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482 results for “Chiton”
Fig. 5 in Boreochiton jakovlevae sp. nov. (Mollusca: Polyplacophora), a new chiton from the Sea of Okhotsk
Fig. 5. Boreochiton jakovlevae sp. nov., the holotype (ZISP no. 1916), BL 27.0 mm (A–E, I), a paratype (ZISP no. 2270), BL 14 mm (H), a paratype (ZISP no. 2270), BL 25 mm (F, J, K) and a paratype (ZISP no. 2268), BL 3.5 mm (G). A – dorsal bristle; B – dorsal spicules; C – marginal needles; D – ventral spicule near outer margin; E – ventral spicules in middle part of girdle; F – half row of radula; G–I – head of major lateral tooth of radula; J, K – major uncinal tooth. Scale bar 100 µm.
Рис. 7. Таблица с рисунками моллюсков иЗ монографии Л.И. Шренка (1867): хитоны (таблица 13). Fig. 7. A plate with molluscan drawings from L. von Schrenck's monograph (1867): chitons (Tafel XIII). in Leopold von Schrenck and his contribution to malacology: on the 190 birthday
Рис. 7. Таблица с рисунками моллюсков иЗ монографии Л.И. Шренка (1867): хитоны (таблица 13). Fig. 7. A plate with molluscan drawings from L. von Schrenck's monograph (1867): chitons (Tafel XIII).
FIGURE 4. Leptochiton lignatilis n in A new Miocene deep-sea chiton and early evidence for Teredinidae-sustained wood-fall communities
FIGURE 4. Leptochiton lignatilis n. sp., from the Miocene (Langhian) of Moncasale di Casina (Reggio Emilia, N Italy). 1. Paratype MZPD MAL-2077, dorsal view of a fragment of an intermediate valve. 2. Close-up of the specimen as in Figure 4.1 showing granules.
FIGURE 3. Leptochiton lignatilis n in A new Miocene deep-sea chiton and early evidence for Teredinidae-sustained wood-fall communities
FIGURE 3. Leptochiton lignatilis n. sp., from the Miocene (Tortonian) of Torrente Cinghio (Parma, N Italy, type locality). 1-2. Paratype MZB 32033, intermediate valve in dorsal (1) and profile view (2). 3-4. Paratype NHMW 2014/0451/ 0001, fragment of a tail valve showing apophysis (ap in 3) and close-up (white rectangle in 3) showing variation in granule shape (4) from circular (white triangles) to elongate (black triangles). 5-8. Paratype MZPD MAL-2076, detail of a fragment of an intermediate valve showing granule arrangement (5, 7) and macro and microaesthetes (6, 8).
FIGURE 2. Leptochiton lignatilis n in A new Miocene deep-sea chiton and early evidence for Teredinidae-sustained wood-fall communities
FIGURE 2. Leptochiton lignatilis n. sp. from the Miocene (Tortonian) of Torrente Cinghio (Parma, N Italy, type locality). 1-4. Holotype, tail valve MGPT-PU 108787 in dorsal (1), ventral (2) and lateral (3) views, and close up (white rectangle in 1) showing sculpture (4). 5. Paratype NHMW 2014/0451/0002, tail valve with a more protruding mucro. 6-7. Paratype MGPT-PU 108788, head valve in dorsal view (6) and close up (white rectangle in 6) showing sculpture (7). 8-9. Paratype MZPD MAL-2074, intermediate valve in dorsal view (8) and close up (white rectangle in 8) showing granules with aesthetes (9).
FIGURE 1 in A new Miocene deep-sea chiton and early evidence for Teredinidae-sustained wood-fall communities
FIGURE 1. Location of the study area and of the Torrente Cinghio and Moncasale sites (asterisks) in the structural map (1) of northern Italy (modified from Scrocca et al., 2003) and in their respective geological setting (2-3) as modified from Papani (2002) and Di Dio and Zanzucchi (2005).
Fig. 5 in Taxonomic notes on chitons. On some species of Chaetopleura from South Africa (Mollusca: Polyplacophora: Ischnochitonidae)
Fig. 5. Chaetopleura debruini (Strack, 1996), dorsal view of two specimens from Algoa Bay (ZSM Mol 20041059), anterior at top. Scale bar = 5 mm.
Fig. 3 in Taxonomic notes on chitons. On some species of Chaetopleura from South Africa (Mollusca: Polyplacophora: Ischnochitonidae)
Fig. 3. Chaetopleura papilio (Spengler, 1797), isolated valves of the holotype of Chaetopleura destituta Sykes, 1902 (BMNH 1902.II.7.8): (A) dorsal view of the head valve, (B) ventral view of the head valve, (C) dorsal view of the tail valve, (D) ventral view of the tail valve. Anterior of all valves at top. Scale bars = 1 mm.
Fig. 1 in Taxonomic notes on chitons. On some species of Chaetopleura from South Africa (Mollusca: Polyplacophora: Ischnochitonidae)
Fig. 1. Chaetopleura pertusa (Reeve, 1847), isolated valves of the probable holotype (BMNH 20010486): (A) dorsal view of the head valve, (B) dorsal view of the tail valve, (C) dorsal view of valve ii. Anterior of all valves at top. Scale bar = 2 mm.
Fig. 4 in Taxonomic notes on chitons. On some species of Chaetopleura from South Africa (Mollusca: Polyplacophora: Ischnochitonidae)
Fig. 4. Chaetopleura papilio (Spengler, 1797), dorsal view of valve vi of the holotype of Chaetopleura destituta Sykes, 1902 (BMNH 1902.II.7.8), anterior at top. Scale bar = 1 mm.
Fig. 9 in Chitons (Mollusca, Polyplacophora) from São Tomé and Príncipe Islands
Fig. 9. (A–B) Stenoplax hernandezi sp. n., São Tomé Island: (A) ST06, Holotype, length 7.6 mm, MZB 49751, (B) ST03, length 8 mm, specimen disarticulated for SEM analysis; (C–E) Callochiton saotomensis sp. n., São Tomé Island: (C) ST03, Holotype, length 4.6 mm, MZB 49761, (D) ST06, length 4.9 mm, Paratype NHMUK, (E) ST06, length 4.4 mm, Paratype ZISP 2198; (F–G) Chiton lyratus Sowerby, 1840, NHMUK 1979176, two Syntypes, type locality: unknown (restricted to Príncipe Island); (H–J) Chiton canariensis d'Orbigny, 1839, NHMUK 1854.9.28.152, three Syntypes, type locality: Canary Islands; (K–N) Rhyssoplax canariensis (d'Orbigny, 1839), colour variations, (K) ST03, length 20.5 mm, (L) ST02, length 8 mm, (M) ST03, length 13.2 mm, (N) ST02, length 8.8 mm; (O) Acanthochitona crinita (Pennant, 1777), São Tomé Island, ST06, length 6.5 mm; (P–S) Craspedochiton foresti (Leloup, 1965), São Tomé Island, ST03, (P–Q) length 16 mm, dorsal and ventral views, (R–S) length 10 mm, dorsal and lateral views.
Fig. 7 in Chitons (Mollusca, Polyplacophora) from São Tomé and Príncipe Islands
Fig. 7. (A–T) Craspedochiton foresti (Leloup, 1965), São Tomé Island, ST03, specimen disarticulated and coated for SEM analysis, MZB 49763: (A–C) head valve, (A–B) dorsal and ventral views, (C) detail of the sculpture, (D–H) intermediate valve, (D–F) dorsal, frontal, and ventral views, (G–H) detail of the sculpture in different views, (I–L) tail valve, dorsal, ventral, lateral, and frontal-lateral views, (M–P) girdle formations, (M) dorsal scales, in situ, (N) detail of a dorsal scale, (O) tuft of spines, (P) ventral scales, (Q–T) radula, (Q–R) detail of central and first two lateral teeth, (S) the same, lateral view, (T) detail of the minute granulations present on the upper surface of the cusps. Scale bars = 1 mm (A, B, D, E, F, I, J); 800 μm (K, L); 300 μm (C, G); 200 μm (H); 60 μm (O, Q); 40 μm (R, S); 20 μm (M, P); 8 μm (T); 6 μm (N).
Fig. 6 in Chitons (Mollusca, Polyplacophora) from São Tomé and Príncipe Islands
Fig. 6. (A–F) Lepidochitona rolani Kaas & Strack, 1986, São Tomé and Príncipe Islands: (A) complete specimen from ST06, (B–D) PR07, intermediate valve, (B–C) dorsal and frontal views, (D) detail of the sculpture, (E–F) ST11, tail valve, (E) dorsal view, (F) detail of the sculpture; (G–L) Acanthochitona crinita (Pennant, 1777), São Tomé Island, ST03, intermediate valve: (G–I) dorsal, lateral and frontal views, (J) detail of the sculpture, (K–L) detail of granules in different views. Scale bars = 1 mm (A, B, E); 800 μm (G, I); 600 μm (H); 200 μm (F); 100 μm (D, J); 80 μm (L); 60 μm (K).
Fig. 3 in Chitons (Mollusca, Polyplacophora) from São Tomé and Príncipe Islands
Fig. 3. (A–U) Stenoplax hernandezi sp. n., São Tomé Island: (A–E), (P–Q), (T–U) specimen from ST10 (ZSM Mol-20034150), length 5.7 mm, disarticulated and coated for SEM analysis, (A–B) dorsal and frontal views, (C) detail of the head valve, (D) detail of the sculpture of an intermediate valve, (E) detail of the tail valve, (P–Q) girdle formations in situ, (T–U) radula, (T) complete view, (U) detail of major lateral tooth; (F–O), (R–S) paratype MZB 49752, specimen from ST06, length 6.8 mm, disarticulated and coated for SEM analysis, (F–H) disarticulated head valve, (F–G) dorsal and ventral views, (H) detail of the sculpture, (I–K) disarticulated intermediate valve, dorsal, ventral and frontal views, (L–O) disarticulated tail valve, (L–N) dorsal, lateral and ventral views, (O) detail of the sculpture, (R–S) detail of girdle formations, (R) ventral spicules, (S) dorsal scales. Scale bars = 1 mm (A, B); 800 μm (C, E, I, L); 600 μm (F, G, J, K, M, N); 100 μm (D); 80 μm (O, Q); 60 μm (H, T); 40 μm (P); 30 μm (R, S, U).
Fig. 5 in Chitons (Mollusca, Polyplacophora) from São Tomé and Príncipe Islands
Fig. 5. (A–S) Callochiton saotomensis sp. n., São Tomé Island, ST06, specimen disarticulated and coated for SEM analysis, MZB 49762: (A–C) head valve, (A) dorsal view, (B) detail of the sculpture, (C) ventral view, (D–I) intermediate valve, (D–F) dorsal, ventral, and lateral views, (G–I) detail of the sculpture, (J–M) tail valve, (J–K) dorsal and lateral views, (L) detail of the sculpture, (M) ventral view, (N–P) girdle formations, (N–O) dorsal spicules, (P) ventral spicules, (Q–S) radula, (Q) complete view, (R) detail of central and first two lateral teeth, (S) detail of cusp of major lateral tooth. Scale bars = 400 μm (D–F); 300 μm (C, J, M); 200 μm (A, K, Q); 80 μm (P); 50 μm (G, L, N); 40 μm (I); 30 μm (B, R); 20 μm (H, O); 10 μm (S).
Fig. 4 in Chitons (Mollusca, Polyplacophora) from São Tomé and Príncipe Islands
Fig. 4. (A–L) Chaetopleura caboverdensis (Kaas & Strack, 1986): (A–I) São Tomé Island, ST03, (A–C) head valve, (A–B) dorsal and lateral views, (C) detail of the sculpture, (D–F) intermediate valve, dorsal, lateral and frontal views, (G–I) tail valve, (G–H) dorsal and lateral views, (I) detail of the sculpture; (J–L) Cape Verde Archipelago, São Vicente, Praia da Matiota, BD 2919: (J) complete specimen, (K) detail of the sculpture of the head valve, (L) detail of the sculpture of the tail valve. Scale bars = 1 mm (J); 500 μm (A, D, F); 400 μm (G); 300 μm (H); 200 μm (B, E); 50 μm (K, L); 40 μm (C); 30 μm (I).
Fig. 2 in Chitons (Mollusca, Polyplacophora) from São Tomé and Príncipe Islands
Fig. 2. (A–D) Leptochiton denhartogi Strack, 2003, São Tomé Island, ST03, intermediate valve: (A–B) dorsal and frontal views, (C–D) detail of the sculpture of the tegmentum, close-ups of granules with aesthetes in different views; (E–H) Leptochiton sp., São Tomé Island, ST11, tail valve: (E–F) dorsal and lateral views, (G–H) detail of the sculpture of antemucronal and postmucronal areas, respectively; (I–K) Ischnochiton cf. rissoi (Payraudeau, 1826), São Tomé Island, specimen from ST06: (I) dorsal view, (J) dorsal girdle scales, (K) detail of the intermediate and tail valves; (L–Q) Ischnochiton sp., São Tomé Island, specimen from ST06: (L–M) dorsal and lateral views, (N) detail of the head and the first intermediate valves, (O–P) detail of the sculpture of central and lateral areas, respectively, (Q) dorsal girdle scales. Scale bars = 1 mm (B); 800 μm (I); 600 μm (A); 500 μm (E); 400 μm (L, M); 300 μm (F, K); 200 μm (N); 100 μm (J); 60 μm (G, H); 50 μm (D); 40 μm (C); 30 μm (P); 20 μm (O, Q).
Fig. 8 in Chitons (Mollusca, Polyplacophora) from São Tomé and Príncipe Islands
Fig. 8. (A–F) Craspedochiton productus (Carpenter in Pilsbry, 1892) from South Africa (NSMT-Mo 72867), specimen disarticulated: (A–B) head valve, width 11.2 mm, dorsal and ventral views, (C–D) intermediate valve, width 13.1 mm, dorsal and ventral views, (E–F) tail valve, width 9.1 mm, dorsal and ventral views; (G–J) Notoplax sp., São Tomé Island, ST03, intermediate valve: (G–I) dorsal, frontal, and ventral views, (J) detail of the sculpture. Scale bars = 800 μm (G); 600 μm (H); 500 μm (I); 80 μm (J).
Fig. 2 in Intertidal chitons (Mollusca: Polyplacophora) from southern Madagascar
Fig. 2. Ischnochiton sirenkoi sp. n., paratype, MZB 45695: (A–E) head valve, (A–C) dorsal, lateral and ventral views, (D) detail of the sculpture, (E) detail of teeth and slit rays of the articulamentum; (F–J) intermediate valve: (F–H) dorsal, frontal and ventral views, (I) detail of the sculpture of the tegmentum, (J) pustules with aesthetes, in pleural area; (K–P) tail valve: (K–M) dorsal, lateral and ventral views, (N) detail of the sculpture of the tegmentum, at the contact between postmucronal (at the left) and antemucronal areas, (O) detail of the sculpture of the tegmentum of postmucronal area, (P) pustules with aesthetes, in postmucronal area; (Q–T) girdle elements: (Q, R) dorsal scales, (S, T) ventral scales (note the small holes on the surface); (U–W) radula: (U) complete view, (V) detail of an half row of teeth, (W) bicuspid head of the major lateral tooth (note the minute granulations present on the upper surface of the cusps). Scale bars 1 mm (A–C, F–H, K–M), 500 μm (I), 100 μm (D, E, N, O, U), 50 μm (J, P–S) and 10 μm (T).
Fig. 4 in Intertidal chitons (Mollusca: Polyplacophora) from southern Madagascar
Fig. 4. (A, B) Ischnochiton sirenkoi sp. n., Lavanono, Madagascar: (A) holotype MZB 45693, 12.2 ×6.1 mm; (B) a lot of specimens showing colour variations, length, from left to right, respectively 17.7, 11.3, 11.2, 12, 10 and 9.5 mm; (C) Ischnochiton sansibarensis Thiele, 1909, holotype ZMB 102069, Zanzibar, ca 4 mm; (D–F) Callistochiton ashbyi (Barnard, 1963): (D) Lavanono, Madagascar, specimen n. 2 (Table 1), 23.3 mm; (E, F) holotype SAMC-A9337, an intermediate valve from Cape Infanta, South Africa, dorsal and ventral views, 9×3.3 mm; (G) Callistochiton madagassicus Thiele, 1909, holotype MNHN, Madagascar, 21×14 mm (from original description), some detached valves at left; (H) Chaetopleura chelazziana Ferreira, 1983, Lavanono, Madagascar, 47×31 mm; (I–X) Cryptoplax dupuisi Ashby, 1931, Lavanono, Madagascar: (I–K) specimens with the girdle deprived of dorsal spicules on the first four valves; (I, J) adult specimen, 51×12.5 mm; (K) the smaller specimen, 28.5×4 mm; (L) specimen with the girdle completely covered of dorsal spicules, 44×10 mm; (M, N) detail of sculpture of valves i–ii, in situ; (O, P) tail valve, lateral and ventral views, length 6.8 mm; (Q–X) valves i–viii (same scale), width (plates, without apophyses), from left to right, 4.4 mm (i), 3.9 mm (ii), 1.45 mm (iii), 2.65 mm (iv), 1.45 mm (v), 1.45 mm (vi), 2.4 mm (vii), 2.75 mm (viii).
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