Martiodrilus (Botaria) wayana 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 : 215

Martiodrilus (Botaria) wayana Bartz & Decaëns , n. sp.

( Fig. 11 )

urn:lsid:zoobank.org:act:DE41C1ED-7C4B-46C2-B48B-7029D3D57299

TYPE MATERIAL. — Holotype. French Guiana • Adult; Tumuc-Humac, Mitaraka Massif , rocky savannah on Borne 1 Inselberg , in terrestrial bromeliad roots; 2°12’29”N, 54°26’20”W; 585 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0134 ; MNHN.

Paratypes. French Guiana • 3 adult specimens; Tumuc-Humac, Mitaraka Massif , rocky savannah on Borne 1 Inselberg ; 2°12’29”N, 54°26’20”W; 585 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0378 , EW-MI15-0136 , EW-MI15-0137 ; CEFE • 3 adult specimens; same data as for preceding; BOLD Sample ID: EW-MI15-0133 , EW-MI15-0135 , EW-MI15-0138 ; MNHN .

OTHER MATERIAL EXAMINED. — French Guiana • 1 juvenile specimen; Tumuc-Humac, Mitaraka Massif , hilltop forest on Borne 1 Inselberg ; 2°12’35”N, 54°26’12”W; 600 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0220 ; MNHN • 10 juvenile specimens; Tumuc-Humac, Mitaraka Massif , rocky savannah on Borne 1 Inselberg ; 2°12’29”N, 54°26’20”W; 585 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0140 , EW-MI15-0141 , EW-MI15-0142 , EW-MI15-0143 , EW-MI15-0144 , EW-MI15-0145 , EW-MI15-0146 , EW-MI15-0147 , EW-MI15-0148 , EW-MI15-0149 ; MNHN .

ETYMOLOGY. — This species is named after the Wayanas Amerindian people who inhabited this region of French Guiana and have left multiple petroglyphs and stone assemblages on the Borne 1 inselberg ( Fleury et al. 2021).

ECOLOGY. — Martiodrilus (B.) wayana Bartz & Decaëns , n. sp. has been found essentially in inselberg rocky savannahs (94.44% of specimens) ( Fig. 11D ), where it inhabits the root mat of terrestrial bromeliad formations ( Fig. 11G ).

DISTRIBUTION. — Martiodrilus (B.) wayana Bartz & Decaëns , n. sp. is only known from the Borne 1 inselberg, at the frontier between French Guiana and Brazil, in the Mitaraka Massif.

DESCRIPTION

External morphology ( Fig. 11A, B )

Body shape cylindrical. Body pigmentation dorsally dark brown, ventrally yellow. Body length: 74 mm in the holotype, 55 to 70 mm in the paratypes (average: 60.7 mm; n = 3), after ethanol fixation. Body mass: 0.50 g after ethanol fixation in the holotype, 0.11 to 0.48 g in the paratypes (average: 0.23 g; n = 3). Diameter: 3.2 to 5 mm in the preclitellar region, 3.5 to 4.5 mm in the clitellum, 3.4 to 5 mm in the postclitellar region. Number of segments: 140 in the holotype, 104 to 141 in the paratypes (average: 123; n = 3). Prostomium proepilobic. One pair of longitudinal grooves going anterior to posterior through segment I in line of nephridial pores in II. Setae closely paired, ab beginning in II, cd in III or IV. Setal arrangement aa:ab:bc:cd:dd = 4:1:5:1:19. Clitellum in (dorsal XIII, XIV) XV-(XXV) XXVI, saddle-shaped ( Fig. 11A ). Genital markings in variable in III-X, intraclitellar in XIV-XXIII (ab position).Tubercula pubertatis linear in XX-½ XXVI ( Fig. 11B ). Male pores not recognised, and ovipores in XIV, almost in the border of 13/14, in diagonal to b. Spermathecal pores in 5/6, 6/7 and 7/8, inter segmental near nephridial pore. Nephridial pores begining in II, in CD line.

Internal anatomy ( Fig. 11C )

Septa: membranous. Gizzard: muscular and well developed in VI, displaced to X, with an average size (width × length) of 2.25 × 2.78 mm. Calciferous glands: eight pairs in VII-XIV, those in X and XI twice smaller than the others; all with peduncula attaching the inner middle of the gland to esophagus, kidney-shaped with lobular distal appendix, and composite tubular structure. Esophagus-intestine transition in XVIII/XIX; intestine without caeca. Typhlosole abruptly begining in XXV/XXVIII, structured as a long-folded lamella, occupying all the lumen. Hearts: six pairs, the two intestinal pairs in X-XI and well developed. Excretory apparatus holoic, nephridia with simple nephrostome. Testes sacs: midventral or hypoesophagic in X and XI, enclosing seminal vesicles. Seminal vesicles: two pairs in XI-XII; the first pair enclosed in septa, strap-shaped extending anteriously up to IX/X; the second pair extending to XIII, lobulated and attached to dorsal body wall. Spermathecae: three pairs, VI, VII and VIII, spatula-shaped without diverticula, of increasing size from VI to VIII.

REMARKS

Martiodrilus (B.) wayana Bartz & Decaëns , n. sp. belongs to the subgenus Botaria because of the presence of three pairs of spermathecae. It resembles other species of this subgenus which share a clitellum in XV-XXVI, including M. (B.) benhami , M. (B.) feijooi , M. (B.) gara , M. (B.) gravis , M. (B.) pano , M. (B.) vassae and M. (B.) motoloi Bartz & Decaëns , n. sp. It differs from all these species but M. (B.) pano , by the position of its tubercula pubertatis in XX-½ XXVI, instead of XX-XXV in M. (B.) benhami , ½ XIX-½ XXVI in M. (B.) feijooi, XIX , 2/3XIX-XXIII, ½ XXIV in M. (B.) gara, XX , 3/4XX- ½XXV in M. (B.) gravis, XXI-XXV in M. (B.) vassae and 1/3XX-½ XXV M. (B.) motoloi Bartz & Decaëns , n. sp. It further differs from M. (B.) pano by its smaller size (55 to 74 mm instead of 85 mm), by its brown instead of violet body pigmentation, and by the more anterior transition between esophagus and intestine. Martiodrilus (B.) wayana Bartz & Decaëns , n. sp. is clearly separated from other species of Martiodrilus from the Mitaraka Massif by its COI barcode ( Table 2 ). This species corresponds to OTU#083 in Maggia et al. (2021).

Figures

FIG. 11. — Martiodrilus (Botaria) wayana Bartz & Decaëns n. sp.: A, external and lateral view of the anterior body (arrows indicate the clitellum position); B, external and ventral view of the anterior body (arrows indicate the position of the tubercula pubertatis); C, dorsal dissection showing anterior internal anatomy; D, Habitat preferences; E, microhabitat preferences.All images from the holotype; CL, clitellum; DV, dorsal vessel;GZ, gizzard; IN, intestine; SP, spermathecae; SV, seminal vesicles; TP, tubercula pubertatis; N, total number of specimens in the dataset. Scale bars: 5 mm.