Changes to be committed:

modified:   .gitignore
	new file:   pkg/obitax/default_taxonomy.go
	modified:   pkg/obitax/taxon.go
	modified:   pkg/obitax/taxonnode.go
	modified:   pkg/obitax/taxonomy.go
	modified:   pkg/obitax/taxonset.go
	modified:   pkg/obitax/taxonslice.go
	modified:   pkg/obitools/obifind/iterator.go
	modified:   pkg/obitools/obifind/options.go

pkg/obitax/taxonnode.go

@@ -35,10 +35,17 @@ type TaxNode struct {
 // Returns:
 //   - A formatted string representing the TaxNode in the form "taxonomyCode:id [scientificName]".
 func (node *TaxNode) String(taxonomyCode string) string {
-	return fmt.Sprintf("%s:%v [%s]",
+	if node.HasScientificName() {
+		return fmt.Sprintf("%s:%v [%s]",
+			taxonomyCode,
+			*node.id,
+			node.ScientificName())
+	}
+
+	return fmt.Sprintf("%s:%v",
 		taxonomyCode,
-		*node.id,
-		node.ScientificName())
+		*node.id)
+
 }
 
 // Id returns the unique identifier of the TaxNode.
@@ -59,6 +66,10 @@ func (node *TaxNode) ParentId() *string {
 	return node.parent
 }
 
+func (node *TaxNode) HasScientificName() bool {
+	return node != nil && node.scientificname != nil
+}
+
 // ScientificName returns the scientific name of the TaxNode.
 // It dereferences the pointer to the scientific name string associated with the taxon node.
 //