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 : 361

Catanema schiemeri and C. sp.

The spherical to slightly heart-shaped posterior bulbus accounts for roughly the same amount of the pharynx total length and is mainly devoid of musculature in both species ( Fig. 1c ; Table 1; Figs. 6a–c, e–h and 13a ).

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. 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. 13 Posterior pharynx region. CLSM maximum intensity projections, muscula- ture in orange, nuclei in blue. a Catanema schiemeri, b Robbea judithae, c Robbea lotti, d Rob- bea weberae, e Cyathorobbea hypermnestra, f Cyathorob- bea ruetzleri, g Cyathorobbea agricola, h Laxus oneistus. Scalebars a–e, h 20 μm; f, g 10 μm. b, bulbus; i, isthmus; n, nucleus; sm, somatic muscle