Dyscolus osseus, Traces, 2024

Dyscolus osseus sp. nov.

(Fig. 6)

ZooBank: https://zoobank.org/ 3EFAF719-F37E-47E8-8ED0-09FAFA775C46

Holotype, ♂, Ecuador, Provincia Cotopaxi, Las Pampas , XI.1988, G. Onore leg. ( QCAZ).

Paratypes ( 3 ♂, 7 ♀)

b

c

- 1 ♂, 1 ♀, Ecuador, Provincia Cotopaxi, Otonga , 2000 m, 7.VII.1998, I. Tapia leg. (photo 1: male tibias tordus) ( QCAZ) ;

- 1 ♂, 1 ♀, Ecuador, Provincia Cotopaxi, Otonga , 2000 m, 79°05’W, 0°27’S, 2.V.1997, C. Pérez leg. ( QCAZ, CPM) (photo 2) GoogleMaps ;

- 1 ♀, Ecuador, Provincia Cotopaxi, Las Pampas , XII.1984, G. Onore leg. ( QCAZ) ;

- 1 ♀, Ecuador, Provincia Cotopaxi, Otonga , 1950 m, berge de ruisseau, 3-5.VII.2001, P.Moret leg. ( CPM) ;

- 1 ♂, Ecuador, Provincia Cotopaxi, Otonga Nature Reserve , 1800-2200 m, 9.VII.2023, G.Allegro leg. ( CGA) ;

- 1 ♀, Ecuador, Provincia Pichincha, Río Guajalito , 1200 m, 1.XII.1996, F. Guamán leg. ( QCAZ) ;

- 1 ♀, Ecuador, Provincia Pichincha, Palmeras , 1800m, 26.X.1991, T. Santanderleg. ( CPM) ;

- 1 ♀, Ecuador, Provincia Pichincha, Palmeras , 1800 m, 24.XI.1992, D.Sánchezleg. ( CPM) .

Diagnostic combination. – Wingless; pronotum oval, lacking the basal pair of lateral setae; elytral third interval asetose or with only one subapical seta; fourth metatarsomere longly bilobed, without subapical dorsolateral setae, the outer lobe twice as long as the inner lobe; endophallus with two sclerotized, squamose dorsal lobes. This combination of characters is unique among the species of Dyscolus known to us.

Description

Habitus . – Fig. 6a. Wingless. Body length: 9.9-11.9 mm.

Colour. – Body surface smooth, moderately shiny; head and pronotum piceous-black, elytra dark brown; femora dark brown with reddish brown apices; tibiae, tarsi and antennomeres 1-3 reddish brown; palpi and antennomeres 5-11 flavotestaceous.

Fig. 5. Dyscolus fabrefactus sp. nov.

a -c. Paratype, ♂, Otonga , Ecuador a. Habitus. b-c. Aedeagus. b. Lateral. c. Ventral .

d. Paratype, ♀, Calacalí, Ecuador, last visible ventrite and gonocoxites.

Microsculpture, mesh pattern. – Head: slightly transverse, faintly impressed; pronotum: slightly transverse; elytra: narrow transverse meshes.

Head. – Moderately convex, with a broad vertex between the eyes, collar constriction dorsally distinct. Eyes bulging, genae slightly convex, oblique, shorter than eyes. Mandibles robust, moderately long. Mentum tooth simple and acute. Antennae longer than half of the body length, as long as the elytra.

Prothorax. – Pronotum large, convex, oval-shaped, transverse (PL/PW = 0.9), with a narrow base. Sides slightly and briefly sinuate posterad, hind angles obtuse and blunt; lateral margin broad, strongly reflexed; anterior angles broadly rounded. Laterobasal depressions moderately deep, not punctate; basal bead almost complete, apical bead only visible laterally. Anterior pair of lateral setae present, basal pair absent. Prosternal process narrow with rounded lateral edges, not bordered.

Elytra. –Subparallel, tightly locked together, narrow at base, humeri rounded. Striae deeply impressed, not punctate; third interval asetose or with one subapical seta; intervals strongly convex, subcarinate in a few cases. Subapical sinuation weak; apex separately triangular with an acute apical spine. Umbilicate series comprising 20 to 23 setiferous punctures.

Abdomen. – Last visible abdominal ventrite conspicuously emarginate in males, very weakly emarginate in females, with one pair ( ♂) or two pairs ( ♀) of setae along its apical margin.

Legs. – Long and slender. Metafemora without anterior and posterior setae. Dorsal face of all tarsi convex, externally sulcate on tarsomeres 1-3, internally weaklysulcateonlyon tarsomere 1;fourth metatarsomere without subapical dorsolateral setae, apical lobes almost parallel, the outer lobe twice as long as the inner lobe. Fifth tarsomeres asetose ventrally.

Male genitalia. – Fig. 6b-c. Median lobe long, feebly arcuate; apex acuminate with a blunt tip.Endophallus with two sclerotized,squamose dorsal lobes.

Female genitalia. –Gonocoxite2elongate,almoststraight, with3ensiform setae on the outer ridge. Bursa copulatrix elongate, with a dorsal pouch and a slightly sclerotized dorsal area, almost semi-circular in shape. A small diverticulum precedes the spermatheca near the base of the seminal canal.

Remarks. – Most specimens have the pronotal rugosities and the elytral striae filled with a hardened earthy crust, similar to the “environmental varnish” described for some Glyptolenus species ( Will & Liebherr 2002).