Microichthyurus quadratus Y. Yang, Liu & X. Yang, 2025
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publication ID |
https://doi.org/10.3897/dez.72.145885 |
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publication LSID |
lsid:zoobank.org:pub:CF9D23E3-A992-4179-8BEE-83F159D358EF |
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DOI |
https://doi.org/10.5281/zenodo.15594215 |
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persistent identifier |
https://treatment.plazi.org/id/8DA99F50-F1E5-50A2-B7B9-A5DAC1D08133 |
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treatment provided by |
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scientific name |
Microichthyurus quadratus Y. Yang, Liu & X. Yang |
| status |
sp. nov. |
Microichthyurus quadratus Y. Yang, Liu & X. Yang sp. nov.
Figs 6 A View Figure 6 , 7 A View Figure 7 , 8 A View Figure 8 , 9 A View Figure 9 , 10 A ‒ D View Figure 10
Etymology.
The specific name is derived from the Latin quadratus (square, squared), referring to its square pronotum.
Type material.
Holotype. China ‒ Yunnan Prov. • ♂; Puer, Lancang, Qianliuyizu, Laopangzhai ; 22.77005°N, 100.22653°E; 1825 m; 23-VI-2017; Z. Zhou & X. L. Luo leg.; MHBU. GoogleMaps
Diagnosis.
The species resembles M. flavifemur Y. Yang, Lin & Liu, 2024 , in the general shape of abdominal sternite VIII of male, but can be easily distinguished from the latter by the following characters: abdominal sternite VIII of male (Fig. 8 A View Figure 8 ) with lateral portions diverging posteriorly from each other, very slender and about 3.0 times as long as basal width, hooked at apices; aedeagus with left dorsal paramere (Fig. 10 B, C View Figure 10 ) extremely short, without long setae at apical margin. Unlike in M. flavifemur , abdominal sternite VIII of male ( Lin et al. 2024 b: fig. 3 B) with lateral portions are parallel to each other, axe-shaped, and about 1.5 times longer than basal width, terminally abruptly constricted into a small hook at apex; aedeagus with left dorsal paramere ( Lin et al. 2024 b: fig. 4 A, C, D) long and covered with a tuft of long setae at apex.
Description.
Body length: 4.0 mm; body width: 0.9 mm.
Male (Fig. 6 A View Figure 6 ). Coloration. Body black, but yellow at antennomeres I ‒ III, coxae, trochanters, femora, and apical 1 / 5 parts of tibiae yellow, as well as apices of elytra.
Eyes moderately large, interocular distance about 0.8 times as wide as diameter of an eye. Antennae extending to posterior margin of abdominal tergite IV, antennomeres II about 1 / 3 length of I, III ‒ XI subequal in length and about 1.2 times longer than II.
Pronotum as long as wide, anterior and posterior margins nearly straight, lateral margins straight and parallel, anterior angles nearly rectangular, and posterior angles rounded. Elytra 1.3 times longer than wide, 1.7 times longer than pronotum, with lateral margins subparallel, sutures slightly dehiscent from the base, distance between sutures slightly wider than the elytron, apices rounded.
Abdominal tergite VIII (Fig. 7 A View Figure 7 ) about 1.2 times longer than wide, with lateral margins slightly arcuate, postero-lateral projections about 2 / 5 length of the tergite, and sinuate at inner margins. Abdominal sternite VIII (Fig. 8 A View Figure 8 ) trilobed, with lateral portions diverging posteriorly from each other, very slender and about 3.0 times as long as basal width, inner apical angles rectangular and outer apical angles feebly hooked outwards; middle portion 1.5 times longer than wide, slightly narrowed posteriorly and rounded at latero-apical angles. Proctiger (Fig. 9 A View Figure 9 ) semicircular, triangularly emarginate in middle of posterior margin, and covered with a few long setae on surface. Paraproct (destroyed with tergal flange missing).
Aedeagus (Fig. 10 A ‒ D View Figure 10 ): left ventral paramere rod-like, moderately sinuate, feebly hooked at apex (Fig. 10 B, C View Figure 10 ); left dorsal paramere extremely short and about 1 / 3 length of left ventral paramere, lamellar and slightly sclerotized, rounded at apical margin (Fig. 10 B, C View Figure 10 ); right paramere rod-like, about 1.1 times longer than left ventral paramere, moderately sinuate and thinnest in middle part (Fig. 10 B, C View Figure 10 ), feebly double-hooked at apex (Fig. 10 C View Figure 10 ); median lobe (Fig. 10 D View Figure 10 ) short and about half length of parameres, slightly sclerotized, grooved at basal part, stout tube-shaped at apical half, rounded at apex.
Female. Unknown.
Distribution.
China (Yunnan).
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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SuperFamily |
Elateroidea |
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SubFamily |
Chauliognathinae |
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Tribe |
Ichthyurini |
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