6 - Sphaeromatidae::“Cute As Buttons”

Colopisthus parvus Richardson, 1902
Figure 66A
Eurydice convex a 147
DIAGNOSIS 9 3.6 mm. Eyes large, well pigmented. Frontal lamina prox-
imally narrow, anteriorly widened to truncate distal margin. Antennules and
antennae short, latter reaching posteriorly to pereonite 1. Pleotelson with
strong middorsal ridge.
RECORDS Bermuda; Puerto Rico, intertidal rocks and algae.
Eurydice Leach, 1815
DIAGNOSIS Antennular peduncle article 2 at right angle to article 1. Anten-
nal peduncle of four articles. Frontal lamina usually slender; clypeus usually
a ventrally directed triangular blade. Maxillipedal endite reduced, lacking
coupling hooks. 6 pleopod 2 with copulatory stylet articulating at mid-
length. Pleopod 5, endopod lacking marginal setae. Pleonite 5 with free lat­
eral margins, not overlapped by pleonite 4. Uropodal sympod not produced
along medial margin of endopod.
Key to species of Eurydice
1. Frontal lamina distally truncate to faintly bilobed 2
Frontal lamina lanceolate, distally acute personata
2. Posterior margin of pleotelson between notches rounded, with four
moderate spines convexa
Posterior margin of pleotelson between notches almost straight, with
four very short spines and several elongate setae piperata
Eurydice convexa Richardson, 1900
Figures 66B-E, 67A,B
DIAGNOSIS 6 6.1 mm, 9 6.1 mm. Frontal lamina slender, anteriorly widen­
ing slightly and becoming truncate to faintly bilobed. Posterior margin of
pleotelson between lateral notches convex, with four spines and few setae
between serrations; spines between three and four times longer than wide. 6:
Plicate process on antennal flagellar articles about l /s length of article.
Pleopod 2 with copulatory stylet distally blunt, reaching well beyond rami.