Thecacineta calix Schroder 1907 (original) (raw)

2017

Abstract

Thecacineta calix (Schröder, 1907) (Figs. 5 a–d) Diagnosis. Marine loricate suctorian. Lorica filled with cell body, transversely ribbed and attached to its base. A fascicle of clavate tentacles in apical surface of body. Macronucleus ovoid with large contractile vacuole. Long and curved stalk with apical widening. Reproduction by vermigemmic budding. Morphological description. Marine. Cell body fully filling the lorica and attached to its base. Lorica size 50– 81 µm × 22–34 µm, ratio of length to width approximately 2:1, maximum width at the middle (Figs. 5 a–d). Whole lorica characterized with several annular ridges variable in number from 13 to 24 (Figs. 5 a–c). Apical surface of the body bearing a fascicle of clavate tentacles, 10–14 µm in length and 1 µm in thickness (Figs. 5 a and 5c). Macronucleus and micronuclei not observed. Stalk long, thin and curved with apical widening (physon) and base attaching to the host. Stalk 10–17 µm in length and 2.1–2.2 µm in thickness (Figs. 5 a–d). Reproduction by vermigemmic budding with formation of laterally vermiform protomit (Fig. 5 d). Swarmer without annular ridges or tentacles. Remarks. The observed specimens of Thecacineta calix (Schröder, 1907) differ from those earlier reported by a larger variation in the number of ribbed transverse annular ridges. In the observed specimens the transversely annulated ribs varied from 9 to 26 throughout the body (see Fig. 5 a,b,c). Moreover, the present specimens were two-fold smaller than that found in Mediterranean Sea, which was attached to the harpacticoid copepod Laophonte cornuta (Matthes, 1956). They were particularly comparable with those reported by Chatterjee et al. (2014) from Caribbean reef ecosystem. Host specificity and locality information. T. calix (Schröder 1907) is well known as a widespread suctorian ciliate attached to numerous groups of interstitial invertebrates such as nematodes and halacarid mites. In particular, it is frequent on the n [...]

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