Bolosoma perezi, Castello-Branco & Collins & Hajdu, 2020

Castello-Branco, Cristiana, Collins, Allen G. & Hajdu, Eduardo, 2020, A collection of hexactinellids (Porifera) from the deep South Atlantic and North Pacific: new genus, new species and new records, PeerJ 8, pp. e 9431-e 9431 : 11-13

publication ID

https://doi.org/ 10.7717/peerj.9431

publication LSID

lsid:zoobank.org:pub:F4026A15-D26A-4312-A315-23EEE518F5D0

DOI

https://doi.org/10.5281/zenodo.4624254

persistent identifier

https://treatment.plazi.org/id/038187DB-2E11-3E52-A5D0-9CEAA9838D4D

treatment provided by

Plazi

scientific name

Bolosoma perezi
status

sp. nov.

Bolosoma perezi View in CoL sp. nov.

( Figs. 6 View Figure 6 and 7 View Figure 7 )

Type Material

Holotype. MNRJ 21955 , Rio Grande Rise, Southwest Atlantic (PROERG Expedition , ERG 15 — L 2; 31 7 ′ 3.36 ″ S / 34 1 ′ 48.72 ″ W), 1,022– 1,013 m depth, 07.VII.2011. LSID: urn:lsid:zoobank.org:act:CAD5EDB9-DB39-4684-A160-95EA2FA21210 GoogleMaps

Diagnosis

Bolosoma perezi sp. nov. is the only Bolosoma with discohexasters and codonhexasters microscleres.

EXTERNAL MORPHOLOGY. Sponge fragment, cushion-shaped and compressible, 162 mm in length × 78 mm in width × 16–27 mm in height; fragment apparently without a peduncle, color light gray in ethanol (fi g. 6).

SKELETON AND SPICULES. A few long cemented diactins (40–80 m m diameter and over 900 m m long), which we assume are fragments of a peduncle. Choanosomal diactins with rough ends and rudiments of tangential rays (1,275–3,125 × 5–8 m m). Dermal and atrial hexactins and rare atrial pentactins with rough ends and sometimes random spines along the ray (270‒830 × 5‒8 m m). Microscleres are ball-like discohexasters (70‒80 m m diameter), its derivates (stauractins, 42–50 m m diameter), and codonhexasters (155–175 m m diameter, primary rosettes 27–43 m m diameter). The last one with six primary rays and secondary rays in number of four; discs with nine teeth (fi g. 7).

DISTRIBUTION AND ECOLOGY. Known only from its type locality in the Rio Grande Rise (Southwest Atlantic), 1,022–1,013 m depth. This is the fi rst record of Bolosoma for the entire Atlantic Ocean.

ETYMOLOGY. The speci fi c epithet honors Prof. Dr. Angel Perez (UNIVALI, Brazil) for granting us access to Rio Grande Rise materials, and for our long-standing collaboration in the study of South Atlantic deep-sea ecosystems.

Remarks

Bolosoma comprises eight species (see comparative Table 1 View Table 1 ), up to now recorded only from the Paci fi c Ocean. The new species presents a unique set of spicules, indicating its distinctiveness from the remaining species in the genus. None of its congeners present the combination of delicate codonhexasters and “ball-like” discohexasters, which confers B. perezi sp. nov. obvious status as a new species. This is the fi rst record of Bolosoma for the Atlantic Ocean.

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