Meningodora longisulca Kikuchi, 1985

(Figs. 19 A–C, 20)

Meningodora longisulca Kikuchi, 1985, 191, Figs. 1–3.— Kikuchi 1991: 27, fig. 2.

Material examined: 1 OF, Fernando de Noronha, Abracos 2 ST#39/ Leg. 2, Midwater Tow, 800 m, 04° 52,43’ S / 034° 3,51’ W; 04° 50,86’ S / 034° 5,11’ W, 24 April 2017, MOUFPE: 18.451. 1 F, Fernando de Noronha, Abracos 2 ST#44A/ Leg. 2, Midwater Tow, 850 m, 03° 52,21’ S / 032° 17,54 ‘ W; 03° 52,28’ S / 032° 16,45’ W, 28 April 2017, MOUPE : 18.452. 1 M and 1 F, Fernando de Noronha, Abracos 2 ST#44B/ Leg. 2, Midwater Tow, 130 m, 03° 53,32’ S / 032° 17,99’ W, 24 April 2017, MOUFPE : 18.453. 1 M, Fernando de Noronha, Abracos 2 ST#48A/ Leg. 2, Midwater Tow, 550 m, 04° 25,02’ S / 032° 57,85’ W; 04° 25,45’ S / 032° 56,89’ W, 30 April 2017, MOUFPE : 18.450.

Diagnosis: Integument thin and fragile. Rostrum triangular, slightly concave and not reaching beyond the second segment of antennular penduncle. Carapace dorsally carinate. Eyes slightly narrower than eyestalks; ocular tubercle present on inner side of stalks; tip of the eye reaches to first segment of antennular peduncle. Branchiostegal spine minute, not supported by any carina, but showing a blunt ridge. Abdomen carinate on somites 4–6. Third abdominal somite with a very faint dorsal carina; median posterior tooth present on fourth, fifth and sixth somites. Telson longer than sixth somite, deeply sulcate dorsally (Modified from Kikuchi 1985).

Distribution: Atlantic Ocean: Brazil (Fernando de Noronha Archipelago). Pacific Ocean: Philliphines Sea and off Japan (Kikuchi 1985; 1991) (Fig. 20).

Bathymetric distribution: 0–2394 m depth (Kikuchi 1985; 1991), herein this species was found in Brazilian waters in depths between 130– 850 m.

Remarks: The specimen analyzed herein agrees with the descriptions of Kikuchi (1985) based on specimens collected in Pacific Ocean. According to Kikuchi (1985), the closest species of M. longisulca is M. mollis Smith, 1882, however, these species differ from each other in the following way (character of M. mollis in parentheses): cornea of the eyes narrower than the eyestalks (Fig. 19B) (eyes much narrower than eyestalks); presence of blunt ridge which supports the branchiostegal spine (Fig. 19A) (vs. branchiostegal spine supported by a short sharp ridge or carina); presence of dorsal carina on the third abdominal somite (Fig. 19C) (vs. dorsal carina on the third abdominal somite absent). Meningodora longisulca was previously reported only from Pacific Ocean by Kikuchi (1985; 1991) (Fig. 20), being recorded in few areas along the Philippines Sea and off Japan. In this paper, we report its first occurrence in Atlantic Ocean (Brazil), with the third observation of this rare species in all world.