Gomphonemopsis nana Lang Li, Yuhang Li & Junxiang Lai, 2024
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publication ID |
https://dx.doi.org/10.3897/phytokeys.239.114018 |
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persistent identifier |
https://treatment.plazi.org/id/38DDCB21-34E2-50C7-8DB0-705066E19F2F |
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scientific name |
Gomphonemopsis nana Lang Li, Yuhang Li & Junxiang Lai |
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sp. nov. |
Gomphonemopsis nana Lang Li, Yuhang Li & Junxiang Lai sp. nov.
Fig. 1A-P View Figure 1
Type materials.
Holotype. Slide MBMCAS286906 deposited in the Marine Biological Museum, Chinese Academy of Sciences (MBMCAS), Qingdao, China.
Iconotype. Fig. 1K View Figure 1 .
Type locality.
Qingdao Bay, Qingdao City, the Yellow Sea (36°3'33.45"N, 120°18'56.26"E). Collected from the blades of seagrass Zostera marina by Lang Li, 11 October 2022.
Description.
LM (Fig. 1A-J View Figure 1 ). Valves linear, heteropolar with obtusely rounded head pole and sub-acutely rounded foot pole, 4.0-7.4 μm long, 1.1-1.5 μm wide. Axial area very narrow. Raphe indistinguishable in LM. Central area hyaline, extended transapically, or occasionally asymmetrical because of the presence of a stria on primary side of the valve (Fig. 1A View Figure 1 ). Transapical striae sub-parallel throughout, except slightly radiate at apices, 26-30 in 10 μm.
SEM (Fig. 1K-P View Figure 1 ). Externally, each stria composed of two elongate to round areolae, one on the valve face, the other on the mantle. A row of areolae presented around apices (Fig. 1K View Figure 1 ). Areolae occluded by hymenes and becoming smaller towards the foot pole (Fig. 1K View Figure 1 ). Raphe central, more or less straight (Fig. 1K, L View Figure 1 ). Proximal raphe endings expanded, pore-like, and deflected in the same direction (Fig. 1K, M View Figure 1 ). Distal raphe endings slightly expanded and terminating on the valve face (Fig. 1K, L View Figure 1 ). Central area expanded transapically to the valve margin, but two areolae occasionally present on primary side (Fig. 1M View Figure 1 , white arrow). Girdle bands perforated with a double row of pores (Fig. 1L View Figure 1 , white arrowhead). Internally, areolae smaller and rounder than external ones (Fig. 1O View Figure 1 ). Central area slightly elevated. Proximal raphe endings bent to the same side (Fig. 1P View Figure 1 ) distal raphe endings terminate in small helictoglossae (Fig. 1O View Figure 1 ).
Etymology.
The Latin adjective Gomphonemopsis nana refers to the tiny dimensions of the new species as compared to other Gomphonemopsis species.
Distribution and ecology.
Gomphonemopsis nana is an epiphytic species known only from the type locality, where it occurs mainly in the low intertidal region at a temperature of 23.3 °C. The water salinity here was about 30 psu during sampling. Other species that were observed in the same sample include Amphora spp., Navicula spp., Nitzschia spp., G. exigua ( Kützing) Medlin, Licmophora californica Grunow, Tabularia parva ( Kützing) D.M.Williams & Round, T. fasciculata (C.Agardh) D.M.Williams & Round, Berkeleya rutilans (Trentepohl ex Roth) Grunow, Cocconeis scutellum Ehrenberg and Seminavis robusta Danielidis & D.G.Mann.
PhycoBank registration.
http://phycobank.org/104208.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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