The main taxonomic characters used to identify monstrilloids include their body shape and proportions, the antennule
length, the presence and development of the eyes, the position of the oral papilla, and the number of caudal setae, this last being one of the genus-defining features (Suarez-Morales 2011, 2015).
1B), 2) fourth segment of female antennule
less than twice as long as wide (Fig.
Partially dissected material--habitus, right antennule
, labrum, and P5 of Leptocaris colombiana sp.
(Figure 2A) 8-segmented; armature formula: 1(1), 2(9), 3(7), 4(2+ (1+ae)), 5(2), 6(3), 7(4), 8(5+acrotek).
lividus References Cuesta & Shubart (1999) Carapace RDL (mm) 0.75 [+ or -] 0.03 CW (mm) 0.32 [+ or -] 0.01 CL (mm) 0.42 [+ or -] 0.02 Antennule
2A, 1S Antenna Small spines in protopod 6-7 Maxilliped 1 Coxa (S) nd Telson Outer spines 3 Pleon Dorsolateral processes (P) 2-4 G.
, antenna, maxillule, mandible, maxilla, maxilliped, and first leg were at the cephalothorax.
is considered the organ most specialized for chemosensory detection and plays a leading role in tracking odor plumes  and individual recognition .
dubia in characters related to antennule
length compared to body length, but mainly to the shape and relative size of the genital double somite and other urosomal somites.
Olfactory responses of lobsters (Homarus americanus) to solutions from prey species and to seawater extracts and chemical fractions of fish muscle and effects of antennule
Sensory papilla of antennule
with nine aesthetascs, one of them larger, seven more subequal and one smaller.
Morphometrics.--Eight characters (body length, body width, eye diameter, rostrum width, length of flagellum on antennule
, length of flagellum on antenna, length of last peduncular article on antenna, and length of uropodal exopod) were measured on an approximately equal number of males and females in each of the two sampled years; sample sizes ranged from 10 to 34 per beach (Lessios et al.
; aa: antenna; ma: maxilla; md: maxilliped; me: maxillule; os: oral sucker; ro: rostrum; (D) Adult male, dorsal view.