Everyone would know what a carton of eggs are… Egg sacs are similar except without the carton, although they are contained within a pounch. An egg sac describes a hollow, flexible structure resembling a bag or pouch. It is a term often used to describe the eggs of spiders contained within a sac, but also can refer to eggs of other insects.
Origin of the word – from mid 18th century (as a term in biology): from French sac or Latin saccus ‘sack, bag’.
Wolf Spider (Venatrix arenaris) with egg sac, Simpsons Gap, NTCave spider sac, that contains the spiders eggs, TasmaniaEgg sac of the Australian Golden Orb Weaver Spider (Trichonephila edulis), Alice Springs NTLong-tailed St. Andrews Cross Spider (Argiope protensa) with egg sac, Alice Springs, NTEgg sac of the Banded Garden Spider (Argiope trifasciata), Alice Springs NTFemale Redback Spider (Latrodectus hasselti) with egg sac, Alice Springs NTDesert Huntsman (Isopedella inola) with egg sac, Alice Springs Desert Park NTEmpty silken case of a spider (spider egg sac), Alice Springs NT
Ootheca describes a egg capsule made by some mantises, and cockroaches. It can be foam-like in structure, that will harden into a firm, protective casing.
Pictured is a Johnrehnia, genus (Blattellidae family) or possibly an undescribed related genus) cockroach with the ootheca (egg-case).
Johnrehnia, genus (Blattellidae family), Alice Springs NT
Following is the Caper White Butterfly (Belenois java teutonia) and her eggs.
Caper White Butterfly (Belenois java teutonia) laying their eggs on the Caper Bush (Capparis spinosa var. nummularia), Alice Springs, NTAnt surveying the eggs of Caper White Butterfly (Belenois java teutonia), Alice Springs NTAnts surveying the eggs of Caper White Butterfly (Belenois java teutonia), Alice Springs NT
The following mantis ootheca (containing the eggs) was on a caper bush, the host plant for the Belenois java teutonia instars and chrysalis.
Belenois java teutonia instars and chrysalis on an ootheca (family Mantidae) of a mantis species, Alice Springs NT
