Corallocoris xishaensis Luo, Wang & Chen, 2022

Luo, Jiu-Yang, Wang, Yan-Hui, Chen, Ping-Ping & Xie, Qiang, 2022, First record of the intertidal dwarf bug family Omaniidae from China, with description of a new species (Heteroptera: Leptopodomorpha), Zootaxa 5195 (5), pp. 449-467 : 464-465

publication ID	https://doi.org/ 10.11646/zootaxa.5195.5.4
publication LSID	lsid:zoobank.org:pub:9238817E-3772-4CDF-9B50-045F456050E0
DOI	https://doi.org/10.5281/zenodo.7223781
persistent identifier	https://treatment.plazi.org/id/FFEBDBCB-050D-4742-85B3-2409D5F2E9BF
taxon LSID	lsid:zoobank.org:act:FFEBDBCB-050D-4742-85B3-2409D5F2E9BF
treatment provided by	Plazi
scientific name	Corallocoris xishaensis Luo, Wang & Chen
status	sp. nov.

Treatment

Corallocoris xishaensis Luo, Wang & Chen , sp. nov.

http://zoobank.org/ FFEBDBCB-050D-4742-85B3-2409D5F2E9BF

( Figs. 1–5 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 , 6 View FIGURE 6 , 9 View FIGURE 9 )

Type material. Holotype (♂) CHINA: Hainan Province, Sansha Prefecture, Xisha, Lingyang Jiao Reef : 16°28'03"N, 111°35'58"E, 0 m.a.s.l., 2019-XI-12, leg. Jiu-Yang LUO, mounted on card ( SYSBM) GoogleMaps . Paratypes: same data as holotype, mounted on cards (5♂♂, 3♀♀, SYSBM) GoogleMaps ; same data as holotype, mounted on cards (1♂, 1♀, RMNH) GoogleMaps ; CHINA: Hainan Province, Sansha Prefecture, Xisha, Lingyang Jiao Reef : 16°28'03"N, 111°35'58"E, 0 m.a.s.l., 2019-XI-12, leg. Yan-Hui WANG, mounted on card (4♂♂, 8♀♀, SYSBM) GoogleMaps ; CHINA: Hainan Province, Sansha Prefecture, Xisha, Yongxing Dao : 2019-IV-18, leg. Qiang XIE, mounted on cards (1♂, SYSBM) .

Diagnosis: Corallocoris xishaensis sp. nov. is similar to C. marksae in size and habitus, but it can be distinguished from the latter species by following characteristics: (1) body greyish-black, without distinct grey fascia on the the middle of forewing ( Fig. 1A–B, D–E View FIGURE 1 ), (body nearly black, with a transverse grey fascia near the middle of forewing in latter species [ Fig. 7A–B, F View FIGURE 7 ]); (2) cephalic trichobothria pairs 1 and 2 subequal in length with pair 3 ( Fig. 1B, E View FIGURE 1 ), (distinctly shorter than pairs 3 in latter species [ Fig. 7B View FIGURE 7 ]); (3) the coxae are yellowish-brown, entire trochanters and femora, except for subapices, are whitish-yellow ( Fig. 1B–C, E–F View FIGURE 1 ), (coxae, entire trochanters and femora, except for apices, are dark-brown in latter species [ Fig. 7B–C View FIGURE 7 ]); (4) the proepisternum is whitish-yellow ( Fig. 1B–C, E–F View FIGURE 1 ), (the proepisternum is nearly black in latter species [ Fig. 7B–C View FIGURE 7 ]); (5) the pygophore is round in caudal view ( Fig. 5D View FIGURE 5 ), (pygophore is high in caudal view in latter species [ Fig. 5M View FIGURE 5 ]); (6) the paramere is curved near the middle ( Fig. 5H–J View FIGURE 5 ), (the paramere is slightly curved near the middle in latter species [ Fig. 5P View FIGURE 5 ]).

Description: Size: Male, length 1.13–1.22 mm, greatest width 0.54–0.59 mm; female, length 1.24–1.38 mm, greatest width 0.63–0.70 mm. Color and body surface: Body and collum-like area of head greyish-black and dull ( Fig. 1A–E View FIGURE 1 ); most of head and abdomen black; eyes red, ocelli dark red; elevated spots on head whitish-yellow; antennal segment I whitish-yellow, segment II slightly darker than segment I, and darkening from base to apex, segment III and IV blackish-brown, segment III slightly lighter than segment IV; labrum and labium light-brown to brown, apex of labial segment IV blackish-brown; pronotum, scutellum and upper surface of forewing with moderately dense, semierect brown setae ( Fig. 1A, D View FIGURE 1 ); apical portion and hypocostal lamina of forewing yellowishbrown to dark-brown ( Fig. 1B, E View FIGURE 1 ); proepisternum whitish-yellow; coxae yellowish-brown, entire trochanters and femora except for subapices whitish-yellow; tibiae and tarsi whitish-yellow, with blackish-brown distal end. Most of head with dense, relatively thin, silver setae ( Figs. 3A–B View FIGURE 3 , 4A View FIGURE 4 ); collar of head, surface of thorax and upper surface of forewing with dense, grey microtrichia ( Fig. 4A–B View FIGURE 4 ), lower surface of forewing with dense, short microtrichia ( Fig. 3F–H View FIGURE 3 ); antennae, labium, legs and abdomen with moderately dense, silver setae ( Fig. 2B, E, H–J View FIGURE 2 ).

Brachypterous male. Structures: Body oval. Body length 2.03–2.09× greatest width. Head. Wider than long, greatest width across eyes 2.63–2.85× median length, with three pairs of black cephalic trichobothria, two pairs on vertex behind ocelli, and one pairs arising from light, elevated spots before ocelli ( Figs. 2B, E View FIGURE 2 , 3B View FIGURE 3 , 4A View FIGURE 4 ), cephalic trichobothria pairs 1 and 2 subequal in length with pair 3 ( Fig. 1B, E View FIGURE 1 ); eyes large, width of eyes 1.14× vertex width of across ocelli, with three pairs of dark-brown trichobothria ( Figs. 2B, E View FIGURE 2 , 4A View FIGURE 4 ), trichobothria on eyes shorter and thinner than cephalic trichobothria; antennal length subequal to body width; segments I and III subequal in length; segment I thickest and segment IV longest ( Fig. 2B, E View FIGURE 2 ); ratio of antennal segments I to IV = 1: 1.36: 1.10: 1.71. Apex of labium reaching to hind coxa ( Fig. 1B–C, E–F View FIGURE 1 ); labial segment I widest, subequal to segment II in length, segment III longest, ratio of labial segments I to IV = 1.28: 1: 3.59: 2.69. Thorax. Pronotum short and trapezoid ( Figs. 2B View FIGURE 2 , 3A View FIGURE 3 ), median length about 0.5× humeral width; collar distinct, narrower than posterior lobe; anterior lobe elevated and deeply concave at fovea ( Figs. 2B View FIGURE 2 , 3A, D View FIGURE 3 , 4A, C View FIGURE 4 ); with three pairs of black pronotal trichobothria ( Figs. 2B View FIGURE 2 , 3D View FIGURE 3 ); scutellum triangular, wider than long, ratio of length / width = 1: 1.44; lateral margin of scutellum with small concavity centrally ( Figs. 2A View FIGURE 2 , 3A, E View FIGURE 3 ); middle of scutellum base ridge-like, longitudinally convex ( Fig. 2A View FIGURE 2 ); mesosternum with two small sub-transverse ridges ( Fig. 4E–F View FIGURE 4 ), metasternum with high middle longitudinal ridge ( Fig. 4E View FIGURE 4 ); forewing with claval and R+M sutures, bases of sutures with deep round pit, R+M suture ends at about two-thirds of forewing, claval suture ends at about four-sevenths of forewing ( Fig. 2D View FIGURE 2 ); legs stout, coxae and femora thick, tibiae and tarsi slender; femora and tibiae with thick spines; tarsal formula 3-3-3 ( Fig. 2H–J View FIGURE 2 ); forefemur and middle femur longer than tibia, forefemur about 1.14× length of foretibia, middle femur about 1.16× length of middle tibia; hind coxae with setose area ( Figs. 2J View FIGURE 2 , 4G–H View FIGURE 4 ); hind femur shorter than hind tibia, tibia about 1.18× length of femur.

Pregenital abdomen. Mediotergites less sclerotized than sterna, with broad membranous area ( Fig. 2G, K View FIGURE 2 ); mediotergites V–VII more sclerotized than I–IV; laterotergites less sclerotized than sterna, well-delimited with mediotergites and sterna ( Fig. 2G, H View FIGURE 2 ); laterotergite III expanded, with strongly sclerotized margin ( Fig. 2G View FIGURE 2 ); sterna strongly sclerotized; middle of basal margin of sternum I with cleft; segment VIII cylindrical shaped.

External genitalia. Pygophore cylindrical ( Fig. 5A–D View FIGURE 5 ), posterior area of venter expanded ( Fig. 5B View FIGURE 5 ); with parandria protruding posterior margin of genital capsule opening ( Fig. 5B View FIGURE 5 ); parameres club-shaped, with slender and distally curved bases ( Fig. 5H–J View FIGURE 5 ); articulatory apparatus sclerotized ( Fig. 5E–G View FIGURE 5 ); ligamentous processes with wide base ( Fig. 5E View FIGURE 5 ); caudal side of phallotheca with swellings ( Fig. 5E View FIGURE 5 ); more than half of endosoma with spicule ( Fig. 5E–F View FIGURE 5 ).

Brachypterous female. Structures: Similar to male, except for the following: Body length 1.94–2.00× greatest width. Head. Greatest width across eyes 2.63–2.90× median length; width of eyes 1.22× vertex width of across ocelli; ratio of antennal segments I to IV = 1: 1.42: 1.10: 1.82; ratio of labial segments I to IV = 1.06: 1: 2.91: 2.29. Thorax. Pronotum short and trapezoid, median length about 0.47× humeral width; forefemur about 1.16× length of foretibia.

Pregenital abdomen. Laterotergite III normally developed.

External genitalia. Gynatrium ellipsoidal; spermatheca oval; accessory canal more sclerotized ( Fig. 5K–L View FIGURE 5 ).

Measurements see Table 1 View TABLE 1 .

Etymology: The specific epithet refers to the type locality area, the Xisha Islands in the South China Sea; adjective.

Biology: Specimens of Corallocoris xishaensis sp. nov. were collected in the intertidal zone. They spend periods submerged by high tides in rock crevices and then emerge at low tide, and were frequently found in crevices and holes of coral rocks ( Fig. 6A–B View FIGURE 6 ).

Distribution: This species is so far known only from Lingyang Jiao and Yongxing Dao, Xisha Islands in the South China Sea ( Figs. 9A–B View FIGURE 9 ; Table 3 View TABLE 3 ).