EDIT

function create_specimen_array(array $specimenOrObservations){

    $items_specimen = array();

    $items = array();

    //we need one more item to contain the items of one level (fieldunit, derivate data etc.)

    foreach ($specimenOrObservations as &$specimenOrObservation) {

        $items['data'] = $specimenOrObservation->listLabel;

            'titleCache',

            'listLabel',

            'protectedTitleCache',

            'class',

            'uuid',

            'collectionDTO'

                            'galleryLinkUri' => NULL,

                        ));

                         break;

                    case 'sources':

                            $min_max_markup = min_max_measure($value, 'absoluteElevation');

                            @_description_list_group_add($groups, cdm_occurrence_field_name_label('absoluteElevation'), $min_max_markup);

                        }

                            $min_max_markup = min_max_measure($value, 'distanceToGround');

                            @_description_list_group_add($groups, cdm_occurrence_field_name_label('distanceToGround'), $min_max_markup);

                        }

                            $min_max_markup = min_max_measure($value, 'distanceToWaterSurface');

                            @_description_list_group_add($groups, cdm_occurrence_field_name_label('distanceToWaterSurface'), $min_max_markup);

                        }

            '#attributes' => array('class' => html_class_attribute_ref($specimenOrObservation)),

        );

        $output = drupal_render($occurrence_elements);