urosome

Related to urosome: Duodecennial, Epicedial

urosome

(ˈjʊərəʊˌsəʊm)
n
(Zoology) the abdomen of arthropods
References in periodicals archive ?
A flap of the urosome can add strength to the leg movement.
Urosome with four segments, genital double somite subquadrate, lacking lateral medial protrusions and with rounded integumental window on each side of posterior half (arrows in Fig.
Habitus elongate, cylindrical, without a clear division between pro- and urosome. Total body length measured from anterior margin of rostrum to posterior margin of caudal rami, 620 [micro]m.
Abdomen with a broad white stripe close to thorax, urosome with a narrow grayish-yellow stripe.
About this same length was found for the two spines on the anterior third of the long urosome. The caudal rami have an inner and outer setose margin.
Antennule (A1), fifth leg (P5), genital somite complex and urosome somites usually contain distinguishable sexual characters that display dimorphism in the order Calanoida.
Females of this species can be distinguished by 1) the distal digitiform process on the outer lobe of the fifth leg; 2) the genital double somite being longer than wide, representing about 55% of length of urosome length; 3) the extremely slender body; and 4) the relatively short antennule, which equals only 22% of the total body length.
R III: in copepods it corresponds to the urosome with caudal ramus, whereas in cladocerans it includes the posterior part of the carapace and the postabdomen.
During the escape, the antennules are folded against the body sides with legs flattened against the urosome and the caudal rami folded shut like a closed fan (Fig.
The female carried 4-5 eggs of 0.09 mm diameter that were loosely attached to the urosome. Nearly complete nuclear 18S and 28S rRNA gene sequences and a partial mitochondrial cytochrome c oxidase subunit 1 (C01) gene sequence were obtained and are made available for future phylogenetic and systematic work.