Phaenonotum collare 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 : 85-86

Taxon classification Animalia Coleoptera Hydrophilidae

Phaenonotum collare Sharp, 1882 Figures 1b, 2b, 3b, 4b

Phaenonotum collare Sharp, 1882: 99.

Type material examined.

Lectotype (hereby designated): male (BMNH): " Phaenonotum / collare D.S. // Chontales, / Nicaragua. / Janson. // B.C.A. I. 2. / Phaenonotum / collare , / Sharp. // Sharp Coll. 1905.-313.". The specimen was dissected, its abdomen is glued separately and the aedeagus is embedded in Euparal slide attached to the same pin. Paralectotypes: 1 female, 1 unsexed (BMNH): "Phaen / Cyclonotum / collare D.S. / Type / Chontales. Nicaragua. / Janson // B.C.A. I. 2. Phaenonotum / collare , Sharp. // Sharp Coll. 1905.-313."; " Phaenonotum / collare D.S. / Chontales. Nicaragua. / Janson / B.C.A. I. 2. Phaenonotum / collare , Sharp. / Sharp Coll. 1905.-313.".

Other material examined.

unsexed specimen (BMNH): " Phaenonotum / collare Var. / D.S. / El Zumbador / 2500 ft. Champion // El Tumbador, / Guatemala. / Champion. // B.C.A. I. 2. / Phaenonotum / collare , / Sharp. // Phaenonotum collare [hand written]".

Type locality

(following lectotype designation). Chontales, Nicaragua.

Redescription.

Habitus as in Figs 1b and 2b. Body length 3.5-3.9 mm (lectotype: 3.9 mm). Body form oval in dorsal view (Fig. 1b), elytra less convex anteriorly and more convex posteriorly in lateral view (Fig. 2b). Dorsal surface brown (Fig. 1b). Antennae and maxillary palpi testaceous. Ventral surface reddish brown. Leg reddish, tarsomeres yellowish. Head with coarse and strongly impressed punctures. Pronotum with fine punctures, but sparser than head punctation. Elytral punctation (Fig. 1b) strongly impressed, punctures of the same size as on head and as coarse as head punctations. Epipleura very broad throughout. Meso- and metaventral processes slender and fused into a common keel; mesoventral process arrow-head shaped with an distinct hood, slightly wider than apex of metaventral process basally, metaventral process slender, nearly parallel-sided, only indistinctly narrowing anteriad, length of metaventrite medially (including metaventral process) ca. four time longer than mesoventral process; metathoracic discrimen distinct, forming a shallow impression basally (Fig. 3b). All tarsi with long setae on ventral surface. Aedeagus (Fig. 4b) 0.4 mm long, with median lobe reaching apices of parameres; basal portion of median lobe rounded laterally, apical portion widely rounded, median lobe narrowing towards apex; shape of the gonopore transversely oval. Parameres wide and slightly sinuate in median region. Phallobase as long as wide.

Comments on lectotype designation.

Sharp (1882) mentions specimens from two localities: Nicaragua: Chontales and Guatemala: El Tumbador, without specifying the numbers of specimens. Specimen(s) from Guatemala are assigned to the "var. paulo angustior" [= a little narrower], which excludes them from the type series based on Article 72.4.1 of the Code ( ICZN 1999). In the Sharp collection, there are four specimens under the name Phaenonotum collare , three of which correspond to the Nicaraguan specimens mentioned in the original description, and one corresponding with "var. paulo angustior". Only the specimens from Nicaragua are considered as part of the type series, and one of them, a dissected male, is designated as a lectotype, in order to fix the identity of the species for future studies.