FIGURE 13 in A new deep­sea pectinid bivalve from thermal vents of Manus back­arc Basin (south­western Pacific), Sinepecten segonzaci n. gen., n. sp. (Pectinoidea: Pectinidae), and its relationships with the genera Bathypecten and Catillopecten

FIGURE 13. Pattern of byssal notch morphogenesis in extant Pectinids displaying different mode of life (not to scale). 1 – 3: first successive ontogenetic stages exemplified by juveniles of Pecten maximus (1: post­larval; 2: without ctenolium; 3: with ctenolium); a – g: adults, byssally fixed (a – d), free­living (f – g), or both (e); ct: ctenolium; P: prodissoconch. a: Bathypecten vulcani; b: Sinepecten segonzaci; c: Hemipecten forbesianus; d: Chlamys varia; e: Aequipecten opercularis; f: Pecten maximus; g: Propeamussium watsoni. Thick black arrows indicate ontogenetic trajectories. Thin arrows outline the main growth allometries (parallel to commissure plan only) around byssal notch. For (b), crosses indicate place of byssal notch covered by its ventral edge and thus invisible (see Figure 6). Black anterior auricle of (f) corresponds to stage 3