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New and interesting Luticola species (Bacillariophyta) from the mangroves of Nosy Be Island, NW Madagascar

Małgorzata Bąk
Małgorzata Bąk
, 
Adrian Kryk
Adrian Kryk
, 
Łukasz Peszek
Łukasz Peszek
, 
John P. Kociolek
John P. Kociolek
, 
John Bemiasa
John Bemiasa
 et 
Etienne Bemanaja
Etienne Bemanaja
   | 14 mars 2019
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Article Category: Original research paper
Publié en ligne: 14 mars 2019
Pages: 13 - 22
Reçu: 01 mars 2018
Accepté: 10 juil. 2018
DOI: https://doi.org/10.1515/ohs-2019-0002
© 2019 Faculty of Oceanography and Geography, University of Gdańsk, Poland
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1

Nosy Be Island with the diatom sampling site (NB 4a)
Nosy Be Island with the diatom sampling site (NB 4a)

Figure 2a–am

Luticola nosybeana sp. nov. LM images. Valve views, showing variation in size and outline. Fig. 2p presents the holotype. Scale bar = 10 µm
Luticola nosybeana sp. nov. LM images. Valve views, showing variation in size and outline. Fig. 2p presents the holotype. Scale bar = 10 µm

Figure 3a–f

Luticola nosybeana sp. nov. SEM images. External valve views. Figs 3a–d: whole valve with straight axial area, expanded at the center to form a wide, asymmetrical, deltoid or rectangular fascia and isolated pore opening (arrow in Fig. 3b). Fig. 3e: proximal raphe endings, hooked to the side opposite the isolated pore, continuing with irregular, shallow, T-shaped or L-shaped grooves. Note the presence of a few slit-like or elliptic irregular surface depressions (“ghost areolae”) within the central area (arrow). Fig. 3f: distal raphe end curved and not extending onto the mantle
Luticola nosybeana sp. nov. SEM images. External valve views. Figs 3a–d: whole valve with straight axial area, expanded at the center to form a wide, asymmetrical, deltoid or rectangular fascia and isolated pore opening (arrow in Fig. 3b). Fig. 3e: proximal raphe endings, hooked to the side opposite the isolated pore, continuing with irregular, shallow, T-shaped or L-shaped grooves. Note the presence of a few slit-like or elliptic irregular surface depressions (“ghost areolae”) within the central area (arrow). Fig. 3f: distal raphe end curved and not extending onto the mantle

Figure 4a–f

Luticola nosybeana sp. nov. SEM images. Internal valve views. Figs 4a, 4b, 4d: whole valve views with the marginal canal and isolated pore. Fig. 4c: distal raphe branch terminating in small helictoglossa (arrow). Fig. 4e: close-up of the valve interior showing the hymenate occlusions of areolae (arrow) and the marginal narrow channel, located at the valve face/mantle junction (arrowhead). Fig. 4f: central area with a small, round isolated pore opening covered by large, triangular structure (arrow)
Luticola nosybeana sp. nov. SEM images. Internal valve views. Figs 4a, 4b, 4d: whole valve views with the marginal canal and isolated pore. Fig. 4c: distal raphe branch terminating in small helictoglossa (arrow). Fig. 4e: close-up of the valve interior showing the hymenate occlusions of areolae (arrow) and the marginal narrow channel, located at the valve face/mantle junction (arrowhead). Fig. 4f: central area with a small, round isolated pore opening covered by large, triangular structure (arrow)

Figure 5a–p

Luticola madagascarensis sp. nov. LM images. Valve views, showing size diminution series. Fig. 5f presents the holotype. Scale bar = 10 µm
Luticola madagascarensis sp. nov. LM images. Valve views, showing size diminution series. Fig. 5f presents the holotype. Scale bar = 10 µm

Figure 6a–f

Luticola madagascarensis sp. nov. SEM external valve views. Figs 6a, 6b, 6d: entire valve showing a narrow axial area expanded at the center to form a wide symmetrical, bow-tie shaped fascia on both valve margins. A single isolated pore (arrow in Fig. 6a) is present. Figs 6c, 6f: distal raphe fissures hooked on the same side, extending to the valve mantle. Fig. 6e: proximal raphe endings hooked to the opposite side of the isolated pore, continuing with irregular, shallow, elongated, L-shaped grooves (arrow)
Luticola madagascarensis sp. nov. SEM external valve views. Figs 6a, 6b, 6d: entire valve showing a narrow axial area expanded at the center to form a wide symmetrical, bow-tie shaped fascia on both valve margins. A single isolated pore (arrow in Fig. 6a) is present. Figs 6c, 6f: distal raphe fissures hooked on the same side, extending to the valve mantle. Fig. 6e: proximal raphe endings hooked to the opposite side of the isolated pore, continuing with irregular, shallow, elongated, L-shaped grooves (arrow)

Luticola species reported from the region in the vicinity of Madagascar

Species Source Region Comments
L. rhombica (S.J.C.Zimmermann) Levkov, Metzelti n & A.Pavlov 2013: 208 Tanzania Coll. F. Fricke
L. frickei Levkov, Metzeltin & A.Pavlov 2013: 114 Tanzania Coll. F. Fricke
L. gesierichiae Levkov, Metzeltin & A.Pavlov 2013: 119 Tanzania Coll. F. Fricke
L. hustedti i Levkov, Metzeltin & A.Pavlov 2013: 131 Tanzania Coll. Leg. B. Schröder
L. kraeuselii (Cholnoky) Metzeltin & Lange-Bertalot 1998: 139 South Africa Acc. No. MKNDC 6283
L. disti nguenda (Hustedt) Levkov, Metzelti n & A. Pavlov 2013: 106 South Africa Acc. No. MKNDC 6396
L. tropica Levkov, Metzeltin & A.Pavlov 2013: 241 South Africa, Indonesia –
L. novaeguineaensis (Tempère) Levkov, Metzelti n & A.Pavlov 2013: 177 New Guinea, Sumatra Coll. Adams

Physicochemical parameters of water recorded at the study site on Nosy Be Island during sampling

Temp. °C pH ORP mV DO mg l−1 0% TDS mg l−1 Salinity PSU Atm. pressure mbar
32.4 6.9 −104 6.6 76 44 15.3 1016.5
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