Rhynchoclevelandella hastula (Kidder, 1937)

(Figs 21L–T, 22; Supporting Information, Table S24)

Rhynchoclenelandella hastula was detected and morphologically characterized in one host population (PGW). The ciliate was present in every dissected PGW individual and moderately abundant.

Description based on PGW population: Small- to medium-sized Clevelandellidae (on average 86 × 31 µm in vivo, 80 × 28 µm excluding single unusually large (142 × 53 µm) individual, range 62–142 × 23–53 µm; on average 82 × 24 µm in protargol preparations, range 64–94 × 18–31 µm). Slender spear or spade shape (L/ W 2.5 –3.4 in vivo, 2.9– 4.2 in protargol preparations), left-sided notch at base of peristomial projection (Fig. 21L, M, P), inconspicuous or absent in smaller cells (Fig. 21N, Q). Posterior peristomial projection conspicuously elongated (about 40% of cell length on average), typically curves rightward (Fig. 21L, M, N, P, Q), in large cells visibly curved in last third (Fig. 21L, M). Macronucleus broadly ellipsoidal, posterior end sometimes pointed (Fig. 21P, S). Karyophore rarely visible, attached to posterior end of macronucleus (Fig. 21O, S). Micronucleus ellipsoidal, about 5.1 µm across. Somatic cilia limited to approximately anterior 60% of cell length. Dorsal kineties almost straight in protargol preparations (Fig. 21R). Free right sutural kinetofragments present (Fig. 21P). Adoral zone extends about 44% of cell length on average, composed of an average of 26 membranelles (range 23–28).

Regarding measured characteristics (Supporting Information, Table S24), our population is slightly broader than that ofKidder (1937) (L/ W 2.8 in vivo, 3.4 in protargol preparations vs. 3.8).