Malgachemenes aberrans, Selis, 2025
publication ID |
https://doi.org/10.11646/zootaxa.5705.1.1 |
publication LSID |
lsid:zoobank.org:pub:F8C98380-AA48-4BB9-9A6B-C9B3D72E154E |
DOI |
https://doi.org/10.5281/zenodo.17326998 |
persistent identifier |
https://treatment.plazi.org/id/190A0E05-FF82-FF8D-FF0A-FAF40702C7E2 |
treatment provided by |
Plazi |
scientific name |
Malgachemenes aberrans |
status |
sp. nov. |
Malgachemenes aberrans sp. nov.
( Figs 46 View FIGURE 46 , 65I View FIGURE 65 )
Diagnosis. Malgachemenes aberrans is readily differentiated from the other species of Malgachemenes by the following characters: submarginal carina of propodeum developed in a sharply pointed lobe fused with propodeal valvula ( Fig. 46C View FIGURE 46 ), basally carinate T1 ( Fig. 46D View FIGURE 46 ), T2–T3 with regular long lamella not reduced to lateral flaps ( Fig. 46E View FIGURE 46 ), T3–T5 with deep transverse furrow running in the area covered by previous tergite, S2 shallowly depressed on disc, and large cephalic foveae ( Figs 46F, G View FIGURE 46 ).
Type material examined. HOLOTYPE: ♀ labelled “ CASENT / 2081403 // MADAGASCAR: Majunga / Ampijoroa NP, 160 km N / of Maevatanana on RN 04 / 43m, 19–26 Oct 2003 / 16°19.16'S " 46°48.80'E / R. Harin’Hala, col. // CASLOT 016560 / malaise in deciduous / forest MA-25-20 // Malgachemenes aberrans / HOLOTYPUS ♀ / Det. Marco Selis 2024 [red label]” ( CAS, code CASTYPE21760) GoogleMaps . PARATYPES: same locality as holotype, 24–31.VIII.2003, 1♀ ( MSVI, code CASENT2153771 ) GoogleMaps ; same locality as holotype, 28.IX–5.X.2003, 1♀ ( CAS, code CASENT2153675 ) GoogleMaps .
Description. Female holotype ( Fig. 46B View FIGURE 46 ). Body length 7.5 mm; fore wing length 6.0 mm.
Head as wide as high and with vertex visible in frontal view. Clypeus in frontal view 1.05× as wide as long, apical margin shallowly emarginate and 0.28× as wide as clypeus, apical teeth obtuse; clypeus in lateral view weakly convex in basal half, then flattened to apex. Vertex 1.75× as long as ocellocular distance, distinctly swollen in lateral view; cephalic foveae large and deep, separated by about their diameter and posteriorly margined by a blunt ridge. Gena 0.6× as wide as eye at bottom of ocular sinus; occipital carina complete, stronger on gena and markedly angled in the lower half of gena; area below occipital carina on vertex developing a long vertical face ventrally margined by a second carina, distance between carinae higher than one ocellar diameter. Flagellum short and apically thickened, F1 1.35× as long as wide and 1.4× as long as F2, following flagellomeres becoming progressively shorter and wider. Mesosoma 1.65× as long as wide and almost parallel-sided in dorsal view, subcylindrical, in lateral view forming an evenly flattened surface from pronotum to propodeal shelf. Pronotum with weakly convex and slightly converging sides; pronotal carina complete and shortly lamellate on dorsal portion, with lamella slightly longer on humeri than medially, lateral portions strongly anteroposteriorly oblique, sinuate below pronotal fovea; pretegular carina absent. Mesoscutum longer than wide, posterior margin with hints of notauli partly concealed by the sculpture. Scutellum almost twice as wide as long, weakly convex laterolaterally, anterior margin shallowly crenulate; axillary fossa small and circular, about half as large as anterior ocellus. Metanotum entirely flattened with medially produced posterior margin. Tegula short with broadly rounded outer margin, posterior lobe obtusely angled and blunt, not equaling parategula; parategula digitiform and barely curved. Mesepisternum forming an evenly curved surface in continuity with pronotum and mesosternum, slightly bulging along posterior margin; epicnemial carina absent, replaced by a very shallow fold of the surface, visible only under incident light. Propodeum elongate, longer than metanotum in dorsal view, sides weakly converging in anterior half, then strongly converging behind posterolateral angles of propodeum; dorsal faces of propodeum strongly sloping mediolaterally and meeting for a short length behind metanotum, forming a rudimentary propodeal shelf that smoothly passes into the posterior concavity; lateral faces of propodeum shallowly concave, dorsally margined by very blunt lateral carinae; posterior face of propodeum flattened and vertical in dorsal half, then forming two deep pits just above propodeal orifice, pits separated by a strong but blunt longitudinal carina; submarginal carina of propodeum developed in a pointed and slightly upturned lobe fused with propodeal valvula. T 1 in dorsal view bell-shaped and slightly longer than apically wide; anterior margin transversely carinate, carina strong dorsally and weakly curved toward spiracles but not reaching them, carina separating a very short vertical anterior face and a much longer horizontal posterior face, horizontal face evenly convex in lateral view; apical margin of T1 with a thick and long translucent lamella, partly continuing on lateral margins; sides of T1 meeting ventrally on basal stalk. T2 elongate and with strongly convex sides, apically much wider than T1; apical margin of T2 with a thick and regular yellow-translucent lamella, about twice as long as apical lamella of T1. T3 apically lamellate like T2, but lamella shorter and laterally forming thick lamellar flaps adjacent to the surface of the tergite, anterior extremity of the flaps continuing in a thick transverse carina hidden under previous tergite, transverse carina anteriorly bordering a deep and coarsely punctate, medially interrupted transverse furrow. T4–T5 with lateral lamellar flaps and basal transverse furrow similar to T3, but apical margin not lamellate. S2 with shallowly concave disc, in lateral view with a shallow bulge delimiting an anterior sloping face and a posterior concave face; apical margins of S2–S5 with ill-defined apical translucent margin.
Head and mesosoma with coarse deep punctures, interspaces mostly reduced to ridges much narrower than puncture diameter; clypeus more sparsely and finely punctured, interspaces at least as wide as puncture diameter and shiny, sparsely micropunctate; punctures becoming progressively sparser ventrally on gena; anterior face of pronotum smooth and very shiny, with some deep punctures on lateral thirds; mesepisternum with larger and sparser punctures, interspaces reaching one puncture diameter in width; lateral faces of propodeum with sparse deep punctures; posterior concavity of propodeum with transverse striae in the ventral pits; tegula mostly smooth, with fine deep punctures on anterior and posterior corners. T1 punctured similar to head and mesosoma, but interspaces slightly wider and much shinier; T2 with deep oblique punctures, becoming progressively finer and sparser posteriorly; T3–T6 with coarse irregular punctures, similar to apical third of T2, becoming more sparsely punctate from T3 to T6; S1 irregularly ridged and punctured; S2 almost impunctate on basal sloping part, posteriorly with large deep punctures becoming denser on disc; S3–S6 much more finely punctured than respective tergites. Entirely covered in sparse dust-like brownish pubescence, denser but less-evident on metasoma; sternites with short pale bristles apically.
Head and mesosoma dark-red, with irregular and undefined brighter and darker markings; clypeus brighter red with paired yellow spots above apical teeth; narrow margin along pronotal carina, posterior spot on tegula, and parategula, pale yellow; pointed lobe of submarginal carina partly white. Metasoma generally brighter: T1–T2 bright red with ivory apical band, T3–T6 and sternites yellowish-orange, S2 with broad suffused apical ivory band. Legs black from coxa to femur, orange-red on tibia and tarsus. Wings brown-hyaline, slightly darker along anterior margin.
Male. Unknown.
Distribution. Madagascar: Mahajanga ( Fig. 65I View FIGURE 65 ).
Etymology. The species epithet is in reference to the aberrant morphology of this species compared to other Malgachemenes species. It is an adjective.
Notes. Although collected in the same locality across a short period of time, the three examined females present differences in pattern, density of punctures on clypeus, development of lateral lobes on tergites and, most notably, cephalic foveae. While the first three characters are subject to variation in other species of Malgachemenes too, the same is not observed for the cephalic foveae morphology. The holotype has the foveae separated by about their diameter ( Fig. 46F View FIGURE 46 ), while in the paratypes they are fused in a single median pit ( Fig. 46G View FIGURE 46 ). These differences are here regarded as simple intraspecific variability, as the three specimens match in all diagnostic characters.
R |
Departamento de Geologia, Universidad de Chile |
CAS |
California Academy of Sciences |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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