Arenivaga nocturna, Hopkins, Heidi, 2014

Hopkins, Heidi, 2014, A revision of the genus Arenivaga (Rehn) (Blattodea, Corydiidae), with descriptions of new species and key to the males of the genus, ZooKeys 384, pp. 1-256 : 89-90

Arenivaga nocturna sp. n. Figures 117-119

Type locality.

MEXICO, Baja California, Rancho Union.

Material examined.

Holotype: ♂ in SDMC labeled "Rancho Union, Baja California Mex., April 17, 1947, Charles F. Harbison Collector" "HOLOTYPE Arenivaga nocturna Hopkins, 2012" [red label with black border].

Paratypes (8): MEXICO: BC, Angeles Bay, Gulf of CA, 6/26/1921, EP Van Duzee, Arenivaga erratica Rehn det. Hebard 1922 on one specimen (2, CAS); BC, Angeles Bay, Gulf of CA, 6/26/1921, EP Van Duzee, Hebard Collection (2, ANSP); BC, Rancho Union, 4/17/1947, CF Harbison (1, SDMC); BC, Bahia de LA, 6/2/1981, Werner,Olson,Hetz,Thomas,Burne,Frank & MacLachlan (2, UAIC); Coahuila, ca. 7.2 mi. SSW of Cuatro Cienegas, 10/10/1978, C.E. Dunnr (1, ANSP). All paratypes labeled "Paratype Arenivaga nocturna Hopkins 2012" [blue label with black border].

Etymology.

The name is an adjective in the nominative singular. This species is named from the Latin meaning nocturnal or "of the evening".

Distribution.

This species is found in southeastern Baja California Norte, Mexico. See Fig. 119.

Diagnosis.

Arenivaga nocturna can be distinguished by its narrow, sweeping hook-shaped lobe on the right dorsal phallomere, as well as the broad short spine on the medioventral side of the posterior end of the medial margin of the same phallomere. See Fig. 118.

Description.

Male.Measurements. Holotype TL = 20.7 mm, GW = 9.2 mm, PW = 6.53 mm, PL = 4.61 mm, TL/GW = 2.25, PL/PW = 0.71. EW = 0.30 mm; OW = 0.50 mm. Among paratypes range of TL 17.1-21.7 mm; range of GW 8.3-9.8 mm; range of PW 5.70-6.72 mm; range of PL 4.05-4.63 mm.

Head. Two ocelli large, ovoid and protruding (0.50 × 0.35 mm); vertex medium brown, with small ridges between apices of eyes and extending onto ocellar tubercles; interocellar space concave, medium brown, with two pale round indentations, pale medially. Posterior frons light brown, concave; anterior frons light brown, bulbous; light brown anteclypeus. See Fig. 117d.

Pronotum. Pronotum translucent waxy beige; dorsal surface of pronotum covered with short orange-brown setae that are longer and thicker laterally; pronotal pattern light orange-brown "panther face"; little discernible detail; no aura. See Fig. 117c.

Body. Wing brace present. Two tarsal claws present. Legs and body medium orange-brown; subgenital plate light orange-brown, strongly asymmetrical with rounded apices. See Fig. 117b.

Forewings. Wings extended beyond abdominal apex (up to 40% of total wing length); pale golden beige with no markings to light brown with scattered medium brown blotches; surface translucent and hyaline in most specimens, though matte and opaque in some. See Fig. 117a.

Genitalia. Right dorsal phallomere composed of bulbous lightly sclerotized hook-shaped lobe, articulated with right ventral phallomere on lateral side; central field slightly sclerotized; medial margin heavily sclerotized, smooth anteriorly, becoming punctate then shagreened posteriorly, extending posteriorly into shagreened knob with short dorsally projecting spine. Small central sclerite large for this sclerite, concave, punctate with toothed patch along ventral edge. Right ventral phallomere extends from articulation to form large smooth rounded, increasingly punctate and sclerotized anteriorly; one smaller punctate ridge anteriorly, followed by moderate gap and then by long rounded concave shagreened arm extending beyond depth of rest of phallomere. Folded anterior portion of left phallomere setose, otherwise unmodified. Genital hook with moderate extension to pointed head with slight concavity on short hook; arm long, narrow, barely curved. See Fig. 118.

Habitat and natural history.

All life history elements remain unobserved.