Hymenopenaeus laevis ( Bate, 1881 )

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 : 478-480

Hymenopenaeus laevis ( Bate, 1881)

( Fig. 5 A–B)

Haliporus laevis Bate, 1881:185 .— Bate 1888:289, pI. 42, fig. 2.— Bouvier 1906:3; 1908:80. Hymenopenaeus microps Smith, 1884:413 , pI. 10.— Smith 1886:189; 1887:688 pI. 16, fig. 8.—Wood-Mason 1891:277.— Wood-Mason & Alcock 1891:188.

Hymenopenaeus laevis Burkenroad, 1936:106 ; 1938:61.— Crosnier & Forest 1973:253, fig. 82a, 83b.

Material examined. 1 Female, Potiguar Basin, MT#75, 1110 m, 04° 45.93' S / 036° 8.04' W, 20 May 2011, MOUFPE: 16784.

Diagnosis. Rostrum short, its length about 0.2 that of carapace, falling short of distal margin of first antennular article, horizontal or slightly upturned, tapering to very sharp tip, and with ventral margin slightly sinuous, eye with ocular peduncle long. Between 7–9 rostral teeth including epigastric spine. Adrostral carina low and sharp, extending from orbital margin almost to apex of rostrum; orbital margin projecting anteroventrally in narrow shelf. Postrostral carina well defined to near posterior margin of carapace, followed by small tubercle. Pterygostomian spine small, and branchiostegal, and pterygostomian spines continuous with sharp basal carina. Cervical carina sharp, notched dorsal to hepatic spine; cervical sulcus deep, extending to, but not crossing postrostral carina. First pereopod extending to about distal end of carpocerite, second pereopod reaching distal end of antennular peduncle, or exceeding it by as much as length of dactyl. Abdomen with middorsal carina from fourth through sixth somites, posterodorsal margin of fourth and fifth with short median incision, sometimes bearing minute spine at base; sixth somite about twice as long as high, armed with small, sharp spine at posterior end of carina and pair of posteroventral spines. Telson with median sulcus deep anteriorly, increasingly shallower posteriorly to level of base of lateral spines, flanked by paired ridges, blunt anteriorly, sharp posteriorly (Modified from Pérez-Farfante 1977).

Geographic distribution. ( Fig. 6 ) Western Atlantic : United States (Massachusetts, Georges Bank) , Bahamas, Bermudas and Brazil: Rio Grande do Norte (First report from southwestern Atlantic ) . Eastern Atlantic: Mid Atlantic Ridge, Mauritania , Senegal, Equatorial Guinea, Sierra Leone, Cameroon, Liberia. Indo-West Pacific: Arabian Sea ( Laccadive Sea), Bay of Bengal, Andaman Islands , Philippines ( Bate 1881; Smith 1884; Wood-Mason & Alcock 1891; Burkenroad 1936; Pérez-Farfante 1977; Crosnier & Forest 1973; Cardoso et al. 2014).

Bathymetric distribution. The specimen of H. laevis has been collected in Potiguar Basin at depth of 1,110 m; however, their occurrence is usually between 1,657–4,792 m ( Bate 1881; Smith 1884; Wood-Mason & Alcock 1891; Burkenroad 1936; Pérez-Farfante 1977; Crosnier & Forest 1973), thus extending its upper limit of bathymetric range.

Remarks. The specimens analyzed herein do not differ from the description of Pérez Farfante (1977) and Crosnier & Forest (1973). The species of H. laevis belongs to complex genus Hymenopenaeus , which according to Pérez Farfante (1977) is composed by H. laevis from Atlantic Ocean, H. doris ( Faxon, 1893) and H. nereus ( Faxon, 1893) from American Pacific and H. sewelli Ramadan, 1938 from Indo-West Pacific. These species have both branchiostegal and pterygostomian spines, distinguish of others species of genus. Hymenopenaeus laevis is cosmopolitan, occurring in Atlantic, Indic and Pacific Oceans. However, despite the records for the Atlantic Ocean, this species has never been previously registered in the southwestern Atlantic (Brazilian waters), probably due to the low sampling effort in deep-waters along the Brazilian coast. Thus, the present paper indicates the first record of H. laevis from Brazil, filling gap along the Atlantic Ocean.

Figures

FIGURE 5. Hymenopenaeus laevis (Spence Bate, 1881). A. Female lateral view. B. Detail of anterior margin of the carapace: 1. Postorbital spine, 2. Antennal spine, 3. Hepatic spine, 4. Branchiostegal spine, 5. Pterygostomian spine (MOUFPE: 16784). Scale bar = 1 cm.

FIGURE 6. Geographic distribution of Hymenopenaeus laevis (Spence Bate, 1881) in the world. Black circles = previous records; star = new record.