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575 results for “Arthropoda”
Figure 2 in Sea spiders (Arthropoda: Pycnogonida) from waters adjacent to the Nansei Islands of Japan
Figure 2. Endeis leviseminentia sp. nov., holotype, male: (A) trunk, dorsal view; (B) trunk, lateral view; (C1) oviger; (C2) enlargement of distal end of oviger; (C3) enlargement of distal spines of oviger; (D) third leg; (E) enlargement of cement gland; (F) enlargement of distal segments of third leg. Scale bars: 1 mm (A–D, F); 0.1 mm (E).
Figure 3 in Sea spiders (Arthropoda: Pycnogonida) from waters adjacent to the Nansei Islands of Japan
Figure 3. Rhopalorhynchus tenuissimum (Haswell, 1884), male, except for C: (A) trunk, dorsal view; (B) trunk, lateral view; (C) proboscis, lateral view, female; (D) palp; (E) oviger; (F) strigilis, with enlargements of two types of spines; (G) third leg. Scale bars: 1 mm (A–E, G); 0.5 mm (F).
Figure 1 in Sea spiders (Arthropoda: Pycnogonida) from waters adjacent to the Nansei Islands of Japan
Figure 1. (Above) map of Japan showing the location of the Nansei Islands (box); (below) enlargement of box, showing the Nansei Islands and the collecting sites (filled circles).
Figure 12 in A limnological reconnaissance of the Falkland Islands; with particular reference to the waterfleas (Arthropoda: Anomopoda)
Figure 12. Bosmina (Neobosmina) chilensis, female, position of lateral head pore. Scale bar: 0.5 mm.
Figure 9 in Position and development of oocytes in velvet worms shed light on the evolution of the ovary in Onychophora and Arthropoda
Figure 9. Development of the endogenous ovary in Epiperipatus biolleyi. Transmission electron micrographs. A, position of the ovarian anlage beneath the presumptive heart and attached to the pericardial floor (pe) in an embryo with a full number of somites. Cross-section of the dorsal body. B, cross-section of an ovarian tube. Note the distinct separation into a germinal epithelium (ge), which contains the primordial germ cells (pgc), and a sterile epithelium (se). C, detail of the sterile epithelium. D, detail of the germinal epithelium. Arrowheads indicate apical junctions. Abbreviations: bl, basal lamina; ec, ectoderm; ge, germinal ovarian epithelium; hc, haemocoel; hl, lumen of the presumptive heart; lu, lumen of the ovarian anlage; me, outer layer of mesodermal cells that will later form the ovarian musculature; nu, nucleus; pe, presumptive pericardial floor; pgc, primordial germ cells; se, sterile ovarian epithelium.
Figure 7 in Position and development of oocytes in velvet worms shed light on the evolution of the ovary in Onychophora and Arthropoda
Figure 7. Internal organization of the endogenous ovary in Epiperipatus biolleyi. Light micrograph (A) and transmission electron micrographs (B–F). A, cross-section of the ovary (dorsal is up). Note the central position of ovarian lumen (lu) surrounded by germinal epithelium (ge) and the lack of a sterile epithelium. B, maturating oocyte (oc) from the germinal epithelium lying within a spherical chamber (ch), which is formed by specific cells (ce) of the germinal epithelium. C, detail of epithelial cells and an oocyte. Arrowheads indicate apical junctions. D, detail of the basal portion of the germinal epithelium with surrounding connective tissue containing muscle cells (mc). E, lower magnification of connective tissue showing numerous tracheal tubes (arrows). F, peripheral region of connective tissue containing tracheal tubes (tr) and flattened cells with an electron-dense content (fc). Abbreviations: bl, basal lamina; ce, cells of germinal epithelium that form the oocyte chamber; ch, oocyte chamber; ct, connective tissue; fc, flattened cell; ge, germinal epithelium; hc, haemocoel; lu, ovarian lumen; mc, muscle cells; mv, microvilli; nl, nucleolus; nu, nucleus; oc, maturating oocytes; tr, tracheal tubes.
Figure 5 in Position and development of oocytes in velvet worms shed light on the evolution of the ovary in Onychophora and Arthropoda
Figure 5. Internal organization of the exogenous ovary in Opisthopatus roseus (A–C, E, F) and Peripatopsis balfouri (D). Transmission electron micrographs. A, detail of ovarian epithelia and lumen. Arrowheads indicate apical junctions connecting epithelial cells. B, mitotically dividing oogonium (og) from the germinal epithelium. C, maturating oocyte (oc) with associated cells (ce) of modified germinal epithelium. Arrows point to the basal lamina which is strongly folded. D, maturating oc in the process of breaking through the connective tissue and growing out into the haemocoel. E, detail of dorsal ovarian wall showing the sterile epithelium (se) and the connective tissue (ct), which contains the musculature (mc). F, higher magnification of connective tissue showing muscle cells and collagen fibres. Abbreviations: bl, basal lamina; ce, cells associated with an oocyte (sometimes referred to as 'follicle cells' in the literature); cg, collagen fibres; ct, connective tissue; ge, germinal epithelium; hc, haemocoel; he, haemocyte; lu, ovarian lumen; mc, muscle cell; mt, mitochondria; mv, microvilli; nl, nucleolus; nu, nucleus; oc, maturating oocyte; og, oogonium; se, sterile epithelium; st, growing stalk.
Figure 4 in Position and development of oocytes in velvet worms shed light on the evolution of the ovary in Onychophora and Arthropoda
Figure 4. Internal organization of the exogenous ovary in Opisthopatus roseus (A, B) and Peripatopsis balfouri (C). Transmission electron micrographs. A, cross-section through the middle of the ovary. Dorsal is up. Note the unpaired lumen (lu) and the separation of the ovarian epithelium into a dorsal sterile epithelium (se) and a ventral germinal epithelium (ge). B, stalked oocytes enclosed by a vitelline membrane (= primary egg membrane). C, detail of a stalk. Arrows indicate intermediate filaments, arrowheads point to hemidesmosomes. Inset shows continuity of the basal lamina covering a stalk and a maturating oocyte that bulges into the haemocoel of the female. Abbreviations: bl, basal lamina; ct, connective tissue; ge, germinal epithelium; hc, haemocoel; lu, ovarian lumen; nl, nucleolus; nu, nucleus; oc, maturating oocytes; se, sterile epithelium; st, stalk; vm, vitelline membrane.
Figure 6 in Position and development of oocytes in velvet worms shed light on the evolution of the ovary in Onychophora and Arthropoda
Figure 6. Internal organization of the pseudoendogenous ovary in Metaperipatus inae (A–E) and Metaperipatus blainvillei (F). Light micrographs (A, B) and transmission electron micrographs (C–F). A, cross-section of the ovary (dorsal is up). Note the lateral position of the crescent-shaped ovarian lumen (lu) and the central position of the germinal epithelium (ge). B, detail of stalked oocytes (oc) from the germinal epithelium, which do not bulge into the haemocoel but retain their position within the ovary. C, detail of cells (ce) surrounding a maturating oocytes in the germinal epithelium. D, detail of a stalk. Arrows indicate the intermediate filaments. E, detail of the lumen and ovarian epithelia. The epithelial cells are connected by an apical junction (arrowhead). F, lateral ovarian wall consisting of the sterile epithelium (se) and connective tissue containing muscle cells (mc), a haemocyte (he), and sperm (sh). Abbreviations: bl, basal lamina; ce, cells associated with an oocyte; cg, collagen fibres; ct, connective tissue; ge, germinal epithelium; hc, haemocoel; he, haemocyte; lu, ovarian lumen; mc, muscle cell; mv, microvilli; nl, nucleolus; nu, nucleus; oc, maturating oocyte; se, sterile epithelium; sh, sperm head; st, stalk; sw, sterile ovarian wall.
Figure 3 in Position and development of oocytes in velvet worms shed light on the evolution of the ovary in Onychophora and Arthropoda
Figure 3. Diagram of internal organization of the three major ovarian types in Onychophora: exogenous ovary (A, D), pseudoendogenous ovary (B, E), and endogenous ovary (C, F). A, cross-section of the exogenous ovary with separate ovarian tubes that occur, e.g. in Euperipatoides rowelli, Phallocephale tallagandensis, and Ooperipatellus insignis (Australian Peripatopsidae). B, cross-section of the pseudoendogenous ovary of Metaperipatus inae (Peripatopsidae, Chile). C, cross-section of the endogenous ovary of Epiperipatus biolleyi (Peripatidae, Costa Rica). Note the complete lack of a sterile epithelium. D, detail of the composition of the ovarian wall in Opisthopatus roseus (Peripatopsidae, South Africa). E, detail of the ovary in Met. inae. F, detail of the ovarian wall in Ep. biolleyi. Abbreviations: bl, basal lamina; ct, connective tissue; fc, flattened cell; ge, germinal epithelium; hc, haemocoel; lu, ovarian lumen; mc, muscle cell; oc, oocyte; se, sterile epithelium; st, stalk; tr, tracheae.
Figure 1 in Position and development of oocytes in velvet worms shed light on the evolution of the ovary in Onychophora and Arthropoda
Figure 1. Simplified diagrams of paired versus variously fused structure of the ovarian tubes in Onychophora. Tissues are represented in light grey, ovarian lumen in dark grey. A, exogenous ovary of Typhloperipatus williamsoni (South-East Asian Peripatidae). Modified and complemented according to descriptions given by Kemp (1914). B–D, exogenous ovaries in three species of Peripatopsidae. B, Euperipatoides rowelli (Australia). Note the completely separate ovarian tubes in the middle of the ovary and the fused ovarian lumens at the anterior and posterior ends. A similar ovarian organization has been described in Peripatoides novaezealandiae from New Zealand (Sheldon, 1890: fig. 26). C, Peripatopsis balfouri (South Africa, cf. Fig. 2A). Although the ovarian tubes are fused, their lumens are separate along their entire length. D, Opisthopatus roseus (South Africa). Note the unpaired ovarian structure with a single lumen. E, pseudoendogenous ovary of Metaperipatus inae (Peripatopsidae, Chile, cf. Fig. 2B) with fused ovarian tubes but separate lumens. F, endogenous ovary of Epiperipatus biolleyi (Neotropical Peripatidae, cf. Fig. 2C) with lumens communicating only at the posterior end. G, endogenous ovary of Mesoperipatus tholloni (Peripatidae, Tropical Africa), modified and complemented after Bouvier (1905). Each ovarian tube is completely separate in this species.
Figure 10 in Position and development of oocytes in velvet worms shed light on the evolution of the ovary in Onychophora and Arthropoda
Figure 10. Mapping of three major types of onychophoran ovaries on simplified trees representing three different hypotheses on the phylogenetic relationships of Onychophora. Onychophoran subgroups are designated by their geographical distribution. Note that the suggestion of the exogenous type as an ancestral feature of Onychophora is consistent with all three phylogenetic hypotheses. A, both Peripatopsidae and Peripatidae are monophyletic (phylogeny modified from Monge-Nájera, 1995: fig. 10). B, Peripatidae are nonmonophyletic (phylogeny simplified from Reid, 1996: fig. 29). C, Peripatopsidae are nonmonophyletic (phylogeny simplified from Reid, 1996: fig. 28).
Fig. 29 in Sea spiders (Arthropoda: Pycnogonida) collected during the Madibenthos Expedition from Martinique shallow waters
Fig. 29. Pycnogonum cf. ornans Stock, 1992, ♀, MNHN-IU-2016-1064. A. Body, dorsal view. B. Body, lateral view (same scale as A). C. First leg. D. Tarsus and propodus of first leg.
Fig. 28 in Sea spiders (Arthropoda: Pycnogonida) collected during the Madibenthos Expedition from Martinique shallow waters
Fig. 28. Pycnogonum cesairei sp. nov., holotype, ♂, MNHN-IU-2016-10338. A. Body, dorsal view. B. Body, lateral view (same scale as A). C. Third leg. D. Oviger. E. Close-up of six terminal segments of oviger.
Fig. 26 in Sea spiders (Arthropoda: Pycnogonida) collected during the Madibenthos Expedition from Martinique shallow waters
Fig. 26. Anoplodactylus sp. 7, ♂, MNHN-IU-2016-1163. A. Body, dorsal view. B. Proboscis in ventral view (same scale as A). C. Oviger. D. Oviger terminal articles. E. Fourth leg. F. Tarsus and propodus of fourth leg. G. Propodal sole lamina. H. Chela.
Fig. 25 in Sea spiders (Arthropoda: Pycnogonida) collected during the Madibenthos Expedition from Martinique shallow waters
Fig. 25. Anoplodactylus sp. 4, ♀, MNHN-IU-2016-1165. A. Body, dorsal view. B. Body, lateral view (same scale as A). C. Fourth leg. D. Tarsus and propodus of fourth leg. E. Chela.
Fig. 27 in Sea spiders (Arthropoda: Pycnogonida) collected during the Madibenthos Expedition from Martinique shallow waters
Fig. 27. Anoplodactylus sp. 8, ♀, MNHN-IU-2016-1060. A. Body, dorsal view. B. Body, lateral view (same scale as A). C. Third leg. D. Tarsus and propodus of third leg. E. Chela.
Fig. 23 in Sea spiders (Arthropoda: Pycnogonida) collected during the Madibenthos Expedition from Martinique shallow waters
Fig. 23. Anoplodactylus madibenthos sp. nov., paratype, ♀, MNHN-IU-2016-1202. A. First leg. B. Third leg.
Fig. 22 in Sea spiders (Arthropoda: Pycnogonida) collected during the Madibenthos Expedition from Martinique shallow waters
Fig. 22. Comparison of Anoplodactylus madibenthos sp. nov. (A–J) and A. pectinus Hedgpeth, 1948 (K–L). A–J. Holotype, ♂, MNHN-IU-2016-1071. K–L. MNHN-IU-2016-1254. A. Body, dorsal view. B. Proboscis in ventral view. C. Body lateral view (same scale as A). D. Oviger. E. Chela. F. Third leg. G. Tarsus and propodus of third leg. H. Cement gland opening. I. First leg. J. Tarsus and propodus of first leg. K. Body, dorsal view. L. Proboscis in ventral view (same scale a A).
Fig. 24. Anoplodactylus micros Bourdillon, 1955 in Sea spiders (Arthropoda: Pycnogonida) collected during the Madibenthos Expedition from Martinique shallow waters
Fig. 24. Anoplodactylus micros Bourdillon, 1955, neotype, ♂, MNHN-IU-2016-1325. A. Body, dorsal view. B. Body, lateral view (same scale as A). C. Proboscis in ventral view (same scale as A). D. Ocular tubercle, frontal view. E. Oviger. F. Second leg. G. Cement gland opening of second leg. H. Coxa 2 of third leg. I. Tarsus and propodus of second leg. J. Chelifore.
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Allen Brain Atlas
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