Porella tenuis ( Calvet, 1906 )

Ramalho, Laís V., López-Fé, Carlos M., Mateo-Ramírez, Angel & Rueda, José Luis, 2020, Bryozoa from deep-sea habitats of the northern Gulf of Cádiz (Northeastern Atlantic), Zootaxa 4768 (4), pp. 451-478 : 464-465

publication ID

https://doi.org/ 10.11646/zootaxa.4768.4.1

publication LSID

lsid:zoobank.org:pub:341C80B1-AE7A-46A9-AEC6-EE11CD1E3106

DOI

https://doi.org/10.5281/zenodo.3794579

persistent identifier

https://treatment.plazi.org/id/03C8879D-FFDB-FFA6-5887-F9D8FB2E588E

treatment provided by

Plazi

scientific name

Porella tenuis ( Calvet, 1906 )
status

 

Porella tenuis ( Calvet, 1906) View in CoL

( Figs 4 View FIGURE 4 C–G; 5A, B; Table 6)

Palmicellaria tenuis Calvet, 1906: 431 , pl. XXVIII, figs 7, 8.

Palmicellaria skenei tenuis: d’Hondt 1974: 18 .

Material examined. MNCN 25.03 View Materials /4202: DA05, Gazul MV, 418–422 m depth, 22 June 2010 , INDEMARES CHI- CA Project, IEO coll., no information on the original substrate; MNCN 25.03 View Materials /4203: BT26, Almazán MV, 930–940 m depth, 4 March 2011 , INDEMARES CHICA Project, IEO coll., no information on the original substrate; MNCN 25.03 View Materials /4204: BT06, Chica MVD, 660–667 m depth, 19 February 2011 , INDEMARES CHICA Project, IEO coll., on MDACs.

Description. Erect colony with cylindrical branches and zooids opening only on the frontal side ( Fig. 4C View FIGURE 4 ). Autozooids elongate, arranged in two or three longitudinal alternated series, orifices from the outer zooids facing away from the branch midline ( Fig. 4C, D View FIGURE 4 ); frontal shield smooth or slightly nodular, imperforate except for scattered, rounded marginal areolar pores varying in size; sometimes a row of smaller rounded pores at the base of the peristome; on some zooids a small avicularium replacing an areolar pore ( Fig. 4D View FIGURE 4 ). Peristome well developed, hiding the primary orifice and forming three tapered, cylindrical umbones (one median and two lateral) with nodular surface, and three inner avicularia placed at the base of each umbo ( Fig. 4D, E View FIGURE 4 ): the median avicularium wider than long and larger than lateral ones, directed upwards and outwards ( Fig. 4E View FIGURE 4 ). Primary orifice wider than long, with a wide and short lyrula at its proximal border ( Fig. 4F View FIGURE 4 ). All avicularia (frontal, peristomial and distal) circular to oval, small, rostrum with serrate border and complete, thick crossbar ( Fig. 4D, E, G View FIGURE 4 ). Ovicell slightly wider than long, globular, with a smooth surface and two, rounded to elliptical pores near the proximal border; becoming immersed with secondary calcification ( Fig. 4G View FIGURE 4 ); opening inside the peristome but not closed by the zooidal operculum. On the abfrontal side: several scattered small and rounded pores, more frequently near the sutures; avicularia (similar in size and shape to those on the frontal side) placed near the sutures as well, directed randomly ( Fig. 5A, B View FIGURE 5 ).

Remarks. Porella tenuis has been described by Calvet (1906) from Cape Spartel (Gulf of Cádiz), occurring at 717 meters depth as Palmicellaria tenuis . Subsequently, d’Hondt (1974) recorded this species from the Gulf of Gascogne (North Atlantic) (as Palmicellaria skenei subspecies tenuis ). Souto et al. (2016), while describing a new species of Porella , P. biserialis , had the opportunity to examine the type-material of Palmicellaria tenuis (MNHN 419) and transferred P. tenuis to the genus Porella . These authors suggested that P. tenuis fits better in the family Bryocryptellidae instead of Celleporidae , indicating features that are distinctive between the two species: P. biserialis has branches with two longitudinal series of zooids but lacks a lyrula, peristomial umbo, and avicularia on the ovicellate zooids. Comparing the specimens of this study with the holotype of Porella tenuis some differences were detected: the holotype shows three or four latero-peristomial umbones (our specimens have three umbones, one suboral plus one on each side), and the avicularia inside the peristome are not constant (three avicularia always present in our specimens). Nevertheless, d’Hondt (1974) mentioned that these characters can be very variable within and between colonies. The material studied here consisted of fragmented colonies suggesting that variability may be lost. Thus, we maintain these specimens as Porella tenuis .

Habitat and associated species. This species occurs in fine sand and sandy mud with MDAC and coral rubble, L. phalangium , sponges [ T. muricata and Pheronema carpenteri (Thomson) ], M. oculata and some soft bottom octocorals ( Isidella elongata (Esper) , Radicipes cf. fragilis ) and small gorgonians ( Swiftia sp.).

MV

University of Montana Museum

CA

Chicago Academy of Sciences

Kingdom

Animalia

Phylum

Bryozoa

Class

Gymnolaemata

Order

Cheilostomatida

Family

Bryocryptellidae

Genus

Porella

Loc

Porella tenuis ( Calvet, 1906 )

Ramalho, Laís V., López-Fé, Carlos M., Mateo-Ramírez, Angel & Rueda, José Luis 2020
2020
Loc

Palmicellaria skenei tenuis: d’Hondt 1974: 18

d'Hondt, J. - L. 1974: 18
1974
Loc

Palmicellaria tenuis

Calvet, L. 1906: 431
1906
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