Sponge Peppermint Shrimp
Lysmata pederseni
To  4.5cm

Translucent body with red lateral stripes on abdomen and the side of ther carapace.
Two transverse red bands on carapace, the second at the start of the abdomen which curve away from each other. (This is its particular distinguishing characteristic from the 4[5] species now differentiated in the former L.wurdemanni complex).

Usually found as pairs within tube sponges and narrow slits of barrel sponges.

Life Cycle:
A protandric simultaneous hermaphrodite. It begins as a male but may later become a hermaphrodite. It has four moults as a male before changing sexes to become a euhermaphrodite. However, under certain conditions some males never change to hermaphrodites. In the euhermaphrodite stage the shrimp act as a male between moults and as a female immediately following a moult. During this hermaphroditic stage the shrimp gradually lose their male organs, likely because more energy is being allocated to the development of female reproductive organs.

Pairs are equally likely to comprise two hermaphrodites or one hermaphrodite and one male. Hermaphrodites tolerate other hermaphrodites but not males in their host sponge. These results suggest that pairs of hermaphroditic L. pederseni are socially monogamous; they share the same host individual and might reproduce exclusively with their host partners for long periods of time. Nevertheless, males appear less likely to establish long-term associations with hermaphrodites as indicated by the rate of their disappearance from their hosts (greater than that of hermaphrodites). Sex allocation was female biased in monogamous hermaphrodites. On average, hermaphrodites invest 34 times more to female than to male reproductive structures. Monogamy and female-biased sex allocation seem to be evolutionary consequences of adopting a symbiotic lifestyle in simultaneous hermaphrodites.

Males use aesthetascs (olfacrory organs) on their antennnules to detect female sex pheromones, which are released 2-8 hours prior to female moulting. Mating occurs immediately post-moult, while the female's cuticle is new and soft.

    Ecological Descriptors
Habitat Size (cm) Diet Behaviour Sex 
Sponges 4.5 Cle Pr PAH/SH*
Sponge Peppermint Shrimp
Sponge Peppermint Shrimp
Pedersen's Peppermint Shrimp
Previously within
Lysmata wurdemanni complex