Bollmannia chlamydes, Jordan, 1890

Bollmannia chlamydes View in CoL Jordan, 1890

Figure 17a–d View Fig

Material (fossil specimens) 11 specimens: Calabrian : Pacific Panama, Armuelles FM , 2 specimens PPP 3235 (figured specimens NMB P15493–94 View Materials ) , 9 specimens PPP 3236 .

Description Otolith size up to 4.2 mm in length. OL:OH = 1.15–1.4, increasing with size; OH:OT = 2.9– 3.5, decreasing with size. Predorsal angle low, often depressed, postdorsal angle expanded, postdorsal projection blunt, only slightly longer than postventral angle, not or very slightly bent outward. Ventral rim straight, horizontal. Anterior rim inclined, with projecting preventral angle; posterior rim nearly vertical, with broad, wide indentation at its middle. All rims smooth, except dorsal rim undulating and increasingly intense crenulated in large specimens ( Fig. 17b View Fig ).

Inner face flat in vertical direction and slightly bent in horizontal direction. Sulcus sole-shaped with low ostial lobe, moderately deepened, inclined at 15–18°. Caudal tip rounded, slightly bent upward. OL:SuL = 1.65–1.95. Subcaudal iugum long, relatively narrow. Dorsal depression wide, relatively deep and close to sulcus with distinct crista superior. Ventral furrow distinct, relatively distant from ventral rim of otolith. Outer face moderately to distinctly convex, decreasingly convex with size, strongest inframedian, relatively smooth with few furrows on dorsal field.

Discussion Only relatively small specimens are found in the Calabrian of Pacific Panama, which are here attributed to B. chlamydes ( Fig. 17c–d View Fig ). Tey differ from the large extant ones ( Fig. 17a–b View Fig ) in the lower ratio OL:OH (1.15–1.2 vs 1.25–1.4) and in being thicker (OH:OT <3.1 vs> 3.2). We contribute these differences to allometric growth. Today, B. chlamydes is reported from Pacific Colombia to northern Peru over muddy bottoms at depths of 10–120 m ( Froese & Pauly, 2023).