Glyphidrilus horsti Stephenson, 1930

Shen, Huei-Ping & Yeo, Darren C. J., 2005, Terrestrial Earthworms (Oligochaeta) From Singapore, Raffles Bulletin of Zoology 53 (1), pp. 13-33 : 18

publication ID	https://doi.org/ 10.5281/zenodo.13244835
DOI	https://doi.org/10.5281/zenodo.13245058
persistent identifier	https://treatment.plazi.org/id/0D51326D-B672-FFE9-9BD5-FE1344F693DF
treatment provided by	Felipe
scientific name	Glyphidrilus horsti Stephenson, 1930
status

Treatment

Glyphidrilus horsti Stephenson, 1930 View in CoL

( Fig. 2 View Fig )

Glyphidrilus horsti Stephenson, 1930: 4 View in CoL ; 1931: 262.

Material examined. – 1 mature (clitellate) specimen (amputated and half-broken between segment 46/47, dissected) and 2 not fully matured specimens (1 amputated)( ZRC), Turut Track, Kranji Wireless Station , coll. K. K. P. Lim, D. C. J. Yeo & K. L. Yeo, 7 Mar.2003 .

Description. – Length for amputated, dissected specimen 47.7 mm, and for the other two specimens 34.9 mm (amputated) and 53.3 mm. Wing width 2.1-3.3 mm. Segments numbering 125-232. Prostomium zygolobous. Dorsal pores absent. Clitellum from XVIII, 1/2XVIII or XIX to XXIX, XXX or 1/2 XXXI. Wings lateral to b, XXIII-XXVIII. Setae paired, preclitellum: aa = 2.6ab, bc = 2.5cd, aa = 0.78dd; postclitellum: aa = 3.2ab, bc = 2.2cd, aa = dd. Genital papillae present only for the dissected specimen, postsetal, lateral to or in line with b, asymmetrical on XVIII and XIX, paired on XXII and XXIX. No median papillae ( Fig. 2 View Fig ). Each papilla small, round, vague, about 0.2 mm in diameter. Male pores, female pores, and spermathecal pores not visible. Preserved specimens pale grey.

Gizzard in VIII. Intestine enlarged from XV. Hearts VIII-XI. Nephridia holoic. Seminal vesicles in IX-XII, small, vestigial, last pair larger. Prostate and accessory glands absent. Spermathecae sessile, globular, transparent, underdeveloped, about 0.3 mm in diameter, two on each side per segment in XIV-XVII.

Remarks. – Glyphidrilus horsti from Pulau Berhala has clitellum in XVII-XXVIII, wings in 1/2XXIII-XXVII and the presence of median papillae ( Stephenson, 1930). The specimens collected from Singapore in this study were slightly different from the original description by the positions of clitellum and wings one or two segments behind, and absence of median papilla. The differences might be considered as individual or geographical variation.