Parvodinium cf. inconspicuum (Lemmermann) S. Carty (2008:106)

Bustamante-Gil, Carolina, Boltovskoy, Andrés, Rengefors, Karin, Tavera, Rosaluz, Amat, Eduardo & Ramírez-Restrepo, Jhon J., 2021, Checklist, new records, and taxonomic annotations of freshwater thecate dinoflagellate (Dinophyceae) in Colombia, Phytotaxa 509 (2), pp. 135-167 : 146-147

Parvodinium cf. inconspicuum (Lemmermann) S. Carty (2008:106) . Figure 6

Basyonim: Peridinium inconspicuum Lemmermann (1899:350)

Synonyms:

Peridinium tabulatum var. inconspicuum in Playfair (1913:545)

Peridinium inconspicuum f. marchicum in Lindemann (1920:142)

Peridinium inconspicuum var. excavatum in M. Lefèvre (1932:130)

Dimensions: L: 20–28 µm–Td: 15–21 µm Thickness: 15 µm.

Cell shape: Pentagonal to oval. Angular epitheca, flat or concave antapex ( Fig. 6A ).

Thecal characteristics: Tabulation, Po, X, 4ʹ, 2a, 7ʹʹ, 6C, 5S, 5ʹʹʹ, 2ʹʹʹʹ. Epitheca longer than the hypotheca ( Fig. 6C ), with apical pore and apical groove platelets (Po+X) ( Fig. 6D ). The antapical plates may have little spines.

Cingulum and sulcus: Broad cingulum, without equatorial displacement. The sulcus penetrates in the epitheca and expands broadly to the antapex ( Fig. 6B ).

Ornamentation: Imperceptible with LM.

Locaties: Guatapé and Piedras blancas reservoirs in North-west Colombia.

Comments: Specimen recognition was based on the general shape of the cell, the presence of apical pore complex (APC, Fig. 6D ), and the general characteristics of cingulum and sulcus. These characters follow the descriptions by Carty (2014) and Moestrup & Calado (2018). The size of the specimens ( Table 6) agrees with the measures given by Moestrup & Calado (2018) and are larger than those in Carty (2014). P. incospicuum was not observed under SEM due to the thin theca. Identification performed here must be taken with caution, since detailed morphological characters of cingulum and sulcus were omitted.

World distribution: wide distribution ( Moestrup & Calado 2018).

Figures

FIGURE 6. LM and DIC view of Parvodinium cf. inconspicuum. A. Whole cell. B. Ventral view. C. Dorsal view. D. Apical view. Bar=5 µm.