6 - Sphaeromatidae::“Cute As Buttons”

252 VALV1FERA • ARGTUR1DAE
REMARKS Of the six families in the suborder, only two have been recorded
in the Caribbean area, the Idoteidae and the Arcturidae.
Family Arcturidae Sars, 1897
DIAGNOSIS Pereonite 1 either distinct, or completely or imcompletely fused
with cephalon. Anterior four pairs of pereopods directed anteriorly, usually
strongly setose; posterior three pairs of pereopods ambulatory, used for cling­
ing to substrate. Body often bent between pereonites 4 and 5. Uropods usu­
ally biramous, with minute endopod concealed by larger exopod. Pleonites
variously fused with pleotelson. Sexual dimorphism often marked.
REMARKS Menzies and Kruczynski (1983) described three species of
arcturids from the west coast of Florida, in depths of 55—73 m: Arcturella
spinata, Arcturella bispinata, and Edwinjoycea horologium. These species are not
covered here.
Key to genera of Arcturidae
1. Pereonite 1 not fused with cephalon; at least one free pleonite
Pereonite 1 fused with cephalon; pleonites fused with pleotelson
Astacilla Cordiner, 1793
Thermarcturus
Astacilla
DIAGNOSIS Antennae at least half length of body. Pereopod 1 with strong
terminal claw on dactylus. Pereopods 2—4 lacking dactyli. Endopod of
Key to species of Astacilla
1. Body integument lacking ornamentation cymodocea
Body integument with spines or tubercles 2
2. Pereonite 4 in 6 and 9 with strong middorsal tubercle; pairs of spines
lacking on pereonites regina
Pereonite 4 lacking strong middorsal tubercle; pairs of spines on all
pereonites lasallae