Perkins, Philip D., 2018, A new genus and new species of Meropathina from Lord Howe Island (Coleoptera: Hydraenidae), Zootaxa 4444 (4), pp. 409-420: 413-415

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Subtribe Meropathina  Perkins

Perkins 1997: 143.

The many morphological differences betWeen the genera of Meropathina  are discussed and illustrated by Perkins (1997, 2004). Some of these differences are summarized beloW and presented in the key to genera that folloWs.

Recent unpublished DNA sequence data (I. Ribera, pers. com.) has corroborated the sister group relationships of the Ochthebiina  and Meropathina  , Which Were proposed by Perkins (1997) on the basis of the hypomeral antennal pocket morphology, and differences in the exocrine secretion delivery systems, among other morphological characters.

The antennal club of all members of Meropathina  have sensilla interspersed With the hydrofuge setae. These sensilla are usually located near the distal end of the club articles. In members of Meropathus  ( Fig. 12 View Figure ) and Tympanogaster  they are not organized into groups, Whereas in Tympallopatrum  the sensilla form distinct clusters ( Figs. 15, 16 View Figure ). The antennae of Prototympanogaster  are similar to those of Tympanogaster  .

The maxilla in members of Tympanogaster  provide distinctive, derived features ( Figs. 25–28 View Figure ). The lacinia has a large, scoop-like, apical tooth in Tympanogaster  ; in the presumed ancestral condition of the Ochthebiini  this structure has a tooth-like shape With a bifid apex (see Perkins 1980: 297). The galea has several closely spaced, flat teeth that together form a palmate shape; this is unique in the family. There is some variation in the length and proportions of the maxillary palpi. This variation, like the variation in leg length, is related to the microhabitat: the strictly aquatic members having longer legs and palpi, and the moss dWelling or humicolous species having shorter legs and palpi. The maxillae of Prototympanogaster  ( Fig. 21 View Figure ) are similar in morphology to that of Tympanogaster  , and the legs are moderately long.

The mentum of Prototympanogaster lordhowensis  and Meropathus chuni  are different in shape and especially chaetotaxy ( Figs. 21, 22 View Figure ).