6 - Sphaeromatidae::“Cute As Buttons”

Exosphaeroma yucatanum 231
terior area; posterior margin subtruncate to very faintly emarginate. Uropo­
dal exopod distally crenulate, length slightly more than twice greatest width;
endopod with faint distal notch.
RECORDS Montego Bay, Jamaica.
REMARKS The single ovigerous female holotype is the only known specimen
of this species. The overlapping oostegites suggest that this may not be an
Exosphaeroma.
Exosphaeroma diminuta Menzies and Frankenberg, 1966
Figure 100G-I
DIAGNOSIS 8 2.2 mm. Frontal lamina widest at midlength, anteriorly
truncate-rounded. Pleotelson with posterior margin broadly rounded.
Uropodal rami not quite reaching pleotelsonic apex; exopod margin distally
crenulate.
RECORDS Chesapeake Bay to Florida; Venezuela; sand dwelling, intertidal
and shallow subtidal.
Exosphaeroma productatelson Menzies and Glynn, 1968
Figure 100J-L
DIAGNOSIS 6 2.5 mm, 9 1.5 mm. Sexes essentially similar. Frontal lamina
widest at midlength, where slight shoulder apparent, anteriorly broadly
rounded, 1.6 times longer than wide. Pleotelson unornamented, anteriorly
inflated, posterior margin entire, evenly convex. Uropodal exopod distally
shallowly serrate, almost four times longer than wide; endopod wider than
exopod. Broad lateral patches of pigment on pleotelson in both sexes.
RECORDS Puerto Rico, intertidal to 0,5 m, in algae on rocks; Texas, Gulf of
Mexico.
Exosphaeroma yucatanum (Richardson, 1901)
Figure 100M
DIAGNOSIS Frontal lamina anteriorly tapering from widest point to sub­
acute apex, proximally narrower than at midlength. Pleotelson posteriorly
obscurely trilobed, median lobe narrowly rounded, longest; three low
rounded tubercles on pleotelson in anterior region.