Stolonis spinosus 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 : 11-13

Stolonis spinosus Will , new species

( Figs. 2 C, 3I –L)

Type Material. HOLOTYPE: ɗ ( EMEC), genitalia dissected. Labeled: " 00°40'36"S 76°24'02"W, ECUADOR, Napo Prov., Yasuni Scientific Station, 22:IV: 1998, 210m. Col.K.Will, Headlamp"/ "U.C. Berkeley EMEC 1003666"/[red label] " Holotype, Stolonis spinosus, K.Will ", ALLOTYPE: Ψ, ( EMEC), genitalia dissected. Labeled same as holotype /" EMEC 1003665"/[red label] "Allotype, Stolonis spinosus, K.Will ". PARATYPES: Ecuador: Orellana Prov.: Yasuni Scientific Station: 1Ψ ( EMEC), 00°40'36"S 76°24'02"W, 22:iv:1998, Col.K.Will, Treading in palm swamp, EMEC 1003667; 3ɗɗ ( EMEC), headlamp, 210m, EMEC 1003658, EMEC 1003659, EMEC 1003660; 4ɗ EMEC 1003661 ( EMEC), EMEC 1003663 ( USNM), EMEC 1003664 ( CUIC), EMEC 1003662 ( QCAZ).

Etymology. Specific epithet is the Latin spinosus , a, um "of thorns" and refers to the many spines in the male endophallus.

Diagnosis. Differs from other Stolonis species by the combination of broad pronotum with broadly expanded lateral margins, impunctate base of the pronotum ( Fig. 2 C) and immaculate elytra. The numerous spines and their pattern in the endophallus ( Figs. 3 I–L) are diagnostic for males.

Description. Length 5.1mm (5.0– 5.5mm). Dorsal surface black, vaguely paler at apex, shiny, lightly iridescent; antennomeres 1–3 brunneous or palpi infuscated and/or apex of antenomere 3 infuscated; anternomeres 4–6 and 11 black, 7–10 white; mouth parts brunneous and legs flavotestaceous with coxae concolorous or slightly lighter than ventral surface.

Form of head average build; eyes slightly prominent; no or very slight constriction behind eyes; frontal impressions marked but not clearly delimited dorsally and medially, shallow, short, length much 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 C); clearly broader than long; narrowly constricted at base; anterior submarginal sulcus deep and complete; basal impressions short, nearly punctiform, not evident apically or only as very shallow, broad depressions, slightly divergent when evident; lateral margins broadly rounded and widely explanate, constricted just apicad hind setae; not evident basad hind setae; no angular process at the hind setae; base and basal impressions impunctate. Elytra, elongate oval, length 3.0mm, overall width 2.5mm; slightly convex, somewhat depressed in basal 1/3, form rounded and slightly sinuate near apex; humeri sloped and rounded; striae with moderately deep, small, dense punctures, somewhat less evident apically; intervals broad, nearly flat, only very slightly crenulate. Legs, slender; meso­ and metatarsi with prominent external sulcus; fifth tarsomeres ventrally glabrous. Ventral surface shiny, iridescent mesosternum with 8–10 deep, punctures; metasternum laterally with 4–6 broad, deep punctures; metepisternum with medial sulcus moderately deeply impressed, slightly longer than wide (l/w= 1.3).

Base of abdominal sternum II with very narrow row of dense, moderately deeply impressed punctures; base of sterna IV–VII without evident coarse irregular microsculpture; sterna IV–VI with one pair paramedial setae; in male one pair paramedial setae and female with two pairs on VII. Aedeagus ( Figs. 3 I–L) with median lobe bluntly rounded and slightly asymmetrical tip, ostium dorsal and large; ventral surface distinctly sclerotized; in repose endophallus with eight spines in form of ring in middle of median lobe in right lateral view, single spine closer to apex and small scale field left of midline from near apex to almost 1/4 length of median lobe, best visible in ventral view. Female reproductive tract with large, right dorsolateral bursal pouch, smaller expanded region closely subtending a more narrowed region on which the broadly connected, moderately stout and spermatheca and common oviduct connect; gland connected by a duct to base of spermatheca; laterotergites IX with scattered setae; gonocoxite­1 with 6 apical setae; gonocoxite 2 with 1–2 lateral ensiform setae, 1 apical nematiform seta. Pygidial gland reservoir form simple without additional lobes, chemical compounds produced unknown.

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. yasuni and S. catenarius .

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.