- In biology, a
rachis /ˈreɪkɪs/ (from the
Ancient Gr****: ῥάχις [rhákhis], "backbone, spine") is a main axis or "shaft". In vertebrates,
rachis can refer...
- Each row of
radular teeth consists of One
central or
median tooth (or
rachidian tooth,
rachis tooth) On each side: one or more
lateral teeth And then...
- rhachi(o)-
spine Gr**** ῥάχις (rhákhis),
spine or
backbone rachial, rachialgia,
rachidian,
rachiopathy rhin(o)- of or
pertaining to the nose Gr**** ῥίς, ῥῑνο- (rhís...
-
calcitic layer. The
rachidian teeth have
three large cusps but no
marginal cusps,
instead the
outer sides of the
lateral cusps on the
rachidian have a comb-like...
-
longitudinally crenulated s**** sculpture, and a
broadly triangular central rachidian radular tooth and a lack of
umbilical callus.
Fresh s**** were also found...
- has a
length of 1.20 mm, the
rachidian tooth about.18 mm. wide (longer diameter). The
paired medial cusps of the
rachidian tooth are more
widely separated...
-
californica from the
larger Armina species are
separated rhinop****s,
rachidian teeth with 8-13
elongated denticles, and
lateral teeth with 7-9 triangular...
-
large apertures, a
concave columella and no
external calcitic layer. The
rachidian teeth have
prominent marginal denticles. The s**** is oblong-oval, the...
- elliptical. The
radula shows marked characteristics.
There is a
quadricuspid rachidian tooth, the two main
cusps being asymmetrical and aculeate.
Beside each...
- white.
Radular ribbon is robust, long,
about one-fifth the s**** length.
Rachidian tooth is squarish;
basal plate is with pair of
posterior lunule-shaped...
