Martarega pydanieli Barbosa, Ribeiro, Nessimian, 2012

Barbosa, Julianna Freires, Ribeiro, José Ricardo Inacio & Nessimian, Jorge Luiz, 2012, A synopsis of Martarega White, 1879 (Insecta: Heteroptera: Notonectidae) occurring in the Brazilian Amazonia, with descriptions of three new species, Journal of Natural History 46 (17 - 18), pp. 1025-1057 : 1037-1038

Martarega pydanieli Barbosa, Ribeiro, Nessimian , sp. nov.

( Figures 3A–D , 13A)

Type material

Holotype. Brazil, Rondônia State, Ariquemes Municipality, Jamari River, Igarapé Bom Futuro [10.133 ◦ S, 63.200 ◦ W], 30.VII.1985, ( V. Py-Daniel and L.S. Aquino): 1 m ( INPA), brachypterous.

Description of holotype (brachypterous form)

Measurements. Body length (from apex of head to apex of hemelytra at rest): 5.8; length of vertex: 0.28; greatest width of vertex: 0.26; width of eye: 0.6; length of ocular commissure: 0.34; length of head: 0.60; greatest width of head: 1.20; length of pronotum: 0.42; greatest width of pronotum: 1.36; median length of scutellum: 0.62; greatest width of scutellum: 0.86.

Colour. General colour pale yellowish. Setae whitish. Eyes brown; fourth rostral segment brown. Hemelytra yellowish, with hyaline median longitudinal stripe not bifurcate ( Figure 3A ) and second stripe extending anteriorly from base of hemelytral process onto approximately one-third of hemelytra; hairs of meso- and hind trochanters brown to blackish. Connexivum with numerous light brown setae.

Head, thorax and abdomen. Head rounded; anterior margin of vertex convex, protruding before eyes, shorter than its length; ocular commissure longer than vertex, about three-fifths as long as the width of one eye. Pronotum with lateral margins strongly divergent; posterior margin concave; greatest pronotum width about 3.2 times its length in dorsal view; lateral margins of scutellum concave, wider than long, longer than median length of pronotum; internal margin of embolium without toothed area; hemelytral process three-fifths as long as membrane ( Figure 3A ); forefemora without spines; mesotrochanters with lateral margin somewhat straight or angled, and several scattered short setae distributed ventrally near outer lateral margin ( Figure 3B ); mesofemora without nodules; metaxyphus rounded; hind trochanters with continuous margin; hind femora with 11 setae distributed throughout inner lateral margins. Ventral abdominal keel with hairs distributed throughout lateral and anteroventral surfaces.

Male genitalia. Genital capsule dorsally produced near right clasper; left clasper somewhat rounded, heart-like ( Figure 3D ); right clasper irregular, narrower than left, slightly wider than longer ( Figure 3C ).

Macropterous forms and female specimens unknown.

Etymology

The name pydanieli honours Dr Victor Py-Daniel (INPA), who collected the only known male specimen of this species.

Taxonomic notes

The genital capsule is usually not exceedingly varied among Martarega species. We can find otherwise reliable variation among the shape of genital capsule in the specimen of M. pydanieli sp. nov. The left clasper tends to be longer than the right in several species. Martarega pydanieli sp. nov., however, can be readily recognized by the presence of a distinct dorsally rounded process near left clasper, as well as by distinctive heartshaped left clasper ( Figure 3D ).

Keying M. pydanieli , sp. nov. in the key to the Martarega species presented by Truxal (1949), members of this new species mistakenly key out to M. brasiliensis . In spite of resembling this species in having the ventral surface of mesotrochanter smooth, without central nodules or central groups of short bristles, members of M. brasiliensis do not display those peculiar genitalic features. Martarega pydanieli sp. nov. can be readily recognized by the mesotrochanter with its lateral margin varying from somewhat straight to angulose, without a patch of yellow setae on ventral surface ( Figure 3B ), by the hemelytral process about three-fifths as long as membrane ( Figure 3A ), and by the distinctive shape of male genitalia ( Figure 3C,D ).

Figures

Figures 1–4. Martarega species occurring in Brazilian Amazonia.Figure 1. Martarega barcelos Barbosa, Ribeiro, Nessimian sp. nov. (holotype). (A) Male hemelytra (lateral view); (B) male mesotrochanter with one group of short bristles at outer lateral margin; (C) male genital capsule