Martiodrilus (Maipure) mitaraka Decaëns & Bartz, n. sp.

(Fig. 13)

urn:lsid:zoobank.org:act: DC414303-8A7E-4399-8E0B-F8048B5490FC

TYPE MATERIAL. — Holotype. French Guiana • Adult; Tumuc-Humac, Mitaraka Massif, slope forest on trail to Sommet en Cloche Inselberg, in the soil; 2°14’6”N, 54°27’11”W; 352 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0360; MNHN.

Paratypes. French Guiana • 9 adult specimens; Tumuc-Humac, Mitaraka Massif, plateau forest at base camp; 2°14’2”N, 54°27’1”W; 331 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0173, EW-MI15-0178, EW-MI15-0179, EW-MI15-0196, EW-MI15-0361, EW-MI15-0365, EW-MI15-0366, EW-MI15-0367, EW-MI15-0180; MNHN • 1 adult specimen; Tumuc-Humac, Mitaraka Massif, plateau forest on DIADEMA project C trail; 2°13’58”N, 54°26’38”W; 449 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0297; CEFE • 1 adult specimen; 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-MI15-0369; CEFE • 2 adult specimens; Tumuc-Humac, Mitaraka Massif, transition forest # 1 Sommet en Cloche Inselberg; 2°13’54”N, 54°27’39”W; 401 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0335, EW-MI15-0334; CEFE • 1 adult specimen; Tumuc-Humac, Mitaraka Massif, tropical rainforest on crowned mountain; unknown; unknown; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0128; MNHN .

OTHER MATERIAL EXAMINED. — French Guiana • 1 cocoon; Tumuc-Humac, Mitaraka Massif, plateau forest at base camp; 2°14’2”N, 54°27’1”W; 331 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0371; MNHN • 1 juvenile specimen; Tumuc-Humac, Mitaraka Massif, plateau forest on DIADEMA project C trail; 2°13’58”N, 54°26’38”W; 449 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0293; MNHN • 3 juvenile specimens; 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-MI15-0210, EW-MI15-0211, EW-MI15-0212; MNHN • 3 juvenile specimens, 1 cocoon; Tumuc-Humac, Mitaraka Massif, transition forest # 1 Sommet en Cloche Inselberg; 2°13’54”N, 54°27’39”W; 401 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW- EW-MI15-0333, EW-MI15-0341, MI15-0350, EW-MI15-0377; MNHN • 2 juvenile specimens; Tumuc-Humac, Mitaraka Massif, tropical rainforest on crowned mountain; NA/NA; NA m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0130, EW-MI15-0131; MNHN .

ETYMOLOGY. — This species is named in reference to the Mitaraka Massif where the type material has been collected.

ECOLOGY. — Martiodrilus (M.) mitaraka Decaëns & Bartz, n. sp. has been found mostly in plateau forests (61.54% of specimens) and in inselberg transition forests (23.08%) (Fig. 13E). Most specimens were collected in the organo-mineral soil (61.54%) and to a lower extent in litter accumulation on granit rocks (19.23%) and in decaying trunks (19.23%) (Fig. 13F). Cocoons are tan yellow, spherical, 7-10 mm in diameter, with two mucrons at the anterior and posterior ends.

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

DESCRIPTION

External morphology (Fig. 13A, B, D)

Body shape cylindrical, slightly flattened after clitellum. Body pigmentation dorsally red-brown, ventrally light brown. Body length: 130 mm in the holotype, 100 to 140 mm in the paratypes (average: 116.7 mm; n = 3), after ethanol fixation. Body mass: 2.13 g after ethanol fixation in the holotype, 1.59 to 2.04 g in the paratypes (average: 1.74 g; n = 3). Diameter: 5 to 6.7 mm in the preclitellar region, 6.5 to 7.6 mm in the clitellum, 5.9 to 6 mm in the postclitellar region. Number of segments: 173 in the holotype, 107 to 167 in the paratypes (average: 137; n = 3). Prostomium proepilobic. One pair of longitudinal grooves going anterior to posterior through segment I in line of nephridial pores (Fig. 13D). Setae closely paired, ab beginning in II, cd in III or IV. Setal arrangement aa:ab:bc:cd:dd = 7:1:9:1:25. Clitellum in (dorsal ½ XIII, XIV) XV (XVI)-XXV, saddle-shaped to annular (Fig. 13A). Genital markings variable in V-VIII and in X, intraclitellar in XV and XXIII (ab position).Tubercula pubertatis linear in (XIX) XX-(XXV) XXVI (Fig. 13B). Male pores not recognised, and ovipores in XIV, pre-clitellar diagonally to b. Spermathecal pores in 4/5, 5/6, 6/7 and 7/8. Nephridial pores begining in II, in CD line.

Internal anatomy (Fig. 13C)

Septa: membranous, slightly thickened in 6/7 to 16/17. Gizzard: muscular and well developed in VI, but displaced to X, XI, with an average size (width × length) of 4.50 × 4.90 mm. Calciferous glands: eight pairs in VII-XIV, the last three pairs two to three times the size of the others; all kidney-shaped with a lobular distal appendix and tubular composite structure. Esophagus-intestine transition in XVIII; intestine without caeca. Typhlosole abruptly begining in XXV/XXVII, structured as a long thin folded lamella occupying all the lumen. Hearts: six pairs, the two last intestinal pairs in X-XI well developed and enclosed in the testes sacs. Excretory apparatus holoic, nephridia with simple nephrostome.Testes sacs:periesophageal in X and XI. Seminal vesicles: two pairs in XI-XII; first pair enclosed in septa with hearts, calciferous glands and testes sacs in X, and forming a wing extending anteriously up to IX; the second pair going until XV/XVI. Spermathecae: four pairs, V, VI, VII, VIII; without diverticula.

REMARKS

M. (M.) mitaraka Decaëns & Bartz, n. sp. belongs to the subgenus Maipure due to the presence of four pairs of spermathecae. It is similar to the species of this subgenus whose clitellum is in XV-XXV: Martiodrilus (Maipure) ecuadoriensis (Benham, 1892), Martiodrilus (Maipure) palmirus Zicsi & Feijoo,1994, and M. (M.) ophioides . It also shares with the latter the position of the tubercula pubertatis in XX-XXVI. It differs from these three species, however, in the position of spermathecal pores in 4/5-7/8, instead of in this species 5/6-8/ 9 in the others. This species corresponds to OTU#081 in Maggia et al. (2021).