Figure 5. Summary of the results regarding Hypothesis 4
on trait frequency . The boxplots on the left graphically show
proportion (from 0 to 1) of species with the selected traits across the
three beach levels, following the same colour coding of figures 1-4 for
beach level. Significant differences between pairs of levels after
generalized linear models are marked with asterisks (***:
p<0.001) (see Supplementary Table S7 for further details). The
drawings on the right of the boxplots illustrate the traits in four
genera; the silhouettes in the grey box show an overview of the whole
animals for the same four genera. Capital letters: A.Parotoplana sp. B. Otoplana sp. C.Coelogynopora sp. D. Monocelis sp. Small letters:a. Typical anterior end of Parotoplana, showing cephalic
area (black arrowhead) and brain capsule next to the statocyst (black
asterisk) b. Same as ‘a’ for Otoplana. c.Typical anterior end of Coelogynopora, without sensory cephalic
area (grey arrowhead) but with brain capsule next to the statocyst
(black asterisk). d. Typical anterior end ofMonocelis, without cephalic sensory area (grey arrowhead) and
without brain capsule (grey asterisk). e. Transverse
section of Parotoplana, showing the flatness of the body and the
ventral ciliary sole (black asterisk). f. Same as ‘e’ forOtoplana . g. Transverse section of Coelogynopora,cylindrical and without ciliary central sole. h. Same as ‘g’
for Monocelis . i. Transverse section of the
collar-shaped pharynx of Paratoplana . j. Transverse
section of the collar-shaped pharynx of Otoplana . k.Transverse section of the collar-shaped pharynx of Coelogynopora .l. Transverse section of the tubular pharynx ofMonocelis . m. Typical posterior end ofParotoplana showing the adhesive glands (black arrowhead) in a
belt as well as along the body sides. n. Typical posterior end
of Otoplana, showing the adhesive glands (black arrowhead) along
the rear of the body. o. Same as ‘n’ for Coelogynopora .p. Same as ‘n’ for Monocelis.