Andiorrhinus (Turedrilus) pascalei Bartz & Decaëns, 2024

Decaëns, Thibaud, Bartz, Marie Luise Carolina, Bartz, arolina, Feijoo-Martínez, Alexander, Goulpeau, Arnaud, Lapied, Emmanuel, Marchán, Daniel F., Maggia, Marie-Eugénie, Papuga, Guillaume & James, Samuel W., 2024, Earthworms (Oligochaeta, Clitellata) of the Mitaraka range (French Guiana): commented checklist with description of one genus and eighteen species new to science, Zoosystema 46 (9), pp. 196-244 : 203-204

Andiorrhinus (Turedrilus) pascalei Bartz & Decaëns , n. sp.

( Fig. 5 )

urn:lsid:zoobank.org:act:9E3C409B-0CD2-4876-9D94-EAF68E2D2C52

TYPE MATERIAL. — Holotype. French Guiana • Adult (with posterior regeneration); Tumuc-Humac, Mitaraka Massif , plateau forest at base camp, in the soil; 2°14’2”N, 54°27’1”W; 331 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0174 ; MNHN.

Paratypes. French Guiana • 1 adult specimen; Tumuc-Humac, Mitaraka Massif, plateau forest at base camp; 2°14’2”N, 54°27’1”W; 331 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0176 ; CEFE .

OTHER MATERIAL EXAMINED. — French Guiana • 1 juvenile specimen; Tumuc-Humac, Mitaraka Massif , plateau forest at base camp; 2°14’2”N, 54°27’1”W; 331 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0177 ; MNHN .

ETYMOLOGY. — This species is named in acknowledgment to Olivier Pascal, who organised the “Our Planet Reviewed” in the Mitaraka Massif.

ECOLOGY. — Andiorrhinus (T.) pascalei Bartz & Decaëns , n. sp. was found in the organo-mineral soil at the base camp of the expedition in a plateau forest ecosystem ( Fig. 5D, E ).

DISTRIBUTION. — Andiorrhinus (T.) pascalei Bartz & Decaëns , n. sp. is known from the Mitaraka Massif.

DESCRIPTION

External morphology ( Fig. 5A )

Body shape cylindrical. Body pigmentation absent. Body length: 196 mm in the holotype, 158 mm in the paratype, after ethanol fixation. Body mass: 11.90 g after ethanol fixation in the holotype, 5.51 g in the paratype. Diameter: 8 to 9 mm in the preclitellar region, 10 to 12 mm in the clitellum, 9 to 11 mm in the postclitellar region. Number of segments: 244 in the holotype, 230 in the paratype. Prostomium proepilobic. Setae closely paired, ab beginning in III and cd in IV, ab ventral and cd mid-lateral to dorsal. Postclitellar setal arrangement aa:ab:bc:cd:dd = 16:1:11:1:33. Clitellum in (dorsal XIII) XIV-XXI (dorsal XXII, XXIII), saddle-shaped. Genital markings in IX to XI, intraclitellar in XVII-XX (ab position).Tubercula pubertatis linear in 1/4XV-3/4 XX. Male pores not recognised, and ovipores not visible. Spermathecal pores in 6/7, 7/8 and 8/9. Nephridial pores begining in III, in D line.

Internal anatomy ( Fig. 5B, C )

Septa: strongly thickened in 6/7 to 13/14, otherwise membranous. Gizzard: muscular and well developed in VI, with an average size (width × length) of 3.45 × 4.45 mm. Calciferous glands: three pairs in VII-IX, with lamellar structure ( Fig. 5B ). Esophagus-intestine transition in XX; intestine without caeca. Typhlosole abruptly begining in XX/XXI, structured as a long thick folded lamella occupying all the lumen. Intestinal hearts: two pairs of large hearts in X-XI, more developed in XI than in X. Excretory system holoic. Testes sacs: in X and XI containing the two pairs of testes and funnels, ventrally attached to septa 9/10 and 10/11. Seminal vesicles: two pairs in XI-XII, forming very small white mass under the alimentary canal, the pair in XI slightly smaller than in XII, both at least three times smaller than the hearts. Spermathecae: three pairs in VII to IX, very small and round spatula-shaped, attached to septa 6/7, 7/8 and 8/9, without diverticula ( Fig. 5C ).

REMARKS

Andiorrhinus (T.) pascalei Bartz & Decaëns , n. sp. is attached to the subgenus Turedrilus by the position of the last pair of intestinal hearts in XI. Within Turedrilus it is close to Andiorrhinus (Turedrilus) royeroi Drachenberg, 1991 , Andiorrhinus (Turedrilus) samuelensis Righi, 1986 , Andiorrhinus (Turedrilus) baniwa Righi & Nemeth, 1983 , and Andiorrhinus (Turedrilus) brunneus (Michaelsen, 1892) , all of which have three pairs of spermathecae. It differs from A. (T.) royeroi by the position of the spermathecae in VII-IX instead of VI-VIII, and from all species mentioned by the unique position of its clitellum and tubercula pubertatis ( Hernández-García et al. 2018a). This species corresponds to OTU#084 in Maggia et al. (2021).

Figures

FIG. 5. — Andiorrhinus (Turedrilus) pascalei Bartz & Decaëns n. sp.: A, external and lateral view of the anterior body (arrows indicate the clitellum position on the dorsal side, and of the tubercula pubertatis on the ventral side); B, detail of the calciferous glands after being extracted from the dissection; C, detail of the dissection showing the spermathecae;D, habitat preferences;E, microhabitat preferences.All images from the holotype specimen:CL, clitellum;SP, spermathecae; TP, tubercula pubertatis; N, total number of specimens in the dataset. Scale bars: A, 10 mm; C, 2.5 mm.