The two species also show ecological differentiation: While the latter has papilliform
pharyngeal jaws and primarily feeds on algae, A.
shiranus shiranus (Lowe-McConnell, 1982), and the appearance of Cichlasoma minckleyi as an altricial papilliform
morph and a precocial molariform morph (Liem and Kaufman, 1984).
2A, B) has the light-guiding distal appendage (DA) divided at the base; each main branch has a bifurcated tip and two tiny papilliform
side-branches; the base is surrounded by four escal lobes of about equal size, each with a slightly roundish tip; length of the DA is 24 mm (6.
Pronotum trapezoidal, widest at posterior margin, bearing widely dispersed hair-like sensilla on margins and shorter sensilla widely distributed distally, two small sternites each with two minute spines; meso- and metanota subequal in length; papilliform
spiracle in pleural region of mesonotum near anterolateral margin of tergite.