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FIGURE 6 in A new species of Pontonema (Oncholaimidae, Nematoda) and a redescription of Pontonema incisum Wieser, 1953 from Santa Cruz and Chubut Provinces, Argentina

FIGURE 6. Male of Pontonema incisum. A. Entire; B. Head, buccal cavity and teeth; C. Amphideal fovea; D. Copulatory apparatus, spicules, gubernaculum and precloacal sensory field. Scale bar: A = 50 µm; B–D= 20 µm.

FIGURE 3 in A new species of Pontonema (Oncholaimidae, Nematoda) and a redescription of Pontonema incisum Wieser, 1953 from Santa Cruz and Chubut Provinces, Argentina

FIGURE 3. Holotype male of Pontonema golfonuevensis sp. nov. A. Entire; B. Head, buccal cavity and teeth; C. Amphideal fovea; D. Copulatory apparatus, spicules, gubernaculum and precloacal sensory field. Scale bar: A = 50 µm; B–D= 20 µm.

FIGURE 2 in A new species of Pontonema (Oncholaimidae, Nematoda) and a redescription of Pontonema incisum Wieser, 1953 from Santa Cruz and Chubut Provinces, Argentina

FIGURE 2. Holotype male of Pontonema golfonuevensis sp. nov. A. Head, buccal cavity and teeth; B. Amphideal fovea and cephalic setae; C. Copulatory apparatus, spicules, gubernaculum and precloacal sensory field; D. Posterior end. Scale bar: A– D= 20 µm.

FIGURE 5 in A new species of Pontonema (Oncholaimidae, Nematoda) and a redescription of Pontonema incisum Wieser, 1953 from Santa Cruz and Chubut Provinces, Argentina

FIGURE 5. Male of Pontonema incisum. A. Amphideal fovea and cephalic setae; B. Copulatory apparatus, spicules, gubernaculum and precloacal sensory field; C. Head, buccal cavity and teeth; D. Posterior end. Scale bar: A–D = 20 µm.

FIGURE 1 in A new species of Pontonema (Oncholaimidae, Nematoda) and a redescription of Pontonema incisum Wieser, 1953 from Santa Cruz and Chubut Provinces, Argentina

FIGURE 1. Map of the sampling areas: A) Golfo Nuevo and "Golfito" in Chubut Province; B) "Isla de los Pájaros" and "Punta Cascajo" in Santa Cruz Province.

FIGURE 4 in A new species of Pontonema (Oncholaimidae, Nematoda) and a redescription of Pontonema incisum Wieser, 1953 from Santa Cruz and Chubut Provinces, Argentina

FIGURE 4. Female of Pontonema incisum. A. Amphideal fovea and cephalic setae; B. Posterior end; C. Head, buccal cavity and teeth; D. Vulva. Scale bar: A–C = 20 µm; D= 100 µm.

FIG. 5 in Sibling species in the marine pollution indicator genus Pontonema (Nematoda: Oncholaimidae), with a description of mediterranea sp. nov.

FIG. 5. Pontonema mediterranea sp. nov. (a) Lateral view of male head-end; (b) lateral view of male tail-end; (c) lateral view of female tail.

FIG. 2 in Sibling species in the marine pollution indicator genus Pontonema (Nematoda: Oncholaimidae), with a description of mediterranea sp. nov.

FIG. 2. Multidimensional scaling (MDS) ordination for Pontonema males (upper) and females (lower) based on the complete character set. Dissimilarity measure for data is normalized Euclidean distance. Stress in both cases = 0.13. Sites K, C, T, S, G and B correspond to Kiel fjord, Cornelian Bay, Tyne Estuary, SeÁte, Garroch Head (Firth of Clyde) and Bay of Blanes, respectively.

FIG. 3 in Sibling species in the marine pollution indicator genus Pontonema (Nematoda: Oncholaimidae), with a description of mediterranea sp. nov.

FIG. 3. Multidimensional scaling (MDS) ordinations for Pontonema males based on character subsets. Dissimilarity measure for data is normalized Euclidean distance. Sites K, C, T, S, G and B correspond to Kiel fjord, Cornelian Bay, Tyne Estuary, SeÁte, Garroch Head (Firth of Clyde) and Bay of Blanes, respectively. (a) Ordination of character 15, stress= 0.17; (b) ordination of characters 7 and 15, stress = 0.02; (c) ordination of characters 3, 7 and 15, stress = 0.07; (d) ordination of characters 1, 7, 12 and 15, stress= 0.10.

FIG. 1 in Sibling species in the marine pollution indicator genus Pontonema (Nematoda: Oncholaimidae), with a description of mediterranea sp. nov.

FIG. 1. Diagrammatic representation of the characters quanti®ed. Based on P. alaeospicula as drawn by Bett and Moore (1988). The broken lines indicate the character measurements, and the numbers correspond to the character names as given in table 1. (a) Anterior oesophageal region, to extent of nerve ring. (b) Anterior region. Second subventral tooth is obscured by ®rst. The obvious characters of body length, maximum body diameter and length from vulva to anterior are not represented. (c) Posterior end male. (d) Posterior end female.

FIG. 4 in Sibling species in the marine pollution indicator genus Pontonema (Nematoda: Oncholaimidae), with a description of mediterranea sp. nov.

FIG. 4. Multidimensional scaling (MDS) ordinations for Pontonema females based on character subsets. Dissimilarity measure for data is normalized Euclidean distance. Sites K, C, T, S, G and B correspond to Kiel fjord, Cornelian Bay, Tyne Estuary, SeÁte, Garroch Head (Firth of Clyde) and Bay of Blanes, respectively. (a) Ordination of character 6, stress= 0.23; (b) ordination of characters 1 and 6, stress = 0.00; (c) ordination of characters 1, 8 and 9, stress = 0.09; (d) ordination of characters 1, 8, 9 and 10, stress= 0.17.