Gorhamium unidentatum, Nascimento & Bocakova, 2024

Nascimento, Elynton Alves & Bocakova, Milada, 2024, Phylogenetic analysis reveals a new net-winged beetle genus of Eurrhacini (Coleoptera, Lycidae) from the Pacific slopes of Central America and Ecuador, ZooKeys 1204, pp. 241-259 : 241-259

Gorhamium unidentatum sp. nov.

Figs 2 C , 3 B , 4 C , 5 E – H , 6 F, G

Type material.

Holotype • male, “ Ecuador, 50 km SW Quito, San Francisco de las Pampas , Otonga res., 1500 m, 0 ° 25 ' S, 79 ° 00 ' W, 5–6. Dec 2010, Bolm lgt. “ ( UPOL).

Diagnosis.

Pronotum black. Elytra bicolor orange-black with suture, longitudinal median oval spot, and triangular apical spot black. Phallus ball-shaped apically, ventromedial opening widest in basal third. Apex of each paramere fitted with a sharp laterally projected tooth, internal sac with a series of diminutive teeth (e, Fig. 6 G ).

Description.

Body length: 6.4 mm, width across the humeri: 1.2 mm. Body black, only elytral sidebars orange (with whole suture, longitudinal median oval spot and triangular spot in apical quarter black, remaining sidebars orange (Fig. 2 C ). Head mostly hidden by pronotum in dorsal view. Elytra slender, 4.5 × longer than humeral width (Fig. 2 C ); primary costae 2 and 4 and basal 1 / 5 of primary costa 3 elevated; reticulate cells oval, strongly irregular, secondary costae 3 and 4 diminishing apically.

Male. Eyes medium-sized, interocular distance 1.3 × longer than eye diameter (Fig. 3 B ). Antennae with antennomere 3 (= A 3) 1.3 × shorter than A 4, A 4 – A 10 subequal in length; antennal branches flattened, considerably lengthening medially, A 3 lamella 1.2 × longer than antennomere A 3 length, A 4 lamella 1.35 × longer than A 4 length, A 5 lamella 1.5 × longer than A 5 length (Fig. 4 C ). Abdominal sternum VIII widely emarginated in distal third (Fig. 5 F ), its proximal margin almost straight. Tergum X elongate, 1.7 × longer than sternum IX on the sides (Fig. 5 E ). Phallus bent ventrally in distal 1 / 3, constricted subapically, apex ball-shaped; ventromedial opening widest in basal quarter (b, Fig. 6 G ); dorsal hook shifted in distal quarter (c, Fig. 6 G ). Parameres as long as 2 / 3 of phallus, with a single, laterally projected, apical tooth; ventrobasal parameral protrusions slender, joined medially in a ring-like bridge (d 3, Fig. 6 G ).

Female. Unknown.

Etymology.

The specific name refers to the single sharp tooth at the apex of each paramere.

Distribution.

Ecuador.

Figures

Figure 2. Habitus, dorsal view A, B Gorhamium bidentatum sp. nov. A male B female C Gorhamium unidentatum sp. nov., male.

Figure 3. Pronotum A Gorhamium bidentatum sp. nov., male B Gorhamium unidentatum sp. nov., male.

Figure 4. A head ventrally B, C antenna dorsally A, B Gorhamium bidentatum sp. nov., male C Gorhamium unidentatum sp. nov., male.

Figure 5. Terminal abdominal segments A – D Gorhamium bidentatum sp. nov. E – H Gorhamium unidentatum sp. nov., male G Cladocalon chiriquense (Gorham, 1884) A, B, E, G male terminalia (sternum IX and tergum IX – X), A – ventral view; B, E, G – dorsal view C Male sternum and tergum VIII, ventral view D female terminal sternum, ventral view. F, Male sternum VIII, ventral view H Male tergum VIII, dorsal view.

Figure 6. A – G, Male genitalia A, B Cladocalon chiriquense (Gorham, 1884) C – E Gorhamium bidentatum sp. nov. F – H Gorhamium unidentatum sp. nov. H female genitalia of Gorhamium bidentatum sp. nov., ventral view. A, C, F ventral view B, D, G lateral view E ventrolateral view. Abbreviations: a 1 – pointed anchor-shaped base of phallus, a 2 – flat anchor-shaped base of phallus, b – phallic ventral opening, c – dorsal dent, d 1 – arcuate ventrobasal parameral process, d 2 – flattened ventrobasal parameral process, d 3 – a ring-like ventral bridge (ventrobasal processes medially fused), e – internal sac.