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Dolomedes reuniascar Cazanove, Yu, Derepas & Henrard, 2025, sp. nov.

Year: 2025
Type: other
Abstract: Dolomedes reuniascar sp. nov. urn:lsid:zoobank.org:act: 93BA507B-19C1-4945-A246-5C1D7BD5AA8C Figs 3–14 Diagnosis Dolomedes reuniascar sp. nov. can be distinguished from all the other known Dolomedes species, including those from Madagascar, by the combination of the following characters: I) the deep V-shaped epigynal folds (Figs 3D, 4A, 5C–D, 6); II) the S-shaped copulatory duct + base of spermatheca in the dorsal view (Fig. 4B); III) the crown-shaped RTA with two large ventral teeth and 5–8 smaller dorsal teeth (Figs 3E, 4C–D, see also variation Fig. 11) and; IV) the sharp medial embolic hook (Fig. 4E). Etymology The specific epithet ‘ reuniascar ’ is a noun in apposition. It refers to the current known distribution of the species: La Réunion Island and Madagascar. Type material Holotype FRANCE – La Réunion • ♀; Saint Paul, National Natural Reserve of Étang de Saint Paul, coco alley; 20°59ʹ24ʺ S, 55°17ʹ53.159ʺ E; 9 m a.s.l.; 20 Feb. 2018; Cazanove G. leg.; wet meadow; MHNRé, MHNRé - 2018.E.1.226. Paratypes (6 specimens) FRANCE – La Réunion • 1 ♂; same collection data as for holotype; MHNRé, MHNRé - 2018.E.1.225 • 1 ♀; Saint Paul, National Natural Reserve of Etang de Saint Paul, edge of the Tour des Roches, at the level of the Vierge du Champ-court; 21°0ʹ1.44ʺ S, 55°18ʹ4.679ʺ E; 10 m a.s.l.; 10 Oct. 2018; Amouret N. leg.; with egg sac emergence; MHNRé, MHNRé - 2018.E.1.223 • 1 ♂; Salazie, Mare à poule d’eau; 21°3ʹ4.32ʺ S, 55°31ʹ31.8ʺ E; 688 m a.s.l.; 18 Sep. 2020; Baglan A. leg.; MHNRé, MHNRé - 2020.E.15.1 • 1 ♀; Etang-Salé les Bains, wet zone; 21°17ʹ8.16ʺ S, 55°23ʹ22.56ʺ E; 7 m a.s.l.; s. d.; Derepas B. leg. (RE406); MHNRé, MHNRé - 2024.E.4.1 • 1 ♂; Bras Panon, Parc des berges de la Rivière du Mât; 20°58ʹ46.2ʺ S, 55°38ʹ20.759ʺ E; 126 m a.s.l.; 23 Jan. 2021; Dietrich M. leg.; wet zone; collected as subadult and become adult 31 Jan. 2021 after breeding (RE410); MHNRé, MHNRé - 2024.E.4.2. MADAGASCAR – Antananarivo Province • 1 ♂; Parc de Tsarasaotra, Antananarivo; 18°52ʹ0.84ʺ S, 47°31ʹ4.08ʺ E; 1248 m a.s.l.; 3 Apr. 2022; Kuang-Ping Yu leg.; shallow marsh; USNMENT, USNMENT01580833 • 1 ♀; same data as for preceding; with egg sac; USNMENT, USNMENT01580834. Other material examined (525 specimens) FRANCE – La Réunion • 1 ♀; Saint Paul, National Natural Reserve of Etang de Saint Paul; 22 Feb. 2018; unidentified Reserve agent leg.; MHNRé, MHNRé - 2018.E.1.221 • 1 juvenile; Saint Paul, Ravine Divon; 21°0ʹ39.6ʺ S, 55°17ʹ11.759ʺ E; 23 m a.s.l.; 24 Apr. 2009; Cazanove G. leg.; on sight; GC 268 (collection Cazanove G.) • 2 juveniles; Salazie, Mare à poule d’eau; 21°3ʹ4.32ʺ S, 55°31ʹ31.8ʺ E; 688 m a.s.l.; 18 Sep. 2020; Baglan A. leg.; MHNRé, MHNRé - 2020.E.15.2 • 1 juvenile; Salazie, Mare à poule d’eau; 2 Nov. 2022; 21°3ʹ4.32ʺ S, 55°31ʹ31.8ʺ E; 688 m a.s.l.; Cazanove G. leg.; beating, Pistia stratiotes; MHNRé, MHNRé - 2022.E.14.14 • 1 juvenile; same data as for preceding; MHNRé, MHNRé - 2022.E.14.23 • 509 juveniles; Saint Paul, National Natural Reserve of Etang de Saint Paul, coco alley; 20 Feb. 2018; 20°59ʹ24ʺ S, 55°17ʹ53.159ʺ E; 9 m a.s.l.; Cazanove G. leg.; wet grassland; from egg sac emergence; MHNRé, MHNRé - 2018.E.1.222 • 1 juvenile; Saint Marie; 29 Nov. 1950; Hamon J. leg.; 11596 KG, collection Ledoux J-Cl., MNHN. MADAGASCAR – Antananarivo Province • 1 ♀; Parc de Tsarasaotra, Antananarivo; 18°52ʹ0.84ʺ S, 47°31ʹ4.08ʺ E; 1248 m a.s.l.; 3 Apr. 2022; Kuang-Ping Yu leg.; shallow marsh; NIB - KPARA00173 • 1 ♂; same data as for preceding; NIB - KPARA00174 – Toamasina Province • 1 ♀; Parc national d'Andasibe-Mantadia; 18°51ʹ9.36ʺ S, 48°25ʹ37.919ʺ E, 949 m a.s.l.; 06 Apr. 2022; Kuang-Ping Yu leg.; Ponds before Chute Sacree Trail; NIB - KPARA00211 • 3 ♂; Parc Mitsinjo, Orchid Lake; 18°55ʹ58.08ʺ S, 48°24ʹ48.96ʺ E; 935 m a.s.l.; 07 Apr. 2022; Kuang-Ping Yu leg.; NIB - KPARA00215–00217 – Antsiranana Province • 2 ♂; Sambava; 14°22ʹ24.96ʺ S, 50°10ʹ23.159ʺ E; 13 m a.s.l.; 23 Mar. 2022; Kuang-Ping Yu leg.; Swamp 11.5 km SE of Sambava; collected as subadults; NIB - KPARA00225 & NIB - KPARA00246 • 1 ♀: same data as for preceding; collected as juvenile; NIB - KPARA00408. Records based on photographs and observations We compiled some other observations of Dolomedes reuniascar sp. nov. on La Réunion island (see Appendix 1). Description Female (Holotype MHNRé - 2018.E.1.226) Total length: 13.2. Color. Carapace greenish yellow, with white margins and two pale yellow arc-shaped markings behind ALEs; eye region dark; clypeus white; chelicerae greenish yellow with dark reddish fangs; labium and endites yellowish beige; palp greenish brown; sternum pale yellow; legs: coxa and trochanter yellow; femur yellow with lateral side slightly greenish, patella greenish with reddish tip, tibia, metatarsus and tarsus light brown; abdomen darker than the cephalothorax, with white spots in one median and two sublateral rows extending to the posterior end, near spinnerets; ventral abdomen clear, pale yellow; lateral sides of abdomen with white band extend from lateral white margin of cephalothorax; spinnerets greenish. Carapace (Figs 3A, 5A). 6.8 length; 6.1 width; 2.2 height. Pear-shaped, with concave posterior margin; eye region with long bristles originating behind and overhanging the posterior lateral eyes. Fovea longitudinal, slit-like, strongly marked. Eyes. Two rows, each with four homogeneous-sized eyes. Anterior row slightly procurved while posterior row strongly recurved. Eyes measurements. ALE 0.18; AME 0.23; PLE 0.43; PME 0.4; ALE-AME 0.075; AME-AME 0.28; PME-PME 0.33; PME-PLE: 0.43; Clypeus 0.7 high. Sternum (Fig. 5B). 2.5 long and 2.8 wide. Wider than long, with sinuous lateral margins pointing between coxae, anterior margin with two shallow concavities, with long, evenly dispersed setae. Chelicerae. Robust, with four retromarginal teeth and two to three promarginal teeth; central promarginal tooth is the largest. Abdomen (Figs 3A, 5A–B, paratype). Greenish, dorsolaterally with two main, slightly curved rows of 5 to 6 white spots ringed with black, posterior half medially with few other spots: most anterior pairs arranged transversal and posterior pairs arranged longitudinal. Genitalia (Figs 3D, 5C–E, paratype; 6). Epigyne with large median field (MF) forming shallow atrium, with widely opened V-shaped posterior margin that forms strongly sclerotized epigynal folds (EF); with fully separated lateral lobes (LL) blunt, converging posteriorly; copulatory openings (CO) minute, located along epigynal folds (EF). Vulva symmetrical, each with semicircular copulatory duct (CD) originating posteriorly and extend anteriorly to indistinct spermathecal base; accessory bulb (AB) small, dorsally pointed; base of spermatheca (BS) well developed, arranged in ‘S’ shape; fertilization duct (FD) positioned medially and bent 90° outward. Palp. With strong spines. Legs. With strong spines (see Fig. 7) and numerous trichobothria and bristles on tarsi, metatarsi and tibiae. Leg formula: 4123. Leg measurements: see Table 1. Leg spination formula: Femur I = dm 1-1 da 1 pl 1-1-1 rl 1-1-1-1-1; patella I = rlm 1 plm 1 da 1; tibia I = db 1 dm 1 pl 1-1 rl 1-1; vpl 1-1-1-1 vrl 1-1-1-1; metatarsus I = dpla 1 drla 1 pl 1-1-1 rl 1-1-1 vpl 1-1 vrl 1-1 va 1; tarsus I = 0. Femur II = dm 1-1 da 1 pl 1-1-1-1-1 rl 1-1-1-1-1; patella II = rlm 1 plm 1 da 1; tibia II = db 1 dm 1 pl 1-1 rl 1-1 vpl 1-1-1-1 vrl 1-1-1-1; metatarsus II = dpla 1 drla 1 pl 1-1-1 rl 1-1-1 vpl 1-1 vrl 1-1 va 1; tarsus II = 0. Femur III = dm 1-1 da 1 pl 1-1-1-1-1 rl 1-1-1-1-1; patella III = rlm 1 plm 1 da 1; tibia III = db 1 dm 1 rl 1-1 pl 1-1 vrl 1-1-1 vpl 1-1-1; metatarsus III = dpla 1 drla 1 pl 1-1-1 rl 1-1-1 vpl 1-1 vrl 1-1 va 1; tarsus III = 0. Femur IV = dm 1-1 da 1 pl 1-1-1-1-1 rl 1-1; patella IV = rlm 1 plm 1 da 1; tibia IV = db 1 dm 1 rl 1-1 pl 1-1 vrl 1-1-1 vpl 1-1-1; metatarsus IV = dpla 1 drla 1 pl 1-1-1 rl 1-1-1 vpl 1-1 vrl 1-1-1 va 1; tarsus IV = 0. Spine position and their number are illustrated in Fig. 7. Claws. Superior tarsal claw teeth numbers: 6–7 (I), 7–8 (II), 7–8 (III), 8–9 (IV); inferior tarsal claw without tooth. Male (paratype MHNRé - 2018.E.1.225 and MHNRé - 2024.E.4.2) As in female except as noted. Total length: 9. Carapace (Figs 3B, 8A). 4.5 length, 4.3 width, 1.7 height. Eyes measurements. ALE 0.13; AME 0.15; PLE 0.3; PME 0.28; ALE-AME 0.13; AME-AME 0.1; PME-PME 0.18; PME-PLE: 0.28; Clypeus 0.48 high. Sternum (Fig. 8B). 1.7 long and 2.2 wide. Chelicerae (Fig. 8C). Robust, with four retromarginal teeth and two to three promarginal teeth; central promarginal tooth the largest. Genitalia (Figs 3E (KPARA_00246), 9, see also variation Fig. 11). Palp tibia provided with prominent VTA and RTA with two large ventral teeth and 6 smaller dorsal teeth. Cymbium (Cy) with stout, roughly oval-shaped basal apophysis (BAC). Sub tegulum (ST) semicircular, sitting at base of tegulum. Tegulum (Te) stout and transverse, provided with thick and curved distal tegular projection (DTP) forming ‘U’ shaped tegular ring together with membranous conductor (C); sclerotized round-shaped structure (Sa) sitting in lower center tegular ring with sickle-shaped median apophysis (MA) positioned retrolaterally. Embolus (E) long, tapered, originating anteriorly and directed retrolaterally, in middle with small hookshaped extension (EH) pointing anteriorly. Embolus emerging anteriorly from distal sclerotized tube of apical division together with rectangular lateral subterminal apophysis (LA) and sharply hooked fulcrum (Fu). Leg measurements: see Table 2. Leg spination formula: Femur I = dm 1-1 da 1 pl 1-1-1-1-1 rl 1-1-1-1-1; patella I = rlm 1 plm 1 da 1; tibia I = db 1 dm 1 pl 1-1 rl 1-1 vpl 1-1-1-1 vrl 1-1-1-1; metatarsus I = dpla 1 drla 1 pl 1-1-1 rl 1-1-1 vpl 1-1 vrl 1-1 va 1; tarsus I = 0. Femur II = dm 1-1 da 1 pl 1-1-1-1-1 rl 1-1-1-1-1; patella II = rlm 1 plm 1 da 1; tibia II = db 1 dm 1 pl 1-1 rl 1-1 vpl 1-1-1-1 vrl 1-1-1-1;; metatarsus II = dpla 1 drla 1 pl 1-1-1 rl 1-1-1 vpl 1-1 vrl 1-1 va 1; tarsus II = 0. Femur
DOI: 10.5281/zenodo.15693532
Language: English
Subfield: Genetics
Open Access status: green
OpenAlex ID: W6949372664
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