Phaenonotum apicale 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 : 84

Taxon classification Animalia Coleoptera Hydrophilidae

Phaenonotum apicale Sharp, 1882 Figures 1a, 2a, 3a, 4a

Phaenonotum apicale Sharp, 1882: 98.

Type material examined.

Lectotype (hereby designated): male (BMNH): " Phaenonotum / apicale Var. / D.S. / Guatemala City. / 5000 ft. Salvin. // Guatemala City. Champion. // B.C.A. I. 2. / Phaenonotum / apicale , Sharp. // Sharp Coll. 1905.-313." The specimen was re-mounted to a new label, with abdomen glued separately and aedeagus embedded in Euparal slide attached below the specimen. Paralectotype: female (BMNH): " Phaenonotum / apicale / Type / D.S. / Chontales, Nicaragua / Janson. // Chontales, / Nicaragua. / Janson. // B.C.A. Col. I. 2. / Phaenonotum / apicale , / Sharp. // Sharp Coll. / 1905.-313.".

Other material examined.

1 unsexed specimen (BMNH): " Phaenonotum / apicale Var.? / David. Chiriqui / Champion // David, / Panama / Champion. // B.C.A. Col. I. 2. / Phaenonotum / apicale , / Sharp. // Sharp Coll. / 1905.-313."; 1 unsexed specimen (BMNH): "Cuernavaca, / Morelos. / Hoge. // B.C.A. Col. I. 2. / Phaenonotum / apicale , / Sharp. // apicale / var, [hand written]"; 1 unsexed specimens (BMNH): "Tejupilco, Mex. / Temescaltepec / 18.vi.1933 [hand written] // H. E. Hilton, / R. L. Usinger / Collectors"; male (BMNH): "Tejupilco, Mex. / Temescaltepec / 18.vi.1933 [hand written] // H. E. Hilton, / R. L. Usinger / Collectors // Phaenonotum [hand written] / apicale Sharp [hand written] / J. Balfour-Brown det.".

Type locality

(following lectotype designation). Guatemala City, 5000 feet [= 1525 m a.s.l.], Guatemala.

Redescription.

Habitus as in Figs 1a and 2a. Body length 2.9-3.2 mm (lectotype: 2.9 mm). Body form oval in dorsal view (Fig. 1a), elytra uniformly convex in lateral view (Fig. 2a). Dorsal surface dark brown (Fig. 1a). Antennae and maxillary palpi testaceous. Ventral surface reddish. Leg reddish, tarsomeres yellowish. Head and pronotum with fine and sparse punctures. Elytral punctation strongly impressed, coarser than pronotal and head punctation. Pronotum wider than long and convex. Epipleura very broad throughout. Meso- and metaventral processes fused into a common keel; mesoventral process arrow-head shaped with a distinct hood, as wide as metaventral process basally, metaventral process slender, parallel-sided, length of metaventrite medially (including metaventral process) ca. four times longer than mesoventral process; metathoracic discrimen indistinct (Fig. 3a). Profemora with long sparse pubescence in basal 0.75. Meso- and metafemora with very sparse and short pubescence only. All tarsi with long setae on ventral surface. Aedeagus (Fig. 4a) 0.4 mm long, with median lobe reaching apices of parameres; basal portion of median lobe angulate laterally, apical portion strongly narrowing; shape of the gonopore oval. Parameres wide and curved in median region. Phallobase not examined in detail.

Comments on lectotype designation.

Sharp (1882) mentions specimens from two localities: Nicaragua: Chontales and Guatemala: Guatemala City, but without specifying the number of specimens. In the Sharp collection, there are two specimens standing under the name of Phaenonotum apicale , one from each locality mentioned, and both corresponding with the data in the original description. We hence consider both as syntypes. The specimen from Guatemala City is the only male, and thus is designated here as lectotype, despite it appearing to be slightly teneral. Otherwise, there are four specimens from localities not corresponding to those given in the original description, which we do not consider as a part of the type series (see Other material examined).