Octodrilus hemiandrus (Cognetti, 1901)

Octolasium hemiandrum CognETTI, 1901 BoLL. MUs. TorIno, 16(383): 3.

Octolasium (Octodrilus) hemiandrum: OModEo 1956 Arc. ZooL. ITAL., 41: 177.

Octodrilus hemiandrus: ZIcsI 1981 OpUsc. ZooL. (BUdApEsT), 17–18: 163.

Octodrilus hemiander: ZIcsI 1986 OpUsc. ZooL. (BUdApEsT), 22: 108.

Octodrilus hemiandrus: MršIć 1991 Monogr. EArThw. BALkAns: 410.

Material examined. OrtoBot Roma 1 (EWITA307-15): Botanical garden of Rome, Italy, 30/10/2011, leg. Maurizio G. Paoletti. (One specimen).

Diagnosis. Small sized worms, 60–100 mm by 5–6 mm. Colour reddish on dorsum and paler on ventrum. Male pores on 15 small. Clitellum on 1/n 28, 29–37; tubercles on 1/n 28, 29–39. Nephridiopores irregularly alternate between b and above d. One pair of testes enclosed in suboesophageal testis sacs in 11. Vesicles in 10, 12 of more or less equal size. Spermathecae seven pairs, constant in 6/7–12/13.

Remarks. Externally this species is also similar to the smaller exemplars of Oc. complanatus, however, the reddish hints seen frequently on dorsum can distinguish it from complanatus . As regards the internal anatomical structure, the metandric male condition is clearly differentiating it from the congeners with similar clitellar position.