Slugs live on land and in saltwater, and one genus, Acochlidium, lives in freshwater. The unadorned word slug, however, is applied primarily to land slugs, whereas slugs from the sea or from fresh water are usually referred to as  sea slugs  or freshwater slugs.f the six orders of Pulmonata, two â the Onchidiacea and Soleolifera â solely comprise slugs. A third family, the Sigmurethra, contains various clades of snails, semi-slugs (i.e. snails whose shells are too small for them to retract fully into) and slugs.
Vulva is the external parts of the female genitalia. The external opening to a woman's vagina or reproductive track is an example of the vulva. vulva. pl. vulva.
The vulval vestibule (or vulvar vestibule) is a part of the vulva between the labia minora into which the urethral opening and the vaginal opening open.Its edge is marked by Hart's line. It represents lower end of urogenital sinus from stage of embryo.he external urethral orifice (orificium urethrae urethrÃ¦; externum urinary) meatus is placed about.28 5 mm behind the glans clitoridis and immediately in front of that of the; vagina it usually assumes the form of a, short sagittal cleft with slightly raised. Margins nearby are the openings of The'skene s. ducts