Martiodrilus (Botaria) lavellei Decaens & Bartz 2024, n. sp.
Creators: name: Decaëns, Thibaud
name: Bartz, Marie Luise Carolina
name: Bartz, arolina
name: Feijoo-Martínez, Alexander
name: Goulpeau, Arnaud
name: Lapied, Emmanuel
name: Marchán, Daniel F.
name: Maggia, Marie-Eugénie
name: Papuga, Guillaume
name: James, Samuel W.
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Clitellata
Crassiclitellata
Glossoscolecidae
Martiodrilus
Martiodrilus lavellei

description: Martiodrilus (Botaria) lavellei Decaëns & Bartz, n. sp.
(Fig. 7)
urn:lsid:zoobank.org:act: AFE58CB8-CEE3-46FE-8576-0259AAF5E274
TYPE MATERIAL. — Holotype. French Guiana • Adult; Tumuc-Humac, Mitaraka Massif, tropical rainforest on DIADEMA project A trail, in the soil; 2°14’27”N, 54°27’15”W; 359 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0105; MNHN.
ETYMOLOGY. — This species is named in honour of Patrick Lavelle, in acknowledgement to his contribution for the study of tropical earthworm ecology.
ECOLOGY. — This species is only known from the holotype specimen, which has been collected in the organo-mineral soil of a plateau forests (Fig. 7D, E).
DISTRIBUTION. — Martiodrilus (B.) lavellei Decaëns & Bartz, n. sp. is only known from the Mitaraka Massif.
DESCRIPTION
External morphology (Fig. 7A, B)
Body shape cylindrical. Body pigmentation dorsally light brown, ventrally beige. Body length: 56 mm after ethanol fixation. Body mass: 0.19 g after ethanol fixation. Diameter: 3.4 mm in the preclitellar region, 4.2 mm in the clitellum, 2.5 mm in the postclitellar region. Number of segments: 131. 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 = 8:1:10:2:34. Clitellum in (dorsal XV) XVI-XXV, saddle-shaped (Fig. 7A). Genital markings in V-XXIII, intraclitellar in XV-XXV (ab position). Tubercula pubertatis linear in 1/4 XX-½ XXV (Fig. 7B). 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 III, in CD line.
Internal anatomy (Fig. 7C)
Septa: membranous. Gizzard: muscular and well developed in VI, 1.80 × 2.30 mm (width × length). Calciferous glands: eight pairs, in VII-XIV with tubular composite structure. Esophagus-intestine transition in XVIII/XIX; intestine without caeca.Typhlosole abruptly begining in XXVI, structured as a long thin folded lamella occupying all the lumen. Hearts: five pairs, the two intestinal pairs well-developed in X-XI. Excretory apparatus holoic, nephridia with simple nephrostome. Testes sacs: semi-periesophageal in X and XI, enclosing basal part of hearts, calciferous glands and seminal vesicles. Seminal vesicles: two pairs in XI-XII, small lobulated occupying their segments only. Spermathecae: three pairs, VI, VII, VIII; ovoid elongated without diverticula.
REMARKS
Martiodrilus (B.) lavellei Decaëns & Bartz, n. sp. belongs to the subgenus Botaria because of the presence of three pairs of spermathecae. It differs from the majority of species in the subgenus by its clitellum beginning in XVI, a position which it shares only with the two Guyanese species Martiodrilus (Botaria) dewynteri Csuzdi & Pavlicek, 2011 and Martiodrilus (Botaria) helleri (Michaelsen, 1918). Although this needs to be confirmed on a larger number of specimens, the clitellum of M. (B.) lavellei Decaëns & Bartz, n. sp. seems less extended posteriously than in these two species, ending in XXV in the holotype specimen instead of XXVI to ½ XXVI. The position of tubercula pubertatis also differs among these species: 1/4 XX-½ XXV in M. (B.) lavellei Decaëns & Bartz, n. sp. instead of ½ XXI-½XXVI in M. (B.) dewynteri and XX-½ XXVI in M. (B.) helleri. Furthermore, M. (B.) lavellei Decaëns & Bartz, n. sp. is significantly smaller than M. (B.) helleri, and appears to have a lighter body pigmentation than M. (B.) dewynteri (light brown instead of brown-violet). Martiodrilus (B.) lavellei Decaëns & Bartz, 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#080 in Maggia et al. (2021).
description: Published as part of 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, pp. 196-244 in Zoosystema 46 (9) on pages 206-209, DOI: 10.5252/zoosystema2024v46a9, http://zenodo.org/record/12551981