NESTORINUS ROITMANI SP. NOV. (FIGS 3–5)

Z o o b a n k r e g i s t r a t i o n: l s i d: z o o b a n k. org:act: 44480E09-8FDB-4A56-8362-CE28335363E4

Type locality: Chile, Valparaíso region, Aconcagua province, Putaendo,estero Los Ángeles. Georeference: − 32.55°S, − 70.86°W (Fig. 1: red triangle). Distribution and habitat: Known only from the type locality, a site corresponding to the central coastal mountain range entomofaunal region (Peña, 1966) in the Coquimban biogeographical province (Morrone, 2015). This species inhabits a semi-arid environment associated with sclerophyllous forest with small freshwater streams (Fig. 1B).

Behaviour: Adults are nocturnal and can be found under logs or further up in branches of shrubs or trees (Fig. 1A). During the day they are hidden under logs or rotten branches. Immature states are usually inside decaying wood, possibly of Baccharis sp. (Asteraceae), frequently in dry or rotten wood on the river side, buried 5–20 cm down in humid sandy soil.

Diagnosis: Body elongated and black (Fig. 3A). Pronotum subrectangular with moderate punctures slightly uniform and posterior angles extended (Fig. 3B). Elytra with straight striae and interstices slightly convex and finely punctuated (Fig. 3C). Male: Parameral alae of the aedeagus wider in the base, alae separated in the apex (Fig. 3G). Female: baculi of coxite I 1.8 times as long as paraproct (Fig. 4C). Spermatheca rounded, with obtuse apex (Fig. 4D). Larva: Tergum VII with a visible sclerotized brown spot (Fig. 5D). Tergum VIII barely wrinkled and strongly punctured, and processes of tergum VIII reaching the posterior margin (Fig. 5D). Thorns of the urogomphi curved (Fig. 5A, D). Urogomphus with four secondary thorns below the main thorns (Fig. 5E).

Etymology: The species name is dedicated to Sergio Roitman, who collected the holotype.

Material examined: Holotype: Chile, Putaendo, estero Los Ángeles. 23 December 2019. Leg. S. Roitman (one ♂, MNNC).

Paratypes: Chile, Putaendo, estero Los Ángeles. 5 February 2016, leg. N. Zambrano (one ♀, MNNC; one ♀, CNZE). 13 February 2016, leg. S. Roitman (one ♀, CVMD; one ♀, PVGH; one ♀, CSRR; one ♀, MZUC). 29 December 2018, leg. M. Guerrero (one ♀, CMGG; one ♀, PVGH). 12 January 2019, leg. S. Roitman (one ♀, CSRR) . 28 December 2019, leg. N. Zambrano (one ♀, CNZE) .

Description: Shiny black body, 2.6 times longer than wide (length, 15.5 mm; width, 5.9 mm; Fig. 3A). Head with regular punctures, each one with a short seta. Clypeus with anterior margin emarginate. Suture between clypeus and frons visible, but less visible to the margins. Genae raised and wide. Eyes reniform; the distance between eyes 2.3 times the width of a single eye (Fig. 3A). Supraorbital groove deep. Antennae long, exceeding the posterior margin of the pronotum. Antennomeres slightly punctured, and each puncture with a seta. Last four antennomeres with dense pilosity forming a simple antennal club. Visible sensoria from antennomere VIII. Antennomere III smaller than IV and V together.Antennomeres V and VI similar in size. Antennomeres wider from VII to X. Antennomere XI slightly longer than wide. Pronotum slightly convex, subrectangular and widest in the middle. Pronotum surface with umbilicated punctures, thicker at margins (Fig. 3B). Pronotal disc raised, more conspicuous at the posterior half, with two slight anterior and posterior depressions close to the margins. Anterior margin sub-straight. Lateral margin thin, finely punctured and slightly curved towards the anterior half. Basal margin bisinuate, wide and strongly punctured. Anterior and posterior angles obtuse. Prosternal apophysis surpassing the posterior margin of the pronotum, slightly raised and with a visible groove between the coxae (Fig. 3D). Mesoventrite narrow; anterior part wrinkled, with a visible and shiny central carina (Fig. 3D). Superior portion and between coxae raised, shiny and slightly punctured. Metaventrite wider, smooth and shiny, punctured on the lateral margins. Scutellum visible and triangular, slightly punctured. Elytra elongated, black and shiny. Nine striae on each elytron formed of coarse punctures. Interstices slightly convex and thinly punctured (Fig. 3C). Abdomen black and shiny. Abdominal ventrites I–III very similar in size, slightly rough and finely punctured. Abdominal ventrite IV narrower than the others (1:2), finely punctured and with visible lateral margin. Abdominal ventrite V triangular, finely punctured, with margins barely visible. Visible membrane in the last two abdominal ventrites. Legs long and thin. Femora and tibiae finely punctured. Tibiae slightly arched. Internally, each tibia has a smooth, shallow carina. Each edge of the carina has a row of semierect setae. Meso- and metatibiae with semi-erect setae along margins of the medial aspect and dense pilosity in the central cleft (Fig. 3F). Tarsomeres pubescent. Aedeagus inverted, curved and simple. Parameral alae of aedeagus widest at base. Alae separated at apex (Fig. 3G).

Females: Similar to males, but larger (length, 1.2:1; width, 1.3:1; Fig. 4A). Meso- and metatibiae with sparse semi-erect setae in the margins of the medial aspect; central cleft with sparse pilosity (Fig. 4B). Ovipositor greatly elongated; membranous except for baculi (Fig. 4C). Baculi of first coxite 1.8 times as long as paraproct baculi. Lobes of coxites 2, 3 and 4 membranous and thinning towards the apex. Gonostyle long and sclerotized. Spermatheca spherical, with obtuse apex, surface densely grooved (Fig. 4D).

Larvae: Body elongate-cylindrical, yellowish (Fig. 5A). Tergum VII with a sclerotized semicircular brown spot almost completely covering the posterior margin, not reaching the anterior margin (Fig. 5D). Tergum VIII with two or three shallow but conspicuous wrinkles, strongly punctured. Processes of tergum VIII reaching the posterior margin (Fig. 5D). Thorns of urogomphi curved (Fig. 5A, D). Urogomphus with four secondary curved thorns below the main thorns (Fig. 5E).

I n t r a s p e c i f i c v a r i a t i o n: T h e t y p e s e r i e s wa s morphologically constant. Some colour variation was observed in adults, from dark brown to black.