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354 results for “Elasmobranchs”
FIGURE 1 in Records of new and rare elasmobranchs from Taiwan
FIGURE 1. Fishing ground (grey area) of deep-sea longliners and bottom trawlers that land at Da-xi or Cheng-gong markets.
Trends in elasmobranchs' feeding ecology studies - Data S1
<p>A listed of 599 papers used and fitted the criteria (i.e. feeding studies about elasmobranchs) were reviewed.</p>
Data from: Seasonality and relative abundance within an elasmobranch assemblage near a major biogeographic divide
<p>Nearshore waters are utilized by elasmobranchs in various ways, including foraging, reproduction, and migration. Multiple elasmobranch species have been previously documented in the nearshore waters of North Carolina, USA, which has a biogeographic break at Cape Hatteras on the Atlantic coast. However, comprehensive understanding of the elasmobranch community in this region is still lacking. Monthly year-round trawling conducted along two ocean transects (near Cape Lookout and Masonboro Inlet in 5 to 18 m depth) in Onslow Bay, North Carolina provided the opportunity to examine the dynamics and seasonal patterns of this community using a multivariate approach, including permutational multivariate analysis of variance and nonparametric BIO-ENV analysis. From November 2004 to April 2008, 21,149 elasmobranchs comprised of 20 species were caught, dominated by spiny dogfish (<em>Squalus acanthias</em>) and clearnose skate (<em>Rostroraja eglanteria</em>). All species exhibited seasonal variation in abundance, but several key species contributed the most to seasonal differences in species composition within each transect. Spiny dogfish was most abundant in the winter at both locations, comprised mainly of mature females. Although clearnose skate was caught in all seasons, the species was most abundant during the spring and fall. Atlantic sharpnose (<em>Rhizoprionodon terraenovae</em>) was one of the most abundant species in the summer, and two distinct size cohorts were documented. Temperature appeared to be the main abiotic factor driving the community assemblage. The extensive year-round sampling provided the ability to better understand the dramatic seasonal variation in species composition and highlights the relative abundance of several understudied elasmobranch species that may be of significant ecological importance. Our results underscore the importance of inner continental shelf waters as important elasmobranch habitat and provide baseline data to examine for future shifts in timing and community structure at the northern portion of the biogeographic break at Cape Hatteras.</p>
Figure 3 in A new subfamily for a clade of opecoelids (Trematoda: Digenea) exploiting marine fishes as second-intermediate hosts, with the first report of opecoelid metacercariae from an elasmobranch
Figure 3. The pylogenetic pattern of second-intermediate host groups, including Amphipoda, Cephalopoda, Chondricthyes, Decapoda, Echinoidea, Gastropoda, Hirudinea, Insecta, Oligochaeta and Osteichthyes, exploited by the Opecoelidae, constructed through maximum likelihood analysis of partial 28S ribosomal DNA data, with two brachycladioids forming the outgroup. Taxa in collapsed clades and GenBank accession numbers for all taxa are listed in Table 3. New sequence data are in bold. Support values <50% are omitted. Scale bar indicates the number of substitutions per site.
FIGURE 1 in Making Louis Agassiz's wish come true: combining forces and a new protocol for collecting comparative skeletal material of sharks, skates and rays, as a comment and an addition to ' The need of providing tooth morphology in descriptions of extant elasmobranch species' by Guinot et al. (2018)
FIGURE 1. Extract of a letter by Louis Agassiz to Spencer Fullerton Baird, October 18th, 1871 (Image #SIA2019-000779), courtesy of the Smithsonian Institution Archives (centre); 'Carte de visite' of L. Agassiz by E.B. Fay (c. 1870), courtesy of ERB Library (left); Cabinet card portrait (reversed) of S.F. Baird by H. Ulke (1878), courtesy of Swann Auction Galleries, sale 2344, lot 234 (right).
FIGURE 2 in Making Louis Agassiz's wish come true: combining forces and a new protocol for collecting comparative skeletal material of sharks, skates and rays, as a comment and an addition to ' The need of providing tooth morphology in descriptions of extant elasmobranch species' by Guinot et al. (2018)
FIGURE 2. Pateobatis jenkensii (Annandale, 1909), ERB 1097, male, 50.0 cm DW, 100.9 cm TL, caught off Kenya, illustrating a new protocol for collecting comparative skeletal material in sharks, skates and rays which includes photography (A–I), tissue sampling (J) and preservation of jaws at Elasmobranch Research Belgium (K); remaining voucher deposited and skeletonised at the Institut royal des Sciences naturelles de Belgique (L).
FIGURE 17 in New insights into the identities of the elasmobranch fauna of Sri Lanka
FIGURE 17. Echinorhinus sp. 1 (Echinorhinidae) (A–D), Hexanchus griseus (Hexanchidae) (E–H), and Chiloscyllium sp. 1 (Hemiscylliidae) (I–K). A. Lateral view of female (SL-108). B. Ventral view of head of female (SL-108). C. Teeth of upper jaw of female (SL-108). D. Teeth of lower jaw of female (SL-108). E. Lateral view of immature male (SL-106). F. Ventral view of head of female (SL-91). G. Teeth of upper jaw of female (SL-91). H. Teeth of lower jaw of female (SL-91). I. Lateral view of mature male. J. Ventral view of head of mature male (SL-59). K. Dorsal view of head and trunk of mature male (SL-59).
FIGURE 18 in New insights into the identities of the elasmobranch fauna of Sri Lanka
FIGURE 18. Centrophorus cf. atromarginatus (A–C) and Centrophorus uyato (D–F) (Centrophoridae). A. Lateral view of female (SL-87; BRT-I 0021). B. Ventral view of head of female (SL-87; BRT-I 0021). C. Denticles on left side below dorsal fin of female (SL-87; BRT-I 0014). D. Lateral view of female (SL-96; BRT-I 0026). E. Ventral view of head of female (SL-96; BRT-I 0026). F. Denticles on left side below dorsal fin of female (SL-96; BRT-I 0026).
FIGURE 19 in New insights into the identities of the elasmobranch fauna of Sri Lanka
FIGURE 19. Centroscymnus owstonii (Somniosidae). A. Lateral view of mature male (SL-93; BRT-I 0024). B. Ventral view of mature male (SL-93; BRT-I 0024). C. Teeth of upper and lower jaw of mature male (SL-93; BRT-I 0024).
FIGURE 14 in New insights into the identities of the elasmobranch fauna of Sri Lanka
FIGURE 14. Carcharhinus amblyrhyncoides (A–D) and C. cf. limbatus (E–H) (Carcharhinidae), and Rhizoprionodon acutus (I–J) and Rhizoprionodon oligolinx (K–L). A. Lateral view of female (SL-18). B. Ventral view of head of female (SL-18). C. Teeth of upper jaw of female (SL-18). D. Teeth of lower jaw of female (SL-18). E. Lateral view of immature female (SL- 52). F. Ventral view of head of immature female (SL-52). G. Teeth of upper jaw of immature female (SL-52). H. Teeth of lower jaw of immature female (SL-52). I. Lateral view of mature female (SL-21). J. Ventral view of head of mature female (SL-21). K. Lateral view of maturing male (SL-22). L. Ventral view of head of mature male (SL-53).
FIGURE 15 in New insights into the identities of the elasmobranch fauna of Sri Lanka
FIGURE 15. Hemipristis elongata (Hemigaleidae) (A–D) and Planonasus indicus (Pseudotriakidae) (E–H). A. Lateral view of immature male (SL-78; BRT-I 0018). B. Falcate pectoral fins of immature male (ventral view; SL-78; BRT-I 0018). C. Ventral view of head of immature male (SL-78). D. Teeth of upper jaw of immature male (SL-78; BRT-I 0018). E. Lateral view of mature female (SL-107; BRT-I 0029). F. Ventral view of head of mature female (SL-107; BRT-I 0029). G. Teeth of upper and lower jaw of mature female (SL-107; BRT-I 0029). H. Denticles on left side below dorsal fin of mature female (SL- 107; BRT-I 0029).
FIGURE 1 in New insights into the identities of the elasmobranch fauna of Sri Lanka
FIGURE 1. Map indicating collecting localities. North Western Province: Puttalam (1); Baththalangunduwa Island (2); Palkanththura (3); Pukulam landing site (4). Northern Province: Vankalai (5); Gurunagar market (6), Jaffna; near Erinchamman Kovilady market, Supparmadam market, Kottadi market, and Munai market (7–10), Point Pedro. Eastern Province: Mutur landing site (11), Mutur; Valaichchenai Fisheries Harbour and main landing site Valaichchenai (12, 13), Valaichchenai. Western Province: Peliyagoda fish market (14), Colombo; Negombo fish market (15), Negombo. Map source: Google Earth (Data SIO, NOAA, U.S. Navy, NGA, GEBCO; Image Landsat/Copernicus); copyright 2018 Google.
FIGURE 12 in New insights into the identities of the elasmobranch fauna of Sri Lanka
FIGURE 12. Acroteriobatus variegatus (A, B) and Rhinobatos annandalei (C, D) (Rhinobatidae). A. Dorsal surface of immature male (SL-99; BRT-I 0027). B. Ventral snout and oronasal region of immature male (SL-99; BRT-I 0027). C. Dorsal surface of female (SL-115; BRT-I 0003). D. Ventral snout and oronasal region of female (SL-115; BRT-I 0003). E. Dorsal surface of immature male (SL-28). F. Oronasal region of immature male (SL-28).
FIGURE 5 in New insights into the identities of the elasmobranch fauna of Sri Lanka
FIGURE 5. Neighbor-Joining trees of p-distances based on 1,044 bp of aligned NADH2 sequence data for individual selachian genera or groups of genera. Taxon names are followed by country, host specimen number (in parentheses), and GenBank number. Outgroup taxa used in each analysis were omitted from the individual trees. Scale bar values indicate substitutions per site. Specimens deposited in the Blue Resources Trust Ichthyology Collection are indicted by stars (see text for details). A. Echinorhinidae. B. Hexanchidae. C. Lamniformes. D. Chiloscyllium (Hemiscylliidae). E. Centrophorus (Centrophoridae). F. Somniosidae/Oxynotidae (Somniosus omitted).
FIGURE 3 in New insights into the identities of the elasmobranch fauna of Sri Lanka
FIGURE 3. Neighbor-Joining trees of p-distances based on 1,044 bp of aligned NADH2 sequence data for individual batoid genera or groups of genera. Taxon names are followed by country, host specimen number (in parentheses), and GenBank number. Outgroup taxa used in each analysis were omitted from the individual trees. Scale bar values indicate substitutions per site. Specimens deposited in the Blue Resources Trust Ichthyology Collection are indicted by stars (see text for details). A. Gymnura (Gymnuridae). B. Rhinoptera (Rhinopteridae). C. Acroteriobatus and Rhinobatos (Rhinobatidae). D. Torpediniformes.
FIGURE 7 in New insights into the identities of the elasmobranch fauna of Sri Lanka
FIGURE 7. Himantura tutul (A–C) and Himantura undulata (D) (Dasyatidae). A. Dorsal surface of mature female (SL-8); inset showing scapular denticles. B. Dorsal surface of mature female (SL-42); inset showing scapular denticles. C. Dorsal surface of immature male (SL-34); inset showing scapular denticles. D. Dorsal surface of immature male (SL-33); inset showing scapular denticles.
FIGURE 2 in New insights into the identities of the elasmobranch fauna of Sri Lanka
FIGURE 2. Neighbor-Joining trees of p-distances based on 1,044 bp of aligned NADH2 sequence data for individual batoid genera or groups of genera. Taxon names are followed by country, host specimen number (in parentheses), and GenBank number. Outgroup taxa used in each analysis were omitted from the individual trees. Scale bar values indicate substitutions per site. Specimens deposited in the Blue Resources Trust Ichthyology Collection are indicted by stars (see text for details). A. Aetobatus (Aetobatidae). B. Brevitrygon (Dasyatidae). C. Himantura (Dasyatidae). D. Maculabatis (Dasyatidae). E. Neotrygon (Dasyatidae). F. Pastinachus (Dasyatidae). G. Pateobatis (Dasyatidae). H. Urogymnus (Dasyatidae).
FIGURE 6 in New insights into the identities of the elasmobranch fauna of Sri Lanka
FIGURE 6. Aetobatus ocellatus (Aetobatidae) (A–B) and Brevitrygon sp. 1 (Dasyatidae) (C–D). A. Dorsal surface of immature male (SL-26). B. Dorsal surface of mature female (SL-41). C. Dorsal surface of maturing male. D. Thorns and denticles on base of tail of mature male (dorsal surface; SL-36).
FIGURE 10 in New insights into the identities of the elasmobranch fauna of Sri Lanka
FIGURE 10. Pateobatis jenkinsii (A–C) and Urogymnus granulatus (D–H) (Dasyatidae). A. Dorsal surface of mature female (SL-98). B. Wedge-shaped thorns and denticles on base of tail of mature female (SL-43). C. Dorsal surface of immature male (SL-101; BRT-I 0028). D. Dorsal surface of portion of disc of large specimen (partial; SL-13). E. Thorns and denticles on base of tail of mature specimen (SL-13). F. Ventral surface of portion of disc of large specimen (partial; SL-13). G. Dorsal surface of immature female (SL-116; BRT-I 0030). H. Scapular denticles of immature female (SL-116; BRT-I 0030).
Figure 5. Lepeophtheirus acutus Heegaard, 1943 in Redescription of Lepeophtheirus acutus Heegaard, 1943 (Copepoda: Caligidae) parasitic on two elasmobranch hosts off Okinawa-jima Island, Japan
Figure 5. Lepeophtheirus acutus Heegaard, 1943 infections on the Alfred manta Manta alfredi (Krefft, 1868) held in sea pens off the western coastline of Okinawa-jima Island, Japan. (A) Clusters of L. acutus (indicated by arrowheads) around the left eye of M. alfredi (no. 21) on 5 October 2009; and (B) clusters of L. acutus (indicated by arrowheads) on and around the underside of the pelvic fins of M. alfredi (no. 22) on 29 September 2009.
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