Helodrilus patriarchalis (Rosa, 1893)

Description - External - Body length 30 -150 mm, diameter 2-4 mm, 100 -200 segments. Pigment lacking. Head epilobous, first dorsal pore in 4/5. Glandular tumescence usually on 30-33 ab. Setae closely paired. Clitellum extends on segments (21), 22, 23 -33, 34 saddle-shaped. Tubercles usually on 1/2 30 - 1/2 33.  Male pore on 15, great slit between setae b-c, surrounded with a glandular crescent, frequently protruding into the neighboring segments.

Internal -  Two pairs of testes free in 10 , 11, and two pairs of seminal vesicles in 11, 12. Spermathecae two pairs in 9/10 , 10 /11 open in setal line cd. Calciferous glands in 10 -12 with lateral pouches in 10 . Crop in 15-16, gizzards in 17-18. Excretory system holonephridial, nephridial bladders lacking. Longitudinal muscle layer is of fasciculated type.