Glyphidrilus jacobsoni Michaelsen, 1922

Chanabun, Ratmanee, Sutcharit, Chirasak, Tongkerd, Piyoros & Panha, Somsak, 2013, The semi-aquatic freshwater earthworms of the genus Glyphidrilus Horst, 1889 from Thailand (Oligochaeta, Almidae) with re-descriptions of several species, ZooKeys 265, pp. 1-76 : 18-20

10. Glyphidrilus jacobsoni Michaelsen, 1922 Fig. 12 Table 1

Glyphidrilus jacobsoni Michaelsen, 1922: 10. Type locality: Sumatra, Korintji, Soengai Koembang. Jamieson 1968: 393. Brinkhurst and Jamieson 1971: 760, fig. 15.3I-J.

Material examined.

The specimen which closely matches the measurements and anatomical characters with the original description is designated herein as the lectotype ZMH V9293 ( Fig. 12 ). The type locality of this species is Sumatra, Korintji, Soengai Koembang. Paralectotype: ZMH V9293.1 (1 juvenile) same locality with lectotype.

Description of Lectotype.

Dimensions: body length 101+ mm. Body cylindrical in anterior part, quadrangular in transverse section behind clitellum. 135+ segments. Body colour pale brown. At posterior end dorsal surface considerably broader than the ventral. Clitellar wi on ventro-lateral part of clitellum in 21- ¾27. Prostomium zygolobous. Dorsal pores absent. Clitellum annular in 18-31. Four pairs of setae per segment from 2, setal formula aa:ab:bc:cd:dd = 1.0:0.5:1.5:0.5:1.0 in segment 8. Female pores, male pores and spermathecal pores not visible. Gm: lateral paired or asymmetrical on bc in 18-20, median unpaired on aa in 13-14.

Septa 5/6-8/9 thicker, 9/10-11/12 thick and 12/13 to the last segment thin. Gi small, globular within 8. Intestine enlarged from 15. Dorsal blood vessel anterior to 8. He in 8-11. No distinguishable np in first eleven segments. Sv in 9-12, with the pair in segment 12 larger than the others. Ov in 13-14. Testis in 10-11. Prostate and accessory glands absent. Sc in 12/13-16/17, four on each side per segment.

Remarks.

See Table 1 .

This speciesis known only from the type locality in Sumatra, Korintji, Soengai Koenbang.

Figures

Figure 12. Morphology of the lectotype (ZMH V 9293) of Glyphidrilus jacobsoni Michaelsen, 1922, showing the A external ventral and B internal dorsal views.