Cycloperipsocus stictus Cao & Liu, 2025, sp. nov.
Creators: name: Cao, Leran
name: Liu, Xingyue
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Psocodea
Peripsocidae
Cycloperipsocus
Cycloperipsocus stictus

description: Cycloperipsocus stictus sp. nov.
(Figs 26–29)
Diagnosis. Forewing with markings in cell R and cell CuA fragmented. Postclypeus without stripes. Phallosome gently pointed at apex; Paramere with its tip slightly expanded, inner process present. Lateral lobe of penis bulb expanded into lamellar rather than hemispheric.
Description. Male (Figs 26–27). Coloration (preserved in 95% ethanol). Head: vertex pale brown with dark-colored markings; frons pale brown; gena cream white, bottom 1/3 light brown; postclypeus pale brown, with only a few irregular brown markings along top margin; anteclypeus and labrum brown; maxillary palpus slightly reddish-brown; ocelli cream white with reddish-brown spots, ocellar region cream white; compound eyes black, sometimes with white envelope.Antennae: scape brown; pedicel and flagellum pale taupe. Thorax brown; scutellum, postnotum of mesothorax and scutellum of metathorax pale cream. Legs: coxae brown; fore femora pale cream, mid and hind femora brown but pale cream at both ends; tibiae pale brown, shallowing toward both ends in hind tibiae; fore and mid tarsi light brown, hind tarsi pale cream; pretarsi brown. Wings cream white with taupe markings as in Figs 26C–D; distal half of pterostigma sometimes dark brown; forewing Mb dark gray, markings in cells R and CuA fragmented, a pale spot present at distal margin of cell M2. Pregenital abdominal segments cream, with dark reddish-purple markings on ventral and lateral sides. Terminalia grayish brown.
Morphology. Clunium slightly extended, without any process or serrations. Epiproct semicircular. Paraproct ovoid, inner margin with a small process; posterior lobe ovate; a small piece of sclerite present between paraproct and clunium. Hypandrium simple. Phallosome (Figs 27C–H) basally closed, slightly constricted in the middle; aedeagal arch with apex gently pointed, distal 1/3 hood-like; Paramere slightly expanded at apex, inner process present. Penis bulb consists of a middle thorn and a pair of lateral lobes; lateral lobe expanded into lamellar rather than hemispheric shape, outer margin smooth, inner margin with a spine pointed forward.
Measurements (in μm) (6 males). B: 976–1224, BW: 1578–1726, IO: 114–124, d: 136–150, IO/d: 0.78–0.91, f1: 133–146, FWL: 1304–1492, FWW: 589–635, HWL: 1031–1068, HWW: 393–430, t1: 100–123, t2: 45–60. Number of ctenidia on hind first tarsomere: 9–11.
Female (Figs 28–29). Coloration (preserved in 95% ethanol). Head: vertex milk-white with pale gray markings; frons cream white, with a pale brown area around ocellar region, a pair of indistinct pale brown spots present between postclypeus and compound eyes; gena cream white, bottom 1/3 brown, a reddish-brown spot present rear to compound eye. Antennae: scape brown, pedicel cream white, flagellum pale taupe. Other parts generally same as male.
Morphology. Epiproct and paraproct semicircular. Subgenital plate (Figs 29D–E) with pigmented area V-shaped; pigmented arm strong, apex slightly bifurcate; egg guide short, slightly constricted at base, outer and distal margin folded inward. Gonapophyses (Fig. 29F): ventral valve broadened with membrane in basal half, narrowing toward apex; dorsal valve broad, oblong, about 1.5 times as long as its width, with a row of setae along distal margin; external valve rectangular, about half the length of dorsal valve, slightly setose.
Measurements (in μm) (5 females). B: 1123–1327, BW: 1732–1785, IO: 207–231, d: 71–87, IO/d: 2.63–2.91, f1: 109–115, FWL: 1341–1484, FWW: 564–629, HWL: 1017–1152, HWW: 382–433, t1: 95–114, t2: 47–64. Number of ctenidia on hind first tarsomere: 8–10.
Materials examined. Holotype male, China: Guangxi, Guilin, Longsheng, Sanmen Town, Huaping NNR, Tianpingshan [25°37′53″N, 109°54′50″E], 743 m, 2–5.VIII.2023, Leran Cao (CAU). Paratypes: 6 males, 5 females, same as holotype (CAU). Other specimens: 21 males, 17 females, same as holotype (CAU).
Known distribution. China (Guangxi).
Etymology. The specific epithet is derived from the Greek word stiktos, referring to the fragmented markings in forewing cell R and CuA.
Remarks. This new species is characterized by the fragmented markings in forewing cells R and CuA. This characteristic somewhat resembles C. plurimaculatus but C. stictus can be distinguished by the lack of markings at the end of forewing R4+5 and M1. In addition, C. stictus also differs from all other cycloperipsocids in the male penis bulb with lateral lobe expanded into lamellar rather than hemispheric shape.
description: Published as part of Cao, Leran & Liu, Xingyue, 2025, A review of the bark louse genus Cycloperipsocus Li, 1993 (Psocodea: Peripsocidae) with description of five new species, pp. 201-229 in Zootaxa 5620 (2) on pages 222-225, DOI: 10.11646/zootaxa.5620.2.1, http://zenodo.org/record/15219324