Eutyphoeus tengnoupalensis Tiwari & Yadav, 2025

Eutyphoeus tengnoupalensis Tiwari & Yadav sp. nov.

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Figs 10 View Fig , 14 View Fig ; Tables 1–2 View Table 1 View Table 2

Diagnosis

Length 60–92 mm, diameter 3.7–4 mm, segments 121–156. Prostomium tanylobic. First dorsal pore in 10/11. Male genital orifices bivestibulate, apenile, on xvii, lateral to b, under bilobed genital papillae. One pair of spermathecal pores in intersegment 7/8 lateral to b surrounded by 4–5 small circular genital markings. Genital markings on xvi and xvii paired, presetal at b, on xvii single, median, circular. On vii segment all postsetal, one median and 2 lateral to b. On viii segment presetal, one at b and 2 lateral to b. Septa 6/7/8 present. Intestinal caeca in xxvi, small oar-shaped, ventrally directed. Holandric, seminal vesicles present in ix and xii, those of xii extend up to xiii or xiv. Three pairs of supra-intestinal glands. Prostate tubular, duct small, twisted loop-like. Bidiverticulate spermathecae. Penial setae ornamented, hook-like, shaft with slight curvature of anterior region, pointed tip.

Etymology

The species name ‘ tengnoupalensis ’ is a Latinized adjective derived from ‘Tengnoupal’, the location where this species was discovered, specifically the Yangoupokpi-Lokchao Wildlife Sanctuary in Tengnoupal, Manipur.

Material examined

Holotype

INDIA – Manipur • clitellate (few segments from caudal region taken for DNA extraction); Tengnoupal, Yangoupokpi-Lokchao Wildlife Sanctuary ; 24.3831° N, 94.1492° E; 10 Oct. 2017; Shweta Yadav leg.; registration number – ZSI CZRC T/12; MNP17-1079-44A5 . GoogleMaps

Paratypes

INDIA – Manipur • 2 clitellates; same data as for holotype; MNP17-1079-44A5 , GoogleMaps MNP17-1080-44A6 GoogleMaps .

Other material

INDIA – Manipur • 2 specs; same data as for holotype; MNP17-1078-44A4 , GoogleMaps MNP17-1090-44A16 GoogleMaps .

Description

Holotype

Length 80 mm, diameter 3.77 mm. Total number of segments 128. Prostomium tanylobic. Color dark beige brown, uniformly pigmented throughout body, with only openings having a slightly lighter lining. First dorsal pore starts from intersegmental furrow of 10/11. aa: ab: bc: cd: dd = 3.21: 1.39: 2.66: 1: 13.33 on xii and aa: ab: bc: cd: dd = on xxiv. Clitellum annular, slightly broadened in xvi–xvii, covers ½ xiii to ½ xvii. Spermathecal pores on intersegmental region of 7/8, lateral to b, slit-like aperture surrounded by 4–5 small circular genital markings. Female pore slightly median to a, paired, presetal on xiv in distinct white elongated patch with slight demarcation in centre. Male genital region dumbbell-shaped, male genital orifices bivestibulate, apenile, on xvii, lateral to b, under bilobed genital papillae (sharp demarcation present between two lobes of papillae). Genital markings on xvi and xvii paired, presetal at b, on xvii single, median, circular. On vii segment all postsetal, one median and two lateral to b. On viii segment presetal, one at b and two lateral to b.

Septa 6/7/8 present. Gizzard in segment viii. Intramural calciferous gland present in segment xii. Lateral intestinal caeca present in xxvi, small oar-shaped, ventrally directed. Ventral intestinal caeca 4–5 (?) in number from segment xxx, intestine broken. Typhlosole start from xxvi. Three pairs of supra-intestinal glands present in segments lxv–lxx. Last pair of hearts in xiii. Holandric, testis sacs in x and xi, annular, seminal vesicles in ix and xii those of xii extends up to xiii or xiv. Intestine begins from xiv. Prostates tubular, on segment xvii and extend up to xxi–xxii, duct small, twisted loop-like. Spermathecae bidiverticulate, lateral, 5 spheroidal genital markings attached in a ring-like manner directly to short wide duct, ampulla sac somewhat flat, diverticula digitiform, distantly situated in opposite direction, opens separately into duct. Penial setae two per battery, length 1.54 mm, width 0.036 mm, ornamented, hook-like, shaft with slight curvature of anterior region, pointed tip.

Variation

In paratype MNP17-1080-44A6, an additional pair of genital marking present on xv, postsetal at b.

Remarks

The novel species is classified within the hastatus group ( Gates 1958) and appears to be diverged from E. yangoupokpensis sp. nov. due to its comparable spermathecal pore and arrangement of genital markings. It is characterized by its non-pentagonal shape of vestibula and penial setae with a pointed tip ( Table 1 View Table 1 ).

DNA barcode

The COI barcode data of the holotype MNP17-1079-44A5 (process ID IEW1033-17), has been assigned the BIN number BOLD: ADL1715. Eutyphoeus tengnoupalensis sp. nov. has a mean intraspecific divergence of 0.38% and a maximum intraspecific divergence of 0.76%. Its nearest neighbor species is Eutyphoeus yangoupokpensis sp. nov. with a nearest neighbor distance of 8.22 ( Table 2 View Table 2 ). All specimens of the novel species share the same BIN number.