Borysthenes mysterius, Lyu, 2025
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publication ID |
https://doi.org/10.11646/zootaxa.5665.1.4 |
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publication LSID |
lsid:zoobank.org:pub:AE69B232-FCCA-40CC-B6F7-73EA43D06822 |
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DOI |
https://doi.org/10.5281/zenodo.16608792 |
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persistent identifier |
https://treatment.plazi.org/id/03CECD46-6B54-5D4C-FF14-F8B41E412593 |
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treatment provided by |
Plazi |
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scientific name |
Borysthenes mysterius |
| status |
sp. nov. |
Borysthenes mysterius sp. nov.
Fig. 1C–D View FIGURE 1 , 2I–P View FIGURE 2
Materials examined: Holotype: ♂ (Ho-017485), Heiling , Mt. Jianfengling, Hainan Island, China (中国¾南ẑ尖 Ṟėāė), 9.xi.1983, leg.: Zhenyao Chen (ḴṀȃ).
Diagnosis: This species can be distinguished by the following combined characters: a) Tegmina with coastal cell dark-colored except the light-colored narrow strip along Sc+RA, and an H-shaped dark marking, second r-m light-colored, b) male pygofer with caudal margin of lateral lobes having a sharp process, c) male anal segment with right ventrolateral margin with extremely long extension, d) aedeagus with two ventral processes sharing a common stem.
Description. Body length: 7.3mm (male, n=1).
Coloration: generally brown ( Fig. 1C–D View FIGURE 1 ). Tegmina with coastal cell dark-colored except the light-colored narrow strip along Sc+RA; a banded dark marking extending from base of RA to icua along the nodal line, connected with another banded dark marking extending from apex of RA to CuA2 through darkened C3, together forming an H-shaped marking; apical margin clouded with dark suffusion, extending from RP1 to at least CuA1. Longitudinal viens darkened at areas covered by these markings, major portion of second m-cu light colored.
Structures. Head and thorax: compound eyes well developed. Tegmina with RP and Sc+RA share a common stem. Hindwing with RP bifurcate.
Male genitalia ( Fig. 2I–P View FIGURE 2 ). Pygofer ( Fig. 2O–P View FIGURE 2 ) generally symmetrical, longer than wide. In lateral view, lateral lobes with a sharp process, at the level below the midpoint; lower 3/4 of upper slope of caudal margin bares setae. From ventral view, medioventral process short and stout, shorter than width at base.
Anal segment ( Fig. 2M View FIGURE 2 ) generally oval from dorsal view, with two caudal processes shot and rounded. From lateral view strongly asymmetrical, with right ventrolateral extension extremely long, about 3 times the length of left ventrolateral extension, slightly curved cephalically.
Aedeagus ( Fig. 2J–L View FIGURE 2 ) with 5 processes, all visible from left and right lateral view.At left of apex, a long, curved process arise near the base of endosoma, first directed cephalically but soon curved rightward, and eventually pointing cephalically; below it, a short and slender process arise from the endosoma, pointing cephalically; at right of apex, a shorter process curved leftward and downward, eventually pointing ventrocephalic; two ventral processes share a common stem arising near the apex and directed ventrocephalic, the right process curved upward after diverging from the common stem, while the left one slightly curved rightward, pointing cephalic.
Gonostyli ( Fig. 2N View FIGURE 2 ) symmetrical, expand towards apex. From lateral view, apex truncate. From dorsal view, apical expansions extend outward, caudal margin rounded.
Remarks: This species is s omewhat similar to B. xuzhiae sp. nov., see remarks on the latter.
The male genitalia of B. mysterius sp. nov. is also similar to that of B. fatalis Emaljanov (1989) from Vietnam. The type of B. fatalis have not been examined, but the original description and illustration of the male genitalia was comprehensive. B. mystherius sp. nov. can be distinguished from the latter by: a) lateral lobes of pygofer with sharp processes, upper slope straight (in B. fatalis , lateral lobes with irregularly blunt projections, upper slope strongly concave), b) male anal segment with two lateral margins of similar length from dorsal view, right lateroventral margin extended ventrally, much longer than the left one (in B. fatalis , right lateral margin shorter from dorsal view, right ventrolateral margin slightly extended ventrally, folded cephalic), c) aedeagus with 5 sharp processes, no flat ventral projection at the middle of periandrium (in B. fatalis , aedeagus with 4 apical sharp processes and a flat ventral projection at the middle of periandrium).
B. mysterius sp. nov. is described by a single male specimen preserved in SYSBM, having unique tegmina markings and male genitalia structure, thus designated here as a separate species. Four field surveys have been conducted recently at Mt. Jianfengling, the type locality of this species, but no Borysthenes species were collected .
Distribution: Hainan Island (Mt. Jianfengling)
Etymology: The specific epithet comes from the Latin word “ mysterius ”, indicating the rarity and mysterious nature of this species. The epithet is a masculine adjective.
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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