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31 results for “stalked barnacles”
Data from: Testing adaptive hypotheses on the evolution of larval life history in acorn and stalked barnacles
Despite strong selective pressure to optimize larval life history in marine environments, there is a wide diversity with regard to developmental mode, size and time larvae spend in the plankton. In the present study, we assessed if adaptive hypotheses explain the distribution of the larval life history of thoracican barnacles within a strict phylogenetic framework. We collected environmental and larval trait data for 170 species from the literature, and utilized a complete thoracican synthesis tree to account for phylogenetic non-independence. In accordance with Thorson's rule, the fraction of species with planktonic-feeding larvae declined with water depth and increased with water temperature, while the fraction of brooding species exhibited the reverse pattern. Species with planktonic-nonfeeding larvae were overall rare, following no apparent trend. In agreement with the "size advantage" hypothesis proposed by Strathmann in 1977, egg and larval size were closely correlated. Settlement-competent cypris larvae were larger in cold water, indicative of advantages for large juveniles when growth is slowed. Planktonic larval duration, on the other hand, was uncorrelated to environmental variables. We conclude that different selective pressures appear to shape the evolution of larval life history in barnacles.
Data from: Testing adaptive hypotheses on the evolution of larval life history in acorn and stalked barnacles
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FIGURE 12 in Four new species and a new record of Cryptoniscoidea (Crustacea: Isopoda: Hemioniscidae and Crinoniscidae) parasitising stalked barnacles from New Zealand
FIGURE 12. Female and larval Scalpelloniscus vomicus sp. nov. A, host specimen Smilium zancleanum (NIWA 43461), arrow indicates gall formed by female S. vomicus; B, C, dorsal and ventral view of mature female paratype (NIWA 35033); D–I epicaridium larvae (NIWA 35053); D, lateral view of epicaridium larva; E, antenna; F, pereopod 1; G; pleopod 1, H, endopod of pleopod 1 (setation omitted); I, uropod and anal tube, not all setation shown. Scale Bars: A = 1 cm; B, C = 0.5 mm; D–I = 50 µm.
FIGURE 11 in Four new species and a new record of Cryptoniscoidea (Crustacea: Isopoda: Hemioniscidae and Crinoniscidae) parasitising stalked barnacles from New Zealand
FIGURE 11. Scanning electron micrographs of Scalpelloniscus vomicus sp. nov. paratypes (NIWA 43476). A, dorsal view; B, lateral view; C, pleotelson; D, antennule; E, pereopod 4; F, pereopod 3; G; detail of lateral teeth of antennule. Scale bars: A, B = 200 μm; C, D = 30 μm; E, F = 20 μm; G = 10 μm.
FIGURE 8 in Four new species and a new record of Cryptoniscoidea (Crustacea: Isopoda: Hemioniscidae and Crinoniscidae) parasitising stalked barnacles from New Zealand
FIGURE 8. Scalpelloniscus nieli sp. nov. A–E (B–D holotype NIWA 35060; A, E paratype NIWA 35031) male; F female (NIWA 43468) A, antennule; B, antenna; C, pereopod 4; D, pereopod 7; E, pleotelson, not all setation shown; F, female, ventral view. Cuticular striations shown are representative only. Scale bars: A–E = 50 μm, F = 1 mm.
FIGURE 7 in Four new species and a new record of Cryptoniscoidea (Crustacea: Isopoda: Hemioniscidae and Crinoniscidae) parasitising stalked barnacles from New Zealand
FIGURE 7. Female Crinoniscus politosummus sp. nov. paratypes A, 2 females in situ (NIWA 43485) B, lateral view of female paratype (NIWA 43388). Scale bars: A = 1 mm; B = 0.5 mm.
FIGURE 5 in Four new species and a new record of Cryptoniscoidea (Crustacea: Isopoda: Hemioniscidae and Crinoniscidae) parasitising stalked barnacles from New Zealand
FIGURE 5. Male Crinoniscus politosummus sp. nov., holotype (NIWA35052). A, antennule; B, antenna; C, pereopod 2; D, pereopod 5; E, pereopod 7; F, pleotelson, not all setation shown. Cuticular striations shown are representative only. Scale bar = 50 μm.
FIGURE 6 in Four new species and a new record of Cryptoniscoidea (Crustacea: Isopoda: Hemioniscidae and Crinoniscidae) parasitising stalked barnacles from New Zealand
FIGURE 6. Male Crinoniscus politosummus sp. nov. paratypes (NIWA 43479). A, dorsal view; B, lateral view; C, pleotelson; D, ventral view of anterior segments; E, antennule; F, second coxal plate; G, pereopod 2; H, pereopods 3 & 4; I, pereopod 7; J, propodus-dactylus junction pereopod 3; K, uropods, ventral view. Scale bars: A, B = 100 μm; C, D, K = 50 μm; E–I = 20 μm; J = 10 μm.
FIGURE 4 in Four new species and a new record of Cryptoniscoidea (Crustacea: Isopoda: Hemioniscidae and Crinoniscidae) parasitising stalked barnacles from New Zealand
FIGURE 4. Female Crinoniscus cephalatus sp. nov., paratypes; A, B, scanning electron micrographs of recently moulted immature female attached to host (NIWA 43478); C–E, mature female (NIWA 35029). C, D lateral and ventral view of female; E, mouthparts. Scale bars: A = 200 μm; B = 100 μm; C, 1 mm; E, 50 μm.
FIGURE 3 in Four new species and a new record of Cryptoniscoidea (Crustacea: Isopoda: Hemioniscidae and Crinoniscidae) parasitising stalked barnacles from New Zealand
FIGURE 3. Male Crinoniscus cephalatus sp. nov., paratypes (NIWA 43477). A, lateral view; B, dorsal view of same specimen; C, ventral view of anterior section; D, antennule; E, pereopod 3 & 4; F, pleopod 1; G, propodus-dactylus junction of pereopod 5; H, pleotelson. Scale bars A, B = 200 μm; C = 100 μm; D, E, H = 20 μm; F = 50 μm; G = 10μm.
FIGURE 1 in Four new species and a new record of Cryptoniscoidea (Crustacea: Isopoda: Hemioniscidae and Crinoniscidae) parasitising stalked barnacles from New Zealand
FIGURE 1. Map of New Zealand showing localities of where the current specimens of A, Crinoniscus cephalatus sp. nov. (Ο), C. politosummus sp. nov. (Π); B, Scalpelloniscus nieli sp. nov. (Ο), S. cf. penicillatus Grygier, 1981b () and S. vomicus sp. nov. (Π) were collected.
FIGURE 2 in Four new species and a new record of Cryptoniscoidea (Crustacea: Isopoda: Hemioniscidae and Crinoniscidae) parasitising stalked barnacles from New Zealand
FIGURE 2. Male Crinoniscus cephalatus sp. nov. A, B, D–F Holotype (NIWA 35048). C, paratype (NIWA 43460). A, antennule; B, antenna; C, pereopod 5; D, pereopod 7; E pleotelson; F pleopod 2. Not all setation shown in E and F. Cuticular striations shown are representative only. Scale bars: A, C–F = 50 μm, B = 100 μm.
FIGURE 9 in Two new deep-sea stalked barnacles, Arcoscalpellum epeeum sp. nov. and Gymnoscalpellum indopacificum sp. nov., from the Coral Sea, with descriptions of the penis in Gymnoscalpellum dwarf males
FIGURE 9. Gymnoscalpellum indopacificum sp. nov. Holotype. (MNHN-IU-2013-7435). A, Cirrus I. B, Serrulate setae on posterior ramus of cirrus I. C, Cirrus II. D, Intermediate segment of anterior ramus of cirrus II. E, Cirrus III. F, Intermediate segment of anterior ramus of cirrus III. G, Cirrus IV. H, Intermediate segment of anterior ramus of cirrus IV. Scale bars in µm, except A, C, E, G, in mm.
FIGURE 10 in Two new deep-sea stalked barnacles, Arcoscalpellum epeeum sp. nov. and Gymnoscalpellum indopacificum sp. nov., from the Coral Sea, with descriptions of the penis in Gymnoscalpellum dwarf males
FIGURE 10. Gymnoscalpellum indopacificum sp. nov. Holotype. (MNHN-IU-2013-7435). A, Cirrus V. B, Lesser curvature of anterior ramus of cirrus V. C, Greater curvature of anterior ramus of cirrus V showing spines. D, Cirrus VI. E, Lesser curvature of anterior ramus of cirrus V. F, Greater curvature of anterior ramus of cirrus. G, Caudal appendages. Scale bars in µm, except A, D in mm.
FIGURE 7 in Two new deep-sea stalked barnacles, Arcoscalpellum epeeum sp. nov. and Gymnoscalpellum indopacificum sp. nov., from the Coral Sea, with descriptions of the penis in Gymnoscalpellum dwarf males
FIGURE 7. Gymnoscalpellum indopacificum sp. nov. Holotype (MNHN-IU-2013-7435). A, External lateral view of capitulum, showing partially calcified capitular plates. B, Schematic drawing of lateral view of capitulum. Morphological terms of capitular plates, refer to Fig. 2.
FIGURE 11 in Two new deep-sea stalked barnacles, Arcoscalpellum epeeum sp. nov. and Gymnoscalpellum indopacificum sp. nov., from the Coral Sea, with descriptions of the penis in Gymnoscalpellum dwarf males
FIGURE 11. Gymnoscalpellum indopacificum sp. nov. Holotype. (MNHN-IU-2013-7435). Dwarf males. A, Rostral view of capitulum showing paired receptacles (circled), located on inner edge of scutum. B, Lateral view, somatic body and adductor muscle removed, showing receptacles. C, Magnified view of receptacle, showing embedded dwarf males. Note dwarf males with 4 shell plates, surrounding central aperture. D, Dwarf male observed using compound light microscope, showing extended penis. E, External surface of dwarf males, showing fan-shaped denticles. Scale bars in µm, except A–C in mm. Pl - shell plates, ap - aperture.
FIGURE 8 in Two new deep-sea stalked barnacles, Arcoscalpellum epeeum sp. nov. and Gymnoscalpellum indopacificum sp. nov., from the Coral Sea, with descriptions of the penis in Gymnoscalpellum dwarf males
FIGURE 8. Gymnoscalpellum indopacificum sp. nov. Holotype. (MNHN-IU-2013-7435). A, Maxilla. B, Maxillule. C, Magnified view of cutting edge of maxillule. D, Mandible. E, Mandibulatory palp. F, Magnified view of mandibulatory palp. Scale bars in µm.
FIGURE 6 in Two new deep-sea stalked barnacles, Arcoscalpellum epeeum sp. nov. and Gymnoscalpellum indopacificum sp. nov., from the Coral Sea, with descriptions of the penis in Gymnoscalpellum dwarf males
FIGURE 6. Arcoscalpellum epeeum sp. nov. Paratypes (MNHN-IU-2013-8584). Stn. DW1734. – Showing ontogenetic variation in shape and size of carina.
FIGURE 5 in Two new deep-sea stalked barnacles, Arcoscalpellum epeeum sp. nov. and Gymnoscalpellum indopacificum sp. nov., from the Coral Sea, with descriptions of the penis in Gymnoscalpellum dwarf males
FIGURE 5. Arcoscalpellum epeeum sp. nov. Holotype (MNHN-IU-2013-7431). A, Cirrus V. B, Serrulate setae on posterior ramus of cirrus V. C, Cirrus VI. D, Intermediate segment of anterior ramus of cirrus VI. E, Caudal appendages observed under stereomicroscope. F, Caudal appendage observed under light microscope, showing setae at tip. G, Dwarf males, showing antennules. H, Surface of dwarf males showing fan-shaped denticles. Scale bars in µm.
FIGURE 4 in Two new deep-sea stalked barnacles, Arcoscalpellum epeeum sp. nov. and Gymnoscalpellum indopacificum sp. nov., from the Coral Sea, with descriptions of the penis in Gymnoscalpellum dwarf males
FIGURE 4. Arcoscalpellum epeeum sp. nov. Holotype (MNHN-IU-2013-7431). A, Cirrus I. B, Serrulate setae on posterior ramus of cirrus I. C, Cirrus II. D, Intermediate segment of anterior ramus of cirrus II. E, Cirrus III. F, Intermediate segment of anterior ramus of cirrus III. G, Cirrus IV. H, Intermediate segment of anterior ramus of cirrus II. Scale bars in µm.
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