Figure 4 in Pectoral-fin glands and delivery apparatus in the catfish genus Brachyrhamdia Myers, 1927 (Siluriformes: Heptapteridae)

Figure 4: Histological preparations of the right pectoral-fin spine of Brachyrhamdia species, indicating gland cells between bony spine and epidermis. (A) B. marthae, LIRP 10040, 23.9 mm SL, transversal section: (A₁) General view of spine (A₂) Detail of posterior edge of spine. (B) B. heteropleura, LIRP 7419, 30.9 mm SL, oblique transversal section: (B₁) General view of spine; (B₂) Detail of posterior edge of spine. Abbreviations: ad = anterior denticulation, ep = epidermis, ps = posterior serration, sp = pectoral-fin spine, vgc = superficial pectoral-fin spine venom gland cells. Epidermal cells indicated in B. heteropleura morphologically resemble club cells. Scale bar: 0.05 mm.