Eutyphoeus baronongini Tiwari & Yadav, 2025

Eutyphoeus baronongini Tiwari & Yadav sp. nov.

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Figs 8 View Fig , 14 View Fig ; Tables 1–2 View Table 1 View Table 2

Diagnosis

Length 75–90 mm, diameter 4.2–5 mm, segments 110–156. Prostomium combined pro-tanylobic. First dorsal pore in 10/11. Male genital orifices bivestibulate, apenile, at b under the knob-like rounded papillae. One pair of spermathecal pores in intersegment 7/8 at b extends laterally. Female pore paired, presetal, median to a. Genital marking single median in xvii and xviii triangular in shape. Also, on xviii a single circular marking on right side, post setal, at a. Septa 6/7/8 absent. Intestinal caeca dorsally directed. Holandric, paired seminal vesicles in ix and xii, posterior one extends up to xvi. Four pairs of supra-intestinal glands. Prostate tubular, duct narrow, twisted takes one round before opening into the vestibule. Bidiverticulate spermathecae. Penial setae irregular triangular tooth-like ornamentation, slightly bent on anterior end, with blunt tip.

Etymology

Combining ‘baro’ (from ‘bar-tailed’) and ‘nongini’ to highlight the local name associated with the bird, tying the species to the regional identity. The etymology acknowledges that the Nongin Humes Bar-tailed Pheasant, the state bird, resides in the Shiroi National Park, which is the original location where this species was first identified.

Material examined

Holotype

INDIA – Manipur • clitellate (few segments from caudal region taken 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/13; MNP17-1105-45A2 . GoogleMaps

Paratypes

INDIA – Manipur • 2 clitellates; same data as for holotype; MNP17-1106-45A3 , GoogleMaps MNP17-1115-45A12 GoogleMaps .

Other material

INDIA – Manipur • 7 specs; same data as for holotype; MNP17-1124-45A21 , GoogleMaps MNP17-1126-45A23 , GoogleMaps MNP17-1127-45A24 , GoogleMaps MNP17-1128-45A26 , GoogleMaps MNP17-1132-45A30 , GoogleMaps MNP17-1133-45A31 , GoogleMaps MNP17-1136- 45A34 GoogleMaps .

Description

Holotype

Length 75 mm, diameter 4.2 mm. Total number of segments 110. Color is uniformly pigmented woody cedar brown, with prostomium being slightly darker. First dorsal pore starts from intersegmental furrow of 11/12. Prostomium combined pro-tanylobic. Setae small, aa: ab: bc: cd: dd = 2.29: 1.20:2.24:1: 11.19 on xii. Clitellum barrel-shaped posteriorly widened, occupying ⅔ xiii to xvii segment. Spermathecal pore on intersegmental region of 7/8 at b extends laterally, surrounded by fissured thick swollen lips. Female pore in xiv, paired, presetal, median to a, in common elliptical white circle. Male genital region bowl-shaped, male genital orifices bivestibulate, apenile, at b under knob-like rounded papillae. In one paratype, porophores protruded during preservation and hid the vestibule, gave impression of being avestibulate. Muscular composition of papillae tough. Genital marking single median in xvii and xviii triangular in shape. Also, on xviii single circular marking present on right side, post setal, at a.

Septa 6/7/8 absent. Gizzard in space between septa 5/6–8/9. Intramural calciferous gland in xii. Intestine begins in xv. Lateral intestinal caeca present on segment xxvii dorsally directed. Ventral intestinal caeca 13 in number, begins from xxxii–xlvi. Typhlosole (?). Supra-intestinal glands 4 pairs in segment lx– lxv. Last pair of hearts in xiii. Holandric, testis sacs annular in x and xi, seminal vesicles in ix and xii, posterior one extends up to xvi. Prostates in xvii, extends up to xx–xxi, duct narrow, twisted takes one round before opening into vestibulae. Spermathecae bidiverticulate, stout shape diverticulum with budlike terminals with 4–5 seminal chamber, opens with common aperture in short and wide spermathecal duct, ampullae large sac-like ventrally lobulated, dorsally appears in one capsule. Penial setae two per battery, length 1.03 mm, width 0.029 mm, irregular triangular tooth-like ornamentation, slightly bent on anterior end, with blunt tip.

Variation

In paratype MNP17-1106-45A3, the porophores extended externally during preservation, concealing the vestibule, thus creating the impression of being avestibulate.

Remarks

The novel species Eutyphoeus baronongini sp. nov. is classified within the hastatus group ( Gates 1958). It has similar traits as Eutyphoeus lokchaensis sp. nov., such as the spermathecal pores positioned at b or lateral to b, bidiverticulate spermathecae, paired female pores, and holandric testes. However, it could be differentiated by the absence of pre-clitellar genital markings ( Table 1 View Table 1 ).

DNA barcode

The holotype MNP17-1105-45A2, designated process ID EW1059-17, has been assigned the BIN number BOLD: ADL1716 based on the COI barcode data. Eutyphoeus baronongini sp. nov. has a mean intraspecific divergence of 0.75 % and a maximum intraspecific divergence of 1.28%. Its nearest neighbor species is Eutyphoeus tengnoupalensis sp. nov. with a nearest neighbor distance of 10.58 ( Table 2 View Table 2 ). All specimens of the novel species share the same BIN number.