Retinal topography, cell density and sizes of ganglion cells in the killer whale (Orcinus orca) were analyzed in retinal whole mounts stained with cresyl violet. A distinctive feature of the killer whale’s retina is the large size of ganglion cells and low cell density compared to terrestrial mammals. The ganglion cell diameter ranged from 8 to 100 µm, with the majority of cells within a range of 20–40 µm. The topographic distribution of ganglion cells displayed two spots of high cell density located in the temporal and nasal quadrants, 20 mm from the optic disk. The high-density areas were connected by a horizontal belt-like area passing below the optic disk of the retina. Peak cell densities in these areas were evaluated. Mean peak cell densities were 334 and 288 cells/mm2 in the temporal and nasal high-density areas, respectively. With a posterior nodal distance of 19.5 mm, these high-density data predict a retinal resolution of 9.6′ (3.1 cycles/deg.) and 12.6′ (2.4 cycles/deg.) in the temporal and nasal areas, respectively, in water.

1.
Dawson WW (1980): The cetacean eye; in Herman LM (ed): Cetacean Behavior: Mechanisms and Functions. New York, Wiley Interscience, pp 53–100.
2.
Dawson WW, Adams CK, Barris MC, Litzkov CA (1979): Static and kinetic properties of the dolphin pupil. Am J Physiol 237:R301–R305.
3.
Dawson WW, Brindorf LA, Perez JM (1972): Gross anatomy and optics of the dolphin eye (Tursiops truncatus). Cetology 10:2–12.
4.
Dawson WW, Hawthorne MN, Jenkins RL, Goldston RT (1982): Giant neural system in the inner retina and optic nerve of small whales. J Comp Neurol 205:1–7.
5.
Dawson WW, Perez JM (1973): Unusual retinal cells in the dolphin eye. Science 181:747–749.
6.
Dral ADG (1972): Aquatic and aerial vision in the bottle-nosed dolphin. Neth J Sea Res 5:510–513.
7.
Dral ADG (1977): On the retinal anatomy of Cetacea (mainly Tursiops truncatus); in J Harrison (ed): Functional Anatomy of Marine Mammals. London, Academic Press, pp 81–134.
8.
Dral ADG (1983): The retinal ganglion cells of Delphinus delphis and their distribution. Aquatic Mammals 10:57–68.
9.
Fukuda Y, Stone J (1974): Retinal distribution and central projection of W, X and Y cells of the cat’s retina. J Neurophysiol 37:749–772.
10.
Gao A, Zhou K (1987): On the retinal ganglion cells of Neophocaena and Lipotes. Acta Zool Sin 33:316–332.
11.
Hebel B, Hollander H (1979): Size and distribution of ganglion cells in the bovine retina. Vision Res 19:667–674.
12.
Herman LM (1990): Cognitive performance of dolphins in visual-guided tasks; in Thomas JA, Kastelein RA (eds): Sensory Abilities of Cetaceans. New York, Plenum, pp 455–462.
13.
Herman LM, Peacock MF, Yunker MP, Madsen CJ (1975): Bottlenosed dolphin: double-slit pupils yields equivalent aerial and underwater diurnal acuity. Science 189:650–652.
14.
Hughes A (1977): The topography of vision in mammals of contrasting life style: comparative optics and retinal organization; in Crescitelli F (ed): Handbook of Sensory Physiology: The Visual System in Vertebrates. Berlin, Springer, vol VII/5, pp 613–756.
15.
Hughes A (1981): Population magnitudes and distribution of the major modal classes of cat retinal ganglion cells as estimated from HRP filling and systematic survey of the soma diameter spectra for classical neurons. J Comp Neurol 197:303–339.
16.
Jacobs MS (1973): Further fiber counts of cetacean cranial nerve. Anat Rec 175:505–506.
17.
Jacobs MS, Jensen AV (1964): Gross aspects of the brain and fiber analysis of cranial nerves in the great whale. J Comp Neurol 123:55–72.
18.
Madsen CJ, Herman LM (1980): Social and ecological correlates of cetacean vision and visual appearance; in Herman LM (ed): Cetacean Behavior: Mechanisms and Function. New York, Wiley Interscience, pp 101–147.
19.
Mass AM, Supin AYa (1986): Topographic distribution of size and density of ganglion cells in the retina of a porpoise, Phocoena phocoena. Aquatic Mammals 12:95–102.
20.
Mass AM, Supin AYa (1989): Distribution of ganglion cells in the retina of an Amazon River dolphin Inia geoffrensis. Aquatic Mammals 15:49–56.
21.
Mass AM, Supin AYa (1995): Retinal cell topography of the retina in the bottlenosed dolphin Tursiops truncatus. Brain Behav Evol 45:257–265.
22.
Mass AM, Supin, AYa (1997): Ocular anatomy, retinal ganglion cell distribution, and visual resolution in the gray whale, Eschrichtius gibbosus. Aquatic Mammals 23:17–28.
23.
Mass AM, Supin AYa (1999): Retinal topography and visual acuity in the riverine tucuxi (Sotalia fluviatilis). Marine Mammal Sci 15:351–365.
24.
Mass AM, Supin AYa (2002): Visual field organization and retinal resolution of the beluga, Delphinapterus leucas (Pallas). Aquatic Mammals 28:241–250.
25.
Mass AM, Supin AYa (2007): Adaptive features of aquatic mammal’s eye. Anat Rec 290:701–715.
26.
Mass AM, Supin AYa (2010): Retinal ganglion cell layer of the Caspian seal Pusa caspica: topography and localization of the high resolution area. Brain Behav Evol 76:144–153.
27.
Mass AM, Supin AYa, Mukhametov LM, Rozanova EI, Abramov AV (2012): Morphological estimation of retinal resolution of a killer whale (Orcinus orca). Doklady Biol Sci 442:34–37.
28.
Mobley JR, Helweg DA (1990): Visual ecology and cognition in cetaceans; in Thomas JA, Kastelein RA (eds): Sensory Abilities of Cetaceans: Laboratory and Field evidence. New York, Plenum, pp 519–536.
29.
Morgane PJ, Jacobs MS (1972): Comparative anatomy of the cetacean nervous system; in Harrison RJ (ed): Functional Anatomy of Marine Mammals. New York, Academic Press, pp 117–244.
30.
Murayama T, Somiya H (1998): Distribution of ganglion cells and object localizing ability in the retina of three cetaceans. Fisheries Sci 64:27–30.
31.
Murayama T, Somiya H, Aoki I, Ishii T (1992): The distribution of ganglion cells in the retina and visual acuity of minke whale. Nippon Suissan Gakkaishi 58:1057–1061.
32.
Murayama T, Somiya H, Aoki I, Ishii T (1995): Retinal ganglion cell size and distribution predict visual capabilities of Dall’s porpoise. Marine Mammal Sci 11:136–149.
33.
Pack AA, Herman LM (1995): Sensory integration in the bottlenosed dolphin: immediate recognition of complex shapes across the senses of echolocation and vision. J Acoust Soc Am 98:722–733.
34.
Peichl L (1992): Topography of ganglion cells in the dog and wolf retina. J Comp Neurol 324:603–620.
35.
Perez JM, Dawson WW, Landau D (1972): Retinal anatomy of the bottlenosed dolphin (Tursiops truncatus). Cetology 11:1–11.
36.
Pettigrew JD, Dreher B, Hopkins CS, McCall MJ, Brown M (1988): Peak density and distribution of ganglion cells in the retina of microchiropteran bats: implication for visual acuity. Brain Behav Evol 32:39–56.
37.
Pilleri G, Wandeler A (1964): Ontogenese und funktionelle Morphologie des Auges des Finnwals Balaenoptera Physalus L. (Cetacea, Mysticeti, Balaenopteridae). Acta Anat 57(suppl 50):1–74.
38.
Pütter A (1903): Die Augen der Wassersaugetiere. Zool Jahrb Abt Anat Ontog Thiere 17:99–402.
39.
Rice DW (1998): Marine Mammals of the World: Sistematics and Distribution. Spec Publ No. 4. San Francisco, Society for Marine Mammalogy.
40.
Rochon-Duvigneaud A (1939): L’oeil des cétacés. Arch Mus Natl Hist Nat (Paris) 16:57–90.
41.
Rozanova EI, Alekseev AYu, Abramov AV, Rassadkin Yu N, Shestopalov AM (2007): Death of the killer whale Orcinus orca from bacterial pneumonia in 2003. Biologia Morya (Marine Biol) 33:371–373.
42.
Slijper EJ (1962): Whales. London, Hutchinson.
43.
Supin AYa, Popov VV, Mass AM (2001): The Sensory Physiology of Aquatic Mammals. Boston, Kluwer.
44.
White D, Cameron N, Spong P, Bradford J (1971): Visual acuity of the killer whale (Orcinus orca). Exp Neurol 32:230–236.
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