Fig. 3
From: Etmopteridae bioluminescence: dorsal pattern specificity and aposematic use
Spine base associated photophore (SBAP) close up structure. a External view of SBAP showing lens cells and the pigmented crown. b Transversal section of SBAP showing the internal structure of this new photophore type. c Longitudinal section of ventral photophore with a mean inclination angle < 3°. d Schematic shark illustration showing ventral and SBAP inclination angles (e) Longitudinal section of SBAP with a mean inclination angle ±35° turned toward the spine. Red crosses correspond to the center of the biggest lens cell; ɑ: angle; Ep: epidermis; I Ch: isolated chromatophore; Cl: connective layer; L: lens; M: muscle; Pc: pigmented crown; Ph: photocytes; Ps: pigmented sheath; Sp: spine