Vignysa callasensis Gerard, Characters Decaens & Marchan 2023, n. sp.
Creators: name: Gérard, Sylvain
name: Marchán, Daniel Fernández
name: Navarro, Alejandro Martinez
name: Hedde, Mickaël
name: Decaëns, Thibaud
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Clitellata
Crassiclitellata
Hormogastridae
Vignysa
Vignysa callasensis

description: Vignysa callasensis Gérard, Decaëns & Marchán, n. sp.
(Figs 9; 10; 11)
urn:lsid:zoobank.org:act: CF80AC3C-631B-4AE4-A58D-83632F1541B1
TYPE MATERIAL. — Holotype. France • 1 adult specimen; Provence-Alpes-Côte d’Azur, Var, 83830 Callas, in the soil; 43°35’13”N, 6°32’16”E; 340 m a.s.l.; 28.XI.2021; T. Decaëns, D. F. Marchán, S. Gérard, R. Della Vedova leg.; MNHN (BOLD Sample ID: DFM-1062).
Paratypes. France • 4 adult specimens; same data as holotype; Eco & Sols (BOLD Sample ID: DFM-1061, DFM-1065, SG-0057, SG-0058) • 4 specimens; same data as holotype; MNHN (BOLD Sample ID: DFM-1064, DFM-1063; SG-0059, SG-0060).
OTHER MATERIAL. — France • 10 adult and 11 sub-adult specimens; same data as holotype; Eco & Sols.
ETYMOLOGY. — The name of the species is derived from the city of Callas in the Var department (Provence-Alpes-Côte d’Azur, France) where the type specimens were found.
ECOLOGY. — Vignysa callasensis Gérard, Decaëns & Marchán, n. sp. was found in a riparian grassland near La Risse stream, at a low elevation (340 m a.s.l.).
DISTRIBUTION. — Vignysa callasensis Gérard, Decaëns & Marchán, n. sp. was found near the city of Callas, in the sedimentary basin North to Esterel, in the Var department (Provence-Alpes-Côte d’Azur, France).
DESCRIPTION
External morphology (Fig. 9A, B)
Body shape cylindrical. Body pigmentation absent. Gut content visible by transparency. Average body length after ethanol fixation: 95 mm (range: 82 to 150 mm; n = 9 adult specimens; holotype: 100 mm). Average body mass: 0.984 g (range: 0.850 to 1.260 g; n = 11; holotype: 1.260 g). Average diameter: 4.0 mm in the preclitellar region (range: 3.5 to 4.8 mm; n = 11; holotype: 4.8 mm), 4.5 mm in the clitellum (range: 4.0 to 5.4 mm; n = 11; holotype: 5.3 mm), 4.9 mm in the postclitellar region (range: 4.0 to 5.5 mm; n = 11: holotype: 5.5 mm). Average number of segments: 162 (157 to 167; n = 7; holotype: 157). Prostomium of prolobous type. Setae closely paired. Setal arrangement aa:ab:bc:cd:dd = 18:2:8:1:25. Clitellum in XV-XXIII, beginning unclear. Genital markings in XII-XIV and XX-XXIII, in ab. Tubercula pubertatis: thin band in XVII-XXIII, more marked in XX-XXIII. Male pores: one pair in XV. Ovipores not visible. Spermathecal pores not visible. Nephridial pores not visible.
Internal anatomy (Fig. 9C, D)
Septa: thickened from 7/8 to 9/10, otherwise membranous. Crop: missing. Gizzard: two globular gizzards in VI-VII, of 1.5 mm in diameter. Calciferous glands: absent. OEsophagus-intestine transition in XIII. Typhlosole start in XX or XXII, formed by a Y-shaped large lamellae.Hearts: in VI-XI. Excretory apparatus: one pair of holonephridia per segment, nephridial vesicles boat-hook shaped (bent cecum) in preclitellar segments, open V shaped in the rest of the body. Seminal vesicles: two pairs in XI-XII, large and lobulated. Spermathecae: two pairs in IX-X (9/10, 10/11), intracoelomic, tubular and folded, simple.
REMARKS
This species is the smallest species of the genus Vignysa: 0.850 -1.260 g and 157-167 segments vs 1.400 -2.700 g and 205-232 segments for Vignysa teres (Bouché 1972; personal data), and 3.500 -4.800 g and 372-396 segments for Vignysa vedovinii (Rota 1994) (see Table 5). It is also the easternmost species within the genus. Alive, it has a viscous texture (Fig. 11) and tends to break easily. It shares with V. vedovinii the absence of blood vesicles.
description: Published as part of Gérard, Sylvain, Marchán, Daniel Fernández, Navarro, Alejandro Martinez, Hedde, Mickaël & Decaëns, Thibaud, 2023, Resampling Bouché's historical localities reveals three new species and helps identifying a new genus of earthworms (Oligochaeta, Hormogastridae and Lumbricidae) in Southeastern France, pp. 749-768 in Zoosystema 45 (23) on pages 759-761, DOI: 10.5252/zoosystema2023v45a23, http://zenodo.org/record/10275978