At the light microscopical level, the morphology of the cyprid appears to be surprisingly similar throughout the entire taxon, but studies with the scanning electron microscope have shown significant variation in the structure of the antennules
(Glenner et al.
Adult female holotype partially dissected as follows: urosome left intact and preserved in alcohol (ICML-EMU-COP-010815-14); antennules
, antennae, mouth parts, and P1-P4 dissected and mounted onto five slides (ICML-EMU-COP-010815-13); Colombia, Magdalena, Rodadero Bay, 11[degrees]14' North, 74[degrees]12' West, August 2015; coll.
In Chonopeltis, morphological differences include the absence of a pre-oral spine, trifoliate carpace and the absence of antennules
(Tam et al.
This stage began when the optical lobe, antennules
, antennas, mandibles, and abdomen were visible as separate entities as opposed to the undifferentiated v-shape of the previous stage in embryos stained with Bouin's solution (Fig.
On some individuals, the antennules
are more heavily pigmented, as are the spines on the hind tibiae.
expressed that the live cell clusters are located at the base of the antennules
and antenna, as well as the cephalic lobe, implying an epigenetic mechanism of germ cell specification in Fenneropenaeus chinensis.
ABSTRACT In this study the occurrence of sensory structures on the antennules
and antennae of the giant river prawn Macrobrachium rosenbergii (De Man) during postembryonic ontogenetic development were examined.
As a consequence of the fouling of antennules
, olfactory setae (responsible for chemically mediated perception of food and mates) can be damaged, possibly leading to the interruption of distance hemoreception (Bauer, 1989).
Notes: The primary male antennules
have only one, partly-fused minute terminal article (while the secondary have two unfused minute terminal articles).
The sympod on the antennules
of adult males was characterized development of soft sensory setae (see both species, after attaining size 6.
paranaensis inarmatus: complete molting, well-defined depression between head and valves (Figure 1), presence of horn-like protuberance on valves (Figure 2), antennules
with well developed system of hillocks (Figure 3), antennas with spine second segment exopod bisegmented (Figure 4), and absence of spinules on the inner margin valves.
You can see the antennules
, small hair structures, parasites that are living on the plankton, egg sacs on copepods.