Eutyphoeus ukhrulensis Tiwari & Yadav, 2025

Eutyphoeus ukhrulensis Tiwari & Yadav sp. nov.

urn:lsid:zoobank.org:act:

Figs 6 View Fig , 14 View Fig ; Tables 1–2 View Table 1 View Table 2

Diagnosis

Length 82–120 mm, diameter 2.6–3.3 mm, segments 86–110. Prostomium combined pro-tanylobic. First dorsal pore in 10/11. Male genital orifices avestibulate, apenile, each male genital orifice distantly located on circular porophores centered at b, one pair of spermathecal pores in intersegment 7/8 at ab. Genital marking paired on xvi and xviii postsetal at b. Septa 6/7/8 thick. Intestinal caeca in xxvii, conical shape, ventrally directed. Holandric, seminal vesicle both present in ix and xii, posterior one extends up to xv. Three pairs of supra-intestinal glands. Prostate extends from xvii–xxi, prostatic duct long tubular with two loops. Bidiverticulate spermathecae. Penial setae straight except for little curvature to neck, ornamented with irregularly scattered large spines in anterior region, tip curved, pointed. Genital marking glands absent.

Etymology

Eutyphoeus ukhrulensis Tiwari & Yadav sp. nov. named after the Ukhrul district in the Shirui Kashong Peak area of Shirui National Park, Manipur, India.

Material examined

Holotype

INDIA – Manipur • clitellate (2–3 segments from the tail region cut for DNA extraction); Shirui Kashong (Peak), Shiroi National Park ; 25.1302° N, 94.4202° E; elev. 2106.19 m; 11 Oct. 2017; Shweta Yadav leg.; registration number – ZSI CZRC T/16 ; MNP17-1116-45A13 . GoogleMaps

Paratypes

INDIA – Manipur • 2 clitellates; same data as for holotype; MNP17-1120-45A17 , GoogleMaps MNP17-1131-45A29 GoogleMaps .

Description

Holotype

Length 82 mm, diameter 2.6 mm. Total number of segments ca 86. Prostomium combined pro-tanylobic. Color is non-uniform, with anterior 16 segments being dark wood brown, while posterior region is pale brown. First dorsal pore starts from intersegmental furrow of 10/11. Setae closely paired, aa: ab: bc: cd: dd = on xii, aa: ab: bc: cd: dd = on xxiv. Clitellum olpe-shaped with narrow anterior and broad middle body, ranges from ½ 13/17. Spermathecal pore slit-like aperture bounded with a little swollen lip at ab on 7/8. Female pore paired slightly median to a surrounded by separate circles, on segment xiv. Male genital region inverted hemispherical with flat base, avestibulate, apenile, each male genital orifice distantly located on circular porophores centered at b, bounded with thick circular swelling with fissured inner margin on segment xvii. Genital markings paired on xvi and xviii postsetal at b.

Septa 6/7/8 thick. Gizzard in segment viii–ix. Intestine starts from xv. Lateral intestinal caeca in xxvii, conical shape, ventrally directed. Typhlosole starts from xxvii. Ventral intestinal caeca 4–5 in xxxi–xxxvi. Three pairs of supra-intestinal glands in segment lxii–lxvi. Last pair of heart in xiii. Holandric male organ, testis sac in x and xi, annular, seminal vesicle both present in ix and xii, posterior one extends up to xv. Prostates occupy xvii–xxi, duct long tubular with two loops. Spermathecae bidiverticulate and club-shaped diverticula, one median and one lateral, each opening separately into the lumen of the duct, ampulla is relatively large and sac-like, while the duct is long and slender. Penial setae two per battery, length 1.2 mm, width 0.024 mm, straight except for little curvature to neck, ornamented with irregularly scattered large spines in anterior region, tip curved, pointed. Genital marking glands absent.

Remarks

Eutyphoeus ukhrulensis sp. nov. with diagnostic traits of the holandric male organ, spermathecal pores at ab and penial setae present closely resembles Eutyphoeus kashongensis sp. nov. However, it can be easily distinguished from E. kashongensis and other species of the group by the presence of male genital orifices on the circular porophores centered at b, genital marking glands absent and a club-shaped diverticulum ( Table 1 View Table 1 ).

DNA barcode

The holotype MNP17-1116-45A13, with process ID IEW1070-17, has been assigned the BIN number BOLD: ADL1324 based on COI barcode data. Eutyphoeus ukhrulensis sp. nov. has a mean intraspecific divergence of 1.14 % and a maximum intraspecific divergence of 1.47%. Its nearest neighbor species is Eutyphoeus tengnoupalensis sp. nov. with a nearest neighbor distance of 9.64 ( Table 2 View Table 2 ). All specimens of the novel species share the same BIN number.