Phaenonotum tarsale Sharp, 1882

Deler-Hernandez, Albert & Fikacek, Martin, 2016, Redescriptions and lectotype designations of Central American species of Phaenonotum Sharp (Coleoptera, Hydrophilidae) based on the type material from the David Sharp collection, ZooKeys 579, pp. 83-98 : 91-93

Taxon classification Animalia Coleoptera Hydrophilidae

Phaenonotum tarsale Sharp, 1882 Figures 1f, 2e, 3e, 4g

Phaenonotum tarsale Sharp, 1882: 98.

Type material examined.

Lectotype (hereby designated): male (BMNH): " Phaenonotum / tarsale D.S. / Panama. // B.C.A. Col. I. 2. / Phaenonotum / tarsale , / Sharp. // Panama. // Sharp Coll. / 1905.-313." We remounted the specimen on a new label, with abdomen glued separately and aedeagus embedded in Euparal slide attached on the same pin. Paralectotypes: 1 male, 2 unsexed specimens (BMNH): same label data as the lectotype.

Type locality

(following lectotype designation). Panama.

Redescription.

Habitus as in Figs 1f and 2e. Body length 4.7-4.8 mm (lectotype: 4.8 mm). Body form oval in dorsal view (Fig. 1f), elytra highly and evenly convex in lateral view (Fig. 2e). Dorsal surface dark brown (Fig. 1f). Antennae and maxillary palpi testaceous. Pronotum slightly paler than elytra. Ventral surface reddish brown. Leg reddish, tarsomeres yellowish. Head with fine and sparse punctures. Pronotum with punctures of same size as on head, but slightly more sparsely than the head. Elytral punctation strongly impressed, much denser than on pronotum and head. Epipleura very broad throughout. Meso- and metaventral processes fused into a common keel; mesoventral process arrow-head shaped, very wide basally, slightly hooded apically, its base slightly wider than apex of metaventral process, metaventral process stout, parallel-sided, length of metaventrite medially (including metaventral process) ca. three time longer than mesoventral process; metathoracic discrimen weakly developed (Fig. 3e). Profemora with long sparse pubescence in basal 0.75. All tarsi with long setae on ventral surface. Aedeagus (Fig. 4g) 0.7 mm long, with median lobe slightly overlapping apices of parameres; basal portion of median lobe nearly straight laterally, apical portion widely rounded, median lobe nearly of the same width throughout; shape of the gonopore rounded. Parameres slightly sinuate in median region. Phallobase slightly longer than wide.

Comments on lectotype designation.

Our request to borrow the Sharp specimens of Phaenonotum tarsale resulted in the receipt of the above four specimens, all of them corresponding with the original description and clearly part of the type series. In order to fix the identity of the species for future studies, we are designating the dissected male as the lectotype of Phaenonotum tarsale .