6 - Sphaeromatidae::“Cute As Buttons”

internal pouch
Ancinus belizensis 205
Figure 90. Diagrammatic representation of 9 sphaeromatid, showing marsupial
structures (adapted from Harrison, 1984).
Ancinus H. Milne Edwards, 1840
DIAGNOSIS Eyes dorsal. 9 mouthparts not metamorphosed. Mandibular
molar absent; palp of three articles. Maxilla 1 of single ramus, endite rudi­
mentary. Maxilla 2 of two rami. 9 with oostegites absent; brood held in two
opposing pockets, opening as narrow ventral slit between pereopods 4. Pleon
consisting of short anterior pleonite with free lateral margin, plus broadly
triangular pleotelson. Pleopod 1 uniramous, endopod absent. Pleopod 2 op-
erculiform. Pleopod 3, exopod of single article. Uropod lacking exopod, sym-
pod not laterally expanded.
Key to species of Ancinus
1. Pleotelson as long as basal width, apex narrowly rounded . . . brasiliensis
Pleotelson with basal width greater than length, apex subtruncate
Ancinus belizensis Kensley and Schotte, 1987
Figure 91A-C
belizensis
DIAGNOSIS 8 4.1 mm, 9 2.8 mm. Body oval, about twice longer than wide.
Dorsal integument strongly pitted. Antennular flagellum of 12 articles; an-