Strigamia dianguiensis Jiang & Yu, 2025

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 dianguiensis Jiang & Yu sp. nov.

Figs 1 I , 9

Material examined.

Holotype. China • ♀ ( CMMI 20201021120 ), Yunnan Province, Chuxiong Yi Autonomous Prefecture, Lufeng County, Yipinglang Town ( 25.1592°N, 101.9050°E), 1700 m asl., 21. x. 2020, leg. Chao Jiang & Zhidong Wang .

Other materials.

China • 1 ♀ ( CMMI 20250802029 ), Yunnan Province, Dali Bai Autonomous Prefecture, Yangbi Yi Autonomous County, Mt. Laoheshangshan ( 25.6735°N, 99.9639°E), 1570 m asl., 2. viii. 2023, leg. Xuankong Jiang, Yuan Xiong & Yifei Yu . – Guangxi Zhuang Autonomous Region • 1 ♀ ( CMMI 20231223001 D ), Leye County, Tongle Town, Niuping Village ( 24.7775°N, 106.5238°E), 920 m asl., 23. xii. 2023, leg. Chao Jiang .

Diagnosis.

Body length reaching at least 36 mm; number of leg-bearing segments usually 51; with transverse suture on the cephalic plate; cephalic pleurite evidently with sparse setae; with 36 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 truncated; internal and external margins of the forcipular tarsungulum gradually converging all along the tarsungulum; calyx of poison gland ca. 1.6 times as long as wide, situated in the distal half of trochanteroprefemur; metasternites with very dense setae of various sizes, without a 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 12 on each coxopleuron; the most posterior coxal pore on each coxopleuron distinctly displaced from all other pores.

Description.

General features. Body 36 mm long; with 51 leg-bearing segments; narrowing forward and towards the posterior tip. Color (in ethanol 75 %) shallow orange; forcipules darker.

Cephalic capsule (Fig. 9 A, C ) sub-quadratic; ca. 1.2 times as wide as long; all margins convex; areolation uniform on the entire surface, less sclerotized along an indistinct 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. 9 B ) almost uniform in width; ca. 3.1 times as long as the width of the head. Basal articles only slightly more elongated (article II ca. 1.3 times as long as wide); distal articles stouter (article XIII ca. 1.0 times as long as wide); article XIV ca. 1.5 times as long as wide. Setae gradually denser and shorter from the basal articles to the distal ones. Articles I – XIII with three basal whorled long setae along with numerous short setae; remaining articles equipped solely with short setae.

Mandible (Fig. 9 D ) with a single pectinate lamella with ca. 36 hyaline teeth.

First maxillae (Fig. 9 E ). Coxosternite entire; uniformly areolate; without lappets; 2 + 1 setae on anterior middle part. Coxal projection sub-triangular; wider than long; ventral side with 3 + 3 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 3 + 3 long setae and 2 + 2 short setae on distal half; dorsal surface with numerous small sensilla on distal half.

Second maxillae (Fig. 9 E ). Coxosternite entire; uniformly areolate; anterior margin deeply concave; 3 + 3 small 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. 9 F ). Tergite sub-trapezoid; with lateral margins convex and subparallel; ca. 2.7 times as wide as long. Coxosternite ca. 1.7 times as wide as long on exposed part; anterior margin moderately projecting with respect to its condyles; anterior border approximately straight medially; coxopleural sutures strongly converging backward. Trochanteroprefemur ca. 1.2 times as wide as long; basal distance between trochanteroprefemora ca. 0.4 times of their basal breadth. Forcipular intermediate articles with slight 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. 0.3 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. 1.6 times as long as wide, situated in the distal half of trochanteroprefemur.

Leg-bearing segments (Fig. 9 G ). Tergite 1 wider than metatergite 2; lateral margins converging backward. Metasternites sub-rectangular; with very dense 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 / 3 of the length of the tarsus.

Ultimate leg-bearing segment (Fig. 9 H, I ). Pretergite and intercalary pleurites separated by distinct sulcus; pretergite ca. 5.2 times as wide as long on exposed part. Metatergite ca. 1.9 times as wide as long; sub-trapezoid. Metasternite sub-trapezoid; ca. 1.6 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 12–14 on each coxopleuron; opening independently; all coxal pores distinctly aggregated close to the lateral margins of the metasternite, with the possible exception of a single pore on each coxopleuron; diameter of the coxal pores similar to that of the respective ducts; ventral of the coxopleuron with sparse setae. Ultimate leg ca. 0.9 times as long as penultimate leg, with dense setae on ventral and lateral sides. Ultimate pretarsus a claw; ca. 0.2 times as long as tarsus.

Postpedal segments (Fig. 9 H ). Female: intermediate sternite indistinct, medially not exposed; first genital pleurosternite ca. 2.8 times as wide as long, posterior margin slightly concave, uniformly with sparse setae; gonopods lamina bilobate, with sparse setae; anal pores indistinct.

Etymology.

The specific epithet refers to the distribution of this species in Guangxi and Yunnan. “ Dian ” is a traditional name for Yunnan, and “ Gui ” for Guangxi. We suggest the Chinese common name as “ 滇桂地蜈蚣 ”.

Remarks.

The new species exhibited morphological similarities to S. svenhedini ( Verhoeff, 1933) , but can be distinguished by its higher number of, and longer, sternal setae, distinct basal denticle morphology on the tarsungulum, and discrete openings of coxopleural pores, rather than the clustered arrangement observed in S. svenhedini ( Verhoeff 1933: fig. 16).

Distribution.

China ( Guangxi Zhuang Autonomous Region and Yunnan Province).

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 9. Strigamia dianguiensis sp. nov., holotype. A. Head and anterior trunk segments, dorsal (most part of antennae, legs omitted); 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 right part omitted); H. Posterior end of body in adult female, ventral (setae on left coxopleuron and ultimate leg omitted); I. Ditto, dorsal; J. Sternum of leg-bearing segment, ventral. Areolation drawn in part in A, C, E. Specimens: Strigamia dianguiensis sp. nov. (A – I); S. svenhedini (J). Scale bars: 250 μm (A, F – I); 100 μm (B – E, J).