with no trace of respiratory structures.
were slightly longer than endopods in all legs (Figs.
Lysmata grabhami presents a continuous middorsal white stripe from the tip of the rostrum to the end of the telson and the outer border of the uropodal exopods
is also white (Figure 1).
With the absence of the labrum and concomitant modification of thoracopods into exopods
and endopods, these two genera are also excluded from any of the existing poecilostome families.
Morphological adaptations for pelagic life such as natatory exopods
, which occur in all species, and lightly calcified, almost membranous exoskeleton of some genera are evidence of the habitat they occupy (Bauer, 2004).
1 2 3 1 2 3 4 5 Maxillipeds Pereopod Thoracic Somite Appendages 1 2 3 1 2 3 4 5 Pleurobranchs - - - + + + + + Arthrobranchs - - - 1 1 1 1 - Podobranchs - r - - - - - - Epipods + + + - - - - - Exopods
+ * - - - - - - - Setobranchs - - - - - - - - TABLE 2.
Four pairs of biramous swimming legs composed of a precoxa, coxa, basis, exopod
, and endopod; with plumose setae on all exopods
, endopods, coxae, and bases.
Larvae recorded as dead or moribund (lying motionless in the bottom of the plastic beaker for prolonged periods but still beating the exopods
of their pereiopods) at the end of experimental trials were discarded, and those replicates were repeated.
Newly released larvae appeared to have undeveloped maxillipeds--the exopods
were lacking setae--but showed the characteristic ornamentation of the zoea I (see below).
In general, the number of setae increased in the exopods
of the phyllosoma appendages.
The family Sicyoniidae is morphologically peculiar in having the following features: (1) prosartema absent, (2) exopods
absent from second and third maxillipeds, (3) pleopods with one ramus only, and (4) pleurobranchiae absent from fourth to sixth thoracic somites.
of pereiopods 1 and 2 exhibited almost no change relative to stage III.