Martiodrilus (Botaria) motoloi 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 : 209

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

( Fig. 8 )

urn:lsid:zoobank.org:act:5A2277F5-F203-4A95-8D39-A17776BC4D7A

TYPE MATERIAL. — Holotype. French Guiana • Adult; Tumuc-Humac, Mitaraka Massif , lowland forest on DIADEMA project A trail, in decaying trunk; 2°14’34”N, 54°27’54”W; 327 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0245 ; MNHN.

Paratypes. French Guiana • 1 adult specimen; Tumuc-Humac, Mitaraka Massif , lowland forest on DIADEMA project A trail; 2°14’34”N, 54°27’54”W; 327 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0240 ; CEFE • 1 adult specimen; same data as for preceding; EW-MI15-0246 ; MNHN .

OTHER MATERIAL EXAMINED. — French Guiana • 1 fragment, 2 juvenile specimens; Tumuc-Humac, Mitaraka Massif , lowland forest on DIADEMA project A trail; 2°14’34”N, 54°27’54”W; 327 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0241 , EW-MI15-0227 , EW-MI15-0250 ; MNHN.

ETYMOLOGY. — This species is named after the word ‘motoloi’, which means earthworm in the language of the Wayana Amerindian people.

ECOLOGY. — Martiodrilus (B.) motoloi Bartz & Decaëns , n. sp. has been found in lowland forests ( Fig. 8D ), in decaying trunks (50% of specimens), organo-mineral soil (16.67% of specimens), and in litter accumulation on granite rocks in decaying trunks (33.33% of specimens) ( Fig. 8G ).

DISTRIBUTION. — Martiodrilus (B.) motoloi Bartz & Decaëns , n. sp. is only known from the Mitaraka Massif.

DESCRIPTION

External morphology ( Fig. 8A, B )

Body shape cylindrical. Body pigmentation dorsally dark red-brown, ventrally light brown. Body length: 52 mm in the holotype, 42 to 56 mm in the paratypes, after ethanol fixation. Body mass: 0.19 g after ethanol fixation in the holotype, 0.14 to 0.21 g in the paratypes. Diameter: 3 to 3.6 mm in the preclitellar region, 3.1 to 3.9 mm in the clitellum, 2.8 to 3.4 mm in the postclitellar region. Number of segments: 120 in the holotype, 106 to 115 in the paratypes. Prostomium proepilobic. One pair of longitudinal grooves going anterior to posterior through segment I in line of nephridial pores. Setae closely paired, ab beginning in II, cd begining in III. Setal arrangement aa:ab:bc:cd:dd = 6:1:8:1:26. Clitellum in (dorsal XIV) XV-½ ½XXVI, saddle-shaped ( Fig. 8A ). Genital markings variable in V-XIII, intraclitellar in XIV-XXIII and then continuing in XXVI-XXVIII (ab position). Tubercula pubertatis linear in 1/3XX-½XXV ( Fig. 8B ). Male pores not recognised, and ovipores not visible. Spermathecal pores in 5/6, 6/7 and 7/8, near nephridial pore. Nephridial pores begining in II, in D line.

Internal anatomy ( Fig. 8C )

Septa: membranous. Gizzard: muscular and well developed in VI, with an average size (width × length) of 1.35 × 2.25 mm. Calciferous glands: eight pairs in VII-XIV, with X and XI smaller than the others; all kidney-shaped with lobular distal appendix and composite tubular structure. Esophagus-intestine transition in XVII; intestine without caeca.Typhlosole abruptly begining in XXIV/XXV, structured as a long thin folded lamella occupying all the lumen. Hearts: five pairs in VII-XI, the two intestinal pairs in X-XI larger. Excretory apparatus holoic, nephridia with simple nephrostome.Testes sacs: midventral or hypoesophagic in X and XI, enclosing the seminal vesicles. Seminal vesicles: two pairs in XI-XII, forming large lobulated masses; the first pair enclosed in septa with hearts, calciferous glands and testes sacs in X, and forming a wing extending anteriously up to IX-X; the second pair extending posteriously up to XIII/XV. Spermathecae: three pairs, VI, VII, VIII; elongated sacs little wavy, without diverticula.

REMARKS

Martiodrilus (B.) motoloi 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 Martiodrilus (Botaria) benhami ( Cognetti de Martiis, 1904) , Martiodrilus (Botaria) feijooi Zicsi, 1998 , M. (B.) gara , Martiodrilus (Botaria) gravis ( Cognetti de Martiis, 1904) , Martiodrilus (Botaria) pano Righi, 1992 , M. (B.) vassae and Martiodrilus (Botaria) wayana Bartz & Decaëns , n. sp. It differs from all these species but M. (B.) gravis and M. (B.) benhami by the position of its tubercula pubertatis in 1/3XX-½XXV. It can be distinguished from both M. (B.) gravis and M. (B.) benhami by its smaller size (42 to 56 mm instead of more than 90 mm and 170 mm, respectively), and by its darker pigmentation. Martiodrilus (B.) motoloi 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#088 in Maggia et al. (2021).

Figures

FIG. 8. — Martiodrilus (Botaria) motoloi 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: 2.5 mm.