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Navicula dermochelycola sp. nov., presumably an exclusively epizoic diatom on sea turtles Dermochelys coriacea and Lepidochelys olivacea from French Guiana Cover

Navicula dermochelycola sp. nov., presumably an exclusively epizoic diatom on sea turtles Dermochelys coriacea and Lepidochelys olivacea from French Guiana

Oceanological and Hydrobiological Studies
Volume 49 (2020): Issue 2 (June 2020)
By:
Open Access
|Jun 2020

Figures & Tables

Figure 1a–e (LM)

Navicula dermochelycola sp. nov. Note the alternating longer and shorter striae around the central area. Scale bar = 10 μm for all images
Navicula dermochelycola sp. nov. Note the alternating longer and shorter striae around the central area. Scale bar = 10 μm for all images

Figure 2a–g (SEM)

Navicula dermochelycola sp. nov.: (a–e) External views of complete valves in valve view, with capitate apices; (f, g) Large and irregular central area with alternating longer and shorter striae (g arrowheads). Note the decussate pattern of areolae. Scale bars 4 μm (a–e); 1 μm (a, f ); 2 μm (g)
Navicula dermochelycola sp. nov.: (a–e) External views of complete valves in valve view, with capitate apices; (f, g) Large and irregular central area with alternating longer and shorter striae (g arrowheads). Note the decussate pattern of areolae. Scale bars 4 μm (a–e); 1 μm (a, f ); 2 μm (g)

Figure 3a–d (SEM)

Navicula dermochelycola sp. nov. External views: (a) Capitate apex with visible convergent striae. (b) Free open copula without ornamentation. (c) Apex with open copulae and one row of transapically-elongate and irregularly-spaced puncta (c arrowhead). Note that puncta are not present on copulae at the apex. (d) Copula (probably the valvocopula) with a row of irregular short puncta (d arrow). Scale bars: 3 μm (b); 1 μm (a); 700 nm (c); 600 nm (d)
Navicula dermochelycola sp. nov. External views: (a) Capitate apex with visible convergent striae. (b) Free open copula without ornamentation. (c) Apex with open copulae and one row of transapically-elongate and irregularly-spaced puncta (c arrowhead). Note that puncta are not present on copulae at the apex. (d) Copula (probably the valvocopula) with a row of irregular short puncta (d arrow). Scale bars: 3 μm (b); 1 μm (a); 700 nm (c); 600 nm (d)

Figure 4a–c (SEM)

Navicula dermochelycola sp. nov. Internal valve views: (a) Entire valve with strongly arched striae near the central area. (b) Helictoglossa laterally-positioned on the central rib. (c) Asymmetrical position of the proximal raphe endings on the elevated rib (c arrow). Note the ellipsoidal areolae. Scale bars: 5 μm (a); 3 μm (c); 600 nm (b)
Navicula dermochelycola sp. nov. Internal valve views: (a) Entire valve with strongly arched striae near the central area. (b) Helictoglossa laterally-positioned on the central rib. (c) Asymmetrical position of the proximal raphe endings on the elevated rib (c arrow). Note the ellipsoidal areolae. Scale bars: 5 μm (a); 3 μm (c); 600 nm (b)

Features of Navicula dermochelycola sp_ nov_ (French Guiana, Yalimapo, DC)_ Comparison with several other Navicula taxa (see text)

Navicula dermochelycola sp. nov.Navicula rostelllataNavicula capitatoradiataNavicula salinarumNavicula fucicola
n (SEM observations)21ndndndnd
Valve shapelinear elliptic with capitate apiceslinear to linear-lanceolate, strongly capitate, narrow endslanceolate, protracted and rostrate apiceselliptical-lanceolate, rostrate apiceslanceolate, rostratecapitate
Length Width L/W15–25 (19 ± 3.0) 3.7–5.0 (4 ± 0.3) 4 ± 0.832–50 8–10 nd35–40 7–8 nd30–40 9–10 nd12–22 5–7 nd
Stria density24.5–30 (28 ± 1.6)11–14 (15)12–1314–1620–24; 24–28 on apices
Areolae on the valve faceradiate to arched striae, apically elongate areolaestriae bent and radiate around the center, apically elongate areolaeradiate to arched striae, apically elongate areolaestriae arched, parallel near apicesstriae radiate to arched
Striae around the central areaalternatively short and longall of the same lengthalternatively short and longalternatively short and longof irregular length
Central areadistinct, bow-tie/butterfly like, expanded, not really asymmetricalexpanded and asymmetricalrelatively restrictedrelatively large, symmetricalsmall
Ethologyepizoic, marinefreshwater, cosmopolitanfreshwaterbrackishmarine, in the mucilage of the apical slit of Fucus vesiculosus
Referencepresent studyKützing 1844 Lange-Bertalot 2001 Potapova & Kociolek 2011Germain 1981 Rushforth & Spaulding 2010Grunow in Cleve & Grunow 1880 Patrick & Reimer 1966 Germain 1981 Kociolek 2011Taassen 1975

Sampled turtles and geographical location

oceanic basinlocationspeciesnesting or subadultjuvenilelatitudelongitude
Caribbean Sea(Marti nique)Grande Anse d'ArletCM 814°30ʹ10.95ʹʹN61°05ʹ13.01ʹʹW
Anse du Bourg d’ArletCM 2214°29ʹ13.43ʹʹN61°04ʹ58.89ʹʹW
EI 1
MacabouDC1 14°29ʹ55.06ʹ'N60°49ʹ25.42ʹʹW
Les SâlinesEI1 14°23ʹ45.55ʹʹN60°52ʹ14.74ʹʹW
Anse NoireEI 114°31ʹ42.47ʹʹN61°5ʹ20.36ʹʹW
CM 1
PrêcheurEI 114°49ʹ60ʹʹN61°12ʹ0ʹʹW
CM 1
CarbetCM 414°42ʹ0ʹʹN61°10ʹ60ʹʹW
Saint PierreCM 214°43ʹ60ʹʹN61°10ʹ60ʹʹW
EI 1
Petite Anse d’ArletCM 1ndnd
Equatorial Atlantic Ocean (French Guiana)YalimapoDC16 5°44ʹ47.96ʹʹN53°56ʹ37.36ʹʹW
CM13
AztèqueCM4 5°41ʹ12.57ʹʹN53°43ʹ49.07ʹʹW
DC1
CayenneDC3 4°55ʹ10.54ʹʹN52°16ʹ5.31ʹʹW
LO6
South Pacific Ocean (French Polynesia)Te Mana O Te Moana (Moorea)CM 217°29ʹ39.639ʹʹS149°52ʹ13.527ʹʹW
Tiaraunu (Tetiaroa)CM7 16°59ʹ21.5ʹʹS149°34ʹ48.1ʹʹW
Oroatera (Tetiaroa)CM1 16°59ʹ37.4ʹʹS149°32ʹ24.0ʹʹW
Onetahi (Tetiaroa)CM9 17°01ʹ17.9ʹʹS149°35ʹ45.2ʹʹW
TahitiEI 1ndnd
Afareaitu (Moorea)EI 217°33ʹS149°48ʹW
Nu’uroa (Moorea)CM 117°32ʹ5.793ʹʹS149°54ʹ10.325ʹʹW
Haapiti (Moorea)CM 117°33ʹ56.2ʹʹS149°52ʹ09.9ʹʹW
Atiha (Moorea)CM 117°35ʹ09.7ʹʹS149°50ʹ26.8ʹʹW
TetiaroaEI 2ndnd
LO1 ndnd
TikehauCM 115°S148° 10'W
Moorea LagoonEI 1ndnd
Maatea (Moorea)EI 117°35ʹ13.92ʹʹS149°48ʹ20.7036ʹʹW
Opunohu (Moorea)CM 117°30ʹ28.7352ʹʹS149°51ʹ23.9328ʹʹW
Temae (Moorea)CM1 ndnd
MooreaEI1 ndnd
Papetoai (Moorea)CM 1ndnd
Horoatera (Teti aroa)CM1 ndNd
DOI: https://doi.org/10.1515/ohs-2020-0012 | Journal eISSN: 1897-3191 | Journal ISSN: 1730-413X
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Language: English
Page range: 132 - 139
Submitted on: Sep 9, 2019
Accepted on: Dec 5, 2019
Published on: Jun 18, 2020
Published by: Sciendo
In partnership with: Paradigm Publishing Services
Publication frequency: 4 times per year
Keywords:
Rotifera,
eutrophic lake,
effects of Dreissena’s,
fish,
Crustacea
Related subjects:
Chemistry,
Chemistry, other,
Geosciences,
Geosciences, other,
Life sciences,
Life sciences, other

© 2020 Catherine Riaux-Gobin, Andrzej Witkowski, John Patrick Kociolek, Damien Chevallier, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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