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14 results for “Megalonema”
Fig. 2 in Chromosomal analyses in Megalonema platanum (Siluriformes: Pimelodidae), an endangered species from South American rivers
Fig. 2. Somatic metaphases of Megalonema platanum submitted to treatment with AgNO 3 (a and b); FISH with 18S rDNA probe (c) and CMA 3 (d). Arrows indicate the NOR bearing chromosomes. The arrowheads indicate the secondary constriction. Detail in (d) shows the chromosome pair CMA positive.
Fig. 1 in Chromosomal analyses in Megalonema platanum (Siluriformes: Pimelodidae), an endangered species from South American rivers
Fig. 1. Karyotype (a) and somatic metaphases of Megalonema platinum with C-banding (b) rio Tibagi and (c) rio Paraná. In the box the supernumerary chromosome. The arrowheads in (b) and (c) indicate the chromosome pair with interstitial heterochromatin; the arrow in (b) indicate the supernumerary chromosome partially heterochromatic and the asterisks in (c) indicate the chromosomes with heterochromatin blocks in both terminal regions. Scale bar = 10μm
Fig. 7 in Two new cis-Andean species of the South American catfish genus Megalonema allied to trans-Andean Megalonema xanthum, with description of a new subgenus (Siluriformes: Pimelodidae)
Fig. 7. Megalonema orixanthum, holotype, Colombia, Meta State, río Metica, ca. 3 km SE of Hacienda Mozambique. ANSP 187449, 100 mm SL, in a, lateral, b, dorsal and c, ventral view; distal ends of barbels clipped from image c.
Fig. 6. Megalonema amaxanthum, a in Two new cis-Andean species of the South American catfish genus Megalonema allied to trans-Andean Megalonema xanthum, with description of a new subgenus (Siluriformes: Pimelodidae)
Fig. 6. Megalonema amaxanthum, a, lateral view of holotype, CBF 11896, 98 mm SL, b, lateral view of juvenile paratype, ANSP 187452, 39 mm SL, c, dorsal and d, ventral view of holotype; distal ends of barbels clipped from images c and d.
Fig. 5 in Two new cis-Andean species of the South American catfish genus Megalonema allied to trans-Andean Megalonema xanthum, with description of a new subgenus (Siluriformes: Pimelodidae)
Fig. 5. Scatter plots illustrating: a, anal-fin base length relative to standard length, and b, width between posterior nostrils relative to head length, in Megalonema xanthum (squares, n=23), M. amaxanthum (triangles, anal-fin base n=71, width between posterior nostrils n=70), and M. orixanthum (circles, n=41). In t-tests of the residuals from regression, M. amaxanthum proved to have a significantly longer anal-fin base length than M. orixanthum and M. xanthum (p-values <0.0001 for pairwise comparisons), and all three species are significantly different from each other in width between posterior nostrils with increasing relative widths from M. xanthum, M. amaxanthum to M. orixanthum (p-values for pairwise comparisons <0.0001).
Fig. 3 in Two new cis-Andean species of the South American catfish genus Megalonema allied to trans-Andean Megalonema xanthum, with description of a new subgenus (Siluriformes: Pimelodidae)
Fig. 3. Details of supraoccipital processes of a, Megalonema cf. platycephalum ANSP 178450, b, M. xanthum CAS 63674, c, M. amaxanthum, holotype, CBF 11896 (ex FMNH 106769), and d, M. orixanthum ANSP 148180, paratype. Paired lines on each image show the gap between the tip of supraoccipital process and supraneural anteromedial point in or just below skin.
Fig. 2 in Two new cis-Andean species of the South American catfish genus Megalonema allied to trans-Andean Megalonema xanthum, with description of a new subgenus (Siluriformes: Pimelodidae)
Fig. 2. Pelvic fins and basipterygia in Megalonema orixanthum, ANSP 187450, a, ventral view, b, dorsal view, and M. platycephalum, ANSP 189040, c, ventral view, d, dorsal view. alp = anterolateral process; amp = anteromedial process; bp = basal plate; dc = dorsal crest; pp = posterior process; r1-3 = pelvic-fin rays; vc = ventral crest.
Fig. 4. Megalonema xanthum, CAS 63674 in Two new cis-Andean species of the South American catfish genus Megalonema allied to trans-Andean Megalonema xanthum, with description of a new subgenus (Siluriformes: Pimelodidae)
Fig. 4. Megalonema xanthum, CAS 63674, paratype, 118 mm SL, in a, lateral, b, dorsal and c, ventral view.
Fig. 1. a in Two new cis-Andean species of the South American catfish genus Megalonema allied to trans-Andean Megalonema xanthum, with description of a new subgenus (Siluriformes: Pimelodidae)
Fig. 1. a, Weberian complex, post-Weberian vertebrae, basioccipital region and upper bones of shoulder girdle of Megalonema cf. platycephalum, ANSP 178515. b, Weberian complex and gas bladder of M. orixanthum, ANSP 187450. aoc = bony aortic canal; bocc = basioccipital; ccfl = ventral flange of compound centrum; tcom = position of gas bladder tubular commissure posterior to ventral flange; clr = cleithral ring; cpcv = position of bony canal for passage of posterior cardinal vein; gbld = lateral distention of gas bladder; gbtc = transverse commissure of gas bladder; ij5-6 = typical intervertebral joint between c5 and c6; tp4 = ventrally incomplete bony capsules surrounding lateral lobes of gas bladder formed by deeply down-curved 4th transverse processes of Weberian complex; c1, c5, c6, c7 = vertebrae designated by their ordinal numbers.
Fig. 5 in Description of the first species of Pseudoendorchis (Cestoda: Proteocephalidae) with uniloculate suckers from the pimelodid catfish Megalonema platycephalum, with comments on the taxonomic importance of the terminal vagina
Fig. 5 Line drawings of Pseudoendorchis megalonemi n. sp. from Megalonema platycephalum, Peru (A), Pseudoendorchis cristata Alves et al., 2021 from Pimelodella cristata, Brazil (B), Pseudoendorchis felipei Alves et al., 2021 from Pimelodus fur, Brazil (C), and Pseudoendorchis souzalimae Alves et al., 2021 from Pimelodus maculatus, Brazil (D). (A) Terminal genitalia, ventral view (IPCAS C-895). (B) Terminal genitalia, dorsal view, holotype (CHIOC 39466), modified from Alves et al. (2021a). (C) Terminal genitalia, ventral view (MHNG-PLAT-86927, paratype), modified from Alves et al. (2021a). (D) Terminal genitalia, ventral view (CHIOC 39471, paratype), modified from Alves et al. (2021a). Abbreviations: cc, chromophilic cells; ci, cirrus; cs, cirrus-sac; doc, dorsal osmoregulatory canal; mc, muscular cells; te, testis; va, vagina; vf, vitelline follicles; voc, ventral osmoregulatory canal.
Fig. 4 in Description of the first species of Pseudoendorchis (Cestoda: Proteocephalidae) with uniloculate suckers from the pimelodid catfish Megalonema platycephalum, with comments on the taxonomic importance of the terminal vagina
Fig. 4 Line drawings of Pseudoendorchis cristata Alves et al., 2021 from Pimelodella cristata, Brazil (A), Pseudoendorchis felipei Alves et al., 2021 from Pimelodus fur, Brazil (B), and Pseudoendorchis souzalimae Alves et al., 2021 from Pimelodus maculatus, Brazil (C). (A) Pregravid proglottid, dorsal view, holotype (CHIOC 39466), modified from Alves et al. (2021a). (B) Pregravid proglottid, ventral view (IPCAS C-856), modified from Alves et al. (2021a). (C) Pregravid proglottid, ventral view, holotype (CHIOC 39470), modified from Alves et al. (2021a). Abbreviations: Mg, Mehlis' gland; od, oviduct; oo, oocapt; ov, ovary; vd, viteloduct; voc, ventral osmoregulatory canal.
Fig. 2 in Description of the first species of Pseudoendorchis (Cestoda: Proteocephalidae) with uniloculate suckers from the pimelodid catfish Megalonema platycephalum, with comments on the taxonomic importance of the terminal vagina
Fig. 2 Line drawings of Pseudoendorchis megalonemi n. sp. from Megalonema platycephalum, Peru. (A) Scolex of a paratype (IPCAS C-895). (B) Scolex of holotype (MHNG-PLAT-0137396). (C) Pregravid proglottid, paratype (MHNG-PLAT-0137399), ventral view. (D, E) Serial sections at level of the posterior part of the proglottid, and at level of the ovary and Mehlis' gland, respectively (MHNG-PLAT-0121210). Abbreviations: doc, dorsal osmoregulatory canal; gc, gland cells; ilm, inner longitudinal musculature; Mg, Mehlis' gland; ov, ovary; te, testis; ut, uterus; vf, vitelline follicles; voc, ventral osmoregulatory canal.
Fig. 1 in Description of the first species of Pseudoendorchis (Cestoda: Proteocephalidae) with uniloculate suckers from the pimelodid catfish Megalonema platycephalum, with comments on the taxonomic importance of the terminal vagina
Fig. 1 Scanning electron micrographs of Pseudoendorchis megalonemi n. sp. from Megalonema platycephalum, Peru. (A) Scolex, frontal view. (B) Anterior (apical) part of scolex, latero-frontal view. (C) Strobila covered with numerous capilliform filitriches, interspersed with few gladiate spinitriches.
Fig. 3 in Description of the first species of Pseudoendorchis (Cestoda: Proteocephalidae) with uniloculate suckers from the pimelodid catfish Megalonema platycephalum, with comments on the taxonomic importance of the terminal vagina
Fig. 3 Line drawings of Pseudoendorchis megalonemi n. sp. from Megalonema platycephalum, Peru (A), and Pseudoendorchis auchenipteri (de Chambrier & Vaucher, 1999) from Auchenipterus osteomystax, Paraguay (B). (A) Gravid proglottid, holotype (MHNG-PLAT-0137399), ventral view. (B) Gravid proglottid, holotype (MHNG-PLAT-0024659), ventral view, modified from de Chambrier and Vaucher (1999). Abbreviations: Mg, Mehlis' gland; od, oviduct; oo, oocapt; ov, ovary; voc, ventral osmoregulatory canal.
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