6 - Sphaeromatidae::“Cute As Buttons”

Gnathia beethoveni Paul and Menzies, 1971
Figure 103 A
Gnathia magdalenensis 239
DIAGNOSIS 6 3.0 mm. Anterior margin of cephalon with two low tubercles
flanking shallow medial notch plus slightly larger pair of lateral tubercles.
Cephalon lacking dorsal tubercles. Pereonite 5 1.5 times wider than middor-
sal length. Uropodal endopods reaching beyond telsonic apex.
RECORDS Off Venezuela, 95 m. Colombia.
Gnathia gonzalezi Miiller, 1988
Figure 103B
DIAGNOSIS 6 2.0 mm. Body smooth. Anterior margin of cephalon concave.
Pereonites 3—5 distinct; pereonite 5 2.5 times wider than middorsal length.
Cutting margin of mandible with four or five low rounded teeth.
RECORDS Colombia, 30 m.
Gnathia Johanna Monod, 1926
Figure 103C
DIAGNOSIS 8 2.1 mm. Anterior margin of cephalon medially convex be­
tween pair of submedian tubercles. Pereonites 4 and 5 poorly separated.
Proximomedial lobe of mandible having four or five rounded crenulations,
with tiny seta between adjacent crenulations.
RECORDS U.S. Virgin Islands, 29-46 m; Colombia.
Gnathia magdalenensis Miiller, 1988
Figure 103D
DIAGNOSIS 6 3.0 mm. Anterior margin of cephalon with three tubercles,
median tubercle slightly shorter than submedian pair. Cephalon with few
scattered low granulations dorsally. Pereonite 5 about 1.5 times wider than
middorsal length. Proximomedial lobe of mandible entire.
RECORDS Carrie Bow Cay, Belize, intertidal; Colombia, 18 m.