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133 results for “lamprey”
Figure 1 from: Naseka AM, Renaud CB (2020) Morphology-based taxonomic re-assessment of the Arctic lamprey, Lethenteron camtschaticum (Tilesius, 1811) and taxonomic position of other members of the genus. ZooKeys 991: 1-67. https://doi.org/10.3897/zookeys.991.54938
Figure 1 Geographic distribution of the lamprey genus Lethenteron in Eurasia based strictly on the examination of type material of Petromyzon marinus camtschaticus (●), Petromyzon kessleri (■), Lampetra japonica septentrionalis (▲) and ZIN material identified by Berg (1931) as Lampetra japonica japonica (○), La. j. kessleri (□), and La. j. septentrionalis (∆). Note that the easternmost record of La. j. kessleri from the Anadyr Estuary has been re-identified as Le. camtschaticum.
Figure 2 from: Naseka AM, Renaud CB (2020) Morphology-based taxonomic re-assessment of the Arctic lamprey, Lethenteron camtschaticum (Tilesius, 1811) and taxonomic position of other members of the genus. ZooKeys 991: 1-67. https://doi.org/10.3897/zookeys.991.54938
Figure 2 Oral disc of neotype of Petromyzon marinus camtschaticus and lectotype of P. japonicus, ZMB 6475, 418.3 mm TL.
Data from: Neither philopatric nor panmictic: microsatellite and mtDNA evidence suggests lack of natal homing but limits to dispersal in Pacific lamprey
Most species with lengthy migrations display some degree of natal homing; some (e.g., migratory birds and anadromous salmonids) show spectacular feats of homing. However, studies of the sea lamprey (Petromyzon marinus) indicate that this anadromous species locates spawning habitat based on pheromonal cues from larvae rather than through philopatry. Previous genetic studies in the anadromous Pacific lamprey (Entosphenus tridentatus) have both supported and rejected the hypothesis of natal homing. To resolve this, we used nine microsatellite loci to examine population structure in 965 Pacific lamprey from 20 locations from central British Columbia to southern California, and supplemented this analysis with mitochondrial DNA restriction fragment length polymorphism analysis on a subset of 530 lamprey. Microsatellite analysis revealed: 1) relatively low but often statistically significant genetic differentiation among locations (97% pairwise FST values were less than 0.04 but 73.7% were significant); and 2) weak but significant isolation-by-distance (r2 = 0.0565, P = 0.0450) but no geographic clustering of samples. The few moderate FST values involved comparisons with sites that were geographically distant or far upstream. The mtDNA analysis—although providing less resolution among sites (only 4.7% FST values were significant)—was broadly consistent with the microsatellite results: 1) the southernmost site and some sites tributary to the Salish Sea were genetically distinct; and 2) southern sites showed higher haplotype and private haplotype richness. These results are inconsistent with philopatry, suggesting that anadromous lampreys are unusual among species with long migrations, but suggest that limited dispersal at sea precludes panmixia in this species.
Data from: Molecular diversity of Germany's freshwater fishes and lampreys assessed by DNA barcoding
This study represents the first comprehensive molecular assessment of freshwater fishes and lampreys from Germany. We analysed COI sequences for almost 80% of the species mentioned in the current German Red List. In total, 1056 DNA barcodes belonging to 92 species from all major drainages were used to (i) build a reliable DNA barcode reference library, (ii) test for phylogeographic patterns, (iii) check for the presence of barcode gaps between species and (iv) evaluate the performance of the barcode index number (BIN) system, available on the Barcode of Life Data Systems. For over 78% of all analysed species, DNA barcodes are a reliable means for identification, indicated by the presence of barcode gaps. An overlap between intra- and interspecific genetic distances was present in 19 species, six of which belong to the genus Coregonus. The Neighbour-Joining phenogram showed 60 nonoverlapping species clusters and three singleton species, which were related to 63 separate BIN numbers. Furthermore, Barbatula barbatula, Leucaspius delineatus, Phoxinus phoxinus and Squalius cephalus exhibited remarkable levels of cryptic diversity. In contrast, 11 clusters showed haplotype sharing, or low levels of divergence between species, hindering reliable identification. The analysis of our barcode library together with public data resulted in 89 BINs, of which 56% showed taxonomic conflicts. Most of these conflicts were caused by the use of synonymies, inadequate taxonomy or misidentifications. Moreover, our study increased the number of potential alien species in Germany from 14 to 21 and is therefore a valuable groundwork for further faunistic investigations.
Data from: microRNAs reveal the interrelationships of hagfish, lampreys, and gnathostomes and the nature of the ancestral vertebrate
Hagfish and lampreys are the only living representatives of the jawless vertebrates (agnathans), and compared with jawed vertebrates (gnathostomes), they provide insight into the embryology, genomics, and body plan of the ancestral vertebrate. However, this insight has been obscured by controversy over their interrelationships. Morphological cladistic analyses have identified lampreys and gnathostomes as closest relatives, whereas molecular phylogenetic studies recover a monophyletic Cyclostomata (hagfish and lampreys as closest relatives). Here, we show through deep sequencing of small RNA libraries, coupled with genomic surveys, that Cyclostomata is monophyletic: hagfish and lampreys share 4 unique microRNA families, 15 unique paralogues of more primitive microRNA families, and 22 unique substitutions to the mature gene products. Reanalysis of morphological data reveals that support for cyclostome paraphyly was based largely on incorrect character coding, and a revised dataset is not decisive on the mono- vs. paraphyly of cyclostomes. Furthermore, we show fundamental conservation of microRNA expression patterns among lamprey, hagfish, and gnathostome organs, implying that the role of microRNAs within specific organs is coincident with their appearance within the genome and is conserved through time. Together, these data support the monophyly of cyclostomes and suggest that the last common ancestor of all living vertebrates was a more complex organism than conventionally accepted by comparative morphologists and developmental biologists.
FIGURE 5 in Eudontomyzon graecus, a new nonparasitic lamprey species from Greece (Petromyzontiformes: Petromyzontidae)
FIGURE 5. Geographic distribution of Eudontomyzon graecus sp. n. (․) and E. hellenicus (●).
FIGURE 9 in Lampetra soljani, a new brook lamprey from the southern Adriatic Sea basin (Petromyzontiformes: Petromyzontidae)
FIGURE 9. Records of L. soljani. Numbers correspond to locality data given in Table 3.
FIG. 4 in A new look at the Cretaceous Lamprey Mesomyzon Chang, Zhang & Miao, 2006 from the Jehol Biota
FIG. 4. — Close-up of some anatomical structures of Mesomyzon Chang, Zhang & Miao, 2006: A, head of IVPP V 15035A; B, naso-hypophysial complex and adjacent structures of IVPP V 15449; C, oral disc and associated structures of IVPP V 15027A; D, details of gills and branchial skeleton of IVPP V 15449; E, details of the branchial apparatus of IVPP V 15027A; F, imprints of the brain and some cranial nerves of IVPP V 15450.3. Abbreviations: alc, anterior lateral cartilage; nhd, naso-hypophysial duct; fr, presumed position of fossa rhomboidea; g1, gill filaments of the first gill; nsc2, ventral spino-occipital radix nerve. See Figures 1 and 2 for other abbreviations. Scale bars: 5 mm.
FISH and IHC Images from: Molecular Characterization of the Sea Lamprey Retina Illuminates the Evolutionary Origin of Retinal Cell Types
<p>Fluorescence<em> in situ</em> hybridization and immunohistological images produced in this study.</p>
FIGURE 5 in Lethenteron ninae, a new nonparasitic lamprey species from the north-eastern Black Sea basin (Petromyzontiformes: Petromyzontidae)
FIGURE 5. Lethenteron ninae, paratype (ZISP 54435, TL 162.5 mm, Mokva River).
FIGURE 1 a-c in Lethenteron ninae, a new nonparasitic lamprey species from the north-eastern Black Sea basin (Petromyzontiformes: Petromyzontidae)
FIGURE 1 a-c. Measurement landmarks of a lamprey adult. For explanations see Table 1.
FIGURE 2 in Lethenteron ninae, a new nonparasitic lamprey species from the north-eastern Black Sea basin (Petromyzontiformes: Petromyzontidae)
FIGURE 2. Ammocoete of Lethenteron ninae, paratype (ZISP 54436, TL 126.9 mm, Mzymta River).
FIGURE 10 in Lethenteron ninae, a new nonparasitic lamprey species from the north-eastern Black Sea basin (Petromyzontiformes: Petromyzontidae)
FIGURE 10. Mzymta River (in the late autumn), a typical habitat of Lethenteron ninae.
Figure 4 from: Renaud CB, Naseka AM (2015) Redescription of the Far Eastern brook lamprey Lethenteron reissneri (Dybowski, 1869) (Petromyzontidae). ZooKeys 506: 75-93. https://doi.org/10.3897/zookeys.506.9817
Figure 4 - Oral disc of lampreys identified by Berg (1931) as Lethenteron reissneri without row of posterials. A ZIN 14457, Shangshi River, Songhua (Sungari) River system, People's Republic of China, 146 mm TL with complete posterial row comprising 24 unicuspid teeth (Pr1; only few of these teeth visible in photo). Note second row of posterials (Pr2). Two exolateral teeth additionally present on left side, one between first and second (E1) and other between second and third endolaterals (E2) B ZIN 15078 (re-identified as Lethenteron camtschaticum), Samarga River, near Sufren Cape, Russia, 178.0+ mm TL with complete posterial row comprising 18 unicuspid, 3 bicuspid, 1 unicuspid teeth (only few of these teeth visible in photo). Exolateral tooth present on right side between first and second endolaterals not visible because oral disc not fully open.
Figure 3 from: Renaud CB, Naseka AM (2015) Redescription of the Far Eastern brook lamprey Lethenteron reissneri (Dybowski, 1869) (Petromyzontidae). ZooKeys 506: 75-93. https://doi.org/10.3897/zookeys.506.9817
Figure 3 - Syntypes (ammocoetes) of Petromyzon reissneri Dybowski, NMW 78112, 106.5 mm (below); 122.2 mm TL (above). Arrows point to dark midline streak on tail.
Figure 1 from: Renaud CB, Naseka AM (2015) Redescription of the Far Eastern brook lamprey Lethenteron reissneri (Dybowski, 1869) (Petromyzontidae). ZooKeys 506: 75-93. https://doi.org/10.3897/zookeys.506.9817
Figure 1 - Geographic distribution of Lethenteron reissneri and material identified by Berg (1931) as Lethenteron reissneri without posterials. Approximate location of the type locality of Lethenteron reissneri, Amur River basin, Russia (solid star), topotypic localities in Russia and Mongolia (solid diamonds) and localities of material identified by Berg (1931) as Lethenteron reissneri: Shangshi River, Amur River basin, People's Republic of China (solid diamond), Sedanka River, Sea of Japan basin, Russia (solid square), and Samarga River, Sea of Japan basin, Russia (solid square). The Sedanka and Samarga River specimens were re-identified as Lethenteron camtschaticum.
Figure 2 from: Renaud CB, Naseka AM (2015) Redescription of the Far Eastern brook lamprey Lethenteron reissneri (Dybowski, 1869) (Petromyzontidae). ZooKeys 506: 75-93. https://doi.org/10.3897/zookeys.506.9817
Figure 2 - Syntype (adult) of Petromyzon reissneri Dybowski, 1869, ZMB 7118, 117.1 mm TL, Onon River.
Figure 3 in REVIEW Vertebrate origins are informed by larval lampreys (ammocoetes): a response to Miyashita et al., 2021
Figure 3. Endostyles in cross section. A, generalized transverse section through the pharynx, for orientation; B, amphioxus; C, ascidian tunicate; D, ammocoete. The three common cell types are colour-coded. Redrawn from Barrington & Sage (1972), Burighel et al. (2001) and Ogasawara et al. (2001).
Supplementary material 2 from: Nagy AA, Erős N, Imecs I, Bóné G, Fülöp A, Pap PL (2023) Distribution and diversity of fishes and lampreys in Transylvania (Romania): a complete survey and suggestions for new protected areas. ZooKeys 1166: 351-373. https://doi.org/10.3897/zookeys.1166.102854
Maps S1–S77
Supplementary material 1 from: Nagy AA, Erős N, Imecs I, Bóné G, Fülöp A, Pap PL (2023) Distribution and diversity of fishes and lampreys in Transylvania (Romania): a complete survey and suggestions for new protected areas. ZooKeys 1166: 351-373. https://doi.org/10.3897/zookeys.1166.102854
Raw data of sampling sites, fish and lamprey species and their numbers
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