Definitions For Glossary Terms
- OBLIQUE
- Slanting in any direction between vertical and horizontal.
- OBLONG
- Somewhat longer than broad (compare with
elongate).
- OBSOLESCENT
- Very faintly indicated, almost gone.
- OBSOLETE
- Absent.
- OCCIPITAL CARINA
- An upside-down U-shaped ridge on the back or posterior surface of the
head; the occipital carina differentiates the posterior
occiput and
postgenae from the dorsal
vertex and
temples and lateral
genae (see also
genal carina).
[drawing][photo]
- OCCIPITAL FORAMEN
- Opening on the posterior surface of the head through which organs of
the head and body are connected; sometimes called the foramen magnum.
[drawing][photo]
- OCCIPITAL MARGIN
- Abruptly angled or carinate posterodorsal margin of the head that
differentiates a dorsal surface from an abruptly declined posterior
surface (see also occipital
carina).
- OCCIPITAL SUTURE
- In Mymaridae, term used for a groove on the sides and back of the
head in a position similar to the occipital
carina of many other chalcids, but which extends from the
malar sulcus and likely is
synonymous with the postgenal
sulcus. [photo]
- OCCIPUT
- Posterior surface of the head above the
occipital foramen.
[drawing][photo]
- OCELLAR AREA
See stemmaticum
- OCELLAR TRIANGLE
- Region of the head delimited by the three ocelli.
- OCELLAR-OCULAR GROOVE
- Term used for a transverse groove between the posterior ocellus and
upper margin of the eye in some Eucharitidae (see also
vertexal sulcus).
- OCELLOCULAR LINE
- Minimum distance between a posterior ocellus
and eye margin, abbreviated as OOL or OOD.
[drawing]
- OCELLUS
- (pl., ocelli) One of typically three bead-like lenses usually
arranged in a triangle near the dorsal surface of the head; sometimes
referred to as a simple eye in contrast to the compound
eye.
[drawing]
- OLISTHETER
- Term used for the composite tongue-and-groove interlocking mechanism
of the first valvulae and
second valvulae of the
ovipositor stylets, and
consisting of the aulax and
rhachis, respectively.
[drawing]
- OMMATIDIUM
- (pl., ommatidia) Single sensory cell of a compound eye (see
also facet).
[drawing][photo]
- OOD See
ocellocular line
- OOL See
ocellocular line
- OPEN LINEA CALVA
- A linea calva in which the
bare band is continuous to the posterior margin of the wing, not being
entirely or substantially closed posteriorly by setae; by definition an
open linea calva can be an entire
linea calva or an interrupted
linea calva, but not a closed
linea calva.
- ORAL CAVITY/FOSSA
See mouth cavity
- ORBIT See
eye margin
- ORTHOGNATHOUS
- Position of the head if the long axis is oriented more or less
vertically and the mouthparts are directed ventrally; sometimes used as
synonym of hypognathous.
- OUTER PANEL OF AXILLA
See lateral
panel of axilla
- OUTER PLATE OF
OVIPOSITOR
- Anterior, lateral part of the U-shaped last metasomal tergum, which
articulates anteriorly with the first
valvifer of the ovipositor
(see also inner plate
of ovipositor and ovipositor
sheaths). [drawing][drawing][drawing]
- OVAL/OVATE/OVOID
- Sometimes used for a symmetrical elliptical shape, but more correctly
designating an egg shape, i.e. with one narrower and one broader,
rounded end (see also lanceolate
and spatulate).
- OVIPOSITOR
- Composite term for the egg-laying apparatus of females, which
consists of the outer ovipositor
sheaths and inner drilling
ovipositor stylets, but
sometimes used only for the stylets.
[drawing][drawing]
- OVIPOSITOR SHEATHS
- Paired outer protective sclerites surrounding the
ovipositor stylets, which
are formed from the third valvulae or gonostyli; the term is sometimes
used to include the inner
plate of the ovipositor but more correctly is the slender apical
portion that often is differentiated from the inner plate by a slight
constriction (see also outer
plate of the ovipositor).
[drawing][photo][drawing]
- OVIPOSITOR STYLETS
- Inner, drilling structures of the ovipositor;
the term is sometimes used only for the actual cutting valves, the
second valvulae, and sometimes
for the combined second valvulae and interlocked
stylet sheath or
first valvulae.
[drawing][drawing]