Passalus (Pertinax) striatissimus Luederwaldt, 1934

Jiménez-Ferbans, Larry, Reyes-Castillo, Pedro & Bevilaqua, Marcus, 2022, The Brachypterous Species of Passalus (Pertinax) (Coleoptera: Passalidae), with the Description of a New Species from Sierra Nevada de Santa Marta, Colombia, Neotropical Entomology 51 (5), pp. 722-741 : 733-734

Passalus (Pertinax) striatissimus Luederwaldt, 1934

( Fig. 10 )

Type material. Cotipo: sex. male. Brazil. [Rio de Janeiro] Itatiaya — 160 m / Macieiras / 19.vii.1933 / J.F. Zikán // Passalus striatissimus Lüederw. / Lüederwaldt. 33 // 06,510 ( MZUSP) .

Diagnosis: Frons anterior edge straight or slightly convex, without middle indentation; frontal area fully punctuated on anterior region; mediofrontal + laterofrontal tubercles smaller than inner tubercles; posterior frontal ridges strong, high, starting transversely at the base of the central tubercle; mesosternal scars large, narrow, and shallow, with an opaque surface; metasternum posteriorly bounded by a large group of thick punctures over the lateroposterior region; epipleura glabrous; humeri with short tuft of setae.

Redescription.

Habitus ( Figs. 10 a-c): total length 30 to 31 mm, brachypterous, body convex.

Head ( Figs. 10b,d ): labrum with anterior border straight. Clypeus hidden below the frons, anterior angles small and acute, positioned below the mediofrontal+ laterofrontal tubercles. Frons anterior edge straight or slightly convex, without middle indentation, without secondary mediofrontal tubercles. Mediofrontal + laterofrontal tubercles small, conspicuous, projected forward with acute apex. Frontal area transverse, twice wider than long, sloping, with the tegument of the anterior region full of thick punctuations and smooth posterior area. Inner tubercles large, conspicuous with slightly obtuse vertices, larger than mediofrontal + laterofrontal tubercles, from which they are separated, but located closer to them than to the central tubercle. Anterior frontal ridges absent. Posterior frontal ridges strong, high, starting transversely at the base of the central tubercle. Cephalic mamelon small, inconspicuous, slightly triangular in shape and not divided by a longitudinal groove. Central tubercle conical, not flat, tall, with apex no free. Lateroposterior tubercles small, conspicuous, located far from the central tubercle, without a keel connecting them. Lateropostfrontal area deep, with smooth surface. Postfrontal groove well-marked, with notch in the middle region. Anterior head angles well-developed, with acute vertices, larger than mediofrontal+ laterofrontal tubercles. Canthus ocular narrow, apex straight or slightly rounded, almost reaching the middle of the eye (eyes reduced). Hypostomal process wide, glabrous, and distant from the mentum. Medial basal mentum slightly dilated, without setigerous punctuations; with protruded anterior region and middle notched. Lateral fossae of the mentum oval, open, large, deep, without punctures or setae. Antennal club trilamellate, with short, robust, and straight lamellae. Mandibles with incisor lobe with three well-formed teeth at the apex; robust upper internal tooth with a larger superior tubercle than the lower one; large and tall dorsal teeth, directed forward; inconspicuous infrabasal fossae. Maxilla with lacinia bidentate at the apex. Ligula tridentate with medium tooth slightly larger and with the same width as the lateral teeth.

Thorax ( Fig 10 ): pronotum same wide of elytra, anterior border slight concave; anterior angles straight. Marginal groove narrow, occupying ½ of the anterior margin of the pronotum, containing fine punctuations in the anterior and lateral region. Lateral fossae large, well-marked, deep, irregular in shape, with scarce punctures (less than 5). Prepimerum with sparse pubescence, mainly in the posterior region. Prosternelum rhomboidal, with a constriction close to the base, which is truncated. Mesosternum smooth and glabrous, with the tegument of the lateral areas opaque. Mesosternal scars large, narrow, and shallow, with an opaque surface, without punctures or setae. Posterior corner of the mesepisternum and mesepimere glabrous. Anterolateral part of metasternum and lateral fossa glabrous. Metasternal disc without punctures, posteriorly bounded by a carina formed by a large group of thick punctures over the lateroposterior region. Metasternal lateral fossae glabrous, narrow, not dilated at the apex; narrower than mesotibia.

Elytra ( Figs. 10a, b, c ): epipleura glabrous. Humeri with short tuft of setae. Striae narrower than interstriae; marked with rounded, deep and conspicuous punctures on the dorsal and lateral striae.

Abdomen ( Fig. 10b ): Last sternite with marginal groove incomplete and well-marked.

Legs ( Figs. 10a, b, c ): profemur with ventral anterior marginal sulcus marked and complete. Protibiae not dilated. Mesotibiae with two or three small spines on the outer margin. Metatibiae without spines on the outer surface.

Aedeagus elongated ( Figs. 10a, b ). Basal piece distinctly separated from the parameres. Median lobe practically the same width as the basal piece and the parameres; in ventral view with two large plaques, very sclerotized. Parameres in ventral view with a recess in the median region in a “V” shape; transverse anterior margin; in side view with apexes of the narrow projections not reaching half the length of median lobe; in dorsal view projections not joined.

Figures

Fig.10 Passalus (Pertinax) striatissimus: (a) dorsal habitus; (b) ventral habitus; (c) lateral habitus; (d) head and anterior part of pronotum