Mixaderus tamisieri, Gompel, 2021

Gompel, Nicolas, 2021, New Mixaderus species from the Mascarene Islands (Coleoptera: Aderidae), Zootaxa 4969 (1), pp. 166-174 : 169-170

Mixaderus tamisieri n. sp.

( Figures 1b , 2c,j,s )

Etymology. This species is named after my dear friend Jean-Philippe Tamisier, a long-term supporter of my work on Aderidae systematics.

Type locality. France: La Réunion, Saint-Philippe, Mare Longue , (15 m) [21°21’ S 55°45’ E] .

Distribution. France: La Réunion.

Description. Body length. ♂: 1.93± 0.07 mm (n=2); ♀: 1.90± 0.35 mm (n=2). Body brown with white markings on the thorax and the elytra. Appendages orange.

Head. Transverse, dark brown on the frons to orange anteriorly between the eyes, slightly wider than pronotum, with large eyes in both sexes. Frons strongly depressed. Palpi orange. Punctuation dense, spaces between punctures equivalent to the puncture diameters, punctures small but deep. Pubescence double, dense, with yellow setae and a whitish-silver pruinosity largely masking the tegument. Eyes interrupting the posterior edge of the head in side view ( Figure 2s ).

Antennae ( Figure 2j ). Thin, half (♀) to 3/5 (♂) the length of the elytra, entirely orange, pubescent. Antennomeres 2‒8 regularly cylindrical, as long as wide, antennomeres 9‒10 transverse and conical, and antennomere 11 thick, more than twice longer than penultimate.

Pronotum. Trapezoidal, with larger base against the elytra, sub-quadrate. Convex, marked by a pair of strong and confluent dimples just anterior to the posterior border. Sides straight. Surface, densely punctuated with relatively small deep punctures separated by less than their diameters. Pubescence dense, double, composed of short appressed setae arising from the punctures, and interspersed pruinosity masking most of the tegument. The pruinosity is yellowish, except in the dimples where it is silver.

Elytra. Length: ♂: 1.41± 0.09 mm (n=2); ♀: 1.34± 0.19 mm (n=2). Long, sides subparallel, with humeral callus well marked. Punctuation stronger than on the pronotum, deep and dense, the punctures separated by their own diameters or less. Disc weakly convex. Pubescence dense, wholly, golden, comprised of setae borne from the punctuation and interspersed pruinosity, with a distinct and complex pattern of white-creamish pubescence the elytra. The pattern is composed of a large polygonal patch on the disc, a convoluted strip running laterally on each elytron and connecting the humeral callus to the middle of the declivity, and an apical domain. The different pattern elements are confluent in some specimens, but the boundaries between these pale markings and the brown background are sharp. Scutellum covered with white-creamish pubescence.

Legs. Simple, dark orange.

Sexual dimorphism. Foretarsae somewhat thicker and antennae longer in the ♂.

Aedeagus ( Figure 2c ). Progressively and regularly tapered from base to apex, phallobase long, a third of the phallus’ length. Accessory lobes of the apicale present, not reaching the apex of phallus.

Type material. France: La Réunion, Saint-Denis, La Grande Chaloupe , (50 m) [20°53’ S 55°22’ E], foliage beating, 14.II.2006 (1 ♀ paratype, MHNRUN); La Réunion, Sainte-Marie, La Ressource, (310 m) [20°56’ S 55°31’ E], light trap, 2.IX.2017, E. Lemagnen leg. (1 ♂ paratype, ELPC); La Réunion, Saint-Philippe, Basse Vallée, (30 m) [21°22’ S 55°42’ E], foliage beating, 7. VI.2012 (1 ♀ paratype, MHNRUN); La Réunion, Saint-Philippe, Mare Longue , (15 m) [21°21’ S 55°45’ E], foliage beating, 31.I.2017, J. Poussereau leg. (1 ♂ holotype, NGPC) .

Figures

FIGURE 1. Habitus of new species of Aderidae from the Mascarene Islands. a, Mixaderus reunionensis n. sp. (♂ holotype from La Réunion); b, Mixaderus tamisieri n. sp. (♂ paratype from La Réunion); c, Mixaderus mauritiensis n. sp. (♀ holotype from Mauritius); d, Mixaderus chassaini n. sp. (♂ holotype from La Réunion); e, Mixaderus lemagneni n. sp. (♂ paratype from La Réunion); f, Mixaderus voisini n. sp. (♀ paratype from La Réunion). Scale bars: 0.5 mm.

FIGURE 2. Anatomy of new species of Aderidae from the Mascarene Islands. a–g: aedeagus of a, Mixaderus reunionensis n. sp. (♂ holotype from La Réunion); b, Mixaderus chassaini n. sp. (♂ holotype from La Réunion); c, Mixaderus tamisieri n. sp. (♂ paratype from La Réunion); d, Mixaderus lemagneni n. sp. (♂ paratype from La Réunion); e, Mixaderus gomyi Gompel, 2012 (♂ holotype from La Réunion); f–g, Mixaderus voisini n. sp.: f, anterior struts retracted (♂ holotype from La Réunion); g, anterior struts extended from phallobase (♂ paratype from La Réunion). h–o: antennae of h, Mixaderus reunionensis n. sp. (♂ holotype from La Réunion); i, Mixaderus chassaini n. sp. (♂ holotype from La Réunion); j, Mixaderus tamisieri n. sp. (♂ paratype from La Réunion); k, Mixaderus lemagneni n. sp. (♂ paratype from La Réunion); l, Mixaderus gomyi Gompel, 2012 (♂ holotype from La Réunion); m, Mixaderus mauritiensis n. sp. (♀ holotype from Mauritius); n, Mixaderus voisini n. sp. (♀ paratype from La Réunion). o,p: male right prothoracic tarsae of o, Mixaderus gomyi Gompel, 2012 (♂ holotype from La Réun- ion); p, Mixaderus lemagneni n. sp. (♂ paratype from La Réunion). q–v: Mixaderus head schematics in side view. q, Mixaderus reunionensis n. sp.; r, Mixaderus chassaini n. sp.; s, Mixaderus tamisieri n. sp.; t, Mixaderus lemagneni n. sp.; u, Mixaderus voisini n. sp.; v, Mixaderus mauritiensis n. sp. Scale bars: 0.1 mm.