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11 results for “Chitonidae”
FIG. 2. — Acanthochitona oxum n in Taxonomic study on the Polyplacophora (Chitonida: Ischnochitonidae et Acanthochitonidae) collected by the Marion Dufresne (MD55) expedition, with description of a new species
FIG. 2. — Acanthochitona oxum n. sp.; dorsal view; A, valve i; B, valve v; C, valve viii; D, E: details of the valve v, showing pustules with aesthetes (D) and detail of a pustule (E); F, details of the perinotum; G‒H: detail of the radula, radula, panoramic (G) and dorsal (H) views; I, details of the hyponotum. Scale bars: A-C, 100 μm; D, I, 20 μm; E, 3 μm; F, 100 μm; G, 30 μm; H, 10 μm.
FIG. 1. — A‒E in Taxonomic study on the Polyplacophora (Chitonida: Ischnochitonidae et Acanthochitonidae) collected by the Marion Dufresne (MD55) expedition, with description of a new species
FIG. 1. — A‒E, Stenoplax marcusi (Righi, 1971); A, B, lateral view; C, frontal view; D, dorsal view; E, posterior view; F-J. Acanthochitona terezae Guerra-Junior, 1983; F, G, lateral view; H, frontal view; I, dorsal view; J, posterior view; K‒O, Acanthochitona ciroi Righi, 1971; K, L, lateral view; M, frontal view; N, dorsal view; O, posterior view; P‒T, Acanthochitona oxum n. sp.; P‒Q, lateral view; R, frontal view; S, dorsal view; T, posterior view. Scale bars: 1 mm.
FIGURE 1 in Tonicia atrata and Chiton cumingsii (Polyplacophora: Chitonidae): First records in European waters
FIGURE 1. European alien Polyplacophora. Colour polymorphisms in Tonicia atrata specimens A—BOS-CHI15; B—BOS-CHI10; C—BOS-CHI12; D—Chiton cumingsii BOS-CHI16. All scale bars 1 cm.
FIGURE 2. A, C–G in On the pea crabs found in the chiton Tonicia chilensis (Frembly, 1827) (Mollusca, Polyplacophora: Chitonidae) identified as "Orthotheres sp." by Melzer & Schwabe (2008), and its reassignment to Calyptraeotheres Campos, 1990 (Crustacea: Pinnotheridae)
FIGURE 2. A, C–G, third maxilliped, outer view; B, juvenile, dorsal view, carapace width 1.5 mm. A, B, Dissodactylus lockingtoni Smith, 1870, Puerto Peñasco, Sonora, México and Campo El Pescador, San Felipe, Baja California, México, respectively; C, Clypeasterophilus rugatus (Bouvier, 1917), Jamaica; D, E, Austinotheres angelicus (Lockington, 1877), Los Angeles Bay and Campo El Pescador, San Felipe, Baja California, México; F, Enigmatheres canfieldi (Rathbun, 1918), Monterey, California, U.S.A.; G, Bonita mexicana Campos, 2009, Bahía Tortugas, Baja California Sur, México. A, C from Griffith (1987: fig. 8a, j); D, from Glassell (1935: plate 14, fig. 4); F, from Rathbun (1918: fig. 57); G, from Campos (2009: fig 3e). Scale bars, A, C= 0.5 mm; D–E= 1.0 mm; F= 0.57 mm; G=0.23 mm.
FIGURE 1 in On the pea crabs found in the chiton Tonicia chilensis (Frembly, 1827) (Mollusca, Polyplacophora: Chitonidae) identified as "Orthotheres sp." by Melzer & Schwabe (2008), and its reassignment to Calyptraeotheres Campos, 1990 (Crustacea: Pinnotheridae)
FIGURE 1. Third maxilliped: A, C, D, F, G, outer view; B, E, inner view. A, Calyptraeotheres granti (Fenucci, 1975), Puerto Quequén, Necochea, Buenos Aires, Argentina; B, Calyptraeotheres politus (Smith, 1870), Bahía Ancón, Perú; C, Calyptraeotheres sp., Muelle Dichato, Chile; D, Orthotheres unguifalcula (Glassell, 1936), female 4.0 x 5.0 mm, Puerto Peñasco, Sonora, México; E, Orthotheres barbatus (Desbonne, 1867), magnification 40X, Guadeloupe; F, Orthotheres strombi (Rathbun, 1905), not at scale, female 6.6 x 9.6 mm, Clearwater, Florida, U.S.A.; G, Orthotheres serrei (Rathbun, 1909), magnification 40X, Puerto Rico. A, B from Campos (1999: figs. 2b, c); C, redrawn from Melzer & Schwabe (2008: fig. 1e); D, from Campos (1989: fig. 3a); E–G, from Rathbun (1918: figs. 44a, 45 and 41 respectively). Scale bars, A= 0.43 mm; B= 0.39 mm; C= 0.10 mm.
FIGURE 3 in On the pea crabs found in the chiton Tonicia chilensis (Frembly, 1827) (Mollusca, Polyplacophora: Chitonidae) identified as "Orthotheres sp." by Melzer & Schwabe (2008), and its reassignment to Calyptraeotheres Campos, 1990 (Crustacea: Pinnotheridae)
FIGURE 3. Juvenile crab: A, B, E, Calyptraeotheres garthi (Fenucci, 1975), Gulf San Matias, North Patagonia, Argentina; C, D, Calyptraeotheres sp., Muelle Dichato, Chile. A, dorsal view; B, sternal somites and pleon; C, pleon; D, E, chelipeds. A, B, E, from Ocampo et al. (2017: figs. 1a, a´, 2a); C, D, from Melzer & Schwabe (2008 figs. 1d, f). Scale bars: A, B = 0.5 mm; C = 0.4 mm; D, E = 0.25 mm.
Figure 2 in Apocrine secretion of the egg hull in oogenesis and exclusion of sperm organelles at fertilization make reproduction in Chitonida (Mollusca) unique
Figure 2. (A) Portion of Figure 1C enlarged to show a region (boxed area) of apical bleb formation and aposome release from oocyte (O) into the forming hull (H). Scale bar = 2 µm. Inset: centriole (C) with rootlets in cytoplasm of late oocyte. Scale bar = 0.3 µm. (B) 3D image of microapocrine secretion from the oocyte (O) to the forming hull (H) created from an area similar to that in box in (A). Image was formed from 12 digitized serial sections entered into 'Reconstruct'. (C) TEM of Littorina sitkana bursa copulatrix, showing macroapocrine secretions (MS) being released from the cell surface (CS) to the lumen. Scale bar = 10 μm.
Figure 2 in Molecular phylogeny of Acanthochitonina (Mollusca: Polyplacophora: Chitonida): three new mitochondrial genomes, rearranged gene orders and systematics
Figure 2. Molecular phylogeny of Acanthochitonina. Majority-rule consensus tree from the Bayesian analysis of the multilocus nucleotide data set, which includes three mitochondrial and two nuclear markers. Additional phylogenetic results are available in the Supplemental File 2. Note the proposed taxonomic arrangements shown by vertical lines. Numbers at nodes are support values from posterior probabilities and maximum likelihood bootstrap proportions, respectively. Scale bar is in substitutions per site.
Figure 1 in Molecular phylogeny of Acanthochitonina (Mollusca: Polyplacophora: Chitonida): three new mitochondrial genomes, rearranged gene orders and systematics
Figure 1. Phylogenetic relationships and gene arrangements of available chiton mitochondrial genomes. Majority-rule consensus tree from the Bayesian analysis of the mitochondrial genome nucleotide data set (outgroup taxa is omitted for simplicity). Identical topologies were recovered from all other analyses of mitochondrial genome data sets (see main text). Numbers at nodes are posterior probabilities and maximum likelihood bootstrap proportions, respectively. Scale bar is in substitutions per site. Mitochondrial gene orders of Haliotis rubra (Gastropoda), Octopus vulgaris (Cephalopoda) and Solemya velum (Bivalvia) are shown for comparison. Genes encoded by the minus strand are underlined; rearranged genes are highlighted in red (translocations) and green (changes of coding strands).
Figure 1 in Apocrine secretion of the egg hull in oogenesis and exclusion of sperm organelles at fertilization make reproduction in Chitonida (Mollusca) unique
Figure 1. (A) Scanning electron micrograph (SEM) of oocyte type with closed hull cupules (C) found in some species of Acanthochitona and Cyanoplax. The example is Cyanoplax dentiens. Scale bar = 40 µm. (B) Transmission electron micrograph (TEM) of section of later stage oocyte (O) of A. garnoti showing characteristic form of closed cupules (C). FC, follicle cell. Scale bar = 10 µm. (C) TEM of forming hull cupule (H) of A. garnoti showing three areas of microapocrine secretion (arrows) from surface of oocyte (O). FN, follicle cell nucleus. Scale bar = 5 µm. (D) TEM of one region of microapocrine secretion release below the forming hull (H). Note elongate apical blebs (AB), like microvilli, extending from cell membrane of oocyte (O). Micro-aposomes are pinched off and released into the intercellular space, where the hull is forming. Note also: rare Golgi vesicle exocytosis (arrow). Scale bar = 1 µm. (E) TEM detail of
Figure 3 in Apocrine secretion of the egg hull in oogenesis and exclusion of sperm organelles at fertilization make reproduction in Chitonida (Mollusca) unique
Figure 3. (A) SEM of egg of Stenosemus albus exhibiting the spinous hull typical of Chitonina. Scale bar = 50 µm. (B) SEM of portion of egg of S. albus showing sperm (arrow) penetrating one of a series of pores in the hull (P) located at the bases of spines. Scale bar = 5 μm. (C) Tip of needle-like extension of sperm of S. albus, showing acrosomal vesicle (AV) and tip of nuclear filament (N). Scale bar = 0.1 µm. (D) Light micrograph (LM) taken with Nomarski optics of
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