Lagynochthonius infirmus SUN, GUO & ZHANG, 2024, sp. nov.
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| author | SUN, JIANZHOU GUO, XIANGBO ZHANG, FENG |
| author_facet | SUN, JIANZHOU GUO, XIANGBO ZHANG, FENG |
| contents | <p><b><i>Lagynochthonius infirmus</i> sp. nov.</b></p><p>Chinese name. <b>弱Dȗ伪Dz</b></p><p>Figs 27–30</p><p><b>Type material.</b> Holotype ♂ (Ps.- MHBU-SC2020083001): China, Sichuan Province, Luzhou City, Gulin County, Guanniu Cave 2 [28.038775°N, 105.812703°E], 890 m a.s.l., 30 August 2020, Zegang Feng, Hongru Xu & Yangmeng Hou leg. Paratypes: 4 ♀ (Ps.- MHBU-SC2020083002–05), all with the same data as the holotype.</p><p><b>Etymology</b>. The specific name is derived from the Latin word “ <i>infirmus</i> ”, meaning feeble, which refers to the two eyespots.</p><p><b>Diagnosis.</b> (♂ ♀). Moderately sized hypogean species; carapace with two eyespots, anterior margin smooth and epistome small and triangular; tergites Ⅰ–ⅠV each with four setae. Pedipalps slender, chela 8.47 (♂), 7.57–8.05 (♀) times as long as broad; femur 8.69 (♂), 7.75–8.13 (♀) times as long as broad; both chelal fingers without intercalary teeth and a modified accessory tooth (<i>td</i>) on prolateral-retrolateral face; chemosensory setae (<i>sc</i>) present on dorsum of chelal hand.</p><p><b>Description.</b> Adult male (holotype) (Figs 27A, 28A– D, 28F–H, 29, 30).</p><p><b>Color</b> generally pale yellow, chelicerae, carapace, pedipalps and tergites slightly darker black, soft parts pale.</p><p><b>Cephalothorax</b> (Figs 27D, F, 28A): carapace nearly subquadrate, 1.05 times as long as broad, weakly constricted basally; posterior region with squamous sculpturing laterally, other area smooth, without furrows; anterior margin smooth, without serrations; epistome strongly point, with two eyespots; with 18 setae arranged s4s: 4: 4: 2: 2, most setae heavy, long and gently curved, anterolateral setae much shorter than others; with three pairs of lyrifissures, first and second pair situated middle and flank to the setae of ocular row, third pair situated lateral to the sole pair of setae of posterior row. Manducatory process with two acuminate distal setae, anterior seta less than 1/2 length of medial seta; apex of coxa I with a rounded anteromedial process; coxae II with 8 terminally indented coxal spines on each side, set as an oblique and arc row, central spines slightly longer than the others (Fig. 29D); intercoxal tubercle absent; chaetotaxy of coxae: P 3, I 3, II 4, III 5, IV 5.</p><p><b>Chelicera</b> (Figs28C, 29B): almost as long as carapace, 1.84 times as long as broad; five setae and two lyrifissures (exterior condylar lyrifissure and exterior lyrifissure) present on hand, all setae acuminate, ventrobasal setae shorter than others; movable finger with one medial seta. Cheliceral hand with moderate wrinkle on both ventral and dorsal sides. Both fingers well provided with teeth, fixed finger with 13 teeth, distal one largest; movable finger with 16 retrorse contiguous small teeth; galea completely vestigial (Fig. 28B). Serrula exterior with 25–27 and serrula interior with 13 blades. Rallum with eight blades, the distal one longest and recumbent basally, with fine barbules and slightly set apart from the other blades, latter tightly grouped and with long pinnae, some of which are subdivided (Fig. 29C).</p><p><b>Pedipalp</b> (Figs 28A–B, 28G, 29E, 30A–B): trochanter 1.53, femur 8.69, patella 2.93, chela 8.47, hand 3.32 times as long as broad; femur 2.56 times as long as patella; movable chelal finger 1.56 times as long as hand and 0.61 times as long as chela. Setae generally long and acuminate. Chelal hand gradually constricted towards fingers, apodeme complex of movable chelal finger strongly sclerotized. Fixed chelal finger and hand with eight trichobothria, movable chelal finger with four trichobothria, <i>ib</i> and <i>isb</i> situated close together, submedially on dorsum of chelal hand; <i>eb</i>, <i>esb</i> and <i>ist</i> at base of fixed chelal finger; <i>esb</i> slightly distal <i>eb</i> and <i>ist</i> slightly distal to <i>esb</i>; <i>it</i> slightly distal to <i>est</i>, situated subdistally; <i>et</i> slightly near to tip of fixed chelal finger, slightly close to chelal teeth; <i>dx</i> situated distal to <i>et</i>; <i>sb</i> slightly closer to <i>st</i> than to <i>b</i>; <i>b</i> and <i>t</i> situated subdistally, <i>t</i> situated at the same level as <i>it</i> and distal to <i>b</i>; <i>est</i> situated distal to <i>b</i> and close to <i>it</i> (Figs. 28A, 30A). Microsetae (chemosensory setae) present on dorsum of chelal hand (Figs. 28B, 30B). Both chelal fingers with a row of teeth, spaced regularly along the margin, teeth smaller distally and proximally: fixed finger with 23 well-spaced, pointed teeth, and a modified accessory tooth on prolateral-retrolateral face (<i>td</i>, slightly distal to <i>dx</i>); movable finger with 13 well-spaced, pointed teeth, plus 10 vestigial, rounded and contiguous basal teeth.</p><p><b>Opisthosoma</b>: generally typical, pleural membrane finely granulated. All tergites and sternites undivided; setae uniseriate and acuminate. Tergal chaetotaxy I–XII: 4: 4: 4: 4: 4: 4: 4: 4: 5: 4: T2T: 0. Sternal chaetotaxy IV– XII: 8: 9: 8: 9: 9: 14: 9: -: 2. Genital region: sternite II with 6 setae scattered on median area, genital opening slit-like, sternite III with 22 setae (Fig. 28H).</p><p><b>Legs</b> (Fig. 30C–D): fine granulation present on anterodorsal faces of femur IV and patella IV. Leg Ⅰ: femur 1.88 times as long as patella; tarsus 2.45 times as long as tibia. Leg IV: femoropatella 3.72 times as long as deep; tibia 6.40 times as long as deep; with basal tactile setae on both tarsal segments: basitarsus 4.00 times as long as deep (TS = 0.31), telotarsus 15.80 times as long as deep and 2.47 times as long as basitarsus (TS = 0.23). Setae of leg I (trochanter to tibia) 2: 8: 8: 10, setae of leg IV (trochanter to basitarsus) 2: 3: 4: 10: 9. Arolium not divided, slightly shorter than the simple claws.</p><p><b>Adult females</b> (paratypes) (Figs 27B, 28I). Mostly same as male; tergal chaetotaxy Ⅰ–ⅩII: 4: 4: 4: 4: 4: 4: 4: 4–5: 5: 4: T2 T: 0; sternal chaetotaxy IV–ⅩII: 6–8: 8–10: 8–9: 9: 9–11: 9–11: 9–11: -: 2. Genital region: sternite II with 10 setae scattered on median area, sternite III with a row of 6–10 setae.</p><p><b>Dimensions</b> (length/breadth or, in the case of the legs, length/depth in mm; ratios in parentheses). Male: body length 1.87. Pedipalps: trochanter 0.23/0.15 (1.53), femur 1.13/0.13 (8.69), patella 0.44/0.15 (2.93), chela 1.61/0.19 (8.47), hand 0.63/0.19 (3.32), movable chelal finger length 0.98. Chelicera 0.57/0.31 (1.84), movable finger length 0.31. Carapace 0.58/0.55 (1.05). Leg I: trochanter 0.18/0.11 (1.64), femur 0.64/0.08 (8.00), patella 0.34/0.07 (4.86), tibia 0.29/0.06 (4.83), tarsus 0.71/0.05 (14.20). Leg IV: trochanter 0.23/0.13 (1.77), femoropatella 0.93/0.25 (3.72), tibia 0.64/0.10 (6.40), basitarsus 0.32/0.08 (4.00), telotarsus 0.79/0.05 (15.80).</p><p>Females:body length1.86–2.49.Pedipalps:trochanter 0.33–0.35/0.16–0.17 (2.06), femur 1.22–1.27/0.15–0.16 (7.75–8.13), patella 0.45–0.51/0.18 (2.50–2.83), chela 1.69–1.77/0.22–0.23 (7.57–8.05), hand 0.67–0.70/0.22– 0.23 (3.00–3.18), movable chelal finger length 0.99–1.27. Chelicera 0.63–0.69/0.34–0.38 (1.80–1.82), movable finger length 0.33–0.36. Carapace 0.58–0.63/0.64–0.67 (0.88–0.97). Leg I: trochanter 0.16–0.21/0.11–0.16 (1.30– 1.67), femur 0.66–0.73/0.08–0.10 (6.70–8.25), patella 0.30–0.35/0.07–0.08 (4.13–4.75), tibia 0.31–0.33/0.06 (5.17–5.50), tarsus 0.71–0.78/0.05–0.06 (11.83–14.40). Leg IV: trochanter 0.24–0.30/0.14–0.15 (1.60–2.14), femoropatella 0.95–1.05/0.24–0.26 (3.65–4.20), tibia 0.63–0.69/0.09–0.10 (6.30–7.22), basitarsus 0.29– 0.32/0.08–0.09 (3.56–4.00), telotarsus 0.76–0.84/0.05– 0.06 (12.83–15.20).</p><p><b>Remarks.</b> <i>Lagynochthonius infirmus</i> <b>sp. nov.</b> differs from all other hypogean <i>Lagynochthonius</i> species except <i>L. crassus</i> and <i>L. latipectus</i> by the absence of intercalary teeth on chelal fingers and the presence of two eyespots on the carapace. It differs from <i>L. crassus</i> and <i>L. latipectus</i> by the small and triangular epistome (obtuse, small, round in <i>L. crassus</i> and <i>L. latipectus</i>) and its longer chela (1.61 mm (♂), 1.69–1.77 mm (♀) compared to 1.54–1.57 mm (♂), 1.55–1.60 mm (♀) in <i>L. crassus</i> and 1.32–1.38 mm (♂), 1.35–1.50 mm (♀) in <i>L. latipectus</i>) (Hou <i>et al.</i> 2022b, 2023a).</p><p><b>Distribution.</b> Known only from the type locality, Guanniu Cave 2 (China, Sichuan Province).</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_15002144 |
| institution | Zenodo |
| language | |
| publishDate | 2024 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Lagynochthonius infirmus SUN, GUO & ZHANG, 2024, sp. nov. SUN, JIANZHOU GUO, XIANGBO ZHANG, FENG Biodiversity Taxonomy Animalia Arthropoda Arachnida Pseudoscorpiones Chthoniidae Lagynochthonius Lagynochthonius infirmus <p><b><i>Lagynochthonius infirmus</i> sp. nov.</b></p><p>Chinese name. <b>弱Dȗ伪Dz</b></p><p>Figs 27–30</p><p><b>Type material.</b> Holotype ♂ (Ps.- MHBU-SC2020083001): China, Sichuan Province, Luzhou City, Gulin County, Guanniu Cave 2 [28.038775°N, 105.812703°E], 890 m a.s.l., 30 August 2020, Zegang Feng, Hongru Xu & Yangmeng Hou leg. Paratypes: 4 ♀ (Ps.- MHBU-SC2020083002–05), all with the same data as the holotype.</p><p><b>Etymology</b>. The specific name is derived from the Latin word “ <i>infirmus</i> ”, meaning feeble, which refers to the two eyespots.</p><p><b>Diagnosis.</b> (♂ ♀). Moderately sized hypogean species; carapace with two eyespots, anterior margin smooth and epistome small and triangular; tergites Ⅰ–ⅠV each with four setae. Pedipalps slender, chela 8.47 (♂), 7.57–8.05 (♀) times as long as broad; femur 8.69 (♂), 7.75–8.13 (♀) times as long as broad; both chelal fingers without intercalary teeth and a modified accessory tooth (<i>td</i>) on prolateral-retrolateral face; chemosensory setae (<i>sc</i>) present on dorsum of chelal hand.</p><p><b>Description.</b> Adult male (holotype) (Figs 27A, 28A– D, 28F–H, 29, 30).</p><p><b>Color</b> generally pale yellow, chelicerae, carapace, pedipalps and tergites slightly darker black, soft parts pale.</p><p><b>Cephalothorax</b> (Figs 27D, F, 28A): carapace nearly subquadrate, 1.05 times as long as broad, weakly constricted basally; posterior region with squamous sculpturing laterally, other area smooth, without furrows; anterior margin smooth, without serrations; epistome strongly point, with two eyespots; with 18 setae arranged s4s: 4: 4: 2: 2, most setae heavy, long and gently curved, anterolateral setae much shorter than others; with three pairs of lyrifissures, first and second pair situated middle and flank to the setae of ocular row, third pair situated lateral to the sole pair of setae of posterior row. Manducatory process with two acuminate distal setae, anterior seta less than 1/2 length of medial seta; apex of coxa I with a rounded anteromedial process; coxae II with 8 terminally indented coxal spines on each side, set as an oblique and arc row, central spines slightly longer than the others (Fig. 29D); intercoxal tubercle absent; chaetotaxy of coxae: P 3, I 3, II 4, III 5, IV 5.</p><p><b>Chelicera</b> (Figs28C, 29B): almost as long as carapace, 1.84 times as long as broad; five setae and two lyrifissures (exterior condylar lyrifissure and exterior lyrifissure) present on hand, all setae acuminate, ventrobasal setae shorter than others; movable finger with one medial seta. Cheliceral hand with moderate wrinkle on both ventral and dorsal sides. Both fingers well provided with teeth, fixed finger with 13 teeth, distal one largest; movable finger with 16 retrorse contiguous small teeth; galea completely vestigial (Fig. 28B). Serrula exterior with 25–27 and serrula interior with 13 blades. Rallum with eight blades, the distal one longest and recumbent basally, with fine barbules and slightly set apart from the other blades, latter tightly grouped and with long pinnae, some of which are subdivided (Fig. 29C).</p><p><b>Pedipalp</b> (Figs 28A–B, 28G, 29E, 30A–B): trochanter 1.53, femur 8.69, patella 2.93, chela 8.47, hand 3.32 times as long as broad; femur 2.56 times as long as patella; movable chelal finger 1.56 times as long as hand and 0.61 times as long as chela. Setae generally long and acuminate. Chelal hand gradually constricted towards fingers, apodeme complex of movable chelal finger strongly sclerotized. Fixed chelal finger and hand with eight trichobothria, movable chelal finger with four trichobothria, <i>ib</i> and <i>isb</i> situated close together, submedially on dorsum of chelal hand; <i>eb</i>, <i>esb</i> and <i>ist</i> at base of fixed chelal finger; <i>esb</i> slightly distal <i>eb</i> and <i>ist</i> slightly distal to <i>esb</i>; <i>it</i> slightly distal to <i>est</i>, situated subdistally; <i>et</i> slightly near to tip of fixed chelal finger, slightly close to chelal teeth; <i>dx</i> situated distal to <i>et</i>; <i>sb</i> slightly closer to <i>st</i> than to <i>b</i>; <i>b</i> and <i>t</i> situated subdistally, <i>t</i> situated at the same level as <i>it</i> and distal to <i>b</i>; <i>est</i> situated distal to <i>b</i> and close to <i>it</i> (Figs. 28A, 30A). Microsetae (chemosensory setae) present on dorsum of chelal hand (Figs. 28B, 30B). Both chelal fingers with a row of teeth, spaced regularly along the margin, teeth smaller distally and proximally: fixed finger with 23 well-spaced, pointed teeth, and a modified accessory tooth on prolateral-retrolateral face (<i>td</i>, slightly distal to <i>dx</i>); movable finger with 13 well-spaced, pointed teeth, plus 10 vestigial, rounded and contiguous basal teeth.</p><p><b>Opisthosoma</b>: generally typical, pleural membrane finely granulated. All tergites and sternites undivided; setae uniseriate and acuminate. Tergal chaetotaxy I–XII: 4: 4: 4: 4: 4: 4: 4: 4: 5: 4: T2T: 0. Sternal chaetotaxy IV– XII: 8: 9: 8: 9: 9: 14: 9: -: 2. Genital region: sternite II with 6 setae scattered on median area, genital opening slit-like, sternite III with 22 setae (Fig. 28H).</p><p><b>Legs</b> (Fig. 30C–D): fine granulation present on anterodorsal faces of femur IV and patella IV. Leg Ⅰ: femur 1.88 times as long as patella; tarsus 2.45 times as long as tibia. Leg IV: femoropatella 3.72 times as long as deep; tibia 6.40 times as long as deep; with basal tactile setae on both tarsal segments: basitarsus 4.00 times as long as deep (TS = 0.31), telotarsus 15.80 times as long as deep and 2.47 times as long as basitarsus (TS = 0.23). Setae of leg I (trochanter to tibia) 2: 8: 8: 10, setae of leg IV (trochanter to basitarsus) 2: 3: 4: 10: 9. Arolium not divided, slightly shorter than the simple claws.</p><p><b>Adult females</b> (paratypes) (Figs 27B, 28I). Mostly same as male; tergal chaetotaxy Ⅰ–ⅩII: 4: 4: 4: 4: 4: 4: 4: 4–5: 5: 4: T2 T: 0; sternal chaetotaxy IV–ⅩII: 6–8: 8–10: 8–9: 9: 9–11: 9–11: 9–11: -: 2. Genital region: sternite II with 10 setae scattered on median area, sternite III with a row of 6–10 setae.</p><p><b>Dimensions</b> (length/breadth or, in the case of the legs, length/depth in mm; ratios in parentheses). Male: body length 1.87. Pedipalps: trochanter 0.23/0.15 (1.53), femur 1.13/0.13 (8.69), patella 0.44/0.15 (2.93), chela 1.61/0.19 (8.47), hand 0.63/0.19 (3.32), movable chelal finger length 0.98. Chelicera 0.57/0.31 (1.84), movable finger length 0.31. Carapace 0.58/0.55 (1.05). Leg I: trochanter 0.18/0.11 (1.64), femur 0.64/0.08 (8.00), patella 0.34/0.07 (4.86), tibia 0.29/0.06 (4.83), tarsus 0.71/0.05 (14.20). Leg IV: trochanter 0.23/0.13 (1.77), femoropatella 0.93/0.25 (3.72), tibia 0.64/0.10 (6.40), basitarsus 0.32/0.08 (4.00), telotarsus 0.79/0.05 (15.80).</p><p>Females:body length1.86–2.49.Pedipalps:trochanter 0.33–0.35/0.16–0.17 (2.06), femur 1.22–1.27/0.15–0.16 (7.75–8.13), patella 0.45–0.51/0.18 (2.50–2.83), chela 1.69–1.77/0.22–0.23 (7.57–8.05), hand 0.67–0.70/0.22– 0.23 (3.00–3.18), movable chelal finger length 0.99–1.27. Chelicera 0.63–0.69/0.34–0.38 (1.80–1.82), movable finger length 0.33–0.36. Carapace 0.58–0.63/0.64–0.67 (0.88–0.97). Leg I: trochanter 0.16–0.21/0.11–0.16 (1.30– 1.67), femur 0.66–0.73/0.08–0.10 (6.70–8.25), patella 0.30–0.35/0.07–0.08 (4.13–4.75), tibia 0.31–0.33/0.06 (5.17–5.50), tarsus 0.71–0.78/0.05–0.06 (11.83–14.40). Leg IV: trochanter 0.24–0.30/0.14–0.15 (1.60–2.14), femoropatella 0.95–1.05/0.24–0.26 (3.65–4.20), tibia 0.63–0.69/0.09–0.10 (6.30–7.22), basitarsus 0.29– 0.32/0.08–0.09 (3.56–4.00), telotarsus 0.76–0.84/0.05– 0.06 (12.83–15.20).</p><p><b>Remarks.</b> <i>Lagynochthonius infirmus</i> <b>sp. nov.</b> differs from all other hypogean <i>Lagynochthonius</i> species except <i>L. crassus</i> and <i>L. latipectus</i> by the absence of intercalary teeth on chelal fingers and the presence of two eyespots on the carapace. It differs from <i>L. crassus</i> and <i>L. latipectus</i> by the small and triangular epistome (obtuse, small, round in <i>L. crassus</i> and <i>L. latipectus</i>) and its longer chela (1.61 mm (♂), 1.69–1.77 mm (♀) compared to 1.54–1.57 mm (♂), 1.55–1.60 mm (♀) in <i>L. crassus</i> and 1.32–1.38 mm (♂), 1.35–1.50 mm (♀) in <i>L. latipectus</i>) (Hou <i>et al.</i> 2022b, 2023a).</p><p><b>Distribution.</b> Known only from the type locality, Guanniu Cave 2 (China, Sichuan Province).</p> |
| title | Lagynochthonius infirmus SUN, GUO & ZHANG, 2024, sp. nov. |
| topic | Biodiversity Taxonomy Animalia Arthropoda Arachnida Pseudoscorpiones Chthoniidae Lagynochthonius Lagynochthonius infirmus |
| url | https://doi.org/10.5281/zenodo.15002144 |