Martiodrilus ( Maipure ) luminescens Decaëns & Bartz, 2024

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

( Fig. 12 View FIG )

urn:lsid:zoobank.org:act:

TYPE MATERIAL. — Holotype. French Guiana • Adult; Tumuc-Humac, Mitaraka Massif , rocky savannah #2 on Sommet en Cloche Inselberg , in terrestrial bromeliad roots; 2°13’58”N, 54°27’39”W; 427 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0319 ; MNHN. GoogleMaps

Paratypes. French Guiana • 1 adult specimen; Tumuc-Humac, Mitaraka Massif , rocky savannah #2 on Sommet en Cloche Inselberg ; 2°13’58”N, 54°27’39”W; 427 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0318 ; CEFE GoogleMaps • 1 adult specimen; Tumuc-Humac, Mitaraka Massif , slope forest on DIADEMA project D trail; 2°13’40”N, 54°27’14”W; 339 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0254 ; CEFE GoogleMaps • 1 adult specimen; Tumuc-Humac, Mitaraka Massif , slope forest on trail to Sommet en Cloche Inselberg ; 2°14’6”N, 54°27’11”W; 351 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0194 ; MNHN GoogleMaps .

OTHER MATERIAL EXAMINED. — French Guiana • 2 juvenile specimens; Tumuc-Humac, Mitaraka Massif , rocky savannah #2 on Sommet en Cloche Inselberg ; 2°13’58”N, 54°27’39”W; 427 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0329 , EW-MI15-0330 ; MNHN GoogleMaps • 2 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-MI15-0202 , EW-MI15-0209 ; MNHN GoogleMaps • 3 juvenile specimens, 1 cocoon; Tumuc-Humac, Mitaraka Massif , slope forest on DIADEMA project D trail; 2°13’40”N, 54°27’14”W; 339 m a.s.l.; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0263 , EW-MI15-0264 , EW-MI15-0269 , EW-MI15-0276 ; MNHN GoogleMaps • 4 juvenile 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-MI15-0337 , EW-MI15-0339 , EW-MI15-0340 , EW-MI15-0376 ; MNHN GoogleMaps • 1 juvenile specimen; Tumuc-Humac, Mitaraka Massif , tropical rainforest on crowned mountain; unknown; unknown; III.2015; T. Decaëns, E. Lapied leg.; BOLD Sample ID: EW-MI15-0132 ; MNHN .

ETYMOLOGY. — The name of the species refers to the bioluminescent character observed on one of the type specimens during field sampling.

ECOLOGY. — Martiodrilus ( M.) luminescens Decaëns & Bartz , n. sp. has been found mostly in slope forests (41.18% of specimens) and in inselberg rocky savannahs (23.53%) and transition forests (23.53 ( Fig. 12F View FIG ). Most specimens were collected in decaying trunks (35.29%), in litter accumulations on granite rocks (23.53%) and in the root mat of terrestrial bromeliads (23.53%) ( Fig. 12G View FIG ). Cocoons are tan yellow, spherical, 10 mm in diameter, with two mucrons at the anterior and posterior ends. A specimen moving at night on the surface of the ground was observed producing a green bioluminescence.

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

DESCRIPTION

External morphology ( Fig. 12A, B View FIG )

Body shape cylindrical, slightly flattened after clitellum. Body pigmentation dorsal grey-brown, ventral light-brown. Body length: 109 mm in the holotype, 105 to 170 mm in the paratypes (average: 139 mm; n = 3), after ethanol fixation. Body mass: 1.87 after ethanol fixation in the holotype, 1.84 to 5.38 g in the paratypes (average: 3.90 g; n = 3). Diameter: 5.3 to 7 mm in the preclitellar region, 9 to 10.3 mm in the clitellum, 6.5 to 8 mm in the postclitellar region. Number of segments: 108 in the holotype, 85 to 136 in the paratypes (average: 118.3; n = 3). Prostomium proepilobic. Setae closely paired, ab and bc beginning in IV. Setal arrangement aa:ab:bc:cd:dd = 7:1:14:1:42. Clitellum in (XIV) ½ XV-XXVI, saddle-shaped ( Fig. 12A View FIG ). Genital markings in in V-IX, intraclitellar in XVI, XIX and XXIV ( ab position). Tubercula pubertatis linear in XXI-XXVII ( Fig. 12B View FIG ). Male pores not recognised, and ovipores not visible. Spermathecal pores invisible. Nephridial pores begining in II, in CD line.

Internal anatomy ( Fig. 12 View FIG C-E)

Septa: membranous. Gizzard: muscular and well developed in VI, but displaced to X, XI and XII, with an average size (width × length) of 4.27 × 5.40 mm. Calciferous glands: eight pairs in VII-XIV, yellow bean-shaped with a brown round distal appendix, and composite tubular structure ( Fig. 12E View FIG ). Esophagus-intestine transition in XVII; intestine without caeca. Typhlosole absent. Hearts: six pairs, the two 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, but sac enclosing calciferous glands, heart and seminal vesicles. Seminal vesicles: two pairs in XI and XII-XVI, lobulated ( Fig. 12E View FIG ). Spermathecae: four pairs, VI, VII, VIII and IX, without diverticula ( Fig. 12D View FIG ).

REMARKS

Martiodrilus ( M.) luminescens Decaëns & Bartz , n. sp. belongs to the subgenus Maipure due to the presence of four pairs of spermathecae. It is related to other species sharing a clitellum in XV-XXVI, such as Martiodrilus ( Maipure) micrurus Cognetti de Martiis, 1904 , Martiodrilus ( Maipure) potarensis Rosa, 1895 , Martiodrilus ( Maipure) ophioides ( Cognetti de Martiis, 1904) and Martiodrilus ( Maipure) rigeophilus Cognetti de Martiis, 1904 . It differs from the first two species in the position of the tubercula pubertatis in XXI-XXVII instead of ½ XX-½ XXV in M. ( M.) Micrurus, XXI-XXVI in M. ( M.) potarensis, XX-XXVI in M. ( M.) ophioides and XX-½ XXVI in M. ( M.) rigeophilus . Martiodrilus ( M.) luminescens Decaëns & Bartz , n. sp. is also significantly smaller than M. ( M.) potarensis ( 109-170 mm instead of 380 mm), and larger than M. ( M.) rigeophilus and M. ( M.) ophioides which have body sizes ranging from 70 to 80 mm and from 100 to 120 mm, respectively. Furthermore, both of these two last species are known from high-altitude montane ecosystems (above 4000 and 2500 m a.s.l., respectively) which are quite different from the type habitat in which M. ( M.) luminescens Decaëns & Bartz , n. sp. was found. This species corresponds to OTU#082 in Maggia et al. (2021).