Borysthenes delicatus, 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/03CECD46-6B56-5D4D-FF14-F9501FD524FD |
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treatment provided by |
Plazi |
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scientific name |
Borysthenes delicatus |
| status |
sp. nov. |
Borysthenes delicatus sp. nov.
Fig. 1G–H View FIGURE 1 , 2Q–X View FIGURE 2 , 4C–E View FIGURE 4 , 6E View FIGURE 6
Materials examined: Holotype: ♂, Xishuangbanna Botanical Garden , Menglun, Dai Autonomous Prefecture of Xishuangbanna, Yunnan Province, China (中国云南Ʊ双åae勐Ĕüä园), 1.ix.2023, leg: Tianlang Lyu.
Paratypes: 1♂ 4♀, same data as holotype
Diagnosis: This species can be distinguished by the following combined characters: a) body whitish, with dark spotted markings on tegmina, b) tegmina with coastal cell divided by a dark elongate spot in the middle, c) male anal segment flat, without lateroventral extensions, d) aedeagus with 4 processes.
Description. Body length: 5.9–6.0mm (male, n=2), 6.2–6.7mm (female, n=4).
Coloration: Generally yellowish white ( Fig. 1G–H View FIGURE 1 , Fig. 6E View FIGURE 6 ), torso and legs generally concolor, yellowish white, except the tip of rostrum, black. Tegmina yellowish white, with scattered dark spots. Basal cell with darkened outer margin; coastal cell divided by an elongated dark spot in the middle, concave, before the level of nodal line; nodal line darkened, with a spot on RP and another spot on CuA; second m-cu covered with a lighter brown spot; a lighter brown clouded spot extending from stigmal cell to the fork point of RP1+2 and RP3+4, with vague margin; at the same level, a lighter brown strip extend from im to CuA; further distally, a dark spot on second r-m; a dark spot on the veinlet between MP1 and MP2.
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. 2Q–X View FIGURE 2 ). Pygofer ( Fig. 2W–X View FIGURE 2 ) generally symmetrical. From lateral view, caudal margin of lateral lobes with truncate apex, smooth, without sharp angle; middle portion of caudal margin bares setae. From ventral view, medioventral process short and stout, with subrounded apex.
Anal segment ( Fig. 2U View FIGURE 2 ) generally symmetrical, slightly longer than wide. From dorsal view, expand towards apex, with rounded caudal margin. From lateral view flat, without ventrolateral extensions.
Aedeagus ( Fig. 2R–T View FIGURE 2 ) laterally compressed, with 4 processes, all visible from left and right lateral view. At upper point of apex, a strong process arises from slightly rightward and directed cephalic, abruptly becomes slender from two thirds; a shorter process arises from the apex and directed dorsocephalic, abruptly becomes slender at basal one third; at lower position of the apex, a long and slender process directing ventrocephalic, eventually curved dorsally; at midpoint of periandrium, a ventral process curved ca. 180 degrees, pointing caudally.
Gonostyli ( Fig. 2V View FIGURE 2 ) symmetrical. Ventral margin smoothly curved, without prominent keel. Apical lobes from lateral view without dorsal prominence, rounded; in dorsal view slightly inflexed backward, moderately extended from stem. Inner margin bares thick setae.
Female genitalia ( Fig. 4C–E View FIGURE 4 ): Ovipositor straight and thin, gonapophysis IX with a small dorsal prominence at ca. 1/5 from apex. Posterior vagina ( Fig. 4D–E View FIGURE 4 ) bilaterally compressed, sclerotization incomplete, with a small patch of sclerotization on the right near gonoporus, inward with another small patch of sclerotization on the vaginal wall cephalically, dorsally with a large sclerotization extending towards the base of bursa copulatrix. Bursa copulatrix duct dorsocaudal to vagina. Ductus receptaculi ventral to vagina, not twisted into a helix.
Remarks: This species is somewhat similar to B. pantherinus sp. nov., having similar tegmina markings and both having aedeagus ventral process arise away from apex of periandrium, but can be distinguished from the latter by: a) B. delicatus is smaller and more delicate in general, b) anal segment flat, lateral margin without ventral extension (anal segment of B. pantherinus with lateral margins extending ventrally), c) aedeagus with 4 processes ( B. pantherinus has 5 aedeagus processes), d) apical lobes of gonostyli not strongly extended caudally, without dorsal prominence ( B. pantherinus with apical lobes of gonostyli strongly extended caudally, with dorsal prominence).
The male genitalia of B. delicatus is also similar to that of B. fatalis Emljanov (1989) , distributed in Vietnam, both having 4 aedeagus processes, and with aedeagus ventral process arise slightly away from apex of periandrium. B. delicatus sp. nov. can be distinguished from B. fatalis by: a) anal segment with rounded caudal margin from dorsal view, without ventrolateral lobes ( B. fatalis has caudal margin of anal segment emarginated in the middle from dorsal view, with right ventrolateral lobe folded cephalic), b) aedeagus with an apical process pointing dorsally ( B. fatalis without such apical process), c) aedeagus with a long and slender process arise from apex, extending ventrocephalic (no such apical process in B. fatalis ).
Habitat and behavior: This species is recorded in Xishuangbanna Botanical Garden, Menglun, Yunnan Province. Two surveys were conducted on two consecutive days in the “Lvshilin” scenic area, where the karst landform and rainforest are developed. The first survey was conducted from afternoon to night. At dusk, B. delicatus were first recorded on rock surfaces and vegetation around limestone crevices. After sunset, B. delicatus can be frequently found on understory vegetation. They exhibited a rather abrupt transition from invisible to very common around the forest understory at some point during dusk. During the second survey the next morning, B. delicatus was not found except for a single individual found dead.
Distribution: Yunnan (Xishuangbanna).
Etymology: The specific epithet comes from the Latin word ‘ delicatus’, referring to the delicate appearance 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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