Martiodrilus (Botaria) pavliceki 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 : 211

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

( Fig. 9 )

urn:lsid:zoobank.org:act:F97CD986-B5A0-42ED-B68F-277EC269F565

TYPE MATERIAL. — Holotype. French Guiana • Adult; 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-MI15-0283 ; MNHN.

OTHER MATERIAL EXAMINED. — French Guiana • 3 juvenile specimens; Tumuc-Humac, Mitaraka Massif , slope forest on DIADEMA project C trail; 2°14’5”N, 54°26’42”W; 377 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0058 , EW-MI15-0059 , EW-MI15-0060 ; MNHN .

ETYMOLOGY. — This species is named in honour of Tomas Pavlicek, in acknowledgement to his contribution for the study of earthworms in French Guiana and in other regions of the World.

ECOLOGY. — Martiodrilus (B.) pavliceki Bartz & Decaëns , n. sp. has been found in slope forests (75% of specimens) and in plateau forests (25%) ( Fig. 9D ). All specimens were collected in the organo-mineral soil ( Fig. 9E ).

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

DESCRIPTION

External morphology ( Fig. 9A, B )

Body shape cylindrical, with flattened tail. Body pigmentation dorsally yellow-brown before clitellum, brown after clitellum with anterior to posterior gradient, ventrally beige, clitellum light grey. Body length: 95 mm after ethanol fixation. Body mass: 1.08 g after ethanol fixation. Diameter: 4 mm in the preclitellar region, 5.2 mm in the clitellum, 4.4 mm in the postclitellar region. Number of segments: 156. 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 in III. Setal arrangement aa:ab:bc:cd:dd = 5:1:6:1:20. Clitellum in (dorsal XIV) XV-XXV (dorsal XXVI), saddle-shaped ( Fig. 9A ). Genital markings in V-XVIII, intraclitellar in XVIII-XXIV (ab position). Tubercula pubertatis linear in XIX-1/nXXV ( Fig. 9B ). Male pores not recognised, and ovipores not visible. Spermathecal pores not recognised. Nephridial pores begining in II, in C line.

Internal anatomy ( Fig. 9C )

Septa: membranous, slightly thickened in 9/10 to 16/17. Gizzard: muscular and well developed in VI, with an average size (width × length) of 2.70 × 2.90 mm. Calciferous glands: eight pairs, the first five pairs (VII-XI) small and globular to pear-shaped, the three next pairs (XII-XIV) two times larger and kidney-shaped; all with a lobular distal appendix. Esophagus-intestine transition in XVIII; intestine without caeca. Typhlosole abruptly begining in 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 and enclosed to testes sacs. Excretory apparatus holoic, nephridia with simple nephrostome. Testes sacs: periesophageal in X and XI, enclosing seminal vesicles, heart and calciferous gland. Seminal vesicles: two pairs in XI-XII; first pair extending to X and forming lobes in XI; second pair lobular extending to XIV without perforating septa. Spermathecae: three pairs in VII to IX, formed by a thin duct terminated by a round and flattened sac; last pair larger than the two first ones.

REMARKS

Martiodrilus (B.) pavliceki Bartz & Decaëns , n. sp. resembles species of subgenus Botaria which share a clitellum in XV-XXV, including Martiodrilus (Botaria) tchoukouchipan Decaëns & Bartz , n. sp., Martiodrilus (Botaria) bicolor (Michaelsen, 1913) , Martiodrilus (Botaria) euzonus ( Cognetti de Martiis, 1904) , M. (B.) gara , M. (B.) gravis , Martiodrilus (Botaria) minoriformis Zicsi, 1998 , Martiodrilus (Botaria) poncei Zicsi, 1998 and Martiodrilus (Botaria) tutus ( Cognetti de Martiis, 1904) . It differs from all these species, by the unique position of its tubercula pubertatis in XIX-1/nXXV. It is also noticeably larger than M. (B.) tchoukouchipan Decaëns & Bartz , n. sp. (95 mm vs 55-75 mm in the latter), and has flattened sac-like spermathecae whereas they are elongated in M. (B.) tchoukouchipan Decaëns & Bartz , n. sp. Martiodrilus (B.) pavliceki 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#076 in Maggia et al. (2021).

Figures

FIG. 9. — Martiodrilus (Botaria) pavliceki 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 the internal anatomy of the anterior body; 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.