Body (excluding appendages)
Up to 11mm long. Translucent greenish white with distinctly visible internal, green to olive brown, many branched, dendritic, digestive gland [image 1]. Dorsal anus to anterior of pericardium.
Cerata arranged in up to eight groups of 2-4, the larger ones in each group positioned more dorsally than the small ones (Seaslugforum). Surface smooth. Cerata often conceal much of body. Transparent, revealing branched, green to olive-brown, internal digestive gland extending to the apex, which lacks cnidosac. Colour of digestive gland fades to yellowish-brown if starved. Many white pigment spots on surface. Number and size of cerata varies with diet.
Enrolled tube, slit along anterior (when held upright). Smooth, greenish translucent white, with spots of white pigment, most concentrated distally (Seaslugforum). Distinctly visible internal green dendritic digestive gland.
Greenish white with green dendritic digestive gland. Eye at base of, and to side of, rhinophore.
Sole translucent greenish-white showing spheroids of ovotestis . Anterior smoothly rounded with no central indentation,no propodial tentacles and only a slight lateral expansion. Can extend beyond posterior of cerata; total length of animal about 8 times width of foot.
Key identification features
- Body translucent whitish with dendritic green markings .
- Rhinophore enrolled, widely slit open down anterior, with dendritic green markings.
- Length about 8X foot width when fully extended.
In a study in Oregon, USA, P. dendritica on Codium spp. were generally smaller than those on Bryopsis corticulans, and, when similar sized individuals were compared, those on Codium had more numerous and shorter cerata, wider bodies and smaller more numerous radular teeth than those on Bryopsis. Diet changes induced morphological changes (Trowbridge).
Simultaneous hermaphrodite. Spawn in a coil of about one and a half turns , with up to 850 ova, deposited May-June on Codium. Shelled veligers drift as plankton before transforming into adults.