Octodrilus hemiandrus (Cognetti, 1901)

Csuzdi, Csaba, Szederjesi, Tímea, Marchán, Daniel Fernández, Sosa, Irene De, Gavinelli, Federico, Dorigo, Luca, Pamio, Alberto, Dreon, Angelo Leandro, Fusaro, Silvia, Moretto, Enzo & Paoletti, Maurizio Guido, 2018, DNA barcoding of the Italian anecic Octodrilus species in rural (vineyard) and forested areas with description of Octodrilus zicsiniello sp. nov. (Clitellata, Megadrili), Zootaxa 4496 (1), pp. 43-64 : 47

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.