Gibbularia gibbula gibbula (Rossmaessler, 1836)

Figs 57.1-57.4, 58.1-58.4

Distribution.

The actual distribution of the genus Gibbularia is far from being completely understood. This is mainly due to the passive anthropocorous dispersion and the absence of clear data about its centre of dispersion. Only a wide range was provided, that includes eastern peninsular and northeastern Italy as far as Istria to central Dalmatia (Alzona 1971: 89; Welter-Schultes 2012: 340; Nordsieck 2013a: 3). The subspecific taxa, except for the nominotypic one, present restricted to very restricted distribution ranges, e.g., Gibbularia gibbula pelagosana from Pelagosa or Gibbularia gibbula selecta from Tremiti Islands (Alzona 1971: 89-90).

Specimens examined.

Italy, Friuli-Venezia Giulia, Muggia, Trieste, Europa Gardens. 20 m asl, 45°36'8.91"N, 13°46'0.72"E, [Lab ID G64_1, COI: MW758958, ITS2: MW757048, MW757082, MW757083; Lab ID G64_2, COI: MW758959], W. De Mattia and J. Macor leg. and det., 3 dissected spm .

External morphology of the genital organs

(Fig. 57.3). The V is slightly longer than the FO. The FDBC is slightly longer than the SDBC+BC. The BC+SDBC is club-like in shape, with a clear distinction between the SDBC and the BC. The D is much longer than the SDBC+BC and slightly thinner. The V is short but wide in diameter. The PC is ~ 2 × longer than the V. The P is cylindrical. The transition between P and EP is visible. The PR is very short and robust. The E is much shorter than the P and thin in diameter.

Internal morphology of the genital organs

(Fig. 57.4). The V, the A and the P show a smooth with a fine granulation that becomes coarser along the proximal P. The pseudopapilla is short, roundish and originates directly from the P-E transition wall. The epiphallar formula is: PP. The E shows a particular sculpturing made of extremely tiny transverse, interrupted micro-pleats.

Additional specimens examined.

Italy, Puglia, Foggia, Apricena. 75 m asl, 41°47'1.22"N, 15°26'39.92"E, [Lab ID 12167_1, COI: MW758947; Lab ID 12167_2, COI: MW758948, ITS2: MW757055, MW757056, MW757057], H. Nordsieck leg and det., 2 dissected spm .

External morphology of the genital organs

(Fig. 57.1). The V is half as long as the FO. The FDBC is 3 × longer than the SDBC+BC. The BC+SDBC is club-like in shape, with a clear distinction between the SDBC and the BC. The D is much longer than the SDBC+BC and slightly thinner. The V is moderately long but small in diameter. The PC is ~ 2 × longer than the V. The P is cylindrical. The transition between P and EP is not clearly visible. The PR is long and robust. The E is much shorter than the P and thin in diameter.

Internal morphology of the genital organs

(Fig. 57.2). The V and the A are smooth. The P presents four to five smooth longitudinal, little elevated pleats. The PP is short, roundish and originates directly from the P-E transition wall. The epiphallar formula is: ER(ELP)+PP. The weak distal ELP soon disappear revealing a smooth internal E.