Abstract
The optics of a variety of stomatopod eyes has been investigated using goniometric eye-mapping techniques and anatomical measurements. The species examined come from 3 of the 4 existing superfamilies: the Gonodactyloidea, Lysiosquilloidea and Squilloidea. This paper examines acuity, optical axes and general features of eye shape. Stomatopod eyes are divided into 3 clearly distinct zones; the mid-band and two hemispheres. Each hemisphere consists of an edge region, a “visual streak” and a near mid-band region. The optical axes of many ommatidia from both hemispheres are skewed inwards towards the centrally placed mid-band and are rarely normal to the corneal surface. The large skew angle enables each hemisphere to examine an area which extensively overlaps that of the other hemisphere. As a result monocular distance judgement is possible. Most of the ommatidia in each hemisphere are part of a horizontally aligned but vertically acute “visual streak” area. There is one “visual streak” per hemisphere and both look into the same 5–10° strip. This narrow strip is also the area in space the mid-band ommatidia examine. An acute zone is present in the eyes of lysiosquilloid and gonodactyloid stomatopods and includes ommatidia, from both the hemispheres and the mid-band. Here inter-ommatidial angles, especially those in the horizontal direction, are reduced. Acute zone facets are enlarged to increase sensitivity rather than aid spatial resolution.
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Abbreviations
- AZ:
-
Acute Zone
- MB:
-
Mid-band
- D :
-
Corneal facet diameter, as MB facets are asymmetrical, values for width and height of each facet are given
- DH:
-
dorsal hemisphere
- f :
-
Focal length of each ommatidium, estimated from the centre of the corneal lens to the tip of the rhabdom
- NeMB:
-
Near mid-band ommatidia
- R :
-
Resolving power=1/2ΔΦaverage
- Rh :
-
Horizontal resolving power=1/2ΔΦh
- Rv :
-
Vertical resolving power=1/2ΔΦv
- VH:
-
ventral hemisphere
- Δρ:
-
Geometrical acceptance angle (a/f×57.3) of each ommatidium
- ΔΦh :
-
Horizontal inter-ommatidial angle, between facets along a row
- ΔΦv :
-
Vertical inter-ommatidial angle, between rows; Superfamily Gonodactyloidea
- g.c. :
-
Gonodactylus chiragra
- O.s. :
-
Odontodactylus scyllarus
- H.e. :
-
Hemisquilla ensigera; Superfamily Lysiosquilloidea
- L.t. :
-
Lysiosquilla tredecimdentata
- C.s. :
-
Coronis scolopendra; Superfamily Squilloidea
- O.o. :
-
Oratosquilla solicitans
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Marshall, N.J., Land, M.F. Some optical features of the eyes of stomatopods. J Comp Physiol A 173, 565–582 (1993). https://doi.org/10.1007/BF00197765
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DOI: https://doi.org/10.1007/BF00197765