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Gastropoda, Pulmonata, Clausiliidae) BASTERIA, 66:129-138, 2002 Two limestone ‘islands’ in central northern Greece, six new clausiliid taxa, three kinds of microarmature(Gastropoda, Pulmonata, Clausiliidae) E. Gittenberger Nationaal Natuurhistorisch Museum, PO. Box 9517, NL 2300 RA Leiden, The Netherlands; [email protected] in Two isolated limestone outcrops northern Greece were searched for terrestrial molluscs. Seven ofclausiliids taxa were recorded, six of them new to science: Montenegrina dennisi spec. M. maasseni nov., M. dennisiprotruda subspec. nov., janinensis subspec. nov., Macedonica pindi- M. bellula microar- ca spec. nov., pindica subspec. nov., Idyla castalia yeruni subspec. nov. The of the clausilium is described for of each of the three invol- mature a representative genera ved. Key words: Gastropoda, Pulmonata, Clausiliidae, Montenegrina, Macedonica, Idyla, microar- mature, Greece. INTRODUCTION Guided revealed for use Mr. W. Reenema, by geological maps, kindly malacological by who explained what might refer to calcareous areas, the author visited some isolated limestone hills in central northern Greece, Makedonia, prefecture of Grevena. During a first visit in 2000, he was accompanied by Mr. D. Uit de Weerd, who was responsible for most of the planning then. At that time the limestone cliffs W and SW ofGrevena, near Aetia and Zakas, dominating the landscape from far away, were investigated. The fol- localities lowing year, the same and some much lower limestone outcrops more to the north were visited with Mr. WJ.M. Maassen. It turned out that these limestone islands, situated in an isolating sea of other types of soil, probably had never before been inves- tigated or even visited by malacologists. This conclusion was drawn from the fact that six of the seven clausiliid taxa that were recorded turned out to be new to science. These taxa to are described here. The seventh clausiliid belongs Siciliaria Vest, 1867, and can- not be identified reliably. Solem (1972) coined the term 'microarmature' for the microscopic denticles in the ofthe shells ofterrestrial These microdenticles apertural region in various groups snails. of unknown function are clearly oriented in a particular direction; they have a frontal and lateralborders. Laterauthors hardly ever tried to exploit the microarmature in sys- tematic studies and nothing is known about it in clausiliids. While making SEM photo- of the clausilial turned that there differences graphs blades, it out are conspicuous between in the species of different genera also the ultrastructure of the clausilium. the of the Therefore, microarmature on a particular part clausilial blade is decribed in of the three call attention for species genera here, mainly to a neglected potential source of information.There may be differences between different places of the clausilium, especially in density, size, and orientation ofthe denticles. There is a microarmature on all plicae and lamellae, and in between, in the apertural region of the clausiliid shells studied, but withinthe ofthis this was not further. scope paper investigated Abbreviations: GM, E. Gittenberger & WJ.M. Maassen leg.; GU, E. Gittenberger & D. 130 BASTERIA, Vol. 66, No. 4-6, 2002 Uit de Weerd leg.; H, shell height; NO, colln H. Nordsieck, Aarbergen-Riickershausen, Germany; rkm, distance in km, measured along the road; RMNH, National Museum of The Natural History (formerly Rijksmuseum van Natuurlijke Historie), Leiden, Netherlands; SU, colln P Subai, Achen, Germany; W, shell width. SYSTEMATICS Alopiinae, Cochlodinini Genus Macedonica O. Boettger, 1877 Microarmature(figs 20-23). - In Macedonicapindica bellula subspec. nov. the microar- mature ofthe clausilial blade was studied. It consists of rather broad denticles which are not composed of smaller entities; their frontal edges have two straight sides, making an obtuse angle. Macedonica pindica spec. nov. — Shell slender with 10 'A -12 V* flattened whorls, Description. very spindle-shaped, separated by an indented suture; last whorl vaguely flattened obliquely, withoutany keels furrow. brownish because of surface or Bluish-grey or a patchy, whitish, layer covering more or less completely the brown ground-colour ofthe shell. Columellaris prominent, flaring about horizontally into the aperture. Subcolumellaris hidden behind the apertu- in ral lip, only its lower end visible, very oblique view. Palatal plicae centre dorsolateral; half with a prominent principalis, an upper palatal plica measuring about its length, a basalis of intermediatelength, and sometimes an obsolete plica suturalis. The columel- A whorl inside than the Parietalis laris reaches nearly deeper spiralis. moderately pro- its minent, about as far as own length away from the spiralis. Clausilial plate notched; broad with a narrow, long, basal lobe and a much less protruding, palatal one. — Differentiation. Macedonica macedonica (Rossmassler, 1839) is similar in shape and colour, differing most clearly by a more 'complete' clausilial apparatus with somewhat longer folds, i.e. by the frequent presence ofone or two, short, palatal plicae in between the upperpalatalis and the basalis, a more prominent plica suturalis, and a lamella parie- talis far inside the the Its clausilial blade has reaching as as spiralis approaches aperture. two lobes curved in opposite directions and separated by a narrow deep notch; the lobes are irregular in outline and reach about equally far (positioned as in fig. 20). Also in M. the clausilial blade has less but here the pindica a conspicuous, more or angled notch, inner lobe reaches much further than the broad outer which is narrow one, more gra- dually curved in front (fig. 20). Note. — The populations of the two main limestone regions in the research area are clearly differentiated, so that two subspecies can be distinguished. Macedonica pindica pindica subspec. nov. (figs 1, 2) 14 km Material (holotype and paratypes).— Macedonia,nomos Grevena: SW ofGrevena, limestone cliffs 1.5 km SE of Zakas, after 2.5 rkm along road to Spileo, N-slope, 900 m alt., UTM EK2429, GM (NO/3; RMNH 82022/30; SU/3); do., GU (RMNH 94943/holotype,94944/19). Differentiation. — Shell with rather bluish whorls, 10 54-12 % patchy, grey irregularly Gittenberger: Two limestone 'islands' 131 with that in not and sculptured growth-lines vary prominence; transparent no spiral discernible. Sometimes microsculpture with a plica suturalis. H 20.3-26.0 mm; W 5.0-5.4 mm. Derivatio nominis: the epithet pindica refers to the occurrence in the Pindos moun- tains. Macedonica bellula pindica subspec. nov. (figs 3, 4, 20-23) Material and 19 (holotype paratypes).— Macedonia, nomos Grevena: km W of Grevena, on rocks along path to Spilea toon Nymphoon, between river and mountain, 2.3 rkm before Aetia (along the road from Anavrita to UTM GM Aetia), W-slope, 1000 m alt., EK1735, (NO/2; RMNH 82015/14; SU/2); do., GU (RMNH 94946/holotype, 94945/7). Differentiation.— Clearly differentfrom M. p. pindica by the conspicuous, sharp, white, radial with the brownish riblets, contrasting more background colour; the shells are also thinnerand somewhat that fine lines discernible. Without transparent, so very spiral are a plica suturalis. With 10 '/4-11 whorls slightly smaller than the nominate subspecies: H 19.9-22.0 mm; W 4.8-5.2 mm. Derivatio nominis. — The epithet bellula refers to the attractiveness ofthe shell. Alopiinae, Montenegrinini Genus Montenegrina O. Boettger, 1877 Microarmature — (figs 16-19). In Montenegrina dennisiprotruda subspec. nov. the micro- armature of the clausilial blade was studied. It consists of broad denticles with more or less irregular, straight fronts; at large magnifications (fig. 19) they make the impression of being composed of smaller entities that are grown together, resulting in the irregula- rity of the fronts and the longitudinally grooved surface. Montenegrina janinensis maasseni subspec. nov. (figs 5, 6) 14 km of Material (holotype and paratypes).— Macedonia,nomos Grevena, SW Grevena, rocks near the Portitsa km SE of ancient bridge, 4 Zakas, 625 m alt., UTM EK2327 (NO/2; RMNH 94949/holotype, 82024/28; SU/2). 3 Description.— Shell with 9 /4-ll whorls, very slender, fusiform; the last two to three whorls about brown. whorls and equal in width, pale greyish to yellowish Upper convex in most specimens provided with irregularly spaced, coarse but not very prominent radi- al ribs, few of which be somewhat accentuated white callus. On the only may partly by a lower whorls the convexity decreases slightly and the sculpture becomes more obsolete. With sutural line. The last of the whorl a narrow, inconspicuous, whitish, quarter body has several, more or less irregular, prominent, partly whitish wrinkles, separated by inter- that broader. Outside, the between the stices are region upper palatal plica (showing through) and the suture is inflated, whereas the cervical part right below that plica is flat- tened. More the shell rounded, without keel. basally, is broadly any true There is a broad, white, strongly reflected, not clearly thickened peristome; at the parietal side this is attached to the penultimate whorl, from the position of the parietalis 132 BASTERIA, Vol. 66, No. 4-6, 2002 Macedonica 14 km SW of Figs 1-6. Alopiinae. 1, 2, pindica pindica subspec. nov., Macedonia, nomos Grevena, Grevena, limestone cliffs 1.5 km SE ofZakas, after 2.5 rkm along road to Spileo, N-slope, 900 m alt., UTM EK2429, 21.3 GU (RMNH 94943/holotype); actual height mm. 3, 4, Macedonica pindica bellula subspec. nov., Macedonia, 19 km W of rocks between river and nomos Grevena, Grevena, on along path to Spilea toon Nymphoon, mountain, from Anavrita 1000 UTM GU 2.3 rkm before Aetia (along the road to Aetia), W-slope, m alt., EK1735, (RMNH 19.8 maasseni 94946/holotype); actual height mm. 5, 6, Montenegrinajaninensis subspec. nov., Macedonia, nomos 4 km SEof 625 UTM EK2327 Grevena, 14 km SW ofGrevena, rocks near the ancient Portitsa bridge, Zakas, m alt., 16.0 J. NNM Leiden. (RMNH 94949/holotype); actual height mm. Photographsby Goud, Gittenberger: Two limestone 'islands' 133 7-10. dennisi Figs Montenegrina spec. nov. 7, 8, M.
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