Terebella Linnaeus, 1767

Bharathidasan, Veeraiyan, Sarathy, Palanivel Partha, Murugesan, Perumal & Nogueira, João Miguel De Matos, 2021, New records for associations between peritrich protozoan ciliates (Ciliophora, Sessilida) and polychaete worms (Annelida) from off the southeastern coast of India, Zootaxa 5071 (4), pp. 492-504 : 496

Genus Terebella Linnaeus, 1767

Diagnosis. Three pairs of branching branchie with short main stalks, usually on segments 2–4, but sometimes on discontinuous segments. Notopodia beginning on segment 4, extending for variable number of segments, frequently to posterior body; notochaetae medially winged and distally serrated, and alimbate and serrated, frequently with blade at an angle, usually with transition on types of chaetae from anterior to midbody notopodia. Neuropodia beginning on segment 5, with short handled avicular uncini in completely intercalated to partially back-to-back double rows from segment 11 until posterior body ( Fig. 2A, B ) ( Hutchings et al. 2021).

Figures

FIGURE 2. Specimens of Epistylis sp.1 attached to Terebella sp. (A–C) SEM images, (D, E) light microscopy images. (A). Epistylis sp.1. on the dorsal surface of the anterior end of the worm; (B). Epistylis sp.1 on the ventral surface of the anterior end of the worm; (C). Epistylis sp.1, on grooves between neuropodia; (D–E). Epistylis sp.1 attached to buccal tentacles of Terebella sp. White arrow points to folds of the posterior region of zooid, yellow arrow points to projecting tube formed by constriction of the peristomial lip, red arrow points to macronucleus.