Octodrilus complanatus (Dugès, 1828)

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 : 46-47

Octodrilus complanatus (Dugès, 1828)

( Figure 4E )

Lumbricus complanatus DUgès, 1828 Ann. ScI. NAT. PArIs, 15: 289.

Octolasium complanatum : MIchAELsEn 1900 TIErrEIch, 10: 508.

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

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

Octodrilus complanatus: MršIć 1991 Monogr. EArThw. BALkAns: 398.

Material examined. Euganei 142: Vò Euganeo, Padova, Italy, 12/10/2014, leg. Federico Gavinelli . Roncavezzai 16: Roncavezzai , Follina, Treviso, Italy, 23/10/2014, leg. Maurizio G . Paoletti. Villadose 2: collected at Villadose, Rovigo, Italy, 12/10/2014, leg. Maurizio G . Paoletti. Brioni 1 ( EWITA195-15 ): Brijuni Island, Pula, Croatia, 30/ 11/2014 , leg. Enzo Moretto. SanZeno 3 ( EWITA335-15 ): San Zeno di Colognola ai Colli, Verona, Italy, 22/10/ 2014 , leg. Maurizio G. Paoletti. Zlepcari 7–8: Zlepcari, Pican, Croatia on 15/05/2016, leg. Maurizio G. Paoletti . Ospo 3 ( EWITA347-15 ): Ospo river at Muggia, Trieste, Italy, 06/02/2015, leg. Maurizio G . Paoletti. Velebit 1 ( EWITA269-15 ): Trnovac-Velebit, Croatia on 05/09/2014, leg. Angelo L. Dreon. (Altogether nine specimens).

Diagnosis. Medium sized worms, 100–200 mm by 10–12 mm. Colour dark grey on dorsum and paler on ventrum. Male pores on 15 small. Clitellum on 1/n 28, 29–37, 38; tubercles on 1/n 28, 29, 30 – 39, 40. Nephridiopores irregularly alternate between b and above d. Two pairs of testes enclosed in suboesophageal testis sacs in 10, 11. Vesicles in 9–12 of more or less equal size. Spermathecae seven pairs, constant in 6/7–12/13.

Remarks. Oc. complanatus is morphologically similar to Oc. pseudocomplanatus however, pseudocomplanatus is a more slender worm and its nephridiopores are aligned constantly in the setal line b. Another useful character for distinguishing externally the two species is the dd setal distance relative to cd; it is 3– 5 in pseudocomplanatus and 7–10 in complanatus . The two species differ also in the form of testis sacs; they are suboesophageal in complanatus but perioesophageal in pseudocomplanatus . However, the testis sacs are developed only in completely adult specimens, therefore they can be misleading in subadult exemplars. Another useful character for alive identification is the colour; Oc. complanatus has more or less intensive grey colour while Oc. pseudocomplanatus possesses always more or less intense reddish, reddish-grey colour.

Figures

FIGURE 4. LArgE Octodrilus spEcIEs And ITs cAsTs. A. Oc. tergestinus froM MonTonA, CroATIA, B. CAsT prodUcTIon of Oc. tergestinus. C. Oc. mimus froM CoLLIo, FrIULI VEnEzIA GIULIA, ITALy, D. TowEr-shApEd cAsT of Oc. mimus. E. GALLEry of Oc. complanatus froM MonTEforchE-SorAnzo vInEyArd In EUgAnEAn hILLs, VEnETo, PAdovA, ITALy. ScALE bArs = 20 MM.