Carvalhoma ovatum sp. nov.

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Figs 1, 3, 8, 11

Diagnosis

Recognized by the following characters: pronotum and hemelytra matte and shagreened (Fig. 1); punctures on hemelytron shallow, mixed with wrinkles (Fig. 3E); small and ovate body in male (Fig. 1), 1.75 in length and 3.5× longer than pronotum width; pronotum laterally smooth, without wrinkles or dense setae; parameres with hook-shaped apices (Fig. 3A).

Etymology

The species is named for the oval body of males, whereas males of other species have an elongate body; from the Latin “ovatus”, meaning “oval”.

Material examined

Holotype

AUSTRALIA: Ƌ, Western Australia, Darlington, 31.92036 ° S, 116.07842 ° E, 137 m, 5 Sep. 1962, E.S. Ross and D.Q. Cavagnaro (00043323) (CAS).

Description

Male

BODY LENGTH. 1.75.

COLOURATION (Fig. 1). Mostly dark brown to black, hind tibia apically and tarsi pale brown.

SURFACE AND VESTITURE. Body mostly matte and shagreened; pronotum laterally not wrinkled (Fig. 3A); pronotum laterally and pleura almost entirely clothed with short setae (Fig. 3G); dorsum clothed with very short setae only, few dark suberect setae present on head and pronotum (Fig. 3B, E, H); appendages and abdomen clothed with suberect or adpressed dark setae shorter than width of antennal segment II (Fig. 3D, F, I).

STRUCTURE AND MEASUREMENTS. Body ca 3.5× longer than pronotum width; frons only slightly protruding anteriad of eyes in dorsal view (Figs 1, 3B); head ca 2.4× wider than long, vertex ca 1.3× wider than eye diameter; in anterior view head ca 1.1× wider than high; antennal segment I ca 1.5× longer than vertex width, segment II ca 3.7× longer than vertex width, and ca 2.5× longer than segment I; labial segments I and II subequal in length, segments III and IV each shorter than segment II, subequal in length to each other; pronotum ca 1.6× wider than long, ca 0.9× wider than head, with single oval depression medially; metepimeron with shallow but distinct ridge (Fig. 3G).

GENITALIA (Fig. 8). Right paramere with ridge dorsally, hook-shaped apically, its outer margin concave (Fig. 8D); left paramere with angulate basal swelling and hook-shaped apex, without dorsal ridge (Fig. 8E). Theca mostly sclerotised, endosoma with large sclerite, placed ventrally, smaller sclerite placed dorsally, and sclerotised area placed dorsally near base of endosoma in repose; membrane near base of endosoma thick, with small tubercles (Fig. 8 A–B).

Female

Unknown.

Distribution

Known only from the type locality, Darlington, southwestern part of Western Australia (Fig. 11).

Remarks

Carvalhoma ovatum sp. nov. is distinguished by its oval male and shagreened hemelytron with shallow punctures, and it is not similar to congenerics.