Spectrophotometry determined the total corporal carotenoids content (cephalothorax
and abdomen) in the shrimps according to the description by Yanar et al.
Average length of the cephalothorax
in each site according to sex and sampling dates.
The planktonic phase lasts for up to 2 y, and after this time [~20 mm cephalothorax
length (CL)], they become mainly benthic (Boyd 1967, Longhurst 1968) but often migrate up into the midwater region (Robinson & Gomez 1998).
Previous studies showed that molting is regulated by a variety of hormones, mainly coordinated through the interplay between molt-inhibiting hormone (MIH) secreted from the X-organ/sinus gland complex (XO-SG) in eyestalk and ecdysteroids secreted from Y-organ in cephalothorax
(Techa and Chung, 2015).
To summarize male morphology, cephalothorax
width, leg length.
Based in the morphology of cephalothorax
, genital process, abdomen, small appendages and body proportion, specimens collected in Ubatuba corresponds to the description of M.
They have a relatively slender cephalothorax
, not expanded like Ergasilus lobus Lin and Ho, 1998 [see Fig.
From the day female ovaries became visible through the cephalothorax
(around day 30 of the experimental period), aquaria were visually searched once a day for ovigerous females.
Measurements ([male]/[female]): Cephalothorax
: length 1.8/1.9-2.2, width 1.4/1.5-1.8, height 0.6/0.6-0.7.
The measurement of the total body length including cephalothorax
and abdomen without spinnerets was made using a calliper.
Generally speaking, the shrimp's body is divided into two segments: the cephalothorax
, which is comprised of the head and the thorax, and the abdomen.
The adult females of the genus Lernaea exhibit an extreme modification of the cephalothorax
. The mouth parts of the adult female are severely reduced, the body is elongate and vermiform, and the head is modified into four horn-shaped appendages, which are somewhat long and slender; the two outer or posterior ones are bifurcated and the anterior one is simple.