The fifth pleonal segment is particularly elongated and bears a telson with uropods
. During this zoea stage, the differentiated eyes are not pedunculated but project away from the cephalothorax and carapace (Fig.
Remarks: The new species is included in Buchnerillo since it shows all the characters of the genus: small size; animal able to toll up into a perfect ball; endoantennal conglobation; dorsal surface tuberculated; cephalon with a wide frontal shield; pleonite 3 with epimera reduced; telson semicircular covering the uropods
in dorsal view; antenna short and stout with a flagellum of three articles; male pleopod 2 with distal article flagelliform.
Pleon 2 fused segments Uropods
Modified: hinge laterally along the pleon and pleotelson, enclosing the pleopods in a branchial chamber Location Venice, California, USA, among macroalgae Cat.
Antenna, antennula, maxilla, maxillule, maxilliped, pereon, pleon, pereopods, pleopods, pleotelson and uropods
were mounted between a depressed slide and a coverslip for observation and measurement in a Leica EZ4HD stereomicroscope (Thatcher, Oliveira, & Garcia, 2009).
A second region, the peraeon, of 7 segments, each with a pair of legs (peraeopods) and third region, pleaon, of 6 segments with pair of pleopods, except the last which together with biramous uropods
form a swimming tail pleotelson .
Pleomere 6 bearing widely separated uniramous uropods
of structure and shape similar to that of lateral plates.
flank the telson and are used for reverse propulsion and steering while forward swimming.
After the acclimation period, 180 animals were collected in summer for experiment I and 194 animals were collected in autumn for experiment II--all of them were female shrimp at the intermolt stage C--were randomly sampled, measured [total length (TL) i.e., from the tip of the rostrum to the tip of the unfolded uropods
, to the nearest 0.5 mm], weighed [blotted wet weight (WW), to the nearest 0.1 mg], and placed separately in individual cages (10 x 10 x 17 cm) distributed by four aquaria.
In a study in China, other tagging methods (e.g., hanging tag brands, unilaterally extirpating eyestalks, and cutting uropods
) were used and resulted in estimated recapture rates for juvenile fleshy prawns (Fenneropenaeus chinensis) from 0.001% to 1.510%.
Knock-down of HAX1 expression results in impaired motility and elongated uropods
, as well as decreased RhoA activity.
There is only one pair of uropods
, each with two branches, not two pairs.
At the end of the abdomen is a pair of slender biramous appendages, the uropods
. In between the uropods
is a tail-like segment called the telson.