Nesiotus olibroides Guillebeau, 1896

Gimmel, Matthew L., 2013, Revision of the Malagasy genusNesiotusGuillebeau (Coleoptera: Phalacridae), The Coleopterists Bulletin 67 (2), pp. 123-132 : 123-132

Nesiotus olibroides Guillebeau, 1896

Nesiotus olibroïdes [sic] Guillebeau 1896: 298–299.

Diagnosis. This species may be distinguished from other members of the genus by the moderately elongated antennomere XI in the male, the size of the eye in frontal view (separated by about 1.5 times width of one eye), the elytral interval microsetae in two rows, the penis abruptly widened at about mid-length and with a narrowly rounded apex, the fused parameres of the tegmen long-triangular, and by the lack of dorsal struts on the basal piece of the tegmen.

Lectotype. Male, genitalia dissected and mounted in DMHF on card with specimen, with label data “Alluaud [handwritten] // Diego Suarez [handwritten] // MUSEUM PARIS \ COLL. GÉNÉRALE // HOLOTYPE [red label] // Nesiotus \ olibroides \ Guilb. [handwritten] // LECTOTYPE \ Nesiotus \ olibroides Guillebeau \ des. M.L. Gimmel 2009 [red label]” deposited in MNHN . Paralectotype possibly in The Natural History Museum, London (BMNH).

Redescription. Length 1.5 mm. Dorsal coloration ( Fig. 26 ) evenly rufotestaceous. Appendages reddish testaceous. Head: Eyes separated by about 1.5 times width of a single eye in frontal view ( Fig. 34 ). Male antennomere XI about as long as IX–X combined, IX–X combined about as long as funicle. Female unknown. Thorax: Pronotum with anterior bead not narrowed medially; posterolateral angle sharp, slightly obtuse; posterior border margined in about medial one-sixth. Elytral interval microsetae in 2 irregular rows. Genitalia: Penis ( Fig. 11 ) with narrowly rounded apex; abruptly widened at about mid-length; internal sac sclerites as illustrated. Tegmen ( Fig. 18 ) with fused parameres long-triangular, apex narrowly rounded, subapical setae not evident; basal piece nearly parallel-sided; without acuminate struts.

Distribution. This species is known only from the type locality of Antsiranana (= Diego-Suarez), Antsiranana Province, Madagascar.

Figures

Figs. 20–27. Dorsal habitus and type labels of Nesiotus species. Dorsal habitus: 20) N. basalis; 21) N. fisheri; 22) N. joebranhami; 23) N. nocitus; 24) N. ocularis; 25) N. steineri; 26) N. olibroides, lectotype. All habitus images to same scale. Labels: 27) N. olibroides, lectotype.

Figs. 34–35. Frontal habitus and range map of Nesiotus species. 34) Nesiotus olibroides, lectotype, frontal habitus; 35) Range map of Nesiotus species in Madagascar.

Figs. 6–19. Aedeagal sclerites of Nesiotus species. Penis: 6) N. basalis; 7) N. fisheri; 8) N. joebranhami; 9) N. nocitus; 10) N. ocularis; 11) N. olibroides; 12) N. steineri. Tegmen:13) N. basalis; 14) N. fisheri; 15) N. joebranhami; 16) N. nocitus; 17) N. ocularis; 18) N. olibroides; 19) N. steineri. Scale bar = 0.1 mm.