Rhynchactis sp.
- Dataset
- Deep-sea anglerfishes (Lophiiformes: Ceratioidei) from off northeastern Brazil, with remarks on the ceratioids reported from the Brazilian Exclusive Economic Zone
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Chordata
- order
- Lophiiformes
- family
- Gigantactinidae
- genus
- Rhynchactis
- species
- Rhynchactis spec.
description
(Figs. 5, 6 B) Geographical distribution. Two specimens were collected off Rio Grande do Norte State and Fernando de Noronha Archipelago between depths of 650 and 800 m (Fig. 5). As discussed below, they could not be identified to species, but represent the first record of the genus in Brazilian waters.
discussion
Remarks. Of the three valid species of Rhynchactis, two occur in the Atlantic: Rhynchactis leptonema Regan, 1925 and Rhynchactis macrothrix Bertelsen & Pietsch, 1998 (Pietsch, 2009). Both species are poorly represented in collections and their geographic distributions are poorly known (Pietsch, 2009). Rhynchactis leptonema has been collected in a few localities of the Atlantic and Pacific (off Hawaii and Taiwan). In the Atlantic, it is known from the holotype collected in the western Tropical Atlantic (ZMUC P 92133, 8 º 19 ’ N 44 º 35 ’ W). Rhynchactis macrothrix is also known from widely spread localities in the Atlantic and the western Indian and western Pacific Oceans. In the Atlantic, it is known from three specimens: the holotype collected in central equatorial waters (ISH 605 / 74, 7 º 55 ’ N 32 º 41 ’ W), and two specimens collected off Bermuda and in the Gulf of Mexico (Bertelsen, Pietsch, 1998; Pietsch, 2009). The larger specimen reported here (NPM 4425, 113 mm SL; Fig. 6 B) is in overall good condition but while it retains the full length of the illicium, the skin of the structure has been lost. The illicium length (208 % SL) clearly indicates that it is not R. leptonema (maximum 177 % SL; Bertelsen et al., 1981), being more similar in that respect to R. microthrix (210 % SL; Bertelsen, Pietsch, 1998). The smaller specimen (NPM 5014) is an unidentified juvenile.
materials_examined
Material examined. NPM 4425, 1, 113 mm (Fig. 6 B), RV Antea, sta. AB 2 / 42 A, 3 ° 15 ’ 28.1 ” S 31 ° 48 ’ 29.1 ” W to 3 ° 15 ’ 27.8 ” S 31 ° 50 ’ 40.6 ” W, 780 m, 27 Apr 2017, 12: 23 – 12: 26 h; NPM 5014, 1, 42 mm, RV Antea, sta. AB 2 / 39, 4 ° 52 ’ 26.9 ” S 34 ° 35 ’ 22.9 ” W to 4 ° 50 ’ 52.8 ” S 34 ° 51 ’ 04.7 ” W, 650 – 800 m, 24 Apr 2017, 21: 49 – 22: 37 h.
Name
- Homonyms
- Rhynchactis sp.