Tympallopatrum longitudum Perkins

Perkins, Philip D., 2004, A revision of the Western Australian endemic humicolous beetle genus Tympallopatrum Perkins (Coleoptera: Hydraenidae), Zootaxa 672, pp. 1-16 : 4-5

Tympallopatrum longitudum Perkins

( Figures 1 , 5, 9 )

Tympallopatrum longitudum Perkins, 1997: 147 .

Type Material. Holotype (male): Western Australia, Pemberton, October 1931, P. J. Darlington; deposited in the MCZ. Paratypes: Same data as holotype (12 MCZ). M.V. "Agios Nikolaos III", Fremantle F67 [quarantine interception], 15 October1976, (5 ANIC). 48 km N Albany, Porongurup Nat. Pk., 24 December 1976, litter under karri and Acacia at head of Bolganys Creek, FMHD #76­530, J. Kethley, (49 FMNH). Representative specimens to be deposited in BMNH, CMNH, MVMA, SAMA and WAMP.

Diagnosis. Recognized by the parallel, straight elytral costae ( Fig. 1 ), the lack of elytral callosities, the brownish dorsum with dense yellowish setae on the costae, the midlongitudinal sulcus of the metasternum, and the relatively small size (ca. 1.53 mm long; smallest known species in the genus).

Description. Size (length/width, mm) holotype: body 1.52/0.66; head 0.30/0.42; pronotum 0.39/0.54; elytra 1.04/0.66. Form elongate oval, transversely quite convex. Color brown, dorsal setae on reliefs yellowish.

Labrum deflexed, wider than long, in males with small dentiform apicomedian process and basomedian fovea, in females simple. Frons and clypeus setose, more densely so laterally.

Pronotal disc with anterior midlongitudinal fovea, between setose costae, distinctly longer than but only slightly wider than fovea behind it, low relief between foveae very weakly developed; punctures in anterior fovea forming two short longitudinal series; two granules at margin of each pronotal puncture. Pronotal lateral margin granulose and setose, arcuate, minutely excavate at posterior angles.

Elytra nearly parallel sided, flat on disc, with ten quite regular series of punctures; costae straight, present on even numbered intervals as follow: second interrupted over short distance slightly past midlength; fourth interrupted over short distance in apical fourth, joining with second slightly before apices; sixth ended near distal fourth; eighth ended just before place where second and fourth become confluent. Elytral margin minutely granulate and setose.

Metasternal disc shining, with nearly parallel sided midlongitudinal deep sulcus from base to anterior fourth where joins low midlongitudinal carina. Aedeagus length 0.39 mm ( Fig. 5).

Figures

FIGURE 1. Tympallopatrum longitudum holotype, dorsal and lateral habitus.

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