124,918 research outputs found
Cryptomonas indica Gusev, B. Karthick, Martynenko, Shkurina et Kulikovskiy 2021, sp. nov.
No full textCryptomonas indica Gusev, B. Karthick, Martynenko, Shkurina et Kulikovskiy sp. nov. Fig. 2.Published as part of Gusev, Evgeniy, Karthick, Balasubramanian, Martynenko, Nikita, Shkurina, Nataliya & Kulikovskiy, Maxim, 2021, Cryptomonas indica sp. nov. (Cryptophyceae: Cryptomonadales), a new species described from the Western Ghats, India, pp. 261-270 in Phytotaxa 518 (4) on page 264, DOI: 10.11646/phytotaxa.518.4.3, http://zenodo.org/record/549696
Urosolenia extensa Karthick & Kociolek 2011, sp. nov.
No full text<i>Urosolenia extensa</i> Karthick & Kociolek, <i>sp. nov.</i> (Figs 7–8, holotype illustrated in Fig. 7–A) <p> <i>Frustula cylindrica. Valvae symmertica conicae, angustatis longissimis, rectis ad undulates. Processus positatus ad centrum valvae, extense ramo-simili visibili LM. Latitudo frustuli 3.2–5.1 µm. Longitudo processes 15.4–44.4 µm. Copulae 5–7/ 10 µm.</i></p> <p>Frustules cylindrical. Valves symmetrical, conical, continuing in a very long straight to slightly undulated process. Process positioned on valve center. Process possessing branch-like extension visible in LM. Frustules width 3.2–5.1 µm, length of process 15.4–44.4 µm, copulae density 5–7/ 10 µm.</p> <p> <b>Type:</b> Hirebhaskar Dam (14°05’48” N, 74°53’30”E, altitude 552 meters above sea level), Sharavathi River, Shimoga District, Karnataka, India. Collected by <i>H P Gandhi</i> on 11 th January 1955. (Sample No. Sr. 110 in Gandhi's collection) (holotype CESH-5-1884, Centre for Ecological Science Herbarium Diatom Collection, Indian Institute of Science, Bangalore, INDIA; isotypes BM 101460).</p> <p> <b>Etymology:</b> Named for the elongated process of the valve.</p> <p>In the SEM, the calyptra is funnel-shaped, tapered to form a tubular, extended process (Figs 8–A, B). Striae of the calyptra are in linear rows (Figs 8–A, G). The linearly arranged striae can be interrupted by elongated, narrowly rectangular openings (Figs 8–B, E). The elongated girdle consists of imbricate broad half bands, each isolated by a rim-like structure. Regularly distributed elongated areolae are present on the girdle (Fig 8– C, D). The base of the calyptra is a rim without additional ornamentation. The conical part of the valve has small areolae with density of 8–9/ 1 µm. The extension process possesses a small branch like projections and ends bluntly pointed (Fig 8–F).</p> <p> <i>Urosolenia extensa</i> differs from all other known <i>Urosolenia</i> species by its shape and absence of structure on valve lamina as observed in <i>U. curvata</i> and <i>U. diademata</i> Rott & Kling <i>(</i> Rott <i>et al.</i> 2006). <i>U. extensa</i> can be differentiated from the <i>U. delicatissima</i> by the absence of buttonhole shaped external labiate opening on the valve (Sala <i>et al</i>. 2008. Fig 13, 14) and the presence of branch like projections on the process (Fig 8–F).</p>Published as part of <i>Karthick, B. & Kociolek, J. P., 2011, Four new centric diatoms (Bacillariophyceae) from the Western Ghats, South India, pp. 25-40 in Phytotaxa 22 (1)</i> on pages 34-35, DOI: 10.11646/phytotaxa.22.1.2, <a href="http://zenodo.org/record/4776708">http://zenodo.org/record/4776708</a>
Pleurosira indica Karthick & Kociolek 2011, sp. nov.
No full text<i>Pleurosira indica</i> Karthick & Kociolek, <i>sp. nov.</i> (Figures 1–2; holotype illustrated in Fig. 1–B) <p> <i>Valvae circularae ad ellipticae 31.6–77.4 µm diametro. Superficies valvarum dilute hemisphaerica. Ocelli 2 raro 3, nondiligenter oppositi sibi. Rimoportulae 3–7, expansa super valvam. Sulcus circularis circa rimpoportulam. Striae radiatae 14–18/ 10 µm ad marginem. Areolae in seriebus brevibus radialibus ad marginem in parte centrali irregulariter disposita valvae, 13–18/ 10 µm. Spinulae praesentes super superficiem valvae.</i></p> <p>Valves circular to elliptical, 31.6–77.4 µm in diameter. Valve face slightly hemispherical. Ocelli 2, rarely 3, and ocelli not exactly opposite one another. Rimoportulae 3–7 spread across valve. Circular groove present around rimoportula. Striae radiate 14–18/ 10 µm at margin of valve face. Areolae in short radial rows at margin, irregularly arranged in central part of valve, density ranging from 13–18 in 10µm. Spinules present across valve face.</p> <p> <b>Type:—</b> Kodaikanal Lake (10°14’03” N, 77°29’13”E, altitude 2090 meters above sea level), Dindigul District, Tamil Nadu, Collected by <i>Dinesh Kumar,</i> 22 nd December 2008 (holotype CESH-5-1881, Centre for Ecological Science Herbarium Diatom Collection, Indian Institute of Science, Bangalore, INDIA; isotypes BM 101457).</p> <p> <b>Habitat:</b> —Sample collected from a floating aquatic plant. This species occurs in slightly acidic water (pH: 6.25±0.12) with phosphates 0.06± 0.02 mg l -1; nitrates: 0.55± 0.13 mg l -1 and dissolved oxygen 3.95± 0.55 mg l-1.</p> <p> <b>Distribution:</b> —Currently known only from the type locality.</p> <p> <b>Etymology:</b> —Named after the country name, India.</p> <p> <b>Observations:</b> —In the SEM the valve has irregular areolae that occur across the face (Figs 2–A, B, C) and extend onto the mantle (Fig. 2–E). Two, rarely three (Fig. 2–B) ocelli are present. Ocelli are ellipticalelongate in shape and the porelli that comprise the ocelli are small and radiate in their organization (Figs 2–A, B, F). Internally, ocelli appear as depressions at the valve face/mantle junction (Figs 2–C, D). Rimportulae have round openings externally (Figs 2–A, B). Internally they are elevated and lip-like (Figs 2–G, H). There is a c–shaped depression around the rimportula internally (Fig. H). The girdle is wide, and copulae possess distinct pores.</p> <p> <i>Pleurosira indica</i> differs from <i>P.laevis</i> (Ehrenb.) Compère by the presence of irregularly arranged areolae and presence of c–shaped depression around the rimoportulae. <i>Pleurosira laevis</i> (Fig. 1 in Compère 1982, Fig. 2–A in Kociolek <i>et al.</i> 1983) shows a clear pattern in areolae arrangement with striae radiating from the centre to margin and a silica surface which separate the porelli from areolae (Fig. 4 in Compère 1982) is also absent in <i>P. indica. Pleurosira indica</i> can be easily distinguished from <i>P. soctrensis</i> var. <i>pangeroni</i> Compère (Figs 33–36, 44 in Compère 1982) by valve outline and absence of a c–shaped depression around each rimportula. <i>Pleurosira soctrensis</i> var. <i>pangeroni</i> has also been reported from South India (Compère 1982). <i>Pleurosira indica</i> also differs from another Indian taxon, <i>Pleurosira socotrensis</i> var. <i>bengalensis</i> Compère (Figs 37, 38, 44 in Compère 1982), by the absence of the 6–15 labiate processes being arranged in a circular fashion.</p> <p>Order Thalassiosirales Glezer & Makarova 1986</p> <p>Family Thalassiosiraceae Lebour 1930</p> <p> Genus <i>Spicaticribra</i> Johansen, P. Kociolek & R. Lowe 2008</p>Published as part of <i>Karthick, B. & Kociolek, J. P., 2011, Four new centric diatoms (Bacillariophyceae) from the Western Ghats, South India, pp. 25-40 in Phytotaxa 22 (1)</i> on pages 27-29, DOI: 10.11646/phytotaxa.22.1.2, <a href="http://zenodo.org/record/4776708">http://zenodo.org/record/4776708</a>
Stauroneis lacuspowaiensis Wadmare & B. Karthick 2022, nom. nov., stat. nov.
No full textStauroneis lacuspowaiensis Wadmare & B.Karthick nom. nov., stat. nov. (Figs 1–18, Fig. 4 represents the lectotype) Basionym: — Stauroneis phoenicenteron f. capitata in Gonzalves & Gandhi 1953, The Journal of Indian Botanical Societ y, p. 256, fig. 92 (here reproduced as Fig. 1) Heterotypic synonym: — Stauroneis nobilis f. capitata H.Kobayasi (in Kobayasi & Ando 1977) Type:— INDIA. Mumbai (then Bombay), Maharashtra. Powai Lake pavements having encrustations with dead vegetable matter, 19°7’37.2” N, 72°54’14.4” E, Mr. H. P. Gandhi on 6 th March 1945 . Lectotype (designated here):—Agharkar Research Institute (AHMA) Gandhi Collection! Slide- Sr 5, here illustrated as Fig. 4. Description:—LM (Figs 1–8): Valves narrowly linear-lanceolate, having large, capitate apices with slight undulate sides (Fig. 5, arrow). Length 98.5–103.0 µm, breadth 16.5–18.0 µm. Axial area broad widening near centre. Stauros slightly broad, rectangular. Raphe thick with straight central raphe ends, and sickle-shaped terminal raphe fissures with bifurcation (Fig. 7, arrowhead). Striae parallel at centre and radiate towards apices, 18–23/10 µm. Areolae irregularly punctate (Fig. 4, double arrowheads), discernible in LM. (n= 21). SEM (Figs 9–18): Externally (Figs 9–14), central raphe ends terminating on stauros (Figs 9, 10, 12). Raphe filiform (Fig. 12). Terminal raphe fissures sickle-shaped, continuing onto mantle (Figs 11, 13). Striae uniseriate, composed of irregularly placed, transapically elongated, slit-like areolae (Fig. 14, double arrowheads). Internally (Figs 15–18), stauros small, thickened and elevated with tunnel gap (Figs 15, 17, arrowheads). Terminal raphe fissures terminating onto helictoglossae (Figs 15, 16, 18). Areolae rounded to transapically elongated, 16–20 in 10 µm (Fig. 17, double arrowheads). Remarks:—Valve dimensions of the specimens examined in the current study have a smaller size range than the dimensions given by H. P. Gandhi in the original description length 113.4–120.0 µm; width 21.6 µm (see Table 1). In addition, previous studies based on Gandhi’s material observed certain morphometry discrepancies (Karthick & Kociolek 2012, Kale et al. 2017). Etymology:—The specific epithet “ lacuspowaiensis ” refers to the type locality Powai Lake, Mumbai, where H. P. Gandhi originally collected the sample.Published as part of Wadmare, Neha & Karthick, Balasubramanian, 2022, Revisiting two Stauroneis Ehrenberg (Bacillariophyta) from H. P. Gandhi's Diatom collection: Notes on Ultrastructure, Types and Nomenclature, pp. 42-52 in Phytotaxa 555 (1) on page 44, DOI: 10.11646/phytotaxa.555.1.3, http://zenodo.org/record/687561
Spicaticribra kodaikanaliana Karthick & Kociolek 2011, sp. nov.
No full textSpicaticribra kodaikanaliana Karthick & Kociolek, sp. nov. (Figures 3–4; holotype is illustrated in Fig. 3–A) Frustula 8–23 µm diametro. Fultoportulae marginales 8–14 in quoque valva, 2–3µm distantes. Rimoportulae 1–3 in quoque valva, intra annulum fultoportularum. Striae radiales, rectae, aliquandro centro extensae, aliquandro prae centro terminates, 16–22 in 10 µm. Areolae 25–32 in 10µm intra strias, areolis centralibus 2-4 grandibus noncenteris. Frustules 8–23 µm in diameter. Marginal fultoportulae 8–14 per valve, with 2–3 µm between adjacent fultoportulae. Rimoportulae number 1–3 per valve with internal extensions at same height as fultoportulae. Striae radial, straight, extending from margin to center, others extending only partially to center, 16–22 in 10 µm. Areolae 25–32 in 10 µm within striae, with central areolae 2-4 times the size of other areolae. Type: — Kodaikanal Lake (10°14'03" N, 77°29'13"E, altitude 2090 meters above sea level), Dindigul District, Tamil Nadu, Collected by Dinesh Kumar, 22 nd December 2008 (holotype CESH-5-1882, Centre for Ecological Science Herbarium Diatom Collection, Indian Institute of Science, Bangalore, INDIA; isotypes BM 101458). Habitat: —Sample collected from a floating aquatic plant. This species occurs in slightly acidic water (pH: 6.25±0.12) with phosphates 0.06± 0.02 mg l -1; Nitrates: 0.55± 0.13 mg l -1 and dissolved oxygen 3.95± 0.55 mg l-1. Distribution: —Currently known only from the type locality. Etymology: —Named after the type locality, Kodaikanal Lake. Observations: —In the SEM the external valve face is domed slightly (Figs 4–A, C). Areolae are arranged into uniseriate striae, which alternate with wide, raised fascicles. The central areolae appear slightly enlarged, perhaps 2–3× greater than the diameters of other valve face areolae. There are small, siliceous nodules scattered across the periphery of the valve face and mantle (Figs 4–A, C, D). Internally, there is a covering across the valve face, creating an internal covering over the areolae (Figs 4–E, F, G). There is a ring of marginal fultoportulae; each bearing three satellite pores (Figs 4-E, F). Rimoportulae number 2–3/valve, and are located at the same level as the fultoportulae (Figs 4–E, F, G). The valvocopulae has a fimbriate margin (Fig. 4–B). Central fultoportulae are absent. Spicaticribra kodaikanaliana differs from Spicaticribra kingstonii Johansen et al. by the presence of small siliceous plaques on the periphery of the valve and the absence of larger sized areolae in the center of the valve (Figs 19, 20 in Johansen et al. 2008). The raised external pores of the fultoportulae (Fig. 20 in Johansen et al. 2008) are very prominent in S. kingstonii. Order Rhizosoleniales Silva 1962 Family Rhizosoleniaceae De Toni 1890 Genus Urosolenia F.E. Round & R.M. Crawford in Round et al. 1990Published as part of Karthick, B. & Kociolek, J. P., 2011, Four new centric diatoms (Bacillariophyceae) from the Western Ghats, South India, pp. 25-40 in Phytotaxa 22 (1) on pages 29-32, DOI: 10.11646/phytotaxa.22.1.2, http://zenodo.org/record/477670
Nitzschia taylorii Alakananda, P. B. Hamilton & Karthick 2012, sp. nov.
No full textNitzschia taylorii Alakananda, P.B.Hamilton & Karthick, sp. nov. (Figs 1–25) Valves lanceolate to linear lanceolate with protracted round to capitate apices. Valve mantle wider on keel side with siliceous nodules present immediately below keel. Length 22–42 µm, width 5–7.5 µm with 21–25 striae in 10 µm and 10–14 fibulae in 10 µm. Keel marginal, rounded, elevated from valve face and mantle (Figs 13, 14). Raphe continuous from apex to apex without central area (Fig. 18) and with terminal apices deflected towards valve face as a continuous loop across apex mantle (Figs 15, 17). Striae uniseriate across valve face, extending onto keel (Fig. 16). Mantle on opposite side of keel, with 2–3 elongated areolae and a broad hyaline basal margin (Fig. 18). On keel side, mantle with 2–4 elongated areolae comprising each stria (Figs 20, 21) with a solid surface at basal margin scattered with small papillae (Fig. 26). Areolae on valve face round to elongated depressions, not occluded (Fig. 22). Internally, each stria covered by hymen, and fibulae round to rectangular in shape throughout valve (Figs 23, 25). Cingulum composed of numerous open copulae. Epicingulum of four bands, all with different surface structure. Valvocopula with single row of large elliptical pores on pars exterior and a row of small fine papillae along bottom of band (Figs. 20, 26). Second and third bands with narrow external exposure, with no visible pores, but with fine papillae along bottom of band (Fig. 26). Fourth band broad with a series of narrow elongated pores along pars exterior and a wide area devoid of structure at base of band (Fig. 21). Type:— INDIA. Bangalore: Begur wetland situated at Bangalore, 12° 52' 20" N, 77° 37' 58" E, elevation 900 m, March 2009. B. Alakananda & G. Supriya, s.n. (holotype CESH-5-1881! (circled specimen on slide); isotype CANA 85055! (circled specimen on slide)). Ecology:— Nitzschia taylorii was found in three wetlands viz., Begur, Hulimavu and Vaderahalli, characterized by basic pH (8.6 ± 0.6), alkalinity of 293.3 ± 80.8 mgL -1 and conductivity of 735.7 ± 322.5 µScm -1. Nitrate and phosphate values of these wetlands were 0.56 ± 0.95 mgL -1 and 0.33 ± 0.39 mgL -1 respectively. BOD and COD of these wetlands were recorded as 13.5 ± 7.9 mgL -1 and 37.3 ± 11.7 mgL -1 respectively. Etymology:— The species epithet is named for our colleague and friend Dr. Jonathan Charles Taylor (North West University, South Africa) whose support for diatom studies in India is hereby acknowledged and who has been an inspiration to both Karthick and Alakananda. Observations:— Nitzschia taylorii is distinguished by the separation of the keel from the valve face, the continuous raphe, large uniseriate areolae on the keel, row of nodules on the mantle below the keel, and the distinct morphology of the epicingulum bands. This taxon can be compared to N. solita Hustedt (1953: 152) in its general outline, although N. taylorii is more lanceolate (not constricted linear-lanceolate) and with distinct capitate apices. Both N. taylorii and N. solita have the same areolate morphology on the valve face and keel. Nitzschia taylorii is distinguished from N. steynii Cholnoky (1966: 207) by its lanceolate shape, the broader fibulae and finer striae. Nitzschia taylorii is less similar to N. frustulum (Kützing 1844: 63) Grunow (in Cleve & Grunow1880: 98) and distinguished by its lanceolate shape with protracted capitate apices, uniseriate striae (not biseriate) on the keel. Further N. frustulum is presented with an interrupted raphe (Fig. 19), where as N. taylorii is characterized by an uninterrupted raphe (Fig. 18). Specimens of N. frustulum sensu lato, identified from brackish-like waters, have also been identified from the type locality of N. taylorii. Four other taxa, N. costei Tudesque, Rimet & Ector (2008: 485), N. macedonica Hustedt (1945: 946), N. tropica Hustedt (1949: 147) and N. liebethruthii Rabenhorst (1864: 157) have similar valve outlines, approximate stria densities and fibula structure. In LM observations these taxa could be confused. In SEM, the differences between taxa were distinguished by valve outline (N. tropica), areolae formation on the keel (N. macedonica, N. tropica, N. costei), valve surface relief (N. macedonica), silica nodules on the mantle side of the keel (N. taylorii) and cingulum structure (N. tropica, N. costei) (compare Table 1).Published as part of Alakananda, B., Mahesh, M. K., Hamilton, Paul B., Supriya, G., Karthick, B. & Ramachandra, T. V., 2012, Two new species of Nitzschia (Bacillariophyta) from shallow wetlands of Peninsular India, pp. 13-25 in Phytotaxa 54 (1) on pages 15-19, DOI: 10.11646/phytotaxa.54.1.2, http://zenodo.org/record/506099
Four new centric diatoms (Bacillariophyceae) from the Western Ghats, South India
No full textKarthick, B., Kociolek, J.P. (2011): Four new centric diatoms (Bacillariophyceae) from the Western Ghats, South India. Phytotaxa 22 (1): 25-40, DOI: 10.11646/phytotaxa.22.1.2, URL: http://biotaxa.org/Phytotaxa/article/view/phytotaxa.22.1.
Stauroneis dharwarensis Wadmare & B. Karthick 2022, nom. nov., stat. nov.
No full textStauroneis dharwarensis Wadmare & B.Karthick nom. nov., stat. nov. (Figs 19–41, Fig. 24 represents the lectotype) Basionym:— Stauroneis anceps f. indica in Gandhi 1959a, Ceylon Journal of Science (Biology Section), p. 104, 105, fig. 25 (here reproduced as Fig. 19). Type:— INDIA. Dharwar, Karnataka. Dharwar pools from paddy and millet fields watercourses during rains, 15°26’34.8” N, 74°54’43.2” E. Mr. H. P. Gandhi on 14 th August 1949 . Lectotype (designated here):—Agharkar Research Institute (AHMA) Gandhi Collection! Slide- Sr 48, here illustrated as Fig. 24. Description:—LM (Figs 19–31): Valves broadly lanceolate with constricted, subrostrate to rostrate apices. Length 32.0–64.0 µm, breadth 12.0–15.0 µm. Axial area narrow, widening at centre. Stauros bow-tie shaped, widening towards valve margin. Raphe slightly coarse with straight central raphe ends, terminal raphe fissures unilaterally deflected. Striae strongly radial punctate, 17–19/10 µm. Areolae punctate to transapically elongated, discernible in LM. (n= 36). SEM (Figs 32–41): Externally (Figs 32–36), valves linear-lanceolate with axial area narrow throughout but wider at centre (Figs 32, 36). Central raphe ends tear-drop shaped (Figs 32, 33). Terminal raphe fissures continuing onto mantle (Figs 34, 35). Striae uniseriate, composed of transapically elongated areolae, 24–28 in 10 µm (Figs 33–35). Internally (Figs 37–41), stauros broad, thickened and expanded (Figs 37, 38, 40). Central raphe ends slightly deflected, terminating onto well-developed stauros (Figs 38, 40). Terminal raphe fissures terminating onto helictoglossae (Figs 38, 39). Striae radiate, areolae with hymen occlusions (Figs 39–41). Remarks:—Valve dimensions of the specimens examined in the present study have a wider size range than H. P. Gandhi in the original description- length 54.0–58.0 µm; width 14.4 µm (see Table 2). This taxon is also observed in Sr 46, collected by H. P. Gandhi from the same site at the same time and date as Sr 48. Etymology:—The specific epithet “ dharwarensis ” refers to the type locality Mugad, Dharwar district, Karnataka, where H. P. Gandhi originally collected the sample.Published as part of Wadmare, Neha & Karthick, Balasubramanian, 2022, Revisiting two Stauroneis Ehrenberg (Bacillariophyta) from H. P. Gandhi's Diatom collection: Notes on Ultrastructure, Types and Nomenclature, pp. 42-52 in Phytotaxa 555 (1) on pages 47-48, DOI: 10.11646/phytotaxa.555.1.3, http://zenodo.org/record/687561
Adlafia kociolekii C. Radhakrishnan, Sudipta K. Das, C. E. Wetzel & B. Karthick 2023, sp. nov.
No full text<i>Adlafia kociolekii</i> C.Radhakrishnan, Sudipta K.Das, C.E.Wetzel & B.Karthick <i>sp. nov.</i> (Figs 2–43) <p> <b>Description:</b> —LM (Figs 2–28): Valves lanceolate to linear-lanceolate, elliptical, with acute apices: valve length 16– 53.5 μm, width 6–10.5 μm (n=25). Raphe slightly lateral and straight, inflated proximal ends, very slightly deflected to primary side, distal ends deflected in opposite direction. Striae uniseriate, 26–30 in 10 μm, composed of round areolae, radiate at centre, parallel to convergent near apices. Valves with narrow axial area [sternum], central area broad and elliptical in large valves, narrow, straight in smaller ones. Voigt discontinuity is clearly discernible towards both poles.</p> <p>SEM (Figs 29–43): Externally, the raphe system is narrow and not prominent (Figs 29–30). Proximal raphe ends slightly dilated and teardrop-like (Figs 34–35). Hook-like distal ends bend in the opposite direction (Figs 30–33). Uniseriate striae, areolae mostly covered with hymenes, clearly visible only when thoroughly oxidized (Figs 29–31). The shape of the areolae is round to oval near mantle and oval to elongate near axial area. Areolae more regularly arranged on primary side; less regular on secondary side (Fig. 29). Areolae more elongate near the central area (Fig. 34).</p> <p>Internally, raphe is thin and almost straight and the sternum more elevated (Figs 36–37). Distal raphe ends slightly bent, with long raised helictoglossae (Figs 38, 40–41). Proximal raphe ends are deflected in the opposite direction to the distal ends (Fig. 36). Striae form round to elliptical areolae opening on entire valve (Figs. 42–43). Mantle is deep, a rows of areolae is present near to distal ends and terminating with helictoglossae (Fig. 40).</p> <p> <b>Type locality:</b> Panchgotey, Kyongnosla Alpine Sanctuary, Sikkim, India, 27.3197° N, 88.5455° E, 3888 m a.s.l.; attached to moss (epibryophytic) patches on rocks (Agharkar Herbarium of Maharashtra Association (AHMA) #2421, holotype, an example illustrated in Figure 2; Central National Herbarium (CAL), Isotype no. CAL /ALG.60).</p> <p> <b>Etymology:</b> The species name is in the honour of eminent diatomologist Dr John Patrick Kociolek from CU Museum of Natural History, the University of Colorado at Boulder, USA.</p> <p> <b>Ecology and distribution:</b> The type material was aerial in occurrence. The species was also found epilithic in freshwater and in subaerophytic habitats in northeast India. A small population of the taxon was found epipsammic habitat of a stream near Khamrang, Mizoram. Rare occurrences of the taxa were also noted on wet walls in Angori (Meghalaya) and Keitum (Mizoram). The details of the distributions of the taxon in various parts of northeast India, along with the other diatoms growing in consortium, are presented in Table 1.</p>Published as part of <i>Se. Wetzel & Karthick, Balasubramanian, 2023, Adlafia kociolekii sp. nov. (Bacillariophyceae): a new naviculoid diatom from the Eastern Himalayas, India, pp. 62-72 in Phytotaxa 595 (1)</i> on pages 64-66, DOI: 10.11646/phytotaxa.595.1.4, <a href="http://zenodo.org/record/7889438">http://zenodo.org/record/7889438</a>
Platessa arborea C. Radhakrishnan, S. Sherly & B. Karthick 2022, sp. nov.
No full textPlatessa arborea C. Radhakrishnan, S. Sherly & B. Karthick sp. nov. (Figs 1–67, Fig. 9 represents the holotype) LM Description (Figs 1–60):—Valve elliptical with narrowly rounded apices. Raphe-sternum valve (RSV): Length: 6.5–9.5 µm, width: 3.5–4.5 µm, ratio length/width: 1.6–2.2 (n = 60). Axial area narrow and hardly discernible, visible only near center of the valve; central area nearly rectangular shape, bordered by 2–3 shorter striae frequently more widely spaced. Striae radiate throughout the valve, 22–24 in 10 µm. Raphe slightly filiform expanded proximal raphe endings. Sternum valve (SV): wide axial area, Length: 6.0–9.0 µm, width: 3.5–4.5 µm. Striae densely arranged 22–24 in 10 µm, parallel at centre, radiate towards apices. SEM Description (Figs 61–67):—Raphe-sternum valve (RSV): Externally, raphe filiform, slight curvature found near ends (Figs 61 & 63). Proximal raphe ends positioned in a broadened shallow groove, distal raphe located in the shallow groove with cone-shaped endings, and both ends slightly bend to the same side (Fig. 61). Striae mostly uniseriate; however found biseriate at 2–3 striae near apices. (Fig. 61). Areolae, apically slit-like throughout the valve, only at the center of the valve it is round-shaped towards axial area (Fig. 61). Internally, proximal raphe ends are strongly hooked, a very remarkable feature which is infrequent in other Platessa species, and its distal ends are curved on opposite sides, terminating in well-developed helictoglossae (Figs 64, 65). Striae lowered between raised virgae. Width of the interstriae is wider than the striae. Striae internally rectangular to round in shape and mostly covered with hymen (Figs 64, 65). An apparent depression is observed on the central nodule (Figs 64, 65). Sternum valve (SV), externally, axial area covered with several irregular shape depressions distributed on the surface of the valve (Fig. 62). Striae uniseriate, however, found biseriate at more than 10 striae near the valve mantle (Fig. 62). Interstriae is raised, and the width of striae is unequal (Fig. 62). Internally, axial area is flat and features are not easily visible (Fig. 66). Biseriate striae found near the mantle with hymenated areolae. Interstriae raised its width slightly more than the striae (Fig. 67). Holotype (designated here):—Slide #58/55, Sample #2878; deposited at the Diatom Collection, Agharkar Research Institute Herbarium (AHMA), Pune, India. Type locality:— INDIA, Sikkim, composite tree moss sample collected on 22 November 2019 on the way to Khecheopalri Lake, West Sikkim district (27.34829 °N, 88.19187 °E; elevation 1794 m a.s.l.) by Radhakrishnan Cheran. Etymology:—Named after the habitat (tree) on which it was found. In Latin, the tree is called an Arbor.Published as part of Sherly, Sheena, Radhakrishnan, Cheran & Karthick, Balasubramanian, 2022, Platessa arborea sp. nov. (Bacillariophyceae): A new tree moss dwelling diatom from the Eastern Himalayas, India, pp. 151-158 in Phytotaxa 552 (2) on pages 152-153, DOI: 10.11646/phytotaxa.552.2.2, http://zenodo.org/record/669098
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