Tympallopatrum curvicostum, Perkins, Philip D., 2004

Perkins, Philip D., 2004, A revision of the Western Australian endemic humicolous beetle genus Tympallopatrum Perkins (Coleoptera: Hydraenidae), Zootaxa 672, pp. 1-16 : 6-7

Tympallopatrum curvicostum new species

( Figures 3 , 7, 11 )

Type Material. Holotype (male): Western Australia, Porongurup N. P., Bolganup Ck., 34° 37' S, 117° 56' E, 12 June 1980, S. & J. Peck. Deposited in the ANIC. Paratypes: Same data as holotype (14 ANIC). Walpole N. P., “Tingle Tree”, berlesate fungi and litter, SBP63, 35° 0' S, 116° 38' E, 18–27 June 1980, S. & J. Peck (1 ANIC). Warren Nat. Pk., flight intercept trap with trough, 34° 28' S, 115° 58' E, 24 October–2 November 1984, J. & N. Lawrence (2 ANIC). Warren Nat. Pk., pyrethrin fogging bark of standing dead Casuarina, 34° 28' S, 115° 58' E, 2 November 1984, J. & N. Lawrence (2 ANIC). Representative specimens to be deposited in MCZ, QMBA, and WAMP.

Diagnosis. Recognized by the curving costae on the elytral disc ( Fig. 3 ), the sinuate costae over the posterior declivity, the shining clypeus, the piceous dorsum, the median oval fovea of the metasternum, and the relatively large size (ca. 1.79 mm long; the largest known species in the genus). The other piceous species, T. callosum , has much larger callosities, is more oval in form, and smaller in size.

Description. Size (length/width, mm) holotype: body (length to elytral apices) 1.79/ 0.75, head 0.33/0.47, pronotum 0.45/0.61, elytra 0.99/0.75. Form elongate oval, transversely convex, elytra rather flat on disc. Dorsum piceous, legs dark brown, ocelli and setae on reliefs light brown.

Labrum deflexed, wider than long, in males with prominent dentiform median process and basomedian fovea. Clypeus setose at margins, very sparsely granulate on disc, shining. Frons more strongly densely granulate, lateral margins setose and markedly angulate. Frons with median oval setose and granulate tumidity.

Pronotal disc with anterior oval fovea, between setose costae, ca. two times as large as fovea behind it, relief between foveae well developed; punctures and granules in anterior fovea forming two longitudinal series; reliefs setose and granulate. Pronotal lateral margins strongly granulate and setose, arcuate from anterior angles then weakly recurved before weak posterior angles.

Elytral sculpture complex, strongly punctate, with setose costae and depressed areas as illustrated ( Fig. 3 ). Elytral margin minutely granulate and setose.

Metasternal disc dull laterally, weakly shining medially, with large oval median fovea. Aedeagus length 0.57 mm ( Fig. 7).

Etymology. Named in reference to the arcuate elytral costae.

Figures

FIGURE 3. Tympallopatrum curvicostum holotype, dorsal and lateral habitus.

FIGURES 9 – 12. Tympallopatrum geographical distributions. — 9. T. longitudum. — 10. T. aureolum. — 11. T. curvicostum. — 12. T. callosum.