Avelona yvesi Gerard & Marchan 2025, sp. nov.

Avelona yvesi Gérard & Marchán sp. nov. urn:lsid:zoobank.org:act: 76ABC2DB-AFF8-4F25-93DB-556B09AC3CF1 Type material. Holotype. France Adult; Bourgogne-Franche-Comté, Jura, Courbouzon; latitude/longitude: 46.660 / 5.527; elevation: 259 m asl; 11-April-2023; S. Gérard, J. Goussopoulos leg.; Sample ID: SG-0087; deposited at MNHN. Paratypes. France 14 adult specimens, 5 subadult specimens; same data as holotype (19 specimens); Sample ID: SG-0089, SG-0090, SG-0091, SG-0092, SG-0093, SG-0094, SG-0095, SG-0096, SG-0097, SG-0098, SG-0099¸ SG-0100¸ SG-0101, SG-0102, SG-0103, SG-0104, SG-0105, SG-0106, SG-0107; deposited at Eco & Sols. Etymology. The species is dedicated to Yves Gérard, the father of the first author of this work. Y. Gérard has always worked as a volunteer in highlighting and protecting biodiversity in Northeastern France through various nonprofit organizations (SHNM: Société d’Histoire naturelle de la Moselle and CPEPESC: Commission de protection des eaux, du patrimoine, de l’environnement, du sous-sol et des chiroptères). He battled against Amyotrophic lateral sclerosis and we want to pay tribute to him with the description of this species. Description. External morphology (Fig. 3). Pigmentation absent, except for a few faint mid-segment pigmentary dots in the first segments. Beige with a whitish clitellum after ethanol fixation (Fig. 3A). Average length: 3.73 cm (3–4.4 cm, holotype: 4.3 cm). Average weight: 0.19 g (0.15–0.25 g, holotype: 0.22 g). Average number of segments: 136 (131–140, holotype: 135). Setae closely paired, postclitellar setal formula aa: ab: bc: cd: dd = 9:1:5:1:20. On fixed specimens, the tail ends abruptly, as if it was cut (Fig. 3B). Prostomium epilobous, open. Longitudinal furrows in the first two segments. First dorsal pore in intersegment 3/4 (4/5). Nephridial pores aligned in area B (i.e., between setae b and c), at 1/2 ab from b. Spermathecal pores at intersegmental furrows 9/10–10/ 11 in c. Male pores in 15, surrounded by a strongly developed porophore extending over 14 and 16. Female pores in 14. Genital papillae in 9, 12, 13, 17 (strongly developed and consistent), (23, 26, 29) 30 (35, 36), in ab. Clitellum saddle-shaped in 28–35. Tubercula pubertatis in 32-1/n 35. Internal anatomy. Septa 5/6–9/10 thickened. Lateral hearts in 6–11. Calciferous glands in 10–14, dilated in 10. Crop in 15–16, gizzard in 17–18. Typhlosole starts pinnate and becomes bifid around 24. Male sexual system holandric, testes and funnels (not enclosed in testes sacs, but with sperm present) located ventrally in 10 and 11. Two pairs of reniform seminal vesicles in 11 and 12. Ovaries and female funnels in 13, ovarian receptacles (ovisacs) in 14. Two pairs of small globular spermathecae in 10 and 11 (intersegments 9/10, 10/11), simple. Nephridial bladders J-shaped (Fig. 5). Differential diagnosis. Avelona yvesi sp. nov. can be distinguished from the most similar species Avelona zicsii (Bouché, 1972) comb. nov. by the position of the clitellum (28–35 vs. 26–34(1/3-35)) and tubercula pubertatis (32- 1/n 35 vs. 30-1/2 33) (Fig. 3, Fig. 4, Fig. S1, Table 1). COI uncorrected average pairwise distances and topology of multilocus molecular phylogenetic trees supports the status of Av. yvesi sp. nov. as independent from other morphologically related species. Distribution and ecology. Avelona yvesi sp. nov. was found in the vicinities of the Jura Massif (near Lons-le-Saunier) (Fig. 2) in a pasture (Fig. 3G).