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29 results for “Helicina”
Data from: Additive effects of pCO2 and temperature on respiration rates of the Antarctic pteropod Limacina helicina antarctica
The Antarctic pteropod, Limacina helicina antarctica, is a dominant member of the zooplankton in the Ross Sea and supports the vast diversity of marine megafauna that designates this region as an internationally protected area. Here, we observed the response of respiration rate to abiotic stressors associated with global change – environmentally relevant temperature (-0.8˚C, 4˚C) and pH treatments reflecting current-day and future modeled extremes. Sampling repeatedly over a 14-day period in laboratory experiments and using microplate respirometry techniques, we found that the metabolic rate of juvenile pteropods increased in response to high pCO2 exposure (920 µatm) at -0.8˚C, a near-ambient temperature. Similarly, metabolic rate increased when pteropods were exposed simultaneously to multiple stressors, elevated pCO2 conditions (960 µatm) and a high temperature (+4˚C). Overall, the results showed that pCO2 and temperature interact additively to affect metabolic rates in pteropods. Furthermore, we found that L. h. antarctica can tolerate acute exposure to temperatures far beyond its maximal habitat temperature. Overall, L. h. antarctica appears to be susceptible to pH and temperature stress, two abiotic stressors which are expected to be especially deleterious for ectothermic marine metazoans in polar seas.
Data from: Additive effects of pCO2 and temperature on respiration rates of the Antarctic pteropod Limacina helicina antarctica
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FIGURE 13 in Anatomy and function of the penial twin papillae system of the Helicinae (Gastropoda: Helicoidea: Helicidae) and description of two new, small Hemicycla species from the laurel forest of the Canary Islands
FIGURE 13. Hemicycla fulgida sp. nov., paratype from El Bailadero (Tenerife). A. Spermatophore in the stalk of the bursa copulatrix complex. B. An undigested part of the spermatophore. C. Dart; bd, bursa duct; c, crown; d, diverticulum; st, stalk.
FIGURE 9. Shell body whorl details. A, B in Anatomy and function of the penial twin papillae system of the Helicinae (Gastropoda: Helicoidea: Helicidae) and description of two new, small Hemicycla species from the laurel forest of the Canary Islands
FIGURE 9. Shell body whorl details. A, B. Hemicycla fulgida sp. nov., holotype. C, D. Hemicycla invernicata. E, F. Hemicycla consobrina. A, C, E, dorsal view. B, D, F, frontal view.
FIGURE 10 in Anatomy and function of the penial twin papillae system of the Helicinae (Gastropoda: Helicoidea: Helicidae) and description of two new, small Hemicycla species from the laurel forest of the Canary Islands
FIGURE 10. Shell aperture details of the Hemicycla consobrina specimen in different views (A–D), showing the "small callosity" (yellow arrows) and the form "obtusément triangulaire" described by Mousson. A. Aperture accurately in plane view.
FIGURE 11. Genital system. A in Anatomy and function of the penial twin papillae system of the Helicinae (Gastropoda: Helicoidea: Helicidae) and description of two new, small Hemicycla species from the laurel forest of the Canary Islands
FIGURE 11. Genital system. A. Hemicycla fulgida sp. nov., paratype from El Bailadero. B. Hemicycla invernicata from Montaña Cabeza de Toro. C. Hemicycla consobrina from Guamasa; ri, ring zone.
FIGURE 8. Shells from Tenerife. A in Anatomy and function of the penial twin papillae system of the Helicinae (Gastropoda: Helicoidea: Helicidae) and description of two new, small Hemicycla species from the laurel forest of the Canary Islands
FIGURE 8. Shells from Tenerife. A. Hemicycla fulgida sp. nov., holotype. B. Hemicycla invernicata from Montaña Cabeza de Toro pine forest, near Las Lagunetas (La Esperanza forests). C. Hemicycla consobrina from Las Mercedes laurel forest.
FIGURE 7 in Anatomy and function of the penial twin papillae system of the Helicinae (Gastropoda: Helicoidea: Helicidae) and description of two new, small Hemicycla species from the laurel forest of the Canary Islands
FIGURE 7. Scatter plots of some shell measurements of the species studied. 1, Hemicycla consobrina; 2, Hemicycla invernicata; 3, Hemicycla fulgida sp. nov.; 4, Hemicycla perraudierei; 5, Hemicycla laurijona sp. nov. BP, body whorl frontal perimeter; BS, body whorl frontal surface (plane view); D1, maximum shell diameter; D2, shell diameter perpendicular to D1; FP, shell frontal perimeter; FS, shell frontal surface (plane view); SH, shell height; SP, shell perimeter (dorsal plane view); SS, shell surface (dorsal plane view).
FIGURE 5. Shell body whorl details. A–C in Anatomy and function of the penial twin papillae system of the Helicinae (Gastropoda: Helicoidea: Helicidae) and description of two new, small Hemicycla species from the laurel forest of the Canary Islands
FIGURE 5. Shell body whorl details. A–C. Hemicycla laurijona sp. nov., holotype. D–F. Hemicycla perraudierei. A, D, dorsal view. B, E, frontal view. C, F, ventral view. The sells are the same as in Fig. 4.
FIGURE 4. Shells. A in Anatomy and function of the penial twin papillae system of the Helicinae (Gastropoda: Helicoidea: Helicidae) and description of two new, small Hemicycla species from the laurel forest of the Canary Islands
FIGURE 4. Shells. A. Hemicycla laurijona sp. nov., holotype. B. Hemicycla laurijona sp. nov., paratypes from Puntas Coloradas, La Gomera. C. Hemicycla perraudierei, from Las Casillas, El Hierro.
FIGURE 3. A in Anatomy and function of the penial twin papillae system of the Helicinae (Gastropoda: Helicoidea: Helicidae) and description of two new, small Hemicycla species from the laurel forest of the Canary Islands
FIGURE 3. A. Hemicycla laurijona sp. nov., paratype from Puntas Coloradas, La Gomera. B. Hemicycla fulgida sp. nov., paratype from El Bailadero, Tenerife.
FIGURE 2. Shell drawings. A in Anatomy and function of the penial twin papillae system of the Helicinae (Gastropoda: Helicoidea: Helicidae) and description of two new, small Hemicycla species from the laurel forest of the Canary Islands
FIGURE 2. Shell drawings. A. Hemicycla laurijona sp. nov. holotype. B. Hemicycla fulgida sp. nov., holotype showing the placement of the measurements obtained. BH, body whorl height (at columella level); BP, body whorl frontal perimeter; BS, body whorl frontal surface (plane view); D1, maximum shell diameter; D2, shell diameter perpendicular to D1; FP, shell frontal perimeter; FS, shell frontal surface (plane view); SH, shell height; SP, shell perimeter (dorsal plane view); SS, shell surface (dorsal plane view).
FIGURE 1 in Anatomy and function of the penial twin papillae system of the Helicinae (Gastropoda: Helicoidea: Helicidae) and description of two new, small Hemicycla species from the laurel forest of the Canary Islands
FIGURE 1. Geographical distribution of Hemicycla laurijona sp. nov. and Hemicycla fulgida sp. nov. The blue arrow indicates approximately the area of the Hemicycla invernicata type locality. Symbols represent 1 x 1 km UTM squares.
FIGURE 2 in Clarification of the identity of Helicina mediana Gassies, 1870 from New Caledonia (Gastropoda, Neritimorpha, Helicinidae)
FIGURE 2. Paralectotype of Helicina mediana, NHM 1883.11.10.950, height 3.3 mm, greatest diameter 4.3 mm; 8x enlarged.
FIGURE 3 in Clarification of the identity of Helicina mediana Gassies, 1870 from New Caledonia (Gastropoda, Neritimorpha, Helicinidae)
FIGURE 3. Shell surface structure of Helicina mediana with oblique converging lines, NHM 1883.11.10.949 (left) and NHM 1883.11.10.950 (right).
FIGURE 6. Esophagus and head capsule. A–C, F. Zabythocypris helicina. A–C, specimen 699M in Flapper Valve and Hayfork: Functional anatomy and taxonomic potential of the Gastric Mill of Bairdioidea (Ostracoda, Podocopida)
FIGURE 6. Esophagus and head capsule. A–C, F. Zabythocypris helicina. A–C, specimen 699M; F, specimen 885M. D, Neonesidea tenera, specimen 3892F. E, Bythocypris promoza, specimen 886M. Scale bar = 50 µm.
Shell lengths of pteropod, Limacina helicina antarctica, collected from the PAL LTER sediment trap along the Western Antarctic Peninsula, 2004 - 2018, and from net tows 2017-2018.
Pteropod, Limacina helicina antarctica, is an abundant zooplankton along the Western Antarctic Peninsula (WAP) and prey for higher trophic organisms. Changes in the pteropod (pelagic snail) phenology (life history) have important implications for regional food web dynamics. Pteropod shell lengths were collected from the PAL LTER sediment trap located along the northern continental shelf of the PAL LTER sampling grid, 2004-2018. PAL LTER has deployed a time-series trap near 64.5° S, 66.0° W since late 1992. The trap is moored in 300 m depth and collects sinking particles at 170 m. Pteropod samples are stored in 21 sample collection bottles on the sediment trap that were prepared with a Milli-Q deionized water rinse and filled with 7.5 g NaCl l-1 solution and 2% borate-buffered formalin in filtered seawater (34 ppt), with a final salinity concentration of 41 ppt. L. h. antarctica shell lengths also collected during the PAL LTER 2018 January offshore cruise and for four months at Palmer Station, Anvers Island (November 2017 to February 2018). L. h. antarctica and all other macrozooplankton collection on the PAL LTER cruise are performed with a 2 m square frame Metro net (700 µm mesh), towed obliquely to a depth of 120 m. At Palmer Station, pteropods are collected with a 1 m x 1 m square frame Metro net (700 µm mesh) and a 1 m diameter ring net (200 or 500 µm mesh), towed obliquely to a depth of ~50 m. Shell lengths are determined by measuring from the opening of the shell aperture directly across the diameter of the shell. The shell lengths analyzed within the WAP region are used to determine phenology patterns in pteropod population dynamics and changes thereof over time.
FIGURE 1 in Clarification of the identity of Helicina mediana Gassies, 1870 from New Caledonia (Gastropoda, Neritimorpha, Helicinidae)
FIGURE 1. Lectotype of Helicina mediana, NHM 1883.11.10.949, height 3.7 mm; 8x enlarged.
FIGURE 4 in Clarification of the identity of Helicina mediana Gassies, 1870 from New Caledonia (Gastropoda, Neritimorpha, Helicinidae)
FIGURE 4. Original labels of the type lot of Helicina mediana, NHM 1883.11.10.949–952.
Figure 1 from: Korábek O, Petrusek A, Rovatsos M (2019) The complete mitogenome of Helix pomatia and the basal phylogeny of Helicinae (Gastropoda, Stylommatophora, Helicidae). ZooKeys 827: 19-30. https://doi.org/10.3897/zookeys.827.33057
Figure 1 The inferred phylogenetic relationships between the five helicid mitogenomes available. Branch supports are given for maximum likelihood analyses based on nucleotide data, amino acid data under homogeneous model, and amino acid data under site-heterogeneous model (in this order). The latter was run under alternative settings, see details in the text. Shimodaira–Hasegawa-like approximate likelihood ratio test (SH-aLRT) and standard bootstrap percentages (BP) are reported. Values of SH-aLRT >90 % and BP >75 % are considered positive support. Cylindrus is included as an outgroup.
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