Strigamia korsosi Bonato, Bortolin, Drago, Orlando & Dányi, 2017

Yu, Yifei, You, Chunxue & Jiang, Chao, 2025, Taxonomy of the Strigamia centipedes from the East Asian mainland (Geophilomorpha, Geophilidae), Zoosystematics and Evolution 101 (4), pp. 2065-2101 : 2065-2101

Strigamia korsosi Bonato, Bortolin, Drago, Orlando & Dányi, 2017

Figs 1 F , 7

Strigamia korsosi Bonato, Bortolin, Drago, Orlando, Dányi, 2017 : appendix S 1. 6–10, figs A – J.

Material examined.

China – Anhui Province • 1 ♀ ( CMMI 20250417001 D ), Chuzhou, Langya Mountain, Yujiawa ( 32.2778°N, 118.2950°E), 90 m asl., 17. iv. 2025, leg. Chao Jiang . – Chongqing • 2 ♀♀ ( CMMI 20250510008 D – 009 D), Wuxi County, Yintiaoling Nature Reserve, Hongqi Protection Area, Benzhuping ( 31.2939°N, 109.4843°E), 1580 m asl., 10. v. 2025, leg. Yutong Zhang & Hongyan Zhang . – Fujian Province • 1 ♀ ( CMMI 20240917001 D ), Sanming, Jiangle County, Mt. Longqi, Shangxiantang ( 26.5177°N, 117.3086°E), 830 m asl., 17. ix. 2024, leg. Chao Jiang . – Henan Province • 1 ♀ ( CMMI 20250331014 ), Pingdingshan, Yinji Town, Chengchuigou , ( 33.1821°N, 113.5907°E), 280 m asl., 31. iii. 2025, leg. Chao Jiang & Jing Zhong . – Jiangxi Province • 2 ♀♀ ( CMMI 20230316044 –045), Jiujiang, Xunyang Dist., Nanhu Park ( 29.7119°N, 115.9986°E), 30 m asl., 16. iii. 2023, leg. Chao Jiang . – Jiangsu Province • 1 ♂ ( CMMI 20200825114 ), Nanjing, Mt. Fangshan ( 31.8953°N, 118.8760°E), 120 m asl., 25. viii. 2020, leg. Chao Jiang ; • 1 ♀ ( CMMI 20201214102 ), Nantong , 14. xii. 2020, leg. Quanyu Ji ; • 1 ♀ ( CMMI 20230511003 D ), Suzhou, Mt. Qionglongshan ( 31.2653°N, 120.4237°E), 160 m asl., 11. v. 2023, leg. Chao Jiang . – Zhejiang Province • 1 ♀ ( CMMI 20191031044 ), Zhoushan, Dinghai Dist., Mt. Changgangshan ( 30.0355°N, 122.1201°E), 130 m asl., 31. x. 2019, leg. Chao Jiang .

Diagnosis.

Body length reaching at least 20 mm (at least 14 mm long in Bonato et al. 2017); number of leg-bearing segments usually 45–55 (33–37 pairs of leg-bearing segments in Bonato et al. 2017); with transverse suture on the cephalic plate; cephalic pleurite without setae; with 30 pectinate hyaline teeth in the mandible; anterior margin of the second maxillae coxosternite deeply concave; telopodite distinctly longer than coxal projection of the first maxillae; denticle of the tarsungulum sub-triangular, internal and external margins of the forcipular tarsungulum gradually converging all along the tarsungulum; calyx of poison gland ca. 2.0 times as long as wide, situated from femur to distal half of trochanteroprefemur; metasternites with sparse setae of various sizes; metasternites without mid-longitudinal deep sulcus; pore-fields not on the anterior part; distinct sulcus separating pretergite and intercalary pleurites of the ultimate leg-bearing segment; metasternite of the ultimate leg-bearing segment smooth, with no concave on each side; coxal pores at least 16 on each coxopleuron; clustered in two groups, one anterior to the other, each of them inside an indistinct common pit close to the lateral margin of the metasternite.

Description.

General features. Body 20–35 mm long (at least 14 mm long in Bonato et al. 2017); with 45–55 leg-bearing segments (33–37 pairs of leg-bearing segments in Bonato et al. 2017); narrowing forward and towards the posterior tip. Color (in ethanol 75 %) reddish yellow; forcipules darker.

Cephalic capsule (Fig. 7 A, C ) sub-quadratic; ca. 1.1 times as wide as long; all margins convex; areolation uniform on the entire surface, less sclerotized along a distinct transverse suture; setae arranged scattered. Clypeus with rather uniform areolation; sclerotized along the anterior margin and a median triangular area; fading close to the labrum and the paraclypeal sutures; 4 post-antennal setae aligned on the anterior part of the clypeus, grouped in the medial part, and 2 medial prelabral setae on the posterior part of the clypeus. Labrum slightly projecting backwards medially, without distinct mid-piece; marginal denticles absent, with two unordered rows of long slender hyaline filaments along the entire labral margin and further rows of shorter filaments behind.

Antennae (Fig. 7 B ) almost uniform in width; ca. 2.9 times as long as the width of the head. Basal articles only slightly more elongated (article II ca. 1.2 times as long as wide); distal articles stouter (article XIII ca. 0.7 times as long as wide); article XIV ca. 0.8 times as long as wide. Setae gradually denser and shorter from the basal articles to the distal ones. Articles I – XI with distinctly two whorled long setae along with numerous short setae; remaining articles equipped with uniform setae.

Mandible (Fig. 7 D ) with a single pectinate lamella with ca. 30 hyaline teeth.

First maxillae (Fig. 7 E ). Coxosternite entire; uniformly areolate; without lappets; 2 + 2 setae on anterior middle part. Coxal projection sub-triangular; about as wide as long; ventral side with 5 small setae on distal half; dorsal surface with numerous small sensilla on distal half. Telopodite longer than the coxal projection; distinctly articulated; without lappets; ventral side with 2 + 3 long setae and 3 + 3 short setae on distal half; dorsal surface with numerous small sensilla on distal half.

Second maxillae (Fig. 7 E ). Coxosternite entire; uniformly areolate; anterior margin deeply concave, 3 + 4 setae close to the anterior margin. Telopodite composed of three articles; gradually narrowing towards the tip; claws simple; almost straight and gradually tapering on the telopodite.

Forcipular segment (Fig. 7 F ). Tergite sub-trapezoid; with lateral margins convex and subparallel; ca. 3.5 times as wide as long. Coxosternite ca. 2.2 times as wide as long on exposed part; anterior margin moderately projecting with respect to its condyles; anterior border shallow concave medially; coxopleural sutures strongly converging backward. Trochanteroprefemur ca. 1.3 times as wide as long; basal distance between trochanteroprefemora ca. 0.4 times of their basal breadth. Forcipular intermediate articles with slightly projections. Tarsungulum ca. 2.1 times as long as wide. Basal denticle of tarsungulum sub-triangular, with distal margin slightly convex, basal margin quite straight and ca. 0.6 times as long as the basal breadth of the tarsungulum. Distal part of the tarsungulum uniformly tapering, its internal margin uniformly curved moderately concave and converging uniformly to the external margin. Calyx of poison gland ca. 2.0 times as long as wide, situated from femur to distal half of trochanteroprefemur.

Leg-bearing segments (Fig. 7 G ). Tergite 1 wider than metatergite 2; lateral margins converging backward. Metasternites sub-rectangular; with sparse setae of various sizes; without a deeply mid-longitudinal sulcus. Posterior pair of sub-ovoid pore-fields present in all metasternites from 1 to penultimate. Pore-fields present also on all procoxae and metacoxae from 1 to penultimate. Legs 1 smaller than the others; pretarsus claw-like, reaching ca. 1 / 4 of the length of the tarsus.

Ultimate leg-bearing segment (Fig. 7 H – K ). Pretergite and intercalary pleurites separated by distinct sulcus; pretergite ca. 4.0 times as wide as long on exposed part. Metatergite ca. 1.5–1.8 times as wide as long; sub-trapezoid. Metasternite sub-trapezoid; ca. 1.7–1.8 times as wide as long; lateral margins slightly concave to nearly straight, converging backwards; posterior margin ca. 0.3 times as wide as anterior margin; with sparse setae of various sizes. Coxal pores 20–23 ( ♀), 19–21 ( ♂); clustered in two couples on each coxopleuron, one anterior to the other, each of them inside an inconspicuous common pit close to the lateral margin of the metasternite; diameter of the coxal pores similar to that of the respective ducts; setae distinctly denser and shorter on the posterior part of the ventral side of the coxopleuron. Ultimate leg ca. 0.9 times as long as penultimate leg, distinctly swollen, with very dense setae on ventral and lateral sides. Ultimate pretarsus a claw; ca. 0.3 times as long as tarsus.

Postpedal segments (Fig. 7 H, J ). Male: intermediate sternite distinct and exposed; first genital sternite separated from pleurites by distinct sutures; gonopods bi-articulate, with setae; penis conical; anal pores present. Female: intermediate sternite indistinct, medially not exposed; first genital pleurosternite ca. 2.5 times as wide as long, posterior margin slightly concave, uniformly with sparse setae; gonopods lamina bilobate, with sparse setae; anal pores present.

Remarks.

To the best of our knowledge, this is the first report of this species in China. Several larval specimens ( 8–11 mm body length), accompanied by their parents, were collected from Suzhou, Jiangsu Province, and shared diagnostic characteristics with the Japanese species Strigamia monoporus ( Takakuwa, 1938) , including a single large coxal pore per coxopleuron and distal antennal segments twice as long as they are wide, exceeding twice the length of the preceding segment. However, a critical morphological distinction exists in the basal denticle of the forcipular tarsungulum in S. monoporus , which is diminutive and positioned distally to the tarsungular base ( Takakuwa 1938, 1940), in contrast to the morphology observed in the Chinese material. The holotype of S. monoporus ( 10 mm total length) had an antennal morphology consistent with its larval traits, suggesting that it may represent an immature stage, rather than a diagnostically informative adult. Given the limited morphological utility of the holotype, the absence of adult specimens for comparison, and the insufficient original description, we propose that S. monoporus should be treated as a nomen dubium.

Distribution.

China ( Anhui, Fujian, Henan, Jiangsu, Jiangxi and Zhejiang Provinces, Chongqing).

Figures

Figure 1. Forcipular segments of Strigamia spp. (A – M). A. S. svenhedini (Verhoeff, 1933) (spm. CMMI 20220903086); B. S. japonica (Verhoeff, 1935) (spm. CMMI 20231128001 D); C. S. tenuiungulata (Takakuwa, 1938) (spm. CMMI 20230414002 D); D. S. bicolor Shinohara, 1981 (spm. CMMI 20210227106); E. S. platydentata Shinohara, 1981 (spm. CMMI 20210702003 D); F. S. korsosi Bonato, Bortolin, Drago, Orlando, Dányi, 2017 (spm. CMMI 20191031044); G. S. laterisetosa sp. nov., holotype; H. S. longiglanda sp. nov., holotype; I. S. dianguiensis sp. nov., holotype; J. S. obliquidentata sp. nov., holotype; K. S. xizangensis sp. nov., paratype; L. S. ziyunensis sp. nov., holotype; M. S. asiatica sp. nov., holotype. N, O. live specimens of S. laterisetosa (Zhoushan, Zhejiang Province, China; photo by Chao Jiang). Scale bars: 250 μm (A – M).

Figure 7. Strigamia korsosi Bonato, Bortolin, Drago, Orlando, Dányi, 2017. A. Cephalic plate, dorsal; B. Right antenna, ventral; C. Anterior part of cephalic capsule, ventral (forcipules, maxillae and mandibles removed); D. Mandible; E. Maxillary complex, ventral; F. Forcipular segment, ventral (venom canal drawn with dashed lines); G. Sternum of leg-bearing segment, ventral (setae on left part omitted); H. Posterior end of body in adult female, ventral (setae on left coxopleuron and ultimate leg omitted); I. Ditto, dorsal (setae on right coxopleuron and ultimate leg omitted); J. Posterior end of body in adult male, ventral (setae on left coxopleuron and ultimate leg omitted); K. Ditto, dorsal. Areolation drawn in part in A, C, E. Specimens: ♂ (CMMI 20201214102) (A, J, K); ♀ (CMMI 20230316044) (B – I). Scale bars: 250 μm.