved, not quite at edge of cymbium, beginning at 6 o'clock, terminating at 12 o'clock; MA with very large oval base, narrowing abruptly into long hook, arising from 2-4 o'clock, directed distally; RTA with two apophyses, ventral process shorter, narrower than lateral process, curves away from cymbium, rounded distally; lateral process large, curves away from cymbium, widens distally, truncate to sinuous terminally, with pointed process directed ventrally; RTA barely reaching cymbium in ventral view (Figs 131-132). Dimensions: Total length 6.45. Carapace length 3.90, width 4.53. Sternum length 1.75, width 1.85. Abdomen length 2.58, width 2.40. Pedipalp: Fm 1.45, Pt 0.40, Ti 0.75, Ta 1.25, total 3.85. Leg I: Fm 5.00, Pt 2.00, Ti 5.50, Mt 5.50 Ta 2.50, total 20.50. Leg II: Fm 5.75, Pt 2.00, Ti 6.00, Mt 6.00, Ta 2.50, total 22.25. Leg III: Fm 6.00, Pt 2.00, Ti 5.50, Mt 5.50, Ta 2.00, total 21.00. Leg IV: Fm 5.75, Pt 1.75, Ti 5.00, Mt 5.00, Ta 2.00, total 19.50.

Natural history.

No data.

Distribution.

Known only from the type locality, and thus appears to be endemic to the mostly uninhabited, politically contested Navassa Island (Map 12).