Microichthyurus tertius 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.15594229 |
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persistent identifier |
https://treatment.plazi.org/id/67FF43DE-B942-5509-99F5-CCD4D97E4023 |
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treatment provided by |
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scientific name |
Microichthyurus tertius Y. Yang, Liu & X. Yang |
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sp. nov. |
Microichthyurus tertius Y. Yang, Liu & X. Yang sp. nov.
Figs 7 D View Figure 7 , 8 D View Figure 8 , 9 D View Figure 9 , 11 C, D View Figure 11 , 12 E ‒ H View Figure 12 , 13 C, D View Figure 13
Etymology.
The specific name is derived from the Latin tertius (third), referring to its distinctive antennomere III.
Type material.
Holotype. China ‒ Yunnan Prov. • ♂; Dali, Jizushan ; 25.9574°N, 100.3899°E; 25-VII-2023; C. Fang & J. B. Tong leg.; MHBU. GoogleMaps
Paratypes. China ‒ Yunnan Prov. • 6 ♂♂ 2 ♀♀; same data as holotype; MHBU GoogleMaps .
Diagnosis.
The species resembles M. niger sp. nov. in the general shape of abdominal sternite VIII of male and aedeagus but can be easily distinguished from the latter by the following characters: basal antennomeres distinctly cylindrically thickened in male (Fig. 11 C View Figure 11 ); abdominal sternite VIII of male (Fig. 8 D View Figure 8 ) with lateral portions well delimited and keeled along inner margins, middle portion slightly narrowed posteriorly; aedeagus with right paramere beak-shaped at apex, median lobe with one protrusion (Fig. 12 E, H View Figure 12 ). Unlike in M. niger sp. nov., basal antennomeres moderately cylindrically thickened in male (Fig. 11 A View Figure 11 ); abdominal sternite VIII of male (Fig. 8 C View Figure 8 ) with lateral margins never ridged along inner margins, middle portion slightly widened posteriorly; aedeagus with right paramere acute at apex (Fig. 12 A, D View Figure 12 ), median lobe with two protrusions.
Description.
Body length (both sexes): 5.0‒ 6.5 mm (5.2 mm in holotype); body width (both sexes): 1.0‒ 1.1 mm (1.1 mm in holotype).
Male (Fig. 11 C View Figure 11 ). Coloration. Body black, brown at antennomeres I ‒ IV, coxae, trochanters, and basal 1 / 3 parts of femora, as well as margins of abdominal segments II ‒ VI.
Eyes large, interocular distance about half as wide as diameter of an eye. Antennae extending to posterior margin of abdominal tergite III, antennomeres I ‒ IV cylindrically thickened, III longest, I slightly shorter than III, II shortest and about 1 / 3 length of III, IV ‒ VII subequal in length and about 2 / 3 length of III, VIII ‒ XI subequal in length and slightly shorter than VII.
Pronotum 1.1 times wider than length, anterior margin and posterior margin slightly arcuate, lateral margins parallel, anterior angles and posterior angles rounded. Elytra 1.4 times longer than wide, 1.8 times longer than pronotum, with lateral margins subparallel, sutures slightly dehiscent from the base, distance between sutures wider than the width of the elytron, apices rounded.
Abdominal tergite VIII (Fig. 7 D View Figure 7 ) as long as wide, with lateral margins slightly arcuate, postero-lateral projections about half length of the tergite and straight at inner margins. Abdominal sternite VIII (Fig. 8 D View Figure 8 ) trilobed, with lateral portions converging posteriorly to each other, slender and about 4.0 times as long as basal width, acute at apex, well delimited and keeled along inner margins, inner apical angles feebly projecting and rounded; middle portion 1.2 times longer than wide, slightly narrowed posteriorly, tapered at posterior margin, and rounded at latero-apical angles. Proctiger (Fig. 9 D View Figure 9 ) weakly sclerotized and about half length of paraproct. Paraproct (Fig. 9 D View Figure 9 ) semicircular and obviously bordered around all margins, posterior covered with a few long pubescence around posterior margin (with tergal flange destroyed).
Aedeagus (Fig. 12 E ‒ H View Figure 12 ): left ventral paramere slender and nearly straight in dorsal and ventral views (Fig. 12 E, H View Figure 12 ), sharply hooked at apex, strongly bent inwards and near parallel; left dorsal paramere extremely short and lamellar, about half length of left ventral paramere, rounded at apical margin (Fig. 12 E View Figure 12 ); right paramere about 4 / 5 length of left ventral paramere, slender and nearly straight in dorsal and ventral views, largely hooked and beak-like at apex (Fig. 12 E ‒ H View Figure 12 ); median lobe as long as parameres, moderately sclerotized, grooved at basal part, cone-shaped at apical part, distinctly protruding on latero-apical portion, the projection slender, bent, and acute at apex (Fig. 12 E, H View Figure 12 ).
Female (Fig. 11 D View Figure 11 ). Similar to males, but body larger, antennae simple and filiform, I ‒ II yellow ventrally and black. Abdominal tergite VIII (Fig. 13 C View Figure 13 ) 1.1 times longer than wide, with lateral margins arcuate at base, lateral projections about 1 / 3 length of the tergite, and slightly sinuate at inner margins. Abdominal sternite VIII (Fig. 13 D View Figure 13 ) about 1.1 times longer than wide, with lateral margins slightly converging posteriorly, posterior margin straight in middle, and latero-apical angles rounded.
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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