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294 results for “Nemertea”
Figure 3 in Genus Baseodiscus (Nemertea: Heteronemertea): Molecular identification of a new species in a phylogenetic context
Figure 3. External view of Baseodiscus jonasii sp. nov. Drawing made by Ray Gibson.
Figure 1 in Swedish nemerteans (phylum Nemertea), with description of a new hoplonemertean genus and species
Figure 1. Map of Sweden with the sampled area on the Swedish west coast marked.
Figure 5 in Character-matrix based descriptions of two new nemertean (Nemertea) species
Figure 5. Carinina ochracea sp. nov. (living specimen).
Figure 8 in Character-matrix based descriptions of two new nemertean (Nemertea) species
Figure 8. Stylet and stylet basis of Raygibsonia bergi gen. et sp. nov.
FIGURE 1 in A histology-free description of a new species of the genus Tetrastemma (Nemertea: Hoplonemertea: Monostilifera) from Hawaii and India
FIGURE 1. Tetrastemma freyae sp. nov. (A, B) holotype: lateral view of the head with everted proboscis (A) and dorsal view of the anterior body (B). (C, F, G) paratype: dorsal view of the anterior body (C); stylet apparatus (F, G). (D, E) two specimens from India, dorsal view (E, squeezed specimen under cover glass). Scale bars: (A-C), 0.5 mm; (D, E), 1 mm; (F), 100 µm; (G), 50 µm.
FIGURE 4 in Redescription of Cerebratulus marginatus auct. (Nemertea: Pilidiophora) from Hokkaido, Japan, as a new species
FIGURE 4. Cerebratulus orochi sp. nov., ICHUM 6078 (holotype). (A–E) Transverse sections through post-cerebral, pre-oral region, showing the morphology of various blood vessels; black arrowhead on (B) pointing to anterolateral diverticula from sub-rhynchocoelic vessel. (F) Magnification of (B), showing the interwoven longitudinal and circular muscle fibres in the rhynchocoel wall under vascular plug; asterisks (*) indicate lumen of anterolateral diverticula from sub-rhynchocoelic vessel. (G) Transverse section through the foregut region showing the vascular plug. (H) Magnification of (G), showing (1) rhynchocoel inner longitudinal muscle, (2) rhynchocoel outer circular muscle, (3) longitudinal muscle plate, and (4) transverse muscle above foregut.
FIGURE 8 in Redescription of Cerebratulus marginatus auct. (Nemertea: Pilidiophora) from Hokkaido, Japan, as a new species
FIGURE 8. An unrooted maximum-likelihood tree based on T92 + G model with 496-bp partial sequences of the 16S rRNA gene from Cerebratulus orochi sp. nov. and 10 other DDBJ/EMBL/GenBank entries that showed highest max/total scores as a result of a MegaBLAST search (Morgulis et al. 2008) at the NCBI website (https://blast.ncbi.nlm.nih.gov). Numbers near nodes show bootstrap values with 1000 replicates. Red horizontal bars indicate conspecifics according to species delimitation analyses by employing ABGD (Puillandre et al. 2012) and PTP (Zhang et al. 2013), which resulted in the same outcome.
FIGURE 3 in Redescription of Cerebratulus marginatus auct. (Nemertea: Pilidiophora) from Hokkaido, Japan, as a new species
FIGURE 3. Cerebratulus orochi sp. nov., ICHUM 6078 (holotype). (A) Transverse section through intestinal region showing ovary containing mature oocytes. (B) Transverse section through intestinal region showing dorsoventral muscles (indicated by black arrowheads) running both proximal and lateral to lateral nerve cord; white arrowhead showing lateral edge of body. (C) Transverse section through proboscis showing heterotype musculature. (D) Transverse section through proboscis showing muscle cross (indicated by white arrowheads). (E) Pseudocnidae.
FIGURE 2 in Redescription of Cerebratulus marginatus auct. (Nemertea: Pilidiophora) from Hokkaido, Japan, as a new species
FIGURE 2. Cerebratulus orochi sp. nov., ICHUM 6078 (holotype). (A) Transverse section through foregut region showing body-wall musculature; asterisk (*) indicating rhynchocoel outer circular muscle; black arrowhead pointing to rhynchocoel inner longitudinal muscle. (B) Transverse section through foregut region showing cutis structure; arrowheads indicating diagonal muscles. (C) Tangential section through foregut region showing subepidermal musculature. (D) Tangential section through intestinal region showing subepidermal musculature. (E) Transverse section through precerebral region.
FIGURE 1 in Redescription of Cerebratulus marginatus auct. (Nemertea: Pilidiophora) from Hokkaido, Japan, as a new species
FIGURE 1. Cerebratulus orochi sp. nov., ICHUM 6078 (holotype), photographs taken in life under anaesthetized state by Yuki Oya. (A) Entire body. (B) Head, ventral view. (C) Magnification of rhynchodaeal opening. (D) Tail.
FIGURE 7. A in Redescription of Cerebratulus marginatus auct. (Nemertea: Pilidiophora) from Hokkaido, Japan, as a new species
FIGURE 7. A maximum-likelihood (ML) tree showing the phylogenetic position of Cerebratulus orochi sp. nov. among the "Cerebratulus clade" (Chernyshev & Polyakova 2019) based on concatenated 16S rRNA, COI, 18S rRNA, 28S rRNA, and histone H3 genes. Nodal support is represented by ML bootstrap value with 1000 replicates and Bayesian posterior probability; solid, black circles indicate full support.
FIGURE 6 in Redescription of Cerebratulus marginatus auct. (Nemertea: Pilidiophora) from Hokkaido, Japan, as a new species
FIGURE 6. Cerebratulus orochi sp. nov., ICHUM 6078 (holotype). (A) Transverse section through brain. (B) Transverse section through foregut region showing lateral nerve cord; white arrowheads indicating muscle fibres; black arrowheads showing radial muscle fibres. (C) Transverse section through foregut region showing excretory collecting tubules; black arrowheads showing somatic muscles.
FIGURE 5 in Redescription of Cerebratulus marginatus auct. (Nemertea: Pilidiophora) from Hokkaido, Japan, as a new species
FIGURE 5. Cerebratulus orochi sp. nov., ICHUM 6078 (holotype). (A) Transverse section through posterior region of brain. (B) Magnification of (A) showing different types of neuronal cells. (C) Magnification of (A) showing neurochord cell. (D) Transverse section through anterior tip of head showing three frontal organs.
FIGURE 9 in Redescription of Cerebratulus marginatus auct. (Nemertea: Pilidiophora) from Hokkaido, Japan, as a new species
FIGURE 9. An unrooted maximum-likelihood tree based on HKY + I model with 583-bp partial sequences of the COI gene from Cerebratulus orochi sp. nov. and 10 other DDBJ/EMBL/GenBank entries that showed highest max/total scores as a result of a MegaBLAST search (Morgulis et al. 2008) at the NCBI website (https://blast.ncbi.nlm.nih.gov). Numbers near nodes show bootstrap values with 1000 replicates. Red horizontal bars indicate conspecifics according to species delimitation analyses by employing ABGD (Puillandre et al. 2012) and PTP (Zhang et al. 2013), which resulted in the same outcome.
FIGURE 4 in An integrative description of a new Cephalothrix species (Nemertea: Palaeonemertea) from the South China Sea
FIGURE 4. Bayesian inference multi-locus cladogram of nemerteans. Numbers near the branches are the nodal support values (ML bootstrap value/Bayesian posterior probability). Solid circles indicate nodal support of 100/1.0.
FIGURE 3 in An integrative description of a new Cephalothrix species (Nemertea: Palaeonemertea) from the South China Sea
FIGURE 3 Cephalothrix suni sp. nov. (A-H) transverse histological sections of the holotype: precerebral region (arrows indicate four precerebral nerves) (A); cerebral region (arrow indicates rhynchocoel vessel) (B); postcerebral region (arrow indicates median ventral nerve) (C); preoral region (arrows indicate bifurcation of the median ventral nerve) (D); mouth region (arrows indicate two buccal nerves) (E); anterior foregut region (arrows indicate two buccal nerves) (F); anterior foregut region (arrows indicate joining of the buccal nerves) (F); middle foregut region (H). (I) thick transverse section in glycerol. Abbreviations: br, brain; cv, cephalic vessel; fg, foregut; ln, lateral nerve cord; lv, lateral vessel; m, mouth; pr, proboscis; rd, rhynchodaeum. Scale bars: 50 µm.
FIGURE 2 in An integrative description of a new Cephalothrix species (Nemertea: Palaeonemertea) from the South China Sea
FIGURE 2. Cephalothrix suni sp. nov., cLSM micrographs of the body and proboscis labelled with phalloidin: substack of transverse sections through the anterior foregut region (A, B, E), arrows indicate the inner part of the split OCM (B); substack of transverse sections through the posterior foregut region (C); substack of longitudinal sections through the body-wall musculature with crisscrossed DM in the foregut region (D); substack of transverse sections through the anterior foregut region (arrow indicate dorsal muscle cross) (F); substack of longitudinal sections through the proboscis musculature (arrows indicate DM) (G); substack of longitudinal sections through the proboscis epithelium with larger (arrows) and smaller (arrowheads) pseudocnidae (H); substack of longitudinal sections through the proboscis epithelium with long (arrowheads) and shorter (arrows) collars of sensory cells (I). Abbreviations: dm, diagonal musculature; dn, dorsal nerve; fg, foregut; icm, inner circular musculature; lm, longitudinal musculature; ln, lateral nerve cord; lp, longitudinal muscle plate; lv, lateral blood vessel; ocm, outer circular musculature; olm, outer part of LM; pr, proboscis; rh, rhynchocoel; vm, musculature of blood vessel. Scale bars: A, C – 100 µm; B, D–F – 50 µm; G, I – 20 µm; H – 10 µm.
FIGURE 1 in An integrative description of a new Cephalothrix species (Nemertea: Palaeonemertea) from the South China Sea
FIGURE 1. Cephalothrix suni sp. nov. (A) holotype: ventral view. (B) paratype: ventral view of the anterior body. Scale bars: (A), 2 mm; (B), 1 mm.
FIGURE 5. A–D in Higher classification of the Monostilifera (Nemertea: Hoplonemertea)
FIGURE 5. A–D, drawings of specimens referred to as Tetrastemma flavidum Ehrenberg, 1828 by different authors; E, Nemertellina yamaokai Kajihara et al., 2001. A, reproduced from Ehrenberg (1828–1831); head, dorsal view (right); anterior fragment of body (middle); posterior end (left); the eyes are anteroposteriorly separated; the rhynchocoel appears to extend half body length at most. B, reproduced from McIntosh (1873–1874); this species is commonly regarded by subsequent authors (e.g., Beaumont 1900; Wijnhoff 1912) as belonging in Nemertopsis Bürger, 1895; the rhynchocoel extends 2/3 of body in this species (Beaumont 1900). C, reproduced from Bürger (1895); the rhynchocoel extends into the posterior region of the body. D, reproduced with permission (license number: 4636460733834) from Strand & Sundberg (2005b, fig. 1A) (© 2005 Oxford University Press); the eyes are arranged at the corners of a square. E, reproduced from Yamaoka (1940); anterior body, dorsal view (right); head, ventral view (left); the eyes are anteroposteriorly widely separated; the rhynchocoel is 30–60% of the body length (Kajihara et al. 2001). A–C and E are in the public domain.
FIGURE 4. Malacobdella japonica Takakura, 1897 in Higher classification of the Monostilifera (Nemertea: Hoplonemertea)
FIGURE 4. Malacobdella japonica Takakura, 1897 (ICHUM 5973), transverse sections through ventral rhynchocoel wall; A, anterior end, branch from mid-dorsal vessel, with basophilic contents (arrowhead); B, mid-dorsal vessel (arrowhead), 24 µm posterior to A; C, D, another branch (black arrowheads) with basophilic contents, sent off from mid-dorsal vessel (white arrowheads), 208–232 µm posterior to A. Scale bar: 20 µm (A–D).
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