6 - Sphaeromatidae::“Cute As Buttons”

210 FLABELLIFERA • SPHAEROMATIDAE
Paraleptosphaeroma glynni Buss and Iverson, 1981
Figure 92F
DIAGNOSIS 6 2.58 mm, ovigerous 9 2.38 mm. Pleotelson basally broad,
tapering to notched posterior margin. Fused uropodal endopod and sympod
of each side almost touching posterior to pleotelsonic apex.
RECORDS Portsmouth, Dominica, intertidal rock pools.
Punta Paitilla, Pacific Panama.
REMARKS Buss and Iverson (1981) demonstrated that this species displays
sequential protogynous hermaphroditism, and that the change from female
to male seems to be mediated by social conditions, especially the proportion
of males to females. The principal food source for this species was shown to
be abascan bryozoans.
Key to genera of Dynameninae
1. Pleotelson very similar in both sexes 2
Pleotelson showing marked sexual dimorphism 3
2. Cephalon and pleotelson smooth, lacking ridges Ischyromene
Pleotelson and cephalon with ridges Cerceis
3. Uropods lamellar in both sexes 4
Uropods lamellar in 9, endopod reduced, exopod elongate-cylindrical
in 6 5
4. Ovigerous 9 lacking oostegites;