Bryopesanser tilbrooki Winston & Vieira, 2013, sp. nov.
Creators: name: Winston, Judith E.
name: Vieira, Leandro M.
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Bryozoa
Gymnolaemata
Cheilostomatida
Escharinidae
Bryopesanser
Bryopesanser tilbrooki

description: Bryopesanser tilbrooki sp. nov.
(Fig. 20; Table 18)
Material examined. Holotype: MZUSP 744 (Fig. 20 A, C, D), measured specimen #2, BIOTA Stn 211. Paratypes: MZUSP 672, #2 [5 specimens], near BIOTA Stn 205, 15 m; MZUSP 743, Biota Stn 211; MZUSP 745 (Fig. 20 E, F), measured specimen #3, BIOTA Stn 205; VMNH 70027, BIOTA Stn 211. Additional material: MZUSP 710, BIOTA Stn 211.
Supplementary video. http://cifonauta.cebimar.usp.br/taxon/bryopesanser-tilbrooki/
Etymology. Named in honor of Kevin Tilbrook, in recognition of his contribution to the taxonomy of Bryopesanser species.
Diagnosis. Bryopesanser with multiporous frontal shield, small paired avicularia, 7 oral spines (6 in ovicelled zooids), and almost semicircular orifice with shallow, subquadrate sinus.
Description. Colonies encrusting in a single layer on small mineral or shell grains. Zooids are relatively flat, with a beaded frontal surface texture, regularly penetrated by small, irregular, multiporous pseudopores. Zooids have raised lateral edges, their margins distinct. Distal end of zooid with a flattened peristome whose shape reflects the outline of the orifice within it. Orifice almost semicircular anteriorly, with a shallow subquadrate sinus and sloping condyles with a posteriorly crimped edge. Seven long, angled and jointed hollow spines surround the distal and lateral rim of the peristome and orifice; bases of spines brown in color. Small triangular avicularia with a rounded base and a complete cross-bar occur on some zooids, lateral to the orifice, with the mandible oriented distally. Ooecium semicircular, solidly calcified, with a flattened proximal edge; ovicelled zooids with 6 oral spines. Polypides with 11 translucent white tentacles.
Remarks. The new species resembles Bryopesanser pesanseris (Smitt, 1873), also reported from the Brazilian coast (Tilbrook 2012), but differs from it in orifice shape and in the presence of a frontal shield with multiporous pseudopores. The specimens from São Paulo reported as Mastigophora pesanseris (MZUSP, unregistered specimen; Marcus collection #38) differ from Bryopesanser tilbrooki n. sp. in the shape of the orifice and sinus, and the more porous frontal wall; these specimens belong to a distinct species.
The multiporous pseudopores found in Bryopesanser tilbrooki were also reported in six other species, Bryopesanser capitaneus Tilbrook, 2006, Bryopesanser crebicolis Tilbrook, 2012, Bryopesanser grandicella (Canu & Bassler, 1929), Bryopesanser gardineri Tilbrook, 2012, Bryopesanser labiones Tilbrook, 2012 and Bryopesanser tonsillorum Tilbrook, 2012). However, Bryopesanser tilbrooki is readily distinguished from other species of the genus in having an orifice with a subquadrate sinus and well-developed condyles.
Distribution. São Paulo state, Brazil.
description: Published as part of Winston, Judith E. & Vieira, Leandro M., 2013, Systematics of interstitial encrusting bryozoans from southeastern Brazil, pp. 101-146 in Zootaxa 3710 (2) on pages 131-132, DOI: 10.11646/zootaxa.3710.2.1, http://zenodo.org/record/248125