Nylanderia silvula LaPolla and Fisher, sp. nov.
Creators: name: Lapolla, John S.
name: Hawkes, Peter G.
name: Fisher, Brian L.
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Formicidae
Nylanderia
Nylanderia silvula

description: Nylanderia silvula LaPolla and Fisher, sp. nov.
(Figs. 49–51, 84 [worker]; 52–54 [queen]; 55–57, 101–103 [male])
Holotype worker, KENYA: Kakamega District, Kakamega Forest, Isecheno; 0.02° N, 34.97° E, 1800 m, 16 Oct 1999 (coll. R.R. Snelling) (LACM); 13 paratype workers, 1 paratype male, same label data as holotype (LACM, USNM).
Worker diagnosis: Large species (TL ≥ 2.8), with shining reddish-brown cuticle.
Compare with: This species is unique in its overall appearance.
WORKER. Measurements (n = 8): TL: 2.8–3.3; HW: 0.63–0.73; HL: 0.76–0.813; EL: 0.18–0.21; SL: 0.95– 1.04; PW: 0.45–0.51; WL: 0.976–1.12; GL: 1.04–1.35
Indices: CI: 84–90; REL: 22–26; SI: 142–151
Overall dark reddish-brown, with slightly lighter mandibles and antennae; trochanters, mesocoxae, and metacoxae yellowish to whitish; cuticle shining, with head, mesonotum (extending to mesopleuron), metanotal area, and propodeum rugulose. Posterior margin of head with rounded posterolateral corners, slightly emarginate medially. Scapes surpass posterior margin by about length of the first 3–3.5 funicular segments; scapes extremely setose, with erect macrosetae of varying lengths and a layer of decumbent pubescence (SMC = 45–60). Mesosoma with erect setae of varying lengths (PMC = 3–7; MMC = 2–4); in profile, pronotum elongate, with a linear rise towards mesonotum; metanotal area elongate; dorsal face of propodeum dome-like, slightly higher to even with the mesonotum; dorsal face and declivitous face about the same length; propodeum with scattered short appressed to decumbent pubescence. Gaster shining, with abundant erect macrosetae.
QUEEN. Measurements (n = 1): TL: 5.1; HW: 1.0; HL: 0.99; EL: 0.34; SL: 1.2; PW: 1.3; WL: 1.7; GL: 2.4 Indices: CI: 101; REL: 51; SI: 115
As in worker, with modifications expected for caste; darker reddish-brown than worker. Body shining with pubescence concentrated on dorsum; eyes large (taking up more than half of lateral margin), strongly convex; (PMC = 1); (MMC = 3).
MALE. Measurements (n = 3): TL: 2.9–3.0; HW: 0.68–0.72; HL: 0.64–0.66; EL: 0.32–0.33; SL: 0.87–0.95; PW: 0.78–0.82; WL: 1.0–1.3; GL: 1.1–1.2
Indices: CI: 105–111; REL: 126–138; SI: 17–19
Overall dark reddish-brown, with lighter brown funiculi, mandibles, and anterior clypeus; mesocoxae, metacoxae, mesotrochanter, metatrochanter, and tarsi white to very light yellow, with yellow protrochanter and joints of legs; cuticle smooth and shining, and covered with a dense pubescence except along mesopleuron and propodeum. Head with largely suberect macrosetae and a dense layer of pubescence. Compound eyes large (taking up most of lateral margin), ocelli large and raised. Scapes surpass posterior margin by about length of first 3–4 funicular segments; scapes with scatted erect macrosetae (SMC = 10–16) and dense layer of pubescence. Mandibular masticatory margin with prominent apical tooth and a smaller subapical tooth; basal margin rounded, but distinct. Mesosoma with dense pubescence and scattered erect setae (PMC = 0; MMC = 7–10) dorsally; declivity below level of mesonotum, smooth and shining; gaster with dense pubescence and scattered, erect macrosetae of varying heights. Genitalia (figs. 101–103): parameres roughly triangular in lateral view curving dorsally; dorsal margin of parameres directed outward from penis valves; cuspi elongated, apices rounded with peg-like teeth on ental surface where they meet digit; digiti apices broad; peg-like teeth at apices dorsally, ventrally coming to a narrow point that curves towards parameres.
Etymology. The specific epithet silvula (L. = forest) is in reference to the type locality of this species in the Kakamega Forest, one of the last remnants of indigenous forest in the region.
Non-type material examined. KENYA: Kakamega District; Kakamega Forest: Isecheno; 0.02° N, 34.97° E; 1800 m; 17 Oct 1999 (coll. R.R. Snelling); Kakamega District; Kakamega Forest: Isecheno; 0.02° N, 34.97° E; 1800 m; 21 April 2001
Notes. In addition to being one of the largest Afrotropical Nylanderia, the cuticular coloration of this species is unique. Interestingly, despite the difference (such as in color, overall size, shape of propodeum, etc.) in the appearance of the workers, the male digiti and cuspi are similar to those of N. boltoni, N. lepida, and N. natalensis.
description: Published as part of Lapolla, John S., Hawkes, Peter G. & Fisher, Brian L., 2011, Monograph of Nylanderia (Hymenoptera: Formicidae) of the World, Part I: Nylanderia in the Afrotropics, pp. 10-36 in Zootaxa 3110 on pages 23-24, DOI: 10.5281/zenodo.279290