5
a
b
cox
b ..
en
h
50pm
Fig. 4. Development of mandible of Rehbachiella; (a) naupliar mandible with small coxal lobe bearing two spines medially; (b) stage L2:
increasing size of both coxa and basipod and two gnathobasic setae; (c) L3: outgrowing grinding plate and enhanced setation; (d) L4: more
fully developed plate, only one gnathobasic seta, and a distinct posterior tooth; (e) TS Ii : mandible again larger and better armed; (f) mandible
of stage TS2 in more median view; (g) TS5i: coxal grinding plate with a concave surface, inner edge subdivided into pars incisivus and pars
molaris, palp smaller than in preceding instars ; (h) ?Ts7: prominent coxal grinding plate, palp further reduced; (i) TS 13: huge coxal grinding
plate, differentiated inner edge, diameter of palp foramen as in nauplius (palp not preserved); arrow heads mark significant changes from stage
to stage).
length
loom)
1500
1000
500
200
100
a)
o'~rr~~~~~~~ __ ~~~~~~~~~--·
12341112123
4
5
S
L
T.
8
g 10 11 12 131t898
length
(pm)
1000
500
100
b)
.. 1 1 212
LT.
8
10 11
12
13 .... eFig. 5. Growth curves for total length (a) and length of trunk exclusive of furca (b); (I) data for large larval series of Rehbachiella, (2) smaller
series of Rehbachiella, (3) data for Artemia salina (from Weisz 1946, available from TS I); arrow in (a) points to deflection of the growth curve
in a larger series of Rehbachiella, mainly due cessation of growth in length of the head region ; arrow in (b) points to deflection of the growth
curve of Anemia, caused by cessation of growth of sexual segments (tsl2, 13).