Contributions to Zoology, 78 (3) - 2009Valentina Delogu; Marco Curini-Galletti: The Parotoplana jondelii species-group (Platyhelminthes: Proseriata): a microturbellarian radiation in the Mediterranean

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Genus Parotoplana Meixner, 1938

Parotoplana jondelii Delogu and Curini Galletti, 2007

(Fig. 3A)

Material examined: two whole mounts (SMNH 6666 - holotype; CZM 55) and one specimen sagittally sectioned (CZM 56) from the type locality: Santa Maria di Leuca (Lecce, Apulia, Italy), La Principessa cave, about 5 m deep in coarse sand, May 2005.

Description: The sclerotised apparatus of this recently described species (Delogu and Curini-Galletti 2007), is here re-drawn and re-described, using the terminology of the spine pairs presented above. The species has 18 spines, arranged as follows:

- Dorsal pairs: D1 : straight, needle like, thin spines, 75-79 μm long; D2 : much stouter, straight spines, 70-80 μm long.

- The girdle typically consists of 6 pairs of spines: G1 : similar in size and shape to D2 , but with blunt apices; G2 : two broad spines (62-65 μm long), stout, straight, with falcate apices and small submarginal apophyses; G3 : large straight spines, 75-83 μm long, with straight distal tips, and small subterminal apophyses; G4 -G6 : three pairs of comparatively small spines (53-55 μm long), with apices progressively longer from G4 to G6 ; G5 distinctly slender and straighter than the other pairs.

- V: similar in size to G3 but with longer, more recurved distal tips, with distinctly blunt apices and a more developed, downwards pointing, submarginal apophyses.

In whole mounts, the presence of numerous bursal spines, arranged into two blocks, could be detected. These spines are sharply triangular in shape (up to 4-5 μm long), and weakly sclerotised (Delogu and Curini-Galletti, 2008, Fig. 7B, p. 29).

Karyotype. Chromosome number: n = 6; FN = 12. All chromosomes are isobrachial; the first three pairs are metacentric and distinctly larger than the remaining pairs, at the border between meta- and submetacentric chromosomes. Full karyometrical data are available in Delogu and Curini-Galletti, 2007.

Remarks. The species is only known from the type locality, a marine cave in southern Apulia (Italy), about 5 m deep in medium-coarse sand (Delogu and Curini-Galletti, 2007)