DOI: 10.5281/zenodo.15160428
title: TABLE 1 in Discovery of a novel species of the genus Perionyx Perrier, 1872 (Clitellata: Megascolecidae) from Manipur, North-Eastern Region, India

description: TABLE 1. Comparison of novel species with related species.
S. No.CharactersP. sp. nov.? 1P. daflaensis Julka 1981P. daminensis Julka 1981P. minimus Stephenson 1920P. pullus Stephenson 1920P. browantlerus Tiwari & Yadav sp. nov.P. pulvinatus Stephenson 19161Length (mm)5536–5834456225572Diameter(mm)2.71.5–3213.53.43.53Segmentsca. 9253–7156100165ca. 491264ProstomiumOpen epilobicOpen epilobicTanylobousEpilobous, ½ tongue cut off behindEpilobous ¾, the tongue being triangularOpen epilobicEpilobous, ½ tongue cut off behind5First dorsal poreiii/ivii/iiiii/iiiiv/vi/iiiv/vv/vi6ClitellumOn xii to xvi, reddish-brown annular rings, from, faintly marked intersegmental furrows, setae present.On xiii–xvi, annular, reddish, furrows faintly marked, setae present, dorsal pores occludedOn xiii–xvii, annular, reddish, setae present, intersegmental furrows indistinct, dorsal pores occluded.On xiii–xvii, of a somewhat darker colour, and the separate segments are easily distinguishable.On xi to xx, slightly swollen, less marked or absent ventrally, rather darker in colour, and dorsal pores are absent.On xiii–xvii, a yellowish-brown annular ring, intersegmental furrows lightly marked, setae present, dorsal pores present.covers xiii–½ xix, rather indefinite, and setae and dorsal pores are present.7Spermathecal poreQuadrithecal, mid-ventral in vii/viii and viii/ix.Quadrithecal, on vii/ viii–viii/ix, each pore a transverse slit in line with e or f.Quadrithecal, pores on vii and viii, just in front of 7/8 and 8/9, minute, transverse slits, in line with c.Not clearly visible, but appeared to be about a quarter of the circumference apart, in grooves vii/viii and viii/ix.Quadrithecal, in grooves vii/viii and viii/ix, close to the middle line.Quadrithecal, mid-ventral in vii/viii and viii/ix.Large in vii/viii and viii/ix, opposite the tenth setae on each side.8Female poreSingle, in front of the setal zone of xiii.Median, unpaired. minute, presetal, at the centre of a circular whitish area on xiv.Minute, unpaired, median, presetal, surrounded by a whitish circular area on xiv.Situated in a transverse groove anteriorly on segment xiv.Not visible.Single, presetal on segment xiv.Single, on xiv, between the line of the setae.9Male genital regionPaler, square to oval depression, occupies xv, xvi and xvii, the male pores on xvi, closely situated near the middle line, facing opposite to each other and on small rounded papillae.Transversely depressed on xviii. At the centre of each ovoidal thickenings, there is a pre setal tag-like whitish swelling. Male pores a minute transverse slit located in the groove just behind the posterior margin of the tag-like swelling.Male field exhibits posteriorly displaced epidermal thickening at segments xvii/xviii and xviii/xix, extending laterally to f. The seminal grooves converge slightly before meeting a bow-shaped transverse groove, with minute male pores positioned at the ends of the grooves.Male pores on prominent round papillae on segment xviii. A longitudinal depression forming a dumbbell shape due to lateral encroachment by the papillae. The pore apertures face slightly inward.Male field is positioned on segment xix and forms a mid-ventral rectangular area, broader than long. It is bordered by slight lateral grooves and deep trenches, extending into the surface of the segment. The pores are on two small whitish papillae near the mid-ventral line.Transversely elongated oval whitish depression, male pores with a transverse aperture on xviii, closely situated near the middle line, facing towards each other on small round papillae.Rectangular depression with rounded corners, on xvii–xviii–xix, with two large oval cushions. The male pores are anterior and internal to the middle point of each cushion, and in front of the setal line.10Last pair of heartxiixiixiixiixiixiixii11Intestine originxvxiv½ xivxixxviixivxv12Seminal vesicleIn xi and xii, those of xi fused together dorsally, those of xii, long, thin tubular extending up to xxv.In xi–xii, united dorsally above the gut.In xi and xii, of xi meeting each other above the gut.In ix and xii, those in xii are large and lobulated, and meet but do not fuse with each other dorsally.In xi and xii, relatively small, have a racemose appearance owing to their being composed of a number of small lobules.In xi and xii those of xi fused dorsally, a follicular mushroom-like twisted mass that meets dorsally and extends up to xix.In xi a single large lobed mass in the middle line. The second vesicle in xii, but the pair of which it is composed fuse together incompletely in xiii, and completely in xiv and xv.13ProstateLarge compact cuboidal mass in segment xvi.Lobed, in xviii–xix.Squarish, in xvii–xix.Occupy more than one segment, xviii and part of xvii on the right side, xviii and part of xix on the left; they are somewhat loosely lobulated.Small, and consist of a number of elongated finger-like lobes, the whole forming a bushy cluster.Compact cuboidal mass in segment xviii.Moderate size, in segment xviii and xix.14SpermathecaeQuadrithecal, ampulla large, the anterior border deeply indented with two or three lobules, duct short and wide, not well marked off. Diverticulum is represented by a ridge consisting of 3–4 iridescent seminal chambers, on the anterior face and the ental end of duct.Quadrithecal, ampulla pear-shaped; duct slightly shorter than ampulla narrowing towards the ectal end; diverticula represented by 3–4 iridescent sessile. seminal chambers at the ental end of duct.Spermathecal ampulla spherical; duct a little shorter than ampulla; diverticulum represented by a ridge of 3–4 iridescent seminal chambers, located at the ental end of duct.Spermathecal ampulla rounded and slightly flattened between septa, duct being the same length, narrow at its ental end between two small, subspherical diverticula, which are attached by short stalks.Spermathecal ampulla irregular in shape. The duct, starting just below the diverticula, is about as long as the ampulla and gradually narrows towards its ectal end. There are around three small, rounded, sessile seminal chambers located at the lower part of the ampulla.Quadrithecal, ampulla large elongated sac like with short and wide spermathecal duct, diverticulum absent.Quadrithecal, ampulla irregularly shaped, roughly pyramidal, with nodular surface, duct long and wide, diverticulum absent.
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description: Published as part of Tiwari, Nalini, James, Samuel W., Gupta, Neelima & Yadav, Shweta, 2025, Discovery of a novel species of the genus Perionyx Perrier, 1872 (Clitellata: Megascolecidae) from Manipur, North-Eastern Region, India, pp. 159-161 in Zootaxa 5589 (1) on page 159, DOI: 10.11646/zootaxa.5589.1.13, http://zenodo.org/record/14896853