Hymenopenaeus chacei Crosnier & Forest, 1969

Alves-Júnior, Flavio De Almeida, Araújo, Marina De Sá Leitão Câmara De & Souza-Filho, Jesser F., 2017, New records of deep-sea shrimps of family Solenoceridae Wood-Mason & Alcock, 1891 (Crustacea: Decapoda: Dendrobranchiata) from Southwestern Atlantic, Zootaxa 4254 (4), pp. 473-484 : 476-478

Hymenopenaeus chacei Crosnier & Forest, 1969

( Fig. 3 A–B)

Hymenopenaeus chacei Crosnier & Forest, 1969: 545 , fig. 1–2.— Crosnier & Forest 1973: 261, fig. 82.— Cardoso et al. 2014:51.

Material examined. 1 Female, Potiguar Basin, MT# 62, 410 m, 04° 47.83' S / 036° 11.02' W, 8 May 2011, MOUFPE: 16787. 8 individuals, 2 Males, 6 Females, Potiguar Basin, MT# 63, 416 m, 04° 36.24' S / 036° 45.75' W, 5 May 2011, MOUFPE: 16789. 2 individuals, 1 Male, 1 Female, Potiguar Basin, MT#75, 04° 28.80' S / 036° 52.55' W, 5 May 2011, MOUFPE: 16786. 1 Female, Potiguar Basin, MT#84-2, 2034 m, 04° 25.83' S / 036° 37.36' W, 5 July 2011, MOUFPE: 16791. 3 Females, Potiguar Basin, MT#85, 2068 m, 04° 21.35' S / 036° 44.27' W, 5 May 2011, MOUFPE: 16785.

Diagnosis. The rostrum, straight, is directed slightly upwards, reaching the second segment of the antennal peduncle, with 6–7 teeth on rostrum, two post-rostral teeth unequal: the posterior presents at the base of dorsal margin a very small projection, bottom edge of rostrum smooth without teeth. Four spines acute in carapace antennal, rostral, hepatic and branchiostegal. Ocular peduncle longer than the width of the cornea. Abdome with somites 4–6 dorsally carinated. (Modified by Crosnier & Forest, 1969).

Geographic distribution. ( Fig. 4 ) Western Atlantic : Brazil (Ceará and Rio Grande do Norte - First report from southwestern Atlantic) . Eastern Atlantic : Mid Atlantic Ridge, Portugal (Madeira Island) , West Sahara, Morocco, Mauritanian, Senegal, Gabon , Bissau? Guinea, Guinea, Namibia ( Crosnier & Forest 1969; 1973; Cardoso et al. 2014).

Bathymetric distribution. The specimens of H. chacei have been collected in Potiguar Basin between the depths of 410–2068 m; however, their occurrence is usually between 750–1300 m ( Crosnier & Forest 1969; 1973), thus extending its bathymetric distribution from deep waters.

Remarks. The specimens analyzed herein do not differ from the description of Crosnier & Forest (1969) and Crosnier & Forest (1973). According to Crosnier & Forest (1973), the species of Hymenopenaeus chacei belongs to the group of genus Hymenopenaeus that doesn't have the pterygostomian spine, but the branchiostegal spine in the previous region, and showing two post-rostral teeth, which is formed by H. propinquus (de Man, 1907) , H. equalis ( Bate, 1888) , H. neptunus ( Bate, 1881) , H. obliquirostris ( Bate, 1881) , H. fattahi Ramadan, 1938 , H. halli Bruce, 1966 , H. debilis Smith, 1882 and H. aphoticus Burkenroad, 1936 . The specimens collected in this study indicated a wide bathymetric distribution of species, being collected between isobaths from 400 m to 2000 m along the continental slope. The species of H. chacei has a disjunct distribution, reported only from eastern Atlantic ( Crosnier & Forest 1969; 1973) and from the Mid Atlantic Ridge reported by Cardoso et al. (2014), thus, this paper report the first occurrence of species from the southwestern Atlantic (Brazilian waters), filling gap along the Atlantic Ocean.

Figures

FIGURE 3. Hymenopenaeus chacei Crosnier & Forest, 1969. A. Male lateral view. B. B. Detail of anterior margin of the carapace: 1. Postorbital spine, 2. Antennal spine, 3. Hepatic spine, 4. Branchiostegal spine (MOUFPE: 16789). Scale bar = 1 cm.

FIGURE 4. Geographic distribution of Hymenopenaeus chacei Crosnier & Forest, 1969 in the Atlantic Ocean. Black circles = previous records; star = new record.