Stephanotheca barrosoi , Reverter-Gil, Oscar, Souto, Javier & Fernández-Pulpeiro, Eugenio, 2012

Reverter-Gil, Oscar, Souto, Javier & Fernández-Pulpeiro, Eugenio, 2012, A new genus of Lanceoporidae (Bryozoa, Cheilostomata), Zootaxa 3339, pp. 1-29: 7-11

publication ID

10.5281/zenodo.212993

persistent identifier

http://treatment.plazi.org/id/220B4B5A-B067-FFAB-0BA3-238EFF6CFE30

treatment provided by

Plazi

scientific name

Stephanotheca barrosoi
status

n. sp.

Stephanotheca barrosoi  n. sp.

( Figs 1, 6 View Figure , 9, 10 View Figure , 13–23View FIGURES 13 – 19View FIGURES 20 – 23; Table 1)

Metroperiella lepralioides (Calvet)  : Barroso 1923: 251, fig. 1.

Schizomavella ambita (Waters)  : Barroso 1935: 376, figs 4, 5.

Schizoporella ambita (Waters)  : Gautier 1957: 210 (part or whole).

Schizomavella rudis (Manzoni)  : Gautier 1962: 145 (in part: records from the Balearics). Schizomavella ochracea (Hincks)  : Hayward & Thorpe 1995: 674 (in part).

Material examined. Holotype: MNCNAbout MNCN 3829: Menorca Channel, 39 º 45 ’ 40 ’’ N, 3 º 32 ’ 16 ’’ E, 59 m, 16 /03/ 2009. Paratype # 1: MNCNAbout MNCN 3831, Menorca Channel, Patín 25, 39.9815º N, 03.7295º E, 06/09/ 2011, 60 m. Paratype # 2: MNCNAbout MNCN 3832, Menorca Channel, Patín 37, 39.9410º N, 03.6803º E, 09/09/ 2011, 63 m. Paratype # 3: MNCNAbout MNCN 3833: Menorca Channel, Patín 40, 39.9290º N, 03.7088º E, 10 /09/ 2011, 66 m. Paratype # 4: NHMUKAbout NHMUK 2012.4.23.1: Menorca Channel, Patín 27, 39.8528º N, 04.0885º E, 07/09/ 2011, 50 m. Paratype # 5: MNHNAbout MNHN IB- 2009 - 1564: Menorca Channel, Patín 38, 39.9392º N, 03.6790º E, 10 /09/ 2011, 64 m. Other Material Examined: MNHNAbout MNHN 11152: Menorca, Coll. Gautier; MNHNAbout MNHN 11189: Balearics, Coll. Gautier; MNHNAbout MNHN 11191: Balearics, Coll. Gautier; NHMUKAbout NHMUK 1899.7.1.2343, 2345: Mediterranean, Coll. McAndrew. Numerous colonies collected in the Menorca Channel, 39.9822– 39.7245º N, 03.4722– 04.1055º E, 53–76 m, 02– 12 /09/ 2011.

Etymology. The species is dedicated to Mr Manuel Gerónimo Barroso, who first studied it.

Description. Colony forming irregular crusts, multilaminar. Autozooids of polygonal irregular shape, in irregularly arranged series, separated by a fine suture on raised ridges. Frontal shield slightly convex; initially smooth, but soon covered by small blunt conical nodules. Surface evenly perforated by small, circular pseudopores; marginal areolar pores only obvious in older zooids. Nodules near the orifice form a weak lateral and proximal peristomial thickening. Primary orifice elliptical, slightly wider than long. Poster a wide, rounded V shape occupying about half width of proximal border, flanked by a pair of large condyles with serrate edges. Oral spines absent. Polypide with about 12 tentacles. One suboral avicularium, inconstant, with slender, complete crossbar, and large oval palatal foramen; mandible semi-elliptical, proximally directed. Distance to proximal border of the orifice equal to avicularium length. Vicarious avicularia infrequent, similar to autozooids in shape but slightly wider, with a presumably functional polypide with about 6 tentacles, rarely with a frontal suboral avicularium similar to that in autozooids. Orifice extremely elongated; poster a wide, rounded sinus occupying nearly all the proximal border, flanked by a pair of projecting condyles with serrated edges, larger than in autozooids. Ovicell globular, from prominent to subimmersed depending on thickness of overgrowing secondary calcification, closed by zooidal operculum; central flat circular area of ectooecium with rounded, elongate or irregular pseudopores, these larger at periphery; secondary calcification of distal zooid forming a corona of prominent conical nodules almost encircling the exposed ectooecial area, incomplete and flattened proximally; proximal ovicell rim with a fine longitudinal suture of entooecium visible through ectooecium in light microscope. Primary orifice of ovicelled zooids wider than in non-ovicelled ones, with smaller sinus; concealed by inclined ovicell opening, the lateral margins of which overarch the primary orifice, extending to its proximolateral corners. Embryos orange. Uniporous septula. Ancestrula unknown.

SD, Standard deviation; N, number of measurements.

Remarks. Stephanotheca barrosoi  n. sp. was first reported from the Balearic Islands by Barroso (1923, 1935), initially as Metroperiella lepralioides  (Calvet in Jullien & Calvet, 1903) and later as Schizomavella ambita ( Waters, 1889)  . Although Barroso’s material does not exist anymore, his descriptions and figures are clear enough as to assure it matches the present description. This species was also reported from the Balearics by Gautier (1957 as S. ambita  ; 1962 as S. rudis  ), the original samples of which we examined.

Stephanotheca barrosoi  n. sp. is the only species of the genus that has zooids with hypertrophied orifices, here considered to be ‘primitive’ or less-derived vicarious avicularia.

Two colonies reported by Hayward & Thorpe (1995) in their redescription of S. ochracea  are reported here as S. barrosoi  n. sp. Both colonies come from the Mediterranean, whereas their exact location is unknown. The sample NHMUKAbout NHMUK 1899.7.1.2345 ( Figs 14, 15 View Figure ) exhibits an orifice similar to the one in the type species as well as vicarious avicularia of the same type, but there are also slight differences — the avicularia tend to form clusters, their orifice does not have parallel lateral rims but are more slender and distally converging, and constantly show a suboral avicularium; in contrast, in the type specimen of S. barrosoi  only a single vicarious avicularium with a suboral avicularium was seen. This sample is provisionally labelled as S. barrosoi  owing to the limited amount of material available at present.

Stephanotheca barrosoi  n. sp. is known only from several stations off the Balearic Islands (Western Mediterranean).

MNCN

Museo Nacional de Ciencias Naturales

NHMUK

Natural History Museum, London

MNHN

Museum National d'Histoire Naturelle

Kingdom

Animalia

Phylum

Bryozoa

Class

Gymnolaemata

Order

Cheilostomatida

Family

Lanceoporidae

Genus

Stephanotheca

Loc

Stephanotheca barrosoi

Reverter-Gil, Oscar, Souto, Javier & Fernández-Pulpeiro, Eugenio 2012

2012
Loc

Schizomavella rudis

Hayward 1995: 674
Gautier 1962: 145

1962
Loc

Schizoporella ambita

Gautier 1957: 210

1957
Loc

Schizomavella ambita

Barroso 1935: 376

1935
Loc

Metroperiella lepralioides

Barroso 1923: 251

1923