Earthworms (Oligochaeta, Clitellata) of the Mitaraka range (French Guiana): commented checklist with description of one genus and eighteen species new to science Author Decaëns, Thibaud CEFE, Université de Montpellier, CNRS, EPHE, IRD, 1919 route de Mende, 34293 Montpellier Cedex 5 (France) thibaud. decaens @ cefe. cnrs. fr (corresponding author) thibaud.decaens@cefe.cnrs.fr Author Bartz, Marie Luise Carolina Municipal Center for Culture and Development - Organic Farming: Agriculture and Organic Production Partnership at Centre for Organic and Regenerative Agriculture, Centro Empresarial, Zona Industrial - 6060 - 182, Idanha-a-Nova (Portugal) and Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, 3041 Coimbra (Portugal) bartzmarie @ gmail. com bartzmarie@gmail.com Author Bartz, arolina Author Feijoo-Martínez, Alexander Facultad de Ciencias Ambientales, Universidad Tecnológica de Pereira, A. A. 097, Pereira (Colombia) Author Goulpeau, Arnaud CEFE, Université de Montpellier, CNRS, EPHE, IRD, 1919 route de Mende, 34293 Montpellier Cedex 5 (France) arnaud. goulpeau @ cefe. cnrs. fr goulpeau@cefe.cnrs.fr Author Lapied, Emmanuel Taxonomia Biodiversity Fund, 7 rue Beccaria, 72012 Paris (France) elapied @ yahoo. com elapied@yahoo.com Author Marchán, Daniel F. CEFE, Université de Montpellier, CNRS, EPHE, IRD, 1919 route de Mende, 34293 Montpellier Cedex 5 (France) danifermch @ gmail. com danifermch@gmail.com Author Maggia, Marie-Eugénie Department of Integrative Biology, University of Guelph, N 1 G 2 W 1 Guelph (Canada) mmaggia @ uoguelph. ca mmaggia@uoguelph.ca Author Papuga, Guillaume AMAP, Université de Montpellier, CIRAD, CNRS, INRAE, IRD, 1919 route de Mende, 34293 Montpellier Cedex 5 (France) guillaume. papuga @ umontpellier. fr papuga@umontpellier.fr Author James, Samuel W. Regenerative Agriculture Department, Maharishi International University, Fairfield, IA 52557 (United States) massemaj @ gmail. com massemaj@gmail.com text Zoosystema 2024 2024-04-09 46 9 196 244 https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/zoosystema2024v46a9.pdf journal article 299015 10.5252/zoosystema2024v46a9 5c6e0140-35bc-4e1e-9c60-4a7c2e340019 1638-9387 12551981 9AB092A6-A017-42EF-BEF3-44F533D6C88C Omodeoscolex tetraspermatheca Decaëns & Bartz , n. sp. ( Fig. 21 ) urn:lsid:zoobank.org:act: ECE72D9E-C9DB-48FC-B69C-A4676C1DE816 TYPE MATERIAL . — Holotype . French Guiana • Adult ; Tumuc-Humac , Mitaraka Massif , slope forest on DIADEMA project A trail, in decaying trunk; 2°14’16”N , 54°27’7”W ; 344 m a.s.l. ; III.2015 ; T. Decaëns , E. Lapied leg.; BOLD Sample ID: EW-MI15-0203 ; MNHN . FIG . 21. — Omodeoscolex tetraspermatheca Decaëns & Bartz 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 clitellum male field); C , habitat preferences; D , microhabitat preferences. All images from the holotype ; CL , clitellum; MF , male field; N , total number of specimens in the dataset. Scale bars: 1 mm . Paratypes . French Guiana • 1 adult specimen; Tumuc-Humac , Mitaraka Massif , slope forest on DIADEMA project A trail; 2°14’16”N , 54°27’7”W ; 344 m a.s.l. ; III.2015 ; T. Decaëns , E. Lapied leg.; BOLD Sample ID: EW-MI15-0204 ; CEFE . ETYMOLOGY . — The species name refers to the presence of four unpaired spermathecae. ECOLOGY . — The two known specimens of O. tetraspermatheca Decaëns & Bartz , n. sp. have been collected in a decaying trunk in a slope forest ( Fig. 21C, D ). DISTRIBUTION . — Omodeoscolex tetraspermatheca Decaëns & Bartz , n. sp. is only known from the Mitaraka Massif. DESCRIPTION External morphology ( Fig. 21A, B ) Body shape cylindrical, slightly flattened posteriously. Body pigmentation dorsally reddish-brown, ventrally light yellow-brown. Body length: 18 mm in the holotype , 26 mm in the paratype , after ethanol fixation. Body mass: 0.04 g after ethanol fixation in the holotype , same in the paratype . Diameter: 1.6 to 1.8 mm in the preclitellar region, 1.5 to 2.6 mm in the clitellum, 1.4 to 2.5 mm in the postclitellar region. Number of segments: 117 in the holotype , 122 in the paratype . Prostomium tanylobic. Dorsal pore: begining in 4/5. Setae closely paired, beginning in II, ab ventral and cd sub-ventral. Setal arrangement aa:ab:bc:cd = 5:1:5:1, dd > ½ Ø. Clitellum in XIII-XX, annular. Genital markings in two transversal lips in 3/4XVI and 1/4XX, delimiting a rectangular acanthodriline male field. Male pores one ventral pair in XVIII, and ovipores one pair in XIV, presetal, internally diagonal to a . Spermathecal pores not visible. Nephridial pores in line of C . Internal anatomy Septa : membranous. Gizzard: absent. Calciferous glands: two pairs in XIV and XV, with lamellar structure, kidney-shaped and attached through the middle inside. Esophagus-intestine transition in XVI. Typhlosole absent. Hearts: five pairs, last three intestinal bigger and last pair in XII. Excretory apparatus holoic. Prostatic glands: two pairs in XVII and XIX, irregular lobulated shape. Ovaries: one pair in XIII, grape bunch-shaped. Testes: two pairs in X and XI. Seminal vesicles: one pair, very small in XII, attached to septum 11/12. Spermathecae: four unpaired midventral in VI to IX, roundball-sac-shaped. REMARKS Omodeoscolex tetraspermatheca Decaëns & Bartz , n. sp. is characterized by the presence of four unpaired spermathecae in VI-IX, whereas in the other known species of the genus with unpaired spermathecae there are three ( O. touroulti Decaëns & Bartz , n. sp. and O. abamaensis Bartz & Decaëns , n. sp. ) ( Table 5 ). It also differs from the two previously described species by its COI-barcode ( Table 3 ). This species corresponds to OTU#086 in Maggia et al. (2021) .