Figure 2

Principle organization of the anterior body of Erugosquilla massavensis (Kossmann, 1880). Images taken under macro-fluorescence settings. A. Ventral view of a specimen, pleon removed. Four major tagmata can be distinguished as described here: I. Sensory area with segments of eyes, antennulae and antennae. II. Feeding area, with elongated posterior part of hypostome (part of hypostome-labrum-complex) and segments of mandibles, maxillulae and maxillae. III. Posterior food-processing unit with segments of maxillipeds 1-4 and the anterior region of the next segment with maxilliped 5. IV. Walking-appendage area; most parts of the segment of maxilliped 5 (except for the appendage itself) being closely associated with the next three segments carrying the walking appendages. B. Dorsal view of shield and tagma I (see A) detached from the body. Tagma I is associated with the rostral plate. It comprises the antennulae with three flagella arising in a specific pattern: Flagellum 1 arises from the most distal of the three peduncle elements. An elongated element (2 + 3) inserts adjacent to flagellum 1, which is the common base of flagellum 2 and 3. Abbreviations: I-IV = tagmata I-IV; 1-3 = antennular flagella; ant en = antennal endopod; atl = antennula; ex = exopod; hlc = hypostome-labrum-complex; md = mandible; mp = maxilliped; mx1 = maxillula; mx2 = maxilla; pgn = paragnaths; rst = rostrum.