Nuvol umbrosus Navas , 1916

Sosa-Duque, Francisco Jose & Tauber, Catherine A., 2023, Discovery and redescription of the true Nuvol umbrosus Navas and naming of a new Nuvol species (Neuroptera, Chrysopidae, Leucochrysini), ZooKeys 1158, pp. 179-193 : 179

publication ID	https://dx.doi.org/10.3897/zookeys.1158.98572
publication LSID	lsid:zoobank.org:pub:131896B5-5657-4579-9633-4476D9730A32
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scientific name	Nuvol umbrosus Navas , 1916
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Treatment

Nuvol umbrosus Navas, 1916 View in CoL

Nuvol umbrosus Brotéria ( Zoológica) 14: 25; "Rio de Janeiro, Febrero de 1912" (only one specimen). Navás 1929a: 860 (locality record, as Newol [sic] umbrosus); Navás 1929b: 319 (locality record); Penny 1977: 28 (species list); Brooks and Barnard 1990: 251 (taxonomy, drawing of wings from Adams’ notes on MZUSP specimen); Oswald 2013 (catalog listing); Tauber and Sosa 2015: 141-153 (taxonomic treatment based on incorrect species identification).

Redescription.

One male specimen preserved in alcohol, examined by FS: "MG, São Gonzalo Rio Abaixo, EA [ Estação Ambiental, 19°53'2.86"S, 43°22'26.14"W, 751m] Peti, 30.iv.2012, A. F. Kumagai" (deposited in the collection of the Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais (ICB - UFMG), Belo Horizonte, Brazil).

Body (Fig. 1 View Figure 1 ): Slender, yellowish to greenish, with elongate, slender antennae (both broken), hyaline wings marked with conspicuous brown to golden bands. Head (Figs 1A View Figure 1 , 2A-C View Figure 2 ): Vertex raised, yellowish green, with two wide, reddish-brown longitudinal stripes dorsally, two smaller stripes laterally near edge of eyes. Frons, clypeus greenish; genae red. Labial, maxillary palpi yellow, unmarked. Antennae with scapes elongate, relatively large, close to each other mesally, cream colored, with light reddish-brown stripe dorsally (Fig. 2A, B View Figure 2 ); pedicel apparently unmarked; flagellar segments (basal section of flagellum) elongate, each with four swirls of robust, acute black setae (Fig. 1B View Figure 1 ). Measurements: head width (dorsal) 1.7 mm, ratio of head width / eye width 1:2.2; scape length 0.46 mm, width 0.35 mm.

Thorax (Fig. 2A, C, D View Figure 2 ): Prothorax slightly wider than long (length 0.9 mm, width 1.2 mm), notum with five thin, longitudinal, reddish-brown stripes, three dorsal [as illustrated by Navás (1916)], two on lateral margin [absent from Navás’ drawing]; surface with elongate, golden setae mesolaterally. Mesothorax, metathorax with dark red marks laterally. Legs pale, without markings, with numerous light-brown to amber setae; tarsal claws with broad, dilated base, deep narrow cleft (Fig. 1C View Figure 1 ).

Note: Navás’ figure illustrated only the dorsal marks on the pronotum, not the lateral stripes; however, he explicitly mentioned the lateral stripes in his description. Thus, the specimen we describe here matches Navás’ type specimen in having five distinct dark red longitudinal stripes on the pronotum and two thin, somewhat diffuse, lateral stripes on the mesonotum and metanotum.

Wings (Fig. 3 View Figure 3 ): Forewing 17.0 mm long, 6.1 mm wide (at widest point), with ratio of length / maximum width = 2.8:1; width at midpoint 5.6 mm, width along distal margin of basal quadrant, 4.2 mm; at base of distal quadrant 5.7 mm. Costal area relatively narrow; tallest costal cell (#8) 0.9 mm tall, with height 1.5 times its width, 0.16 times width of wing (midwing). First intramedian cell (im1) triangular, height at base (along median arculus, ma) 0.46 mm, width 2.1 times height, 0.57 times width of third median cell (m3). First radial crossvein distal to origin of radial sector (Rs); radial area (between R and Rs) with single row of 14 short, closed cells; tallest radial cell (ra-rp1) 0.69 mm in height, 0.72 times shorter than its width; two b cells (cells beneath Rs, not including an inner gradate vein); eight b ' cells (cells beneath Psm, after im2). Nine discrete inner gradates in regularly ascending, almost linear pattern, basal one not reaching Psm. Nine to eleven outer gradates aligned in relatively straight line adjacent to margin of wing, from tip of Psm to tip of Rs. Height of fourth inner gradate cell 1.1 times width. Four intracubital cells (icu1-icu3 closed, icu4 open). Subcosta, radial sector forked apically; thirteen to fourteen posterior terminal veins forked, distal six simple, without forks. Longitudinal veins, crossveins simple, slender, largely without crassate sections. Alar membrane with three large, conspicuous, diffuse, light yellowish-brown marks; stigma brown marked (Fig. 3B View Figure 3 ). Most veins dark, those beneath diffused alar markings appearing hyaline.

Hindwing 15.8 mm long, 5.1 mm wide. Nine discrete inner gradates, basal one not reaching Psm. Six outer gradates ascending in relatively straight to slightly zigzag trajectory adjacent to wing margin. Thirteen radial cells (counted from origin of radius, not false origin). Two large b cells (no small " t " cell); seven b ' cells beyond im2. Membrane with yellowish-brown diffused marks, similar to those on forewing; veins generally dark, but light in areas of diffused markings; stigma with single, weak brown spot basally, brown veins.

Abdomen, male (Figs 4 View Figure 4 - 6 View Figure 6 ): Yellowish with dark brown to black spots on tergites, sternites as follows: posterior sections of T1-T3, T6-T7, lateral margins of T1-T7, along dorsal apodeme below T8, tip of T9+ect, dorsal margin of S9 (Fig. 4A-C View Figure 4 ). Tergites, sternites quadrate, with all margins relatively straight, with long, robust setae, scattered short setae, dense microsetae, except S9 without microsetae (Fig. 5E View Figure 5 ); pleuron with sparse short setae except P7, P8 with setae large, dense. Microtrichiae covering the pleuron throughout. Spiracles small, round externally, atria not enlarged; rim sclerotized weakly. Callus cerci brown to black, round to slightly oval, located medially on T9+ect, with ~32 densely spaced trichobothria (Figs 4C View Figure 4 , 5D View Figure 5 ). T9+ect fused dorsally, elongate, extending basally beneath T8 to distal margin of T7, with dorsal apodeme extending along full length of ventral margin, articulating basally with proximal end of ventral apodeme on dorsal margin of S8+9. Dorsal apodeme (Fig. 5A View Figure 5 ) strongly sclerotized throughout, bifurcated mesally, proximal to callus cerci, with dorsal spur almost reaching the dorsal margin of T9+ect, with lower section extending distally into setose lobe, well beyond distal margin of T9+ect (Fig. 5A-C View Figure 5 ). Basal section of S8+9 connected to T9+ect via membrane with scattered, long setae (Figs 4B, C View Figure 4 , 5A View Figure 5 ). Dorsal margin of S8+9 (lateral view) with deep mesal cleft (Figs 4C View Figure 4 , 5A View Figure 5 ); ventral surface of S8+9 with small suture-like separation, S8 with microsetae, S9 without microsetae (Fig. 5A View Figure 5 ). Dorsal margin of S8 with distinct apodeme (ventral apodeme) descending abruptly to base of cleft, covered by dense field of robust setae (Fig. 5A View Figure 5 ). Dorsal margin of S9 heavily convex, with sclerotized apodeme along upper edge, with round, sclerotized tips extending beyond end of segment (Fig. 5A-C, E View Figure 5 ). Sternites with ratio of maximum height / maximum length (lateral view): S2 = 0.5:1; S3 = 0.6:1; S4 = 0.8:1; S5 = 1:1; S6 = 1:1; S7 = 1.1:1; S8 = 1.5:1; S9 = 0.6:1; surfaces without microtholi.

Gonarcus well sclerotized, widely arcuate (maximum span 0.31 mm; minimum span between posterior apices of the lateral apodemes 0.28 mm); gonarcal bridge broad, curved, bearing two long, flat, quadrate gonocornua dorsally (~0.28 mm long, 0.14 mm wide), pair of broad oval-shaped gonarcal apodemes basally (0.46 mm tall, 0.22 wide); gonarcal bridge strongly fused with base of gonocornua (Fig. 6A View Figure 6 ), pair of ventral projections (~0.24 mm long) extending from the ventral surface of the gonarcal bridge (Fig. 6B-D, F View Figure 6 ), with distal area swollen, terminating in beak-like apex (Fig. 6B, C View Figure 6 ). Mediuncus attached to gonarcal bridge and ventral processes via membranes extending from lower surface of gonarcal bridge, from inner margins of ventral processes; dorsal surface of mediuncus apparently smooth (Fig. 6B-D View Figure 6 ), terminating distally in curved beak, flanked laterally by prominent lateral lobe (Fig. 6B View Figure 6 ). Gonosaccus with dorsal surface striate (Fig. 6E View Figure 6 ), with two mesal fields of three large, heavily sclerotized chalazae, each bearing one or two long, thin setae subapically (Fig. 6F, G View Figure 6 ); area on gonosaccus above heavy chalazae with additional smaller chalazate gonosetae (Fig. 6G View Figure 6 ). Hypandrium internum not seen.

Note: The hypandrium internum can often be difficult to find. One was not found in this specimen. Either the specimen did not have one, it was not well developed, or it was lost.

Abdomen, female: Undescribed.

Immatures and biology.

Unknown.

Known geographic distribution.

Brazil: Rio de Janeiro, Minas Gerais (new record).