ocular peduncle

ocular peduncle
See: eyestalk [Martin, 2005].
Eyestalk [Williams, 1984].
Peduncle movably articulated with cephalon, with compound eye at distal end, sometimes with two or three segments, sometimes retractable. (Syn. eyestalk) [McLaughlin, 1980].
(Order Decapoda):
One of two eye-bearing, movable projections of head; typically consists of two segments (proximal basiophthalmite and distal cornea-bearing podophthalmite). Segment of head (ophthalmic segment) bearing ocular peduncles is termed acron and is not considered to be true somite. (retractile, nonretractile; two-segmented, three-segmented; clubshaped, conical, dilated, elongate, oval, triangular; pubescent, setiferous). (Syn. eyestalk) [Stachowitsch, 1992].
(Order Mysida):
One of two eye-bearing movable projections of head. Consists of single segment and may bear papilla on inner or dorsal surface. (Syn. eyestalk) [Stachowitsch, 1992].
(Order Stomatopoda):
One of two eye-bearing, movable projections of medial (ocular) plate of acron. (cylindrical, dilated, subtriangular). (Syn. eyestalk) [Stachowitsch, 1992].
(Order Leptostraca):
Movable, eye- or visual pigment-bearing projection on each side of head (cephalon). (simple, denticulate = serrate, flat and crescentic, scimitar-like; with/without ocular scale). (Syn. eyestalk) [Stachowitsch, 1992].
(Order Euphausiacea):
One of two compound eye-bearing, movable projections of head. Consists of two indistinctly separated segments and bears photophore. (Syn. eyestalk) [Stachowitsch, 1992].

Crustacea glossary. . 2011.

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Look at other dictionaries:

  • ocular peduncle — (ARTHROPODA: Crustacea) A movable peduncle (eyestalk) with a compound eye at the distal end, sometimes with two or three segments, sometimes retractable …   Dictionary of invertebrate zoology

  • peduncle — A stalk like structure [AHD]. Basal portion of certain appendages; also fleshy part of body in some cirripeds (Lepadomorpha), between capitulum and attachment to substrate with or without armor of chitinous or calcareous beads, scales, or… …   Crustacea glossary

  • ocular scale — Articulating plate attached mesially on eyestalks (some Anomura, Stomatopoda) [Poore, 2004]. Scale like structure located on basal segment of eyestalk (Fig. 3A) [Perez Farfante and Kensley, 1997]. (Order Stomatopoda): One of two small, dorsally… …   Crustacea glossary

  • eyestalk — A pre segmental appendage on either side of the median line of the carapace and bearing on its distal surface the cornea [Ingle, 1983]. Articulating eye comprising peduncle and (usually) pigmented cornea [Poore, 2004]. Peduncle movably… …   Crustacea glossary

  • eye — (Order Cumacea): Photosensitive organ on dorsal surface of carapace; typically unpaired and positioned on ocular lobe (paired, unpaired) [Stachowitsch, 1992]. (Order Tanaidacea): One of two photosensitive organs on carapace; positioned… …   Crustacea glossary

  • compound eye — Array of contiguous ommatidia having common optic nerve trunk; paired [Moore and McCormick, 1969]. Paired array of contiguous ommatidia having common optic nerve trunks [McLaughlin, 1980]. (Order Cladocera): One of two large photosensitive organs …   Crustacea glossary

  • ophthalmic scale — (Order Decapoda): Scale like projection on proximal segment of eye stalk (ocular peduncle). (unarmed, acuminate, serrate, with spines). See: ocular acicle [Stachowitsch, 1992] …   Crustacea glossary

  • orbit — Cavity in carapace containing eye [Williams, 1984]. Circular opening in front part of some decapod carapaces enclosing eyestalk [Moore and McCormick, 1969]. Circular to rectangular opening in anterior face of carapace supporting ocular peduncle… …   Crustacea glossary

  • papilla — (Order Mysida): Tube or finger shaped projection from inner surface of each ocular peduncle. (Syn. ocular papilla) [Stachowitsch, 1992]. (Class Ostracoda): Type of valve sculpture: small, step sided projection (one order of magnitude smaller tan… …   Crustacea glossary

  • eyestalk — see ocular peduncle …   Dictionary of invertebrate zoology

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