Stolonis yasuni Will

Will, Kipling W., 2005, The Neotropical genera Oxycrepis Reiche and Stolonis Motschulsky: a taxonomic review, key to the described species and description of new Stolonis species from Ecuador (Coleoptera: Carabidae: Loxandrini), Zootaxa 1049, pp. 1-17 : 13-15

Stolonis yasuni Will , new species

( Figs. 2 D, 3M–P, 4B)

Type Material: HOLOTYPE: ɗ ( EMEC) genitalia dissected. Labeled: "00°40'36S"/ 76°24'02"W, ECUADOR,Napo Prov., Yasuni Scientific Station, 19:IV: 1998, 210m. Col.K.Will" /[red label]" Stolonis yasuni, K.Will "/ "U.C.Berkeley EMEC 1003668". ALLOTYPE: Ψ ( EMEC), same data and deposition as holotype except database number, " EMEC 1003669". PARATYPES: Ecuador: Orellana Prov.: Yasuni Scientific Station: 1Ψ same data as holotype except database number EMEC 1003680; 1ɗ and 1Ψ ( QCAZ), same data as holotype except database numbers, EMEC 1003670, EMEC 1003671.

Etymology. Name is a noun in apposition of the name of the type locality, Yasuni Scientific Station, Orellana Province, Ecuador.

Diagnosis. Differs from other Stolonis species by the combination of broad pronotum ( Fig. 2 D) with broadly expanded lateral margins, immaculate elytra and basally crenulate and apically nearly smooth elytral intervals.

Description. Length 7.4mm (7.0– 7.5mm). Dorsal surface deep black, shiny, lightly iridescent; antennomeres 1–3 brunneous; 4–6 and 11 black, 7–10 white; mouth parts brunneous and legs flavotestaceous with coxae and ventral region of femora infuscated.

Form of head average build; eyes moderately prominent; slightly constricted behind eyes; frontal impressions distinct, shallow, rectangular, short, length less than half distance from base of clypeus to anterior supraorbital setae; frons between eyes shiny, scarcely iridescent near base, microlines not evident.

Pronotum ( Fig. 2 D); clearly broader than long; narrowly constricted at base; anterior submarginal sulcus deep and complete; basal impressions of moderate length, 1/3 length of pronotum or less, very shallow apically, divergent apically when evident; lateral margins broadly rounded and widely explanate, constricted just apicad hind setae; not evident basad hind setae; no angular process at hind setae; shallowly punctate over base and in basal impressions. Elytra, elongate oval, length 4.3mm, overall width 2.8mm; slightly convex, rounded and notably sinuate near apex; humeri sloped and rounded; striae shallowly and broadly punctate, punctures less evident to impunctate apically; intervals, broad, slightly convex, clearly crenulate in basal half and laterally, not or very superficially crenulate apical of discal setae on interval 3. Legs, slender; meso­ and metatarsi with prominent external sulcus; fifth tarsomeres ventrally glabrous or with few very small setae. Ventral surface shiny, clearly iridescent; mesosternum with 8–10 deep, broad punctures; metasternum laterally with 6–8 deep broad punctures; metepisternum with medial sulcus very deeply impressed, slightly punctate, slightly longer than wide (l/ w= 1.3).

Base of abdominal sternum II with row of dense, moderately deeply impressed punctures; base of sterna IV–VII with dull band of coarse irregular microsculpture, more extensive on VII; sterna IV–VI with one pair paramedial setae; in male one pair paramedial setae on VII, female with two pairs. Aedeagus ( Figs. 3 M–P) with median lobe simply rounded at tip, ostium dorsal and large; ventral surface well sclerotized; in repose endophallus with clearly defined scale field field near apex, left of midline and two spines located at 1/2 length of median lobe. Female reproductive tract ( Fig. 4 B) with elongate, right dorsolateral bursal pouch, smaller expanded region subtending the broadly connected spermatheca and common oviduct; gland connected by a short duct to the subspermathecal pouch; laterotergites IX with scattered setae; gonocoxite­1 with 5–7 apical setae; gonocoxite 2 with 2 lateral ensiform setae, 1 apical nematiform setae.

Pygidial gland form simple, no extra lobes, chemical compounds produced: formic and acetic acids, 2­pentadecanone and C10:0, C11:0 hydrocarbons (as species number EC199802 O in Will et al. 2000).

Natural history and collecting information. Night active in very wet areas of primary forest. Taken treading vegetation in muddy areas and near fallen Ficus and palm plants. Collected with S. catenarius and S. spinosus . The first two larval instars were reared for this species in the laboratory. Six pigmented stemmata are present in the active larva.

Figures

FIGURE 2. Pronota of: A— Stolonis tapiai, B— Stolonis scortensis, C— Stolonis spinosus, D— Stolonis yasuni, E— Stolonis catenarius.

FIGURE 3. Aedeagus dorsal, left lateral, right lateral and ventral views of: A – D— Stolonis tapiai, E – H— Stolonis scortensis, I – L— Stolonis spinosus, M – P— Stolonis yasuni, Q – T— Stolonis catenarius.

FIGURE 4. Female reproductive tract, ventral views of: A— Stolonis tapiai, B— Stolonis yasuni. bc, bursa copulatrix. bs, bursal sclerites. co, common oviduct. gx 1, gonocoxite­ 1. gx 2, gonocoxite­ 2. lt, laterotergite IX. sg, spermathecal gland. sp, spermatheca.