02549nas a2200265   4500008004100000245012400041210006900165260001200234300001000246490000700256520169100263653002401954653001401978653001701992653001502009653001802024653001302042653001402055653000902069653001302078100002102091700001702112700002102129856013302150       2001                        eng d00aRestricted gene flow between two alleged subspecies of <i>Albinaria cretensis </i>(Gastropoda, Pulmonata, Clausiliidae)0 aRestricted gene flow between two alleged subspecies of iAlbinari  c2001///  a71-840 v513 aTwo morphologically similar forms of pulmonate snails of the Albinaria cretensis complex, Albinaria cretensis cf. vexans and Albinaria cretensis sphakiota, with ribbed and relatively smooth shells, respectively, occur sympatrically but with a mosaic distributional pattern in the Imbros gorge (Crete, Greece). These forms were studied conchologically and using allozyme analyses and RAPD to investigate their genetic and phylogenetic relationships. Gene flow between the two forms is minimal. Genetic similarity between morphologically similar forms collected at different places in the gorge is larger than between distinguishable forms found at the same locality. Hybrids are formed only incidentally. There are neither sharp borderlines nor hybrid zones between the two forms. In a gorge c. 10 km to the west, a relatively smooth form is found together with Albinaria cretensis tenuicostata and Albinaria sublamellosa heteroptyx, both characterized by ribbed shells. Using the same methods, it turned out that the form with smooth shells is genetically almost identical to the conchologically indistinguishable one from the Imbros gorge, and different from the local A. cretensis tenuicostata. These data support the view that A. c. sphakiota is a separate species occurring in both gorges. The fact that A. sublamellosa clusters among A. c. sphakiota, does not allow for any conclusions because the analyses were not designed for an investigation including that species. The results are in favour of the view hitherto based on shell morphology mainly, that there are many genetically more or less isolated entities, sometimes with very restricted ranges, within the genus Albinaria.10aAlbinaria cretensis10aAllozymes10aClausiliidae10aGastropoda10ahybridization10aMollusca10aPulmonata10aRAPD10ataxonomy1 aGittenberger, A.1 aVrieling, K.1 aGittenberger, E.  uhttps://icgf.myspecies.info/content/restricted-gene-flow-between-two-alleged-subspecies-albinaria-cretensis-gastropoda-pulmonata02299nas a2200337   4500008004100000245013200041210006900173300001200242490000700254520124000261653002401501653001401525653001201539653002001551653001701571653001501588653001001603653002501613653002301638653001301661653002401674653001701698653001501715653001301730653002201743653001501765653001301780653001401793100002101807856013301828       1995                        eng d00aA comparative study of hybrid zones in the polytypic land snail <i>Albinaria hippolyti </i>(Gastropoda Pulmonata: Clausiliidae)0 acomparative study of hybrid zones in the polytypic land snail iA  a261-2900 v453 aMany species of the Mediterranean land snail genus Albinaria are highly polytypic. Because patterns of subspeciation may shed light on mechanisms of speciation in this group, three hybrid zones in A. hippolyti are analyzed. One of these, between the subspecies A. h. aphrodite and A. h. harmonia, was reported on earlier and is included as a reference. The zones were investigated by sampling across then and studying these samples conchologically, anatomically and biochemically. In general terms, the analyses show that all zones are characterised by several to many coincident dines in various types of trails. At each locality, the observed cline widths are of the same order of magnitude. In only one case was a clear association with an environmental transition observed. At all localities. some indication of recombinant disadvantage was found, in the presence of 'hybrizymes', anomalies in the reproductive system, or both. The data, viewed in the light of the snails' distribution and population structure, suggest that the hybrid zones result from secondary contact and are maintained by a balance between dispersal and selection against hybrids. This result supports a model of(sub)speciation in small, isolated populations.10aalbinaria hippolyti10aAllozymes10aanatomy10abombina-bombina10aClausiliidae10aconchology10aCrete10aelectrophoretic data10afire-bellied toads10agenetics10ahybrid disadvantage10ahybrid zones10ahybrizymes10aMollusca10aNatural selection10aspeciation10avariants10avariegata1 aSchilthuizen, M.  uhttps://icgf.myspecies.info/content/comparative-study-hybrid-zones-polytypic-land-snail-albinaria-hippolyti-gastropoda-pulmonata