EDIT

    @Override

    public List<PreservedSpecimenDTO> findByTitlePreservedSpecimenDTO(FindOccurrencesConfigurator config) {

        Taxon taxon = null;

        if(config.getAssociatedTaxonUuid()!=null){

            TaxonBase<?> taxonBase = taxonService.load(config.getAssociatedTaxonUuid());

            if(taxonBase.isInstanceOf(Taxon.class)){

                taxon = CdmBase.deproxy(taxonBase, Taxon.class);

            }

        }

        TaxonName taxonName = null;

        if(config.getAssociatedTaxonNameUuid()!=null){

            taxonName = nameService.load(config.getAssociatedTaxonNameUuid());

        }

        List<DerivedUnit> occurrences = new ArrayList<>();

        occurrences.addAll(dao.findOccurrences(DerivedUnit.class,

                config.getTitleSearchString(), config.getSignificantIdentifier(),

                config.getSpecimenType(), taxon, taxonName, config.getMatchMode(), null, null,

                config.getOrderHints(), null));

        List<PreservedSpecimenDTO> dtos = new ArrayList<>();

        occurrences.forEach(derivedUnit->dtos.add(assemblePreservedSpecimenDTO(derivedUnit)));

        return dtos;

    }