| Description: |
Stillabothrium lunae n. sp. Ruhnke, Aguilar, and Reyda (Informal synonym: Rhinebothriinae New genus 3 n. sp. 5 of Healy et al. [2009], Caira et al. [2014], Ruhnke et al. [2015], Marques and Caira [2016]) (Figs. 4B, 4H–4L, 5) Description (based on whole mounts of 13 complete mature worms and 2 scoleces examined with SEM): Worms (Fig. 5A) euapolytic, acraspedote 2.58–4.74 mm (3.72 ± 6.15; n ¼ 13) long, greatest width 450–600 (515 ± 43; n ¼ 13) at level of scolex; 8–14 (11 ± 1.4; n ¼ 13) proglottids per worm. Cephalic peduncle absent; darkly staining germinative zone present. Scolex (Figs. 4B, 5B) consisting of scolex proper bearing 4 stalked bothridia. Stalks 40–75 (54 ± 10; n ¼ 12) long by 55–100 (78 ± 16; n ¼ 12) wide, attached slightly posterior to middle of bothridia. Bothridia (Figs. 4B, 5B) finely to shallowly deltoid, facially loculated, 300–440 (364 ± 40; n ¼ 11) long by 240–365 (314 ± 33; n ¼ 13) wide; bothridial margins with thin rim of tissue (Fig. 4B). Anterior region of bothridia (Figs. 4B, 5B) with 7–8 horizontally oriented loculi (i.e., loculi that are wider than long). Posterior-most loculi in anterior bothridial region somewhat muscular (see Fig 5B). Anterior loculus 35–60 (43 ± 8; n ¼ 10) long by 50–90 (63 ± 13; n ¼ 11) wide. Posterior region of bothridia (Fig. 4B) with 6 (6 ± 0; n ¼ 10) nonmedial longitudinal septa dividing region into 7 loculi longer than wide; longitudinal septa in posterior region of bothridium not overlapping transverse septa in anterior region of bothridium. Marginal loculi absent. Loculi and septa (Fig. 4H) of distal bothridial surfaces bearing capilliform filitriches and coniform spinitriches. Bothridial rim bearing capilliform filitriches and several cilia (Fig. 4J). Proximal bothridial surface away from rim bearing acicular filitriches (Fig. 4J). Posterior portion of proximal bothridial surface (Figs. 4I, 4K) bearing patch of coniform spinitriches near, but not extending to, bothridial rim. Bothridial stalks and strobila (Fig. 4L) bearing capilliform filitriches only. ... |