Cyathorobbea hypermnestra

Pröts, Philipp, Novotny-Diermayr, Veronica & Ott, Jörg A., 2024, A novel three-part pharynx and its parallel evolution within symbiotic marine nematodes (Desmodoroidea, Stilbonematinae), Organisms Diversity & Evolution 24 (3), pp. 353-373 : 361

Cyathorobbea hypermnestra , Cy. ruetzleri and Cy. agricola

The isthmus is short and stout in Cy. hypermnestra and Cy. ruetzleri , but elongated and narrow in Cy. agricola . In the latter, it also tapers the strongest from anterior to posterior compared to all other investigated species ( Fig. 1g –i ; Table 1; Fig. 7f–h ).

Figures

Fig. 1 Pharynx musculature of Stilbonematinae, CLSM optical sections. Anterior on the left side. a Eubostrichus topiarius, b Paralaxus cocos, c Catanema schiemeri, d Robbea lotti, e Robbea weberae, f Rob- bea judithae, g Cyathorobbea hypermnestra, h Cyathorob- bea ruetzleri, i Cyathorobbea agricola, j Laxus oneistus. Scalebars 20 μm. ap, anterior pharynx; b, bulbus; bd, buccal dilator muscle; c, corpus; da, dorsal ampulla; gd, gland duct; i, isthmus; sp, spiral muscle; spm, somato-pharyngeal mus- cle; sm, somatic muscle

Fig. 7 Pharyngeal region, pharynx nuclei, CLSM opti- cal sections. Colors: a–c, e, f: musculature in red/orange, nuclei in blue; d: musculature in blue, nuclei in magenta; nuclei within the orange labelled area/ outline are pharynx nuclei. For some species the outline of the pharynx is further indicated with white dashed lines. a Catanema schiemeri, b Robbea judithae, c Robbea lotti, d Rob- bea weberae, e Cyathorobbea hypermnestra, f Cyathorobbea ruetzleri, g Cyathorobbea agri- cola, h Laxus oneistus. Dashed lines indicate the outline of the pharynx. Scalebars 20 μm. en, elongated nucleus inside the pharynx; n, nucleus inside the pharynx; ne, epidermal nuclei