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FIGURE 6 in Additional morphological information on Dipteropeltis hirundo Calman, 1912, and a description of Dipteropeltis campanaformis n. sp. (Crustacea: Branchiura) from two characiform benthopelagic fish hosts from two Northern rivers of the Brazilian Amazon

FIGURE 6. Micrographs of an egg bearing female Dipteropeltis campanaformis n. sp. (Paratype, INPA 423i). Scanning electron micrographs. (A) Antennule and antenna. a = antenna, ant = antennule. (B) Triangular oval anterior respiratory area located on the ventral surface of the carapace. ar = anterior respiratory area. Dashed line drawn slightly outside of the structure, indicates the outline of the respiratory area. (C) Ovoid posterior respiratory area located on the ventral surface of the carapace. pr = posterior respiratory area. Dashed line drawn slightly outside of the structure, indicates the outline of the respiratory area. (D) Section of the membrane of the maxillule. z1 = zone 1, z2 = zone 2, z3 = zone 3. (E) Sucker zone 1 (z1) consisting of lineated rows of micro papillae. (F) Sucker zone 2 (z2) consisting of suctorial plates. (G) Sucker zone 3 (z3) consisting of a single ovoid, elongated discoidal scale. (H) Mouth. labi = labium, labr = labrum, lp = lateral protrusion, ls = labial spines, m = mandible. (I) Upper lip bearing the setules. labr = labrum, m = mandible, s = setules. (J) Left lateral protrusion of the upper lip bearing the left mandible. lp = lateral protrusion, m = mandible. (K) Tubular labial spines. ls = labial spines. (L) Setae of the internal dorsal surface of the mouth. (M) Light micrograph of the diminutive preoral structure. Dashed line drawn slightly outside of the structure, indicates the outline of the preoral structure, mx = maxillules, ps = preoral structure. Scanning electron micrographs. (N) Pectinate scales of the protrusion on the third segment of the maxillae. (O) Flattened spermathecal spine area sparsely scattered with coarse pectinate scales interspersed with setules. arrows = setules, ss = spermathecal spines, # = course pectinate scales. Scale bars: A, B, 100 µm; C, 500 µm; D, O, 20 µm; E, J, K, M, 10 µm; F, G, I, 5 µm; H, N, 50 µm; L, 2 µm.

FIGURE 4. Dipteropeltis campanaformis n in Additional morphological information on Dipteropeltis hirundo Calman, 1912, and a description of Dipteropeltis campanaformis n. sp. (Crustacea: Branchiura) from two characiform benthopelagic fish hosts from two Northern rivers of the Brazilian Amazon

FIGURE 4. Dipteropeltis campanaformis n. sp. Paratype female INPA 423i. (A) Dorsal view. ce = compound eye, ir = interocular rods, ne = nauplius eye. (B) Ventral view. ar = anterior respiratory area, ma = maxilla, mo = mouth, mx = maxillule, pr = posterior respiratory area, sp = spermatheca, Scale bars: A, B, 2 mm.

FIGURE 5. Dipteropeltis campanaformis n in Additional morphological information on Dipteropeltis hirundo Calman, 1912, and a description of Dipteropeltis campanaformis n. sp. (Crustacea: Branchiura) from two characiform benthopelagic fish hosts from two Northern rivers of the Brazilian Amazon

FIGURE 5. Dipteropeltis campanaformis n. sp. Paratype female INPA 423i. (A) The left antenna and antennule. a = antenna, ant = antennule. (B) The right maxillae. 1 = first segment, 2 = second segment, 3 = third segment, 4 = fourth segment, 5 = fifth segment, 6 = sixth segment. (C) The sixth segment of the right maxillae bearing 2 claws. (D) The first left leg. (E) The second left leg. (F) The third left leg. (G) The fourth left leg showing the natatory lobe. bp = basopodite, cx = coxa, en = endopodite, ex = exopodite, pc = precoxa, nl = natatory lobe. Scale bars: A, 20 µm; B, 200 µm; C, 10 µm; D–F, 500 µm; G, 200 µm.

FIGURE 3 in Additional morphological information on Dipteropeltis hirundo Calman, 1912, and a description of Dipteropeltis campanaformis n. sp. (Crustacea: Branchiura) from two characiform benthopelagic fish hosts from two Northern rivers of the Brazilian Amazon

FIGURE 3. Light micrographs of Dipteropeltis sp. (A) Dipteropeltis hirundo (Paratype, BMNH 1892.10.24.2). (B) Dipteropeltis campanaformis n. sp. (Holotype INPA 1934). Scale bars: A, B, 5 mm.

FIGURE 2 in Additional morphological information on Dipteropeltis hirundo Calman, 1912, and a description of Dipteropeltis campanaformis n. sp. (Crustacea: Branchiura) from two characiform benthopelagic fish hosts from two Northern rivers of the Brazilian Amazon

FIGURE 2. Scanning electron micrographs of an egg bearing female Dipteropeltis hirundo (Paratype INPA 430i). (A) Ovoid respiratory area located on the ventral surface of the carapace. Dashed line drawn slightly outside of the structure, indicates the outline of the respiratory area. (B) Maxillule zone 1 (z1) consisting of folds in an erratic pattern. (C) Maxillule zone 2 (z2) round sclerites. (D) Sclerite of zone 2 with finite setules arranged on the surface. Scale bars: A, 500 µm; B, 10 µm; C, 20 µm; D, 5 µm.

FIGURE 1. Dipteropeltis hirundo. Paratype female BMNH 1892.10. 24. 2 in Additional morphological information on Dipteropeltis hirundo Calman, 1912, and a description of Dipteropeltis campanaformis n. sp. (Crustacea: Branchiura) from two characiform benthopelagic fish hosts from two Northern rivers of the Brazilian Amazon

FIGURE 1. Dipteropeltis hirundo. Paratype female BMNH 1892.10. 24. 2. (A) Dorsal view. AL = abdomen length, ASL = abdomen split length, ce = compound eye, CSL = carapace split length, ir = inter-ocular rods, ne = nauplius eye. (B) Ventral view. fr = furcal rami, HC = head to carapace lobe end, ma = maxilla, mo = mouth, mx = maxillule, SD = sucker diameter, sp = spermatheca. (C) The right maxillae. 1 = first segment, 2 = second segment, 3 = third segment, 4 = fourth segment, 5 = fifth segment, 6 = sixth segment. (D) The fourth left leg showing the natatory lobe. bp = basopodite, cx = coxa, en = endopodite, ex = exopodite, pc = precoxa, nl = natatory lobe. Scale bars: A, B, 2 mm; C, 400 µm; D, 200 µm.

TABLE 1. Host species and morphological measurements for the 13 in A new species of the fish louse genus Dipteropeltis Calman, 1912 (Crustacea: Branchiura) from Peru

TABLE 1. Host species and morphological measurements for the 13 specimens collected. Groups correspond to Dipteropeltis longicaudatus sp. nov. adults (I) and juveniles (II), as well as Dipteropeltis hirundo (III). Specimen I.2 is the holotype (MUSM 5128). Specimen II.1 was found on host Brycon amazonicus; no measurements were taken before its loss. Gravid specimens denoted with asterisk (*). Measurements and ratios are based on Neethling et al. 2014: abdomen length (AL), abdomen split length (ASL), carapace split length (CSL), distance from head to abdominal lobe end (HA), distance from head to carapace lobe end (HC), and sucker diameter (SD). Units are in millimeters (mm).<table><tbody><tr><th>Specimen ID</th><th>Host species</th><th>AL</th><th>ASL</th><th>CSL</th><th>HA</th><th>HC</th><th>SD</th><th>HC/HA</th><th>HA/HC</th><th>CSL/HC</th><th>ASL/AL</th><th>AL/HA</th><th>AL/HC</th><th>SD/HA</th><th>SD/HC</th></tr></tbody><tbody><tr><th>I.1*</th><td>Triportheus albus</td><td>11.3</td><td>10.4</td><td>6.3</td><td>19.0</td><td>9.5</td><td>1.0</td><td>0.50</td><td>2.00</td><td>0.66</td><td>0.92</td><td>0.59</td><td>1.19</td><td>0.05</td><td>0.11</td></tr><tr><th>I.2*</th><td>Triportheus albus</td><td>11.0</td><td>9.5</td><td>7.0</td><td>17.5</td><td>10.0</td><td>1.0</td><td>0.57</td><td>1.75</td><td>0.70</td><td>0.86</td><td>0.63</td><td>1.10</td><td>0.06</td><td>0.10</td></tr><tr><th>I.3</th><td>Brycon amazonicus</td><td>8.0</td><td>7.0</td><td>6.5</td><td>14.0</td><td>8.5</td><td>1.0</td><td>0.61</td><td>1.65</td><td>0.76</td><td>0.88</td><td>0.57</td><td>0.94</td><td>0.07</td><td>0.12</td></tr><tr><th>I.4*</th><td>Triportheus albus</td><td>22.0</td><td>20.5</td><td>12.5</td><td>31.5</td><td>16.0</td><td>1.0</td><td>0.51</td><td>1.97</td><td>0.78</td><td>0.93</td><td>0.70</td><td>1.38</td><td>0.03</td><td>0.06</td></tr><tr><th>I.5</th><td>Brycon amazonicus</td><td>12.5</td><td>10.5</td><td>5.5</td><td>19.5</td><td>7.5</td><td>0.8</td><td>0.38</td><td>2.60</td><td>0.73</td><td>0.84</td><td>0.64</td><td>1.67</td><td>0.04</td><td>0.10</td></tr><tr><th>I.6</th><td>Brycon amazonicus</td><td>7.0</td><td>6.5</td><td>5.0</td><td>11.0</td><td>7.5</td><td>0.8</td><td>0.68</td><td>1.47</td><td>0.67</td><td>0.93</td><td>0.64</td><td>0.93</td><td>0.07</td><td>0.10</td></tr><tr><th>I.7</th><td>Triportheus albus</td><td>7.0</td><td>5.5</td><td>5.0</td><td>13.0</td><td>7.5</td><td>0.8</td><td>0.58</td><td>1.73</td><td>0.67</td><td>0.79</td><td>0.54</td><td>0.93</td><td>0.06</td><td>0.10</td></tr><tr><th>II.2</th><td>Brycon amazonicus</td><td>1.5</td><td>1.3</td><td>1.5</td><td>4.5</td><td>3.0</td><td>0.5</td><td>0.67</td><td>1.50</td><td>0.50</td><td>0.83</td><td>0.33</td><td>0.50</td><td>0.11</td><td>0.17</td></tr><tr><th>II.3</th><td>Brycon amazonicus</td><td>1.5</td><td>1.0</td><td>2.0</td><td>5.0</td><td>3.5</td><td>0.5</td><td>0.70</td><td>1.43</td><td>0.57</td><td>0.67</td><td>0.30</td><td>0.43</td><td>0.10</td><td>0.14</td></tr><tr><th>II.4</th><td>Brycon amazonicus</td><td>0.8</td><td>0.5</td><td>0.8</td><td>3.0</td><td>2.0</td><td>0.3</td><td>0.67</td><td>1.50</td><td>0.38</td><td>0.67</td><td>0.25</td><td>0.38</td><td>0.08</td><td>0.13</td></tr><tr><th>II.5</th><td>Brycon amazonicus</td><td>1.3</td><td>1.0</td><td>2.0</td><td>4.5</td><td>3.3</td><td>0.5</td><td>0.72</td><td>1.38</td><td>0.62</td><td>0.80</td><td>0.28</td><td>0.38</td><td>0.11</td><td>0.15</td></tr><tr><th>II.6</th><td>Triportheus albus</td><td>1.0</td><td>0.8</td><td>1.0</td><td>3.5</td><td>2.5</td><td>0.5</td><td>0.71</td><td>1.40</td><td>0.40</td><td>0.75</td><td>0.29</td><td>0.40</td><td>0.14</td><td>0.20</td></tr><tr><th>III.1*</th><td>Brycon amazonicus</td><td>4.7</td><td>4.0</td><td>11.0</td><td>13.5</td><td>14.7</td><td>0.75</td><td>1.09</td><td>0.92</td><td>0.75</td><td>0.85</td><td>0.35</td><td>0.32</td><td>0.05</td><td>0.05</td></tr></tbody></table>

FIGURE 3 in A new species of the fish louse genus Dipteropeltis Calman, 1912 (Crustacea: Branchiura) from Peru

FIGURE 3. Dipteropeltis longicaudatus sp. nov. adult specimens. (A) Specimen I.4 attached to host Triportheus albus, dorsal view. (B) Specimen I.2 (holotype MUSM 5128) preserved in 70% isopropyl alcohol, ventral view (missing right maxillule). (C) Specimen I.4, dorsal view of head and carapace. All scale bars = 5 mm.

FIGURE 4 in A new species of the fish louse genus Dipteropeltis Calman, 1912 (Crustacea: Branchiura) from Peru

FIGURE 4. Dipteropeltis longicaudatus sp. nov. adult specimens I.7 (A–D, F) and I.4 (E), scanning electron micrographs. (A) Ventral view. (B) Sucker rim showing zones (z1–3). (C) Mouth. (D) Spacing shown between legs and partial outline of posterior carapace field. (E) Partial abdomen field, fourth pair of legs, and spermathecae. (F) Spermathecal spines. Abbreviations: af = abdomen field, labi = labium, labr = labrum, lp = lateral protrusion, ls = labial spines, m = mandible, ma = maxilla, mo = mouth, mx = maxillule, nl = natatory lobe, pcf = posterior carapace field, pos = pre-oral spine, sp = spermatheca, ss = spermathecal spines. Dashed lines represent border of thin integument of pcf (D) and af (E). Scale bars: A = 300 µm, B = 30 µm, C = 20 µm, D = 150 µm, E = 300 µm, F = 20 µm.

FIGURE 6 in A new species of the fish louse genus Dipteropeltis Calman, 1912 (Crustacea: Branchiura) from Peru

FIGURE 6. Dipteropeltis longicaudatus sp. nov., juvenile paratype (MUSM 5130, specimen II.5). (A) Dorsal view. (B) Ventral view. Abbreviations: acf = anterior carapace field, af = abdomen field, ant = antenna, antl = antennule, ce = compound eye, ir = interocular rod, ma = maxilla, mo = mouth, mx = maxillule, ne = nauplius eye, pcf = posterior carapace field, pos = pre-oral spine, sp = spermatheca. Scale bars = 1 mm.

FIGURE 2 in A new species of the fish louse genus Dipteropeltis Calman, 1912 (Crustacea: Branchiura) from Peru

FIGURE 2. Dipteropeltis longicaudatus sp. nov., adult holotype (MUSM 5128, specimen I.2). (A) Dorsal view. (B) Ventral view. Abbreviations: acf = anterior carapace field, af = abdomen field, ant = antenna, ce = compound eye, ir = interocular rod, ma = maxilla, mo = mouth, mx = maxillule, ne = nauplius eye, pcf = posterior carapace field, pos = pre-oral spine, sp = spermatheca. Scale bars = 2 mm.

FIGURE 8 in A new species of the fish louse genus Dipteropeltis Calman, 1912 (Crustacea: Branchiura) from Peru

FIGURE 8. Dipteropeltis longicaudatus sp. nov. juvenile specimen II.6, scanning electron micrographs. (A) Ventral view. The distances between legs here are smaller cf. Fig. 6B due to shrinkage during preservation. (B) Sucker rim showing zones (z1–3). (C) Mouth (labial spines are not visible from this view). (D) Antennae and antennule. Hornlike projections of ridges visible at top right. (E) Distal end of right maxilla, showing segments 3–6. (F) Spermathecal spines. Abbreviations: 3 = third segment, 4 = fourth segment, 5 = fifth segment, 6 = sixth segment, ant = antennae, antl = antennule, labi = labium, labr = labrum, lp = lateral protrusion, m = mandible, sp = spermatheca, ss = spermathecal spines. Scale bars: A = 300 µm, B = 15 µm, C = 30 µm, D = 50 µm, E = 20 µm, F = 10 μm.

FIGURE 7 in A new species of the fish louse genus Dipteropeltis Calman, 1912 (Crustacea: Branchiura) from Peru

FIGURE 7. Dipteropeltis longicaudatus sp. nov. juvenile specimen II.3. (A) Attached to host Brycon amazonicus, dorsal view. (B) Dorsal view. (C) Ventral view. All scale bars = 1 mm.

FIGURE 1 in A new species of the fish louse genus Dipteropeltis Calman, 1912 (Crustacea: Branchiura) from Peru

FIGURE 1. Samples were collected from the upper Tahuayo River within the Tamshiyacu Tahuayo Reserve in Peru. Within the black inset, the red box indicates the region where specimens were collected. Adult holotype (MUSM 5128, I.2) was collected at -4.394542, -73.264189. Inset scale bar = 2 km.

FIGURE 5 in A new species of the fish louse genus Dipteropeltis Calman, 1912 (Crustacea: Branchiura) from Peru

FIGURE 5. Dipteropeltis longicaudatus sp. nov., adult holotype (MUSM 5128, specimen I.2) structures in ventral view. (A) Right antenna and antennule. (B) Right maxilla. (C) Right legs 1–4. Abbreviations: 1 = first segment, 2 = second segment, 3 = third segment, 4 = fourth segment, 5 = fifth segment, 6 = sixth segment, ant = antenna, antl = antennule, bp = basipodite, cx = coxa, en = endopodite, ex = exopodite, L1 = first leg, L2 = second leg, L3 = third leg, L4 = fourth leg, nl = natatory lobe, pc = precoxa. Scale bars: A = 50 µm, B = 100 µm, C = 150 µm.