Borysthenes opacus, 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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persistent identifier |
https://treatment.plazi.org/id/03CECD46-6B5B-5D46-FF14-FE9C184426CB |
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treatment provided by |
Plazi |
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scientific name |
Borysthenes opacus |
| status |
sp. nov. |
Borysthenes opacus sp. nov.
Fig. 1I–J View FIGURE 1 , 3I–P View FIGURE 3 , 5A–B View FIGURE 5 , 6B View FIGURE 6
Materials examined: Holotype: ♂, entrance of a cave near Biyange , Yanshan Dist., Guilin, Guangxi Province, China (中国ḞƱIJḦDƜ区ḋǟdzmñAEËƛ口), 4.vi.2023, leg.: Tianlang Lyu.
Paratypes: 2♀, same data as holotype .
Diagnosis: This species can be distinguished by the following combined characters: a) Tegmina with coastal cell darken at base, divided by a dark spot in the middle, b) male anal segment with hind margin strongly emarginate, c) aedeagus with 5 processes, endosoma with a single process.
Description. Body length: 6.1mm (male, n=1), 6.8–6.9mm (female, n=2).
Coloration: Head and thorax yellow to light brown, fore and middle legs dark brown, hind leg lighter brown. tip of rostrum black. Tegmina in large covered with dark markings ( Fig. 1I–J View FIGURE 1 , Fig. 6B View FIGURE 6 ). Basal one third of coastal cell, base of Sc+R, RP and MP and clavus covered with V-shaped clouded dark marking. A bifurcate dark marking in the middle of tegmina, starting from coastal margin, with one branch connecting icua and another connecting second m-cu, first m-cu almost entirely covered by this marking. Further distally, a dark band extending from terminal of RA at coastal margin to CuA1, interrupted by the pseudo vein between RP and MP. Apical margin suffused with clouded dark marking. Abdomen dark brown to black.
Structures: Head and thorax: compound eyes well developed. Tegmina with RP and Sc+RA share a common stem, RP with 4 terminals. Hindwing with RP bifurcate.
Male genitalia ( Fig. 3I–P View FIGURE 3 ): Pygofer ( Fig. 3O–P View FIGURE 3 ) symmetrical, tightened ventrally. From lateral view, caudal margins of lateral lobes with truncate apex, angulate, with lower corner extending further caudally than the upper one; baring setae. From ventral view, medioventral process of moderate length, apex somewhat rounded.
Anal segment ( Fig. 3M View FIGURE 3 ) slightly asymmetrical, about as long as wide. From dorsal view, widen towards apex; caudal margin strongly concave, length of concavity longer than half the total length of anal segment. From lateral view, ventrolateral margins moderately expanded, ventral margin at the same level except a small, subrounded prominence at the apex of right ventrolateral margin, extending ventrally.
Aedeagus ( Fig. 3J–L View FIGURE 3 ) with 5 processes, all visible from dorsal and ventral view. At left of the apex, a rather straight process pointing ventrocephalic. Below it, a longer process first directed ventrocephalic, then curved leftward. A short process raised from the apical margin of endosoma, curved rightward and downward. Left of the periandrium, a process raised slightly away from the apex, directing cephalic and curved downward. In ventral side, a strong process raised slightly away from the apex, directing cephalic and then curved rightward and upward.
Gonostyli ( Fig. 3N View FIGURE 3 ) symmetrical. Ventral margin smoothly curved, without prominent keel angle. Apical lobes rounded, each with a small prominence a base. Inner margin covered with setae.
Female genitalia ( Fig. 5A–B View FIGURE 5 ): Ovipositor gently curved. Posterior vagina with caudal portion of both ventral and dorsal walls strongly sclerotized, structure as shown in Fig. 5B View FIGURE 5 . Bursa copulatrix duct cephalad to vagina. Ductus receptaculi cephalad to vagina, not twisted into a helix.
Remarks: This species similar to B. acuminatus Fennah (1956) , distributed in Hubei Province, China. These two species have almost identical tegmina markings, but can be distinguished from the latter by a) aedeagus without dorsal process curved for ca. 180 degrees ( B. acuminatus with aedeagus having a dorsal process curved for ca. 180 degrees, pointing caudally), b) endosoma with only one short process ( B. acuminatus with apical margin of endosoma having trifurcate process). Because female of B. acuminatus are currently unknown, they can only be distinguished using male genitalia structures.
Habitat: This species was collected from almost the same location as B. pantherinus sp. nov., on rock surface and shade plants at a cave entrance in Guilin, Guangxi Province ( Fig. 6A View FIGURE 6 ).
Distribution: Guangxi (Guilin).
Etymology: The specific epithet comes from Latin, indicating “shaded”, indicating both the dense dark marking on tegmina and the shaded habitat where this species was collected. 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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