Eutyphoeus kwathensis Tiwari & Yadav, 2025

Eutyphoeus kwathensis Tiwari & Yadav sp. nov

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Figs 11 View Fig , 14 View Fig ; Tables 1–2 View Table 1 View Table 2

Diagnosis

Length 63–80 mm, diameter 2.5–3 mm, segments 142–170. Prostomium tanylobic. First dorsal pore in 11/12. Male genital orifices avestibulate, apenile, slit-like aperture at ab. One pair of spermathecal pores in intersegment 7/8 lateral to b. Genital markings with dark inner circle followed by fine translucent ring which is further encircled with whitish large swollen ring, all postsetal, on xi paired at b projected towards lateral, on xiv single on one side at ab, on xv, xvi paired at ab. Septa 5/6/7/8 present. Intestinal caeca simple, ventrally directed, on segment xxvi. Metandric male organs, testis sac annular on segment xi, seminal vesicle one pair in segment xii. Three pairs of supra-intestinal glands. Prostate extends from segment xvi to xx, duct looped twice or thrice. Bidiverticulate spermathecae. Penial setae serpentine, ornamented anteriorly with circle of strips, tip spoon-shaped with small bulbous end.

Etymology

The species epithet ‘ kwathensis ’ denotes a species that is associated with the Kwatha range of Yangoupokpi-Lokchao Wildlife Sanctuary in Manipur, which is its type locality. This nomenclature not only aids in taxonomic classification but also acknowledges the sanctuary’s role in preserving the wide range of biodiversity and facilitates scientific exploration.

Material examined

Holotype

INDIA – Manipur • clitellate (few caudal segments excised for DNA extraction); Yangoupokpi-Lokchao Wildlife Sanctuary; 24.2542° N, 94.2992° E; elev. 418.8 m; 8 Oct. 2017; Shweta Yadav leg.; registration number – ZSI CZRC T/5; MNP17-1044-42A3 . GoogleMaps

Paratypes

INDIA – Manipur • 2 clitellates; same data as for holotype; MNP17-1045-42A4 , GoogleMaps MNP17-1046-42A5 GoogleMaps .

Other material

INDIA – Manipur • 1 spec.; same data as for holotype; MNP17-1042-42A1 GoogleMaps • 1 spec.; Kwatha range , Yangoupokpi-Lokchao Wildlife Sanctuary ; 24.3238° N, 94.2923° E; 9 Oct. 2017; Shweta Yadav leg.; MNP17-1072-43A12 GoogleMaps .

Description

Holotype

Length 63 mm, diameter 2.6 mm. Total number of segments 142. Prostomium tanylobic. Color non uniform, anterior 4–5 segments rosy brown while, rest of body cinnamon brown. First dorsal pore starts from intersegmental furrow of 11/12. Setae small and setae c and d not easily observable, not viable to measure all of setal distance on segment xii and xxiv, thus distance aa:ab = 2.48: 1 at xii and 2.81: 1 at xxiv. Clitellum annular, extends from segment ½ xiii to ¼ xvii. Paired spermathecal pores on intersegmental region of 7/8, lateral to b. Female pores paired, presetal slightly median to a in separate patches on segment xiv. Male genital orifices avestibulate, apenile, slit-like aperture at ab on segment xvii. Genital markings with dark inner circle followed by fine translucent ring, further encircled with whitish large swollen ring, all postsetal, on xi paired at b projected towards lateral, on xiv single on one side at ab, on xv, xvi paired at ab.

Septa 5/6/7/8 present. Gizzard in segment viii occupies little vii and extends up to ix. One pair of intramural calciferous glands on segment xii. Intestine begins from segment xiv. Lateral intestinal caeca simple, ventrally directed, on segment xxvi. Ventral intestinal caeca 4–5 in number begins from segment xxxi. Three pairs of supra-intestinal glands present in segments lxii–lxv. Last pair of hearts in xiii. Metandric, testis sacs annular on segment xi, seminal vesicle one pair in xii. Prostates extend from segment xvi to xx, duct looped twice or thrice. Spermathecae bidiverticulate, lateral, with two seminal chambers, tubular outwardly directed diverticula opens through common aperture into duct, ampulla oval-shaped, duct short. Penial setae 3–4 per battery, serpentine, length 2.5–2.7 mm, width 0.036 mm, ornamented anteriorly with circle of strips, tip spoon-shaped with small bulbous end.

Variation

The paratype MNP17-1045-42A4 exhibits variation in number and position of genital markings. These markings are paired in x, xiv and xv, postsetal at b, on xvi single on one side. In contrast, paratype MNP17-1046-42A5 lacks genital markings on segments xiv and xvi, but has a single marking on xv.

Remarks

The novel species Eutyphoeus kwathensis sp. nov. having traits such as metandric male organs, paired female pores, lateral intestinal caeca ventrally directed and bidiverticulate spermathecae resembles the characteristics of E. turaensis Stephenson, 1920 and can be differentiated by the presence of serpentine penial setae with a small bulbous end and a spoon-shaped tip ( Table 1 View Table 1 ).

DNA barcode

The holotype MNP17-1044-42A3 (process ID IEW998-17) has been assigned the BIN number BOLD: ADL1718 based on the COI barcode data. Eutyphoeus kwathensis sp. nov. has a mean intraspecific divergence of 0.15% and a maximum intraspecific divergence of 0.31%. Its nearest neighbor species is Eutyphoeus assamensis with a nearest neighbor distance of 18.82 ( Table 2 View Table 2 ). All specimens of the novel species share the same BIN number.