Petrocyphon monga Watts, 2011

Zwick, Peter, 2016, Australian Marsh Beetles (Coleoptera: Scirtidae). 9. The relations of Australasian Ypsiloncyphon species to their Asian congeners, additions, mainly to Petrocyphon and Prionocyphon, and a key to Australian genera of Scirtinae, Zootaxa 4085 (2), pp. 151-198 : 166-167

Petrocyphon monga Watts, 2011

( Figs 24, 25−27 )

Material studied. 3♂, 2♀: Clyde Mtn. 24 km SE of Braidwood NSW 31 Aug. 1990 C.Reid rainforest gully ( ANIC).

The new site is in close vicinity of the type locality, Monga. The species resembles P. bonang but the front angles of pronotum project less than in P. bonang . There is a vague oblique depression behind the front third of the elytra by which the area behind and laterally from the scutellum appears slightly raised. Two of the males have their genitalia everted. In one, the components are spread, in the other the entire complex resembles a long finger standing vertically above the abdominal tip ( Fig. 24 ). The female was previously unknown.

Female ( Figs 25−27 ). Habitus similar to male, antennae slightly shorter and thinner. Abdominal segments not modified. There is a very long tubular vulvar sclerite which seems to consist of two half tubes and, in the front half, of a central piece ( Fig. 27 ). The caudal edge towards the gonopore is reinforced and of defined shape, the anterior edge towards the bursella is unmodified. The two bursal discs are oval, about 250 × 220 µm. The entire surface is covered with fairly coarse irregular meshes, there is no differently structured periphery. The disc surface is uneven, an elongate lobe hangs over a comma-shaped depression ( Figs 25, 26 ).

Note. By the strongly asymmetrical male genitalia this is a member of the messatos -group ( Zwick 2012). However, females assigned to P. bihamatus Zwick have similar bursal discs completely covered by a single type of cuticular meshes. Both species also share a disc surface with depressed and raised portions but the patterns differ clearly between the two species.

Figures

FIGURES 21 − 27. Petrocyphon spp. P. cataractae Zwick: 21, male habitus; 22, female genital situs, arrows point to toothed sclerites; 23, bursal rings of another specimen. P. monga Watts: 24, male with erect genitalia; 25, 26, bursal rings, two focus levels; 27, vulvar sclerite. 21 − 24 not to scale.