Ramisyllis Glasby et al., 2012

Aguado, M. Teresa, Ponz-Segrelles, Guillermo, Glasby, Christopher J., Ribeiro, Rannyele P., Nakamura, Mayuko, Oguchi, Kohei, Omori, Akihito, Kohtsuka, Hisanori, Fisher, Christian, Ise, Yuji, Jimi, Naoto & Miura, Toru, 2022, Ramisyllis kingghidorahi n. sp., a new branching annelid from Japan, Organisms Diversity & Evolution 22, pp. 377-405 : 13

Ramisyllis Glasby et al., 2012

Diagnosis (after Glasby et al. (2012), emendations in bold).

“Ribbon clade” Syllinae, with non-flattened body, more or less cylindrical segments and a multiaxial, dendriform pattern; first branch occurring after segments 14–24. Branches emerging after parapodia (not replacing them or dorsal cirri) and showing same segment size and cirri length as previous branches. Three antennae; palps free to base; two pairs of tentacular cirri; pharynx slender, middorsal tooth absent in adults; dorsal cirri articulated, with alternating thick/slender pattern on mid-body and posterior segments; ventral cirri present, not articulated, inserted proximally; single type of simple chaeta present, tomahawkshaped. Sexes separate. Reproduction by schizogamy, gemmiparitity. Acerous, dimorphic stolons. Commensal inside shallow water species of Petrosia . Mitochondrial gene order strongly modified. Nuclear ribosomal sequences highly derived compared to other Syllinae.