4
Fig. 3. SEM micrographs of details of Rehbachiella; (a) eye region of a stage-4 larva (scale bar = 30 ttm); (b) 'neck organ' of a stage-3 larva
(scale bar = 30 ttm); (c) exposed inner edges of more posterior right-side trunk limbs of a stage-24 larva (TSlO; scale bar = 100 ttm); (d) setulate
filtratory setae, same specimen (scale bar = 3 ttm); (e) comb spine of more distal endites, same specimen (scale bar= 10 ttm); (f) setae of
proximal endites pointing into stemitic food grove, same specimen (scale bar = 10 ttm).
ic free-swimming rhizocephalan cirriped Briarosaccus
tenellus (Walossek et ai., in preparation).
With the development of the post-naupliar filter
apparatus, the trunk sternites invaginate progressively. A deep, V-shaped ventral food groove is formed,
with the trunk limbs inserting at the margin of this
groove. A further indication of the filter-feeding habit
of Rehbachiella is found in the different types of hairs
on the protopodal endites. They range from filter setae
with double rows of subordinate setules (distance 12 /lm), comb setae for cleaning more posterior limbs,
slender, or whip-like setulate setae, e.g. located at the
proximal endites (examples in Fig. 3d-f). The latter
setae are anteriorly curved and point into the groove
to thus produce the particle transport. There are three
sets of setae/spines on each of the more distal eridites
of the basipod, one anterior row of setae for retention
of particles, a median set of more spine-shaped setae,
and a posterior row of filter setae.
The spaces behind the C-curved protopods represent the sucking chambers. By opening and closing
during the beat of the limbs, they attracted food particles into the median inter-limb space and deep into the
sternitic food groove. The locomotory exopods may
have overlapped each other during the back stroke,
covering the more posterior ones with their setulate
Fig. 3. SEM micrographs of details of Rehbachiella; (a) eye region of a stage-4 larva (scale bar = 30 ttm); (b) 'neck organ' of a stage-3 larva
(scale bar = 30 ttm); (c) exposed inner edges of more posterior right-side trunk limbs of a stage-24 larva (TSlO; scale bar = 100 ttm); (d) setulate
filtratory setae, same specimen (scale bar = 3 ttm); (e) comb spine of more distal endites, same specimen (scale bar= 10 ttm); (f) setae of
proximal endites pointing into stemitic food grove, same specimen (scale bar = 10 ttm).
ic free-swimming rhizocephalan cirriped Briarosaccus
tenellus (Walossek et ai., in preparation).
With the development of the post-naupliar filter
apparatus, the trunk sternites invaginate progressively. A deep, V-shaped ventral food groove is formed,
with the trunk limbs inserting at the margin of this
groove. A further indication of the filter-feeding habit
of Rehbachiella is found in the different types of hairs
on the protopodal endites. They range from filter setae
with double rows of subordinate setules (distance 12 /lm), comb setae for cleaning more posterior limbs,
slender, or whip-like setulate setae, e.g. located at the
proximal endites (examples in Fig. 3d-f). The latter
setae are anteriorly curved and point into the groove
to thus produce the particle transport. There are three
sets of setae/spines on each of the more distal eridites
of the basipod, one anterior row of setae for retention
of particles, a median set of more spine-shaped setae,
and a posterior row of filter setae.
The spaces behind the C-curved protopods represent the sucking chambers. By opening and closing
during the beat of the limbs, they attracted food particles into the median inter-limb space and deep into the
sternitic food groove. The locomotory exopods may
have overlapped each other during the back stroke,
covering the more posterior ones with their setulate