Brasiloniscus maculatus Cardoso & Campos-Filho & Araujo 2018, gen. et comb. nov.

Brasiloniscus maculatus (Lemos de Castro, 1973) gen. et comb. nov.

Figs 1–2, 7A

Brasiloniscus maculatus Lemos de Castro, 1973: 6, figs 3–4.

Brasiloniscus maculatus – Leistikow & Wägele 1999: 42. — Schmalfuss 2003: 57. — Schmidt & Leistikow 2004: 17.

Material examined

Paratypes

BRAZIL: 4 ♂♂, 3 ♀♀, state of São Paulo, Ilha da Vitória, 30 Mar. 1965, K. Lenko leg., on tree bark (MNRJ 6212).

Redescription

MEASUREMENTS. Maximum body length: 15 mm.

BODY. Habitus in lateral view as in Fig. 1A. Material depigmented due to long preservation in ethanol 70% (Fig. 7A). Dorsum covered by fan-shaped scale-setae and polygonal pattern scales (Fig. 1B), schisma with overlapping scales (Fig. 1C), ribs slightly developed on median and paramedian areas of pereonites, more evident on pereonites 1–5; noduli laterales 1–7 short, inserted at same distance from lateral margins and in each pereonite progressively near to posterior margin.

CEPHALON (Fig. 1D–E). Lateral lobes slightly bent upwards, frontal shield with lateral sides almost straight; eyes consisting of 20–25 ommatidia.

PEREON. Pereonite 1 epimeron with inner lobe of schisma rounded. Pereonites 2 and 3 with ventral lobes rounded, more conspicuous on pereonite 2 (Fig. 1F).

PLEON (Fig. 1G–H). Neopleura 5 not reaching distal margin of uropod protopod; telson with shallow dorsal depression, lateral sides concave.

ANTENNULA (Fig. 1I). Distal article with subapical aesthetascs.

ANTENNA (Fig. 1J–K). Fifth article of peduncle twice as long as flagellum. Flagellum with second and third articles subequal in length.

MOUTH. Mandible with molar penicil with about eight branches, left mandible (Fig. 1L) with 2+2 penicils, right mandible (Fig. 1M) with 1+1 penicils. Maxillula (Fig. 1N) inner endite bearing two hairy penicils; outer endite of 4+6 teeth, five of them with cleft apex. Maxilla (Fig. 1O) bilobate, strong suture line, outer lobe wider than inner lobe, both covered with setae. Maxilliped (Fig. 1P) palp with two long

setae on proximal article; endite subrectangular, median seta strong, surpassing distal margin, distal portion bearing many small setae.

PEREOPODS (Fig. 2A–C, J). With sparse setae on sternal margin, pereopod 1 carpus with distal seta serrate at apex and longitudinal antennal grooming brush; dactylus with inner claw not surpassing outer claw, dactylar and ungual setae simple.

UROPOD (Fig. 1G–H). Endopod about twice as long as exopod.

PLEOPOD EXOPODS. Respiratory areas as in diagnosis, exopods 1–4 with well-developed respiratory areas, reduced on exopod 5.

Male

PEREOPOD 7 (Fig. 2C). Base with lobe on distal sternal margin.

PLEOPODS. Pleopod 1 (Fig. 2D–E) exopod with deep re-entrancy on distal margin, inner margin rounded, inner and distal margin bearing setae; endopod twice as long as exopod, distal portion directed outwards with small inner lobe and narrow apex. Pleopod 2 (Fig. 2F) exopod triangular bearing setae; endopod slender, longer than exopod, reaching pleopod 4. Pleopod 3–5 exopod (Fig. 2G–I) rhomboid bearing small setae on outer margin; exopod 5 with transverse fringe of thin setae.

Remarks

Lemos de Castro (1973) mentioned the absence of respiratory area on pleopod exopods. However, the examination of the type material revealed the presence of uncovered respiratory areas in all pleopod exopods. New illustrations are provided here along with characters that were not mentioned in the original description.