Stolonis scortensis 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 : 9-11

Stolonis scortensis Will , new species

( Figs. 2 B, 3E–H)

Type Material. HOLOTYPE: ɗ ( EMEC), dissected genitalia in vial, portions of the abdomen and a single hind leg stored in ethanol separate from point mounted body and genitalia. Labelled: “ ECUADOR: SUCUMBIOS: Reserva Faunistica Cuyabeno, Nuevo Mundo cabins along Rio Cuyabeno at jcn with Lago Agrio–Tipishca HWY 19–29.iv.1994 W. Maddison #WPM 94­021”/ “ EMEC 1004673”. Ethanol stored portion additionally labeled "kww38".

Etymology. Specific epithet formed by the junction of two Latin words, scorteus, ­a, ­ um, "leather" and ensis, ­is, m "sword" and refers to the leathery rugosities of the male median lobe.

Diagnosis. Differs from other Stolonis species by the combination of broad pronotum with narrowly expanded lateral margins, low rounded, but produced, angular process at the hind setae ( Fig. 2 B) and immaculate elytra. The laterally wrinkled median lobe of the aedeagus is diagnostic for males ( Figs. 3 E–H).

Description. Length 5.9mm. Dorsal surface black, shiny, lightly iridescent; antennomeres 1–3 brunneous, 4–6, base of 7 and 11 black, apex of 7 and 8–10 white; mouth parts brunneous and legs flavotestaceous with coxae darker, concolorous with ventral surface.

Form of head average build; eyes moderately prominent; frontal impressions not well marked, very short, punctiform, frons between eyes shiny, scarcely iridescent near base, microlines not evident.

Pronotum ( Fig. 2 B); clearly broader than long; narrowly constricted at base; anterior submarginal sulcus deep and complete; basal impressions short broad and not clearly defined apically; lateral margins broadly rounded and moderately explanate, of almost equal width throughout; low rounded, but produced, angular process at hind setae; base punctate between and in basal impressions. Elytra elongate oval, length 3.5mm, overall width 2.3mm, slightly convex, rounded and notably sinuate near apex; humeri sloped and rounded; striae densely, shallowly punctate; intervals broad, slightly convex, shallowly crenulate. Legs, moderately slender; meso­ and metatarsi with evident, but shallow, external sulcus; fifth tarsomeres ventrally glabrous. Ventral surface shiny, clearly iridescent; mesosternum with 7 small, shallow punctures; metasternum laterally with 7 shallow, very small punctures.

Base of abdominal sternum II with row of shallowly impressed punctures; metepisternum longer than wide (l/w= 1.5); base of sterna IV–VII with band of dull, coarse irregular microsculpture; sterna IV–VI with one pair paramedial setae; in male one pair paramedial setae on VII. Aedeagus ( Figs. 3 E–H) with median lobe stout, small narrowed and blunt tip, slightly reflexed ventrally, ostium dorsal and very large; ventral surface broadly membranous medially; median lobe laterally irregularly strigate; endophallus in repose with 4 spines near apex, 2 subapical spines, and two spines located medially, arranged as in figures 3E–H. Females unknown so reproductive tract unstudied. Pygidial gland reservoir form simple with no additional lobes, chemical compounds produced unknown.

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.