diff --git a/rescript/extract_seq_segments.py b/rescript/extract_seq_segments.py
index bd19f89..5fd3a51 100644
--- a/rescript/extract_seq_segments.py
+++ b/rescript/extract_seq_segments.py
@@ -15,7 +15,8 @@ def extract_seq_segments(input_sequences: DNAFASTAFormat,
                          reference_segment_sequences: DNAFASTAFormat,
                          perc_identity: float = 0.7,
                          target_coverage: float = 0.9,
-                         min_seq_len: int = None,
+                         min_seq_len: int = 32,
+                         max_seq_len: int = 50000,
                          threads: int = 1
                          ) -> (DNAFASTAFormat, DNAFASTAFormat):
     # Note: the `--db` is actually comprised of the short amplicon
@@ -43,11 +44,11 @@ def extract_seq_segments(input_sequences: DNAFASTAFormat,
                '--id', str(perc_identity),
                '--target_cov', str(target_coverage),
                '--strand', 'plus',
+               '--minseqlength', str(min_seq_len),
+               '--maxseqlength', str(max_seq_len),
                '--threads', str(threads),
                '--qmask', 'none',
                '--qsegout', extr_f.name,
                '--notmatched', no_match_f.name]
-        if min_seq_len:
-            cmd += ['--minseqlength', '%i' % min_seq_len]
         run_command(cmd)
     return (extr_seq_segs, no_matches)
diff --git a/rescript/plugin_setup.py b/rescript/plugin_setup.py
index a4d5247..1da9ec2 100644
--- a/rescript/plugin_setup.py
+++ b/rescript/plugin_setup.py
@@ -1130,6 +1130,7 @@
                                                  inclusive_start=False,
                                                  inclusive_end=True),
                 'min_seq_len': Int % Range(1, None),
+                'max_seq_len': Int % Range(1, None),
                 },
     outputs=[('extracted_sequence_segments', FeatureData[Sequence]),
              ('unmatched_sequences', FeatureData[Sequence])],
@@ -1151,10 +1152,12 @@
                                    '\'reference-segment-sequences\' must have '
                                    'in order to extract matching segments '
                                    'from \'input-sequences\'.',
-                'min_seq_len': 'Minimum length of sequence allowed '
-                               'for searching. Any sequence less than '
-                               'this will be discarded. If not set, default '
-                               'program settings will be used.'},
+                'min_seq_len': 'Minimum length of reference sequence segment '
+                               'allowed for searching. Any sequence less than '
+                               'this will be discarded.',
+                'max_seq_len': 'Maximum length of reference sequence segment '
+                               'allowed for searching. Any sequence greater '
+                               'than this will be discarded.'},
     output_descriptions={
         'extracted_sequence_segments': 'Extracted sequence segments '
                                        'from \'input-sequences\' '
diff --git a/rescript/tests/test_extract_seq_segments.py b/rescript/tests/test_extract_seq_segments.py
index 606b4b2..1622802 100644
--- a/rescript/tests/test_extract_seq_segments.py
+++ b/rescript/tests/test_extract_seq_segments.py
@@ -134,3 +134,91 @@ def test_high_coverage_extract_seq_segments(self):
                     'GATAAAACTAAGGTTTATCAAACTAAGGATTTGGCTCAGGATTGCCCAT'),
                    'fulllen05': 'AAAATTTTGGGGCCCCAAAATTTTGGGGCCCC'}
         self.assertEqual(obs_unmat_seqs, exp_unmat_seqs)
+
+    def test_extract_seq_segments_min_max(self):
+        ext_segs, unmat_seqs,  = extract_seq_segments(
+                        input_sequences=self.seqs,
+                        reference_segment_sequences=self.segref,
+                        perc_identity=0.9,
+                        target_coverage=0.7,
+                        min_seq_len=45,
+                        max_seq_len=53)
+
+        obs_ext_segs = {seq.metadata['id']: str(seq)
+                        for seq in ext_segs.view(DNAIterator)}
+        exp_ext_segs = {
+                   'fulllen01': ('ATCTTTATGTTTAGAAAAACAAGGGTTTTAATTGAAA'
+                                 'AACTAGAAGAAAAAGG')}
+        self.assertEqual(obs_ext_segs, exp_ext_segs)
+
+        obs_unmat_seqs = {seq.metadata['id']: str(seq)
+                          for seq in unmat_seqs.view(DNAIterator)}
+        exp_unmat_seqs = {
+                   'fulllen02': (
+                    'CGCGACATAAAGACTCCTTATTTTCTTTTTCTTTATTTTATTGAAATTTCATAAACC'
+                    'TAAATTTAAAACTGAACTAAAGGATAAATATGATAAATGAGGCAAAATCTACTGAAG'
+                    'TATTATACTACAAAAAATACTGATATACTACAAAGAATACTGAGATGGATTGTATCA'
+                    'ATATCCGGACCTTATTGTATATACACAAATAATGGATATAGAAAAATAAAAAGAAAA'
+                    'AGGTCCTTTATCTTGTTCTTGATTTGTTCTGCAGAGATTTAACTACTCTAACTTTTA'
+                    'TTCATAATTTGAAGTTCCTATCGCATAAGAATCGGTGTCCCTTTGAAAGGAAAGAGA'
+                    'GGAAGAAGCCTTTTCAATATTCTTTAATTTCAAAAATACATTATCAATCATGCAAAA'
+                    'AAACTCAAACAAATAGAGAAAAGCCAGCTATCGGAGTCGAACCGATGACCATCGCAT'
+                    'TACAAATGCGATGCTCTAAAAAAAAAAGAAAAGAATCGACCGTTCGAGTATTCCAAA'
+                    'TTGCACGAGAAAAATGATTCGAAGAGAGACATATATAATAAATGTGGTATATATGCA'
+                    'TCTATATTGAATTGTGGATACAGAAATGATAGAATAATTTCTGATTAAACCAAATAT'
+                    'AGGTTTCCAATAGAGATGAAGGGGGGATAGATAAGAAAAAATAAGAGGAAACACTTT'
+                    'TATATGAATCGGTATCTAATGACTTTAACAGTTCCAGTAGAATATAAATGAAAAGGG'
+                    'GGGGAATGACGTAATAGTAATAATAAGATCTGAATTTCAAAACACAAAACAAAATAA'
+                    'AGGGGATATGGCGAAATTGGTAGACGCTACGGACTTAATTGGATTGAGCCTTGGTAT'
+                    'GGAAACTTACTAAGTGATAACTTTCAAATTCAGAGAAACCCTGGAAAAAGGGGGCAA'
+                    'TCCTGAGCCAAATCCTGTTTTTCGAAAACAAACAAAGGTTTGTAAAGACAGAAGCAG'
+                    'AATACAAAAACAAAAGGATAGGTGCAGAGACTCAATGGAAGTTGTTCTAACAATAAC'
+                    'AAATAGAGTTGACTGCGTTGCATTAGTCAAGTAAAGGAATATTTTTGTTAAAACTCC'
+                    'AGATCTAGAAAGGATAAAAAAAACTCCAGACCAGAAAAGATAAAGGAAAGTATAACC'
+                    'GTATACTCTATACATACGTATACGTACTGAAATACTATCTCAAATGATTAATGACAA'
+                    'CCGACCCGAATCTGTATTTTATTATATTTCTATGGAAAATGAAATAAAATAAATTGT'
+                    'TTTGAATCGATTCCAAGTTGCCGAAAGGATCGAATATTAATTGATCAAATCATTCAC'
+                    'CCCGTAGTCTGATAGATAACTAATTAATCGGACGAGAGTAAAGATAGAGCCCCATTC'
+                    'TACATGTCAATATTCTACATGTCAATATCGACAACAAAGAAATTTATAGTAAGAGGA'
+                    'AAATCCGTCGACTTTAGAAATCGTGAGGGTTCAAGTCCCTCTATCCCCAAAAAAGGC'
+                    'CTGCTCGGCTCCCTAATTATTTATCTTATTCTCTCTTTTCTTCTCTCTTTTCGTTAA'
+                    'CGGTTCAAAATTCGTTATCTTTCTCATTCATTCGATTCTTTCACAAATGCATCTGGG'
+                    'ATGCATTTTTTTCTTTTCACAAGTCTTGTGGTAGATATGATACACATACAAATGAAC'
+                    'TTATTTGAGTAAAACAAGGATAAAACAAGGAATCCCTTTTGGAAATTGGAATGATTA'
+                    'ACAATGATAAAACTTTCAAATACCTTTTGTTTTTTTTTAATTGACATAGACCCAAGT'
+                    'CATTTAGTGAGATGAGGAAGACGACGCGTTGGAAATGGTCGGGATAGCTCA'),
+                   'fulllen03': (
+                    'ACCATTTCCCATGCATCATCCTGGTGTAGTATTTGTGTCTATGTCAATTAAAGGGA'
+                    'CTAAAAAGTAGTAAAAAATTTAACTAGTAAGCGTAAGGATAATGATATGGACTGTG'
+                    'AATGATTCAATAATAGAGATTATTTGCCCATATATGTTTATTTGTAGAGGTATTGT'
+                    'ATCTATCGAAATTGGGATAAGATCCAAGGATTTTAGTTCGGATACATTTGTGTTGT'
+                    'GAAAGAGTGGAGTGAATGAGAAAGATAGTGAATTTTGTTTGAACTGAATCGCTGAT'
+                    'GAAAAAAAAAGGAAGATAAATATTTAGGAAGTAAAATTACCTTTTTATTGGGGATA'
+                    'GAGGGACTTGAACCCTCACGATTTCTAAAGTCGACGGATTTTCCTCTTACTATAAA'
+                    'TTTCATTGTTGTCGGTATTGACATGTAGAATGGGACTCTCTCTTTATTCTCGTCCG'
+                    'ATTAATCAGTTTTTCAAAAGATCTATCAAACTCTGGAATGAATGATTTAATAATTG'
+                    'AATTGAATATTCAATTCTTCTTTCAACTTCCATTGGACTGGATTCACAATAACTCT'
+                    'AATTCTGAATTTTTCATATTTTAATTATCCATATAATATAATGGATTCGAGTCATG'
+                    'ATTAATCGTTTGATTTGATATGTCAGTATGTATACGTATTTATTAGGTATATAGGA'
+                    'ACATCTTTTCTGTAATTTTGATAGACGGATTCCAACTACCAACGAAACGTAGTCAA'
+                    'CTTCATTCGTTAGAACAGCTTCCATTGAGTCTCTGCACCTATCCGAATTCTAGTTT'
+                    'GATAAAACTAAGGTTTATCAAACTAAGGATTTGGCTCAGGATTGCCCAT'),
+                   'fulllen04': (
+                    'ACCATTTCCCATGCATCATCCTGGTGTAGTGTTTGTGTCTATGTCAATTAAAGGGA'
+                    'CTAAAAAGTAGTAAAAAATTTAACTAGTAAGCGTAAGGATAATGATATGGACTGTG'
+                    'AATGATTCAATAATAGAGATTATTTTCCCATATATGCTTATTTGTAGAGGTATTGT'
+                    'ATCTATCGAAATTGGGATAAGATCCAAGGATTTTAGTTCGGATACATTTGTGTTGT'
+                    'GAAAGAGTGGAGTGAATGAGAAAGATAGTGAATTTTGTTTGAACTGAATCGCTGAT'
+                    'GAAAAAAAAAGGAGGATAAATATTTAGGAAGTAAAATTACCTTTTTATTGGGGATA'
+                    'GAGGGACTTGAACCCTCACGATTTCTAAAGTCGACGGATTTTCCTCTTACTATAAA'
+                    'TTTCATTGTTGTCGGTATTGACATGTAGAATGGGACTCTCTCTTTATTCTCGTCCG'
+                    'ATTAATCAGTTTTTCAAAAGATCTATCAAACTCTGGAATGAATGATTTAATAATTG'
+                    'AATTGAATATTCAATTCTTCTTTCAACTTCCATTGGACTGGATTCACAATAACTCT'
+                    'AATTCTGAATTTTTCATATTATAATTATCCATATAATATAATGGATTCGAGTCATG'
+                    'ATTAATCGTTTGATTTGATATGTCAGTATGTATACGTATGTATTAGGTATATAGGA'
+                    'ACATCTTTTCTGTAATTTTGATAGACGGATTCCAACTACCAACGAAACGTAGTCAA'
+                    'CTTCATTCGTTAGAACAGCTTCCATTGAGTCTCTGCACCTATCCTTATTCTAGTTT'
+                    'GATAAAACTAAGGTTTATCAAACTAAGGATTTGGCTCAGGATTGCCCAT'),
+                   'fulllen05': (
+                    'AAAATTTTGGGGCCCCAAAATTTTGGGGCCCC')}
+        self.assertEqual(obs_unmat_seqs, exp_unmat_seqs)