Acineta foetida Maupas, 1881

Chatterjee, Tapas, Dovgal, Igor, Nanajkar, Mandar & Fernandes, Veronica, 2019, Report of epibiont ciliates (Cilliophora: Suctorea) on pelagic ostracods (Crustacea: Ostracoda) from the Arabian Sea, Zootaxa 4695 (4), pp. 378-384 : 381-382

Acineta foetida Maupas, 1881

( Fig. 2E )

Material examined: Several specimens on pelagic ostracods Cypridina dentata (Müller, 1906) from station 16.

Brief Description: Suctorian ciliate with a triangular or trapezoidal, somewhat asymmetric body attached to the bottom of the lorica. The lorica is triangular or trapezoidal, asymmetric, often with transverse folds of irregular shape, usually located in its lower part. Stalk short, its length does not exceed the length of the body. There is the stalk extension (basal disk) in the zone of stalk-lorica connection, which can be immersed in the base of the lorica. The stalk is attached to the substrate by means of an attachment disk. Tentacles arranged in two apical bundles, actinophores poorly developed, sometimes absent. Macronucleus is rounded, central. Above the macronucleus single contractile vacuole positioned.

Measurements from present find: (measurements taken from 3 individuals; in μm) lorica length 32–40; lorica width 32–34; lorica thickness 16; size of macronucleus 10–16×11–13; length of tentacles 7–37; stalk length 6–15; stalk diameter 4; basal disk diameter 11.

Host and substrate specificity: Ubiquitous marine and brackish-water species, observed on inanimate substrates, algae, but often found on representatives of crustacean ( Dovgal 2013).

The species was observed on representatives of crusracean orders, eg. ( Dovgal 2013), on Amphipoda— Gammarus olivii Milne-Edwards, 1830 , G. subtipicus Stock, 1966 , Pontogammarus maeoticus (Sowinsky, 1894) and Orchestia bottae Milne-Edwards, 1840 ; Isopoda— Sphaeroma serratum (Fabricius, 1787) , S. pulchellum (Colosi, 1921) and Idotea baltica basteri (Pallas, 1772) ; Decapoda— Palaemon elegans Rathke, 1837 , Crangon crangon (Linnaeus, 1758) , Diogenes pugilator (Roux, 1829) , Astacus leptodactylus Eschscholtz, 1823 and Eriphia verrucosa (Forskal, 1775) ; Ostracoda— Cypridina dentata (Müller, 1906) (present report).

Distribution: Widespread found in the Mediterranean, North, Baltic, Black Sea and the Sea of Azov, on the Pacific coast of Canada and the Atlantic coast of Mexico ( Dovgal 2013); the Arabian Sea (Present report).

Remarks: Acineta foetida was registered as epibiont on benthic or meiobenthic organisms only. Our finding is a first registration of this species on planktonic marine Ostracoda.

Figures

FIGURE 2. A. Paracineta karunakarani Santhakumari, 1986; B. Paracineta karunakarani Santhakumari, 1986, arrow indicating budding; C. Ephelota gemmipara (Hertwig, 1876); D. Lecanophryella satyanandani (Santhakumari, 1986); E. Acineta foetida Maupas, 1881; F. Pelagacineta sp.