Catanema schiemeri

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 : 363

Catanema schiemeri and C. sp.

In both C. schiemeri and C. sp., the dorsal gland ampulla is positioned at the anterior end of the corpus ( Figs. 5a, b and 6a, e, g ). Both subventral gland ampullae are situated near the anterior end of the isthmus, slightly posterior to the anterior-most nuclei of the isthmus in the respective subventral sectors ( Figs. 5c , 6a–h and 7a ).

Figures

Fig. 5 Dorsal and subventral gland ampullae. Anterior on the left side. a Catanema schiemeri, CLSM optical section, autofluorescence, corpus, b Catanema schiemeri, TEM micrograph, corpus c Catanema schiemeri, CLSM micrograph, isthmus, musculature in orange, nuclei in blue d Robbea lotti, CLSM optical section, musculature in orange, nuclei in blue, corpus e Robbea weberae, CLSM optical section, musculature in orange, nuclei in blue, corpus f Robbea judithae, CLSM optical section, musculature in orange, nuclei in blue, corpus g Cyathorobbea hypermnestra, CLSM optical section, musculature in orange, corpus h Cyathorobbea hypermnestra, TEM micrograph, corpus i Cyathorobbea hypermnestra TEM micrograph, anterior isthmus j Cyathorobbea ruetzleri, CLSM optical section, musculature

Fig. 6 Pharyngeal region, CLSM optical sections, Cat- anema schiemeri, dorsal and subventral ampullae, muscu- lature in orange, nuclei in blue a lateral view, b–d subventral view. e–h Catanema sp., auto- fluorescence optical sections, e specimen 1, f specimen 2, g–h specimen 3. Scalebars 20 μm. b, bulbus; c, corpus; da, dorsal ampulla; dg, dorsal gland; i, v, gland vesicles; va, subventral ampulla; vg, subventral gland

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