Glyphidrilus stuhlmanni Michaelsen, 1897

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 : 11-12

5. Glyphidrilus stuhlmanni Michaelsen, 1897 Fig. 7 Table 1

Glyphidrilus stuhlmanni Michaelsen, 1897: 62. Type locality: Dunda on the Kingani, Tanzania. Michaelsen 1900: 461, 1918: 346. Jamieson 1968: 393. Brinkhurst and Jamieson 1971: 765, fig. 15.4G - H. Zicsi 1996: 20.

Material examined.

The specimen which closely matches the measurements and anatomical characters of the original description is designated herein as the lectotype ZMH V4512 ( Fig. 7 ). The type locality of this species is Dunda on the Kingani, Tanzania. Paralectotype: ZMH V4512.1 (only one tail) from the type locality. Additional reference specimens: 1 subadult (ZMH OI13904) from Tanzania, Turiani River Diwale, sugar factory. 3 adults (ZMH OI13902) from Tanzania, Morogoro floodplain. 1 adult (ZMH OI13903) from Tanzania, Turiani floodplain, sugar factory. 1 adult (ZMH OI13937) from Tanzania, Morogoro, sugar factory surrounding area.

Lectotype designation proposed herewith is necessary to ensure the species is based on a complete adult earthworm.

Description of Lectotype.

Dimensions: body length190 mm. Body cylindrical in anterior part, quadrangular in transverse section-behind clitellum. 540 segments. Anus dorso-terminal. Body colour pale brown. At posterior end dorsal surface considerably broader than the ventral. Clitellar wi on ventro-lateral part of clitellum in 43-65. Prostomium zygolobous. Dorsal pores absent. Clitellum annular in 30-68. 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. Median unpaired gm on aa in 44-50.

Septa 5/6-7/8 thicker, 8/9-11/12 thick and 12/13 to the last segment thin. Gi small, globular within 8. Intestine enlarged from 14. Dorsal blood vessel anterior to 8. He in 8-13. Np distinguishable from segment 15 onwards. Sv in 9-12, those of segment 12 are larger than the others. Ov in 13-14. Testis in 10-11. Prostate and accessory glands absent. Sc in 13/14-20/21, one to four on each side per segment.

Variation.

Additional specimens (5 complete adults) have the clitellum in 22, 23, 30-60, 66, 67, 68. Wi in 42, 43-65, 66, 67; gm laterally paired or asymmetrical on bc in 16 or 18-23, 24, 25, 26 or 27, and median unpaired or single on aa in 44/45-50/51, 64/65-67/68; sc sessile, subspherical in 9/10, 10/11, 12/13, 13/14-18/19, 20/21, 21/22.

Remarks.

See Table 1 .

This species occurs on at least three rivers in Tanzania, the Kigani near Dunda, the Turiani near Diwale, and the Morogoro.

Figures

Figure 7. Morphology of the lectotype (ZMH V 4512) of Glyphidrilus stuhlmanni Michaelsen, 1897, showing the A external ventral and B internal dorsal views.