Fig. 4 in Polysyncraton (Ascidiacea, Didemnidae): a re-examination of some specimens and descriptions of three new species

Fig. 4. Polysyncraton amethysteum (Van Name, 1902), Brazil (DZUP DID-034, POSC-016; LIPY UFPB TUN-293). Structures stained with hemalum. a. Thorax, atrial languet (arrow). b. Abdomen showing the position of the testis (arrow). c–f. Larvae in Brazilian specimens from São Paulo (c) and Paraíba (d–f), different stages in the same colony (e–f). Scale bars: 0.1 mm.