Rentonellum Crowson, 1966

Kolibac, Jiri, 2013, Trogossitidae: A review of the beetle family, with a catalogue and keys, ZooKeys 366, pp. 1-194 : 96-97

Genus Rentonellum Crowson, 1966 Figs 9 , 17 ; Map 10

Rentonellum Crowson, R. A. 1966: 120.

Type species.

Rentonellum apterum Crowson, 1966 [by original designation and monotypy]

Kolibáč, J. 2005: 80. Kolibáč, J. 2006: 111 (phylogeny)

Description.

Body size: about 1.0 mm. Body shape conglobate. Gular sutures wide, subparallel. Frontoclypeal suture present. Frons: longitudinal groove or depression absent. Cranium ventrally: tufts of long setae at sides absent. Submentum: ctenidium absent. Antennal groove present. Eyes: size large, lateral. Eyes number: two. Epicranial acumination absent. Lacinial hooks absent. Galea: shape partially fused with lacinia. Galea: ciliate setae absent. Mediostipes-Lacinia fused together. Palpifer: outer edge even. Mandibular apical teeth number: two, horizontally situated. Mola present. Penicillus (at base) absent. Pubescence above mola or cutting edge absent. Ventral furrow absent. Basal notch shallow or absent. Labrum-Cranium not fused. Epipharyngial sclerite absent. Lateral tormal process: projection projection not developed (all remaining). Ligula: ciliate setae absent. Ligula rigid, not retroflexed, weakly emarginate. Hypopharyngeal sclerite consisting of two separate parts. Antenna 10 -segmented. Antennal club symmetrical, sensorial fields absent. Front coxal cavities externally open, internally closed. Pronotum transverse. Prepectus absent. Middle coxal cavities closed. Elytra: long hairs absent. Epipleuron wide. Elytral interlocking mechanism absent, carinae reduced. Elytral punctation irregular, scales absent. Front tibiae: spines along side reduced. Hooked spur absent, apical spurs not hooked or weakly hooked. Claws: denticle absent. Parasternites number along ventrites III-VII: one. Coxitae undivided.

Biology.

Rentonellum apterum was found in Nothophagus and Podocarpus leaf-litter at an altitude of 900 m ( Crowson 1966). The circumstances of the second species record are not known.

Distribution.

New Zealand; Brazil: "Nova Teutonia".

Species:

Rentonellum apterum Crowson, 1966; New Zealand (RAC)

Crowson, R. A. 1966: 120. Kolibáč, J. 2005: 80

Rentonellum loebli Kolibáč, 2005; Brazil: "Nova Teutonia" (JK)

Kolibáč, J. 2005: 80

Note: It has been recently proposed that Rentonellum loebli might be a ciide rather than a rentoniine species ( Lawrence and Ślipiński 2013).

Figures

Figure 9. A Peltis (syn. Zimioma, Ostoma) grossa B Peltis (syn. Ostoma) ferruginea C Colydiopeltis loebli D Colydiopeltis compactum E Colydiopeltis burckhardti F Parapeltis australicum G Protopeltis viridescens H cf. Globorentonium plaumanni, Brazil (1 - 3: three different specimens from the same locality).

Map 10. A distribution of the tribe Thymalini including Rentonium - group.

Figure 17. A-B " Rentonellum " loebli (A ventral surface B prosternal intercoxal process) C cf. Globorentonium plaumanni, Brazil (C ventral surface D pro- and mesothorax ventrally E head ventrally F detail of mouthparts G protibia with tarsus H mesotibia with tarsus).