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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Parotoplana axi sp. n.

(Figs 3B; 4A)


Fig. 4. Male sclerotised apparatus of Parotoplana axi (A) (holotype); P. carthagoensis (B) (holotype); P. gracilispina (C) (holotype); P. crassispina (holotype, from Castiglione della Pescaia (D); from Le Bombarde (E); from Canet (G)); P. ichnusae (G) (holotype); P. obtusispina (H) (holotype); P. pulchrispina (I)(holotype). Scale bars: 10 µm.

Holotype: one karyological slide made permanent with lactophenol (SMNH 7573).

Type locality: Catania, Agnone (Sicily, Italy) (lat. 37°18’38.03”N, long. 15°6’24.63”E); lower intertidal, medium-coarse sand, October 2008.

Etymology: the species is dedicated to dr. prof. Peter Ax (Göttingen, Germany), for his long-lasting contribution to the study of the Otoplanidae.

Description: Sclerotised apparatus consisting of 16 spines:

- D1 -D2 : dorsal spines are similar: both pairs are slender, 50-52 µm long, tapering into an acute, outwardly curved point, particularly evident in D2 . As in all the species of the group, D1 is thinner (maximum width: 1,5 µm) than D2 (max. width: about 3 µm).

- G1 -G5 : the girdle consists of five pairs of slender spines, with maximum width of stem about 2 µm, and length ranging from 39 to 46 µm. All have falcate distal tips, conical at least in G4 and G5 , and small, triangular apophyses.

- V: distinctive spines, about 49-51 µm um long, provided with an apex 17-21 µm long, tapering into a narrowly elongate distal tip, and a small (1.5 µm long) apophysis. Stem about 4 µm broad at its basis, narrowing to 1.5 µm just below the apophysis.