Collarina macaronensis Harmelin, 2019

Harmelin, Jean-Georges, Bishop, John D. D., Madurell, Teresa, Souto, Javier, Spencer Jones, Mary E. & Zabala, Mikel, 2019, Unexpected diversity of the genus Collarina Jullien, 1886 (Bryozoa, Cheilostomatida) in the NE Atlantic-Mediterranean region: new species and reappraisal of C. balzaci (Audouin, 1826) and C. fayalensis Harmelin, 1978, Zoosystema 41 (21), pp. 385-418 : 402-404

publication ID

https://doi.org/ 10.5252/zoosystema2019v41a21

publication LSID

lsid:zoobank.org:pub:urn:lsid:zoobank.org:pub:034A7358-CF99-4908-B047-557074A2E58E

DOI

https://doi.org/10.5281/zenodo.3729356

persistent identifier

https://treatment.plazi.org/id/71F62CA0-B1DB-4F12-8646-89F8FFE02477

taxon LSID

lsid:zoobank.org:act:71F62CA0-B1DB-4F12-8646-89F8FFE02477

treatment provided by

Felipe

scientific name

Collarina macaronensis Harmelin
status

n. sp.

Collarina macaronensis Harmelin   , n. sp. ( Figs 8B View FIG ; 12; 15C; E; 17A, C; 18E; Tables 1-3 View TABLE View TABLE View TABLE )

urn:lsid:zoobank.org:act:71F62CA0-B1DB-4F12-8646-89F8FFE02477

Cribrilina balzaci   – Waters 1899: 9, figs 31-32. — Norman 1903: 98, pl. 9, fig. 6; 1909: 292.

Collarina balzaci   – Harmelin 1978a (in part): 189, fig. 8 (not pl. I, fig. 7).

Cribrilina punctata   – Fernández Pulpeiro & Rodriguez Babio 1980: 136, fig. 2. — Álvarez 1988: 348, fig. 3B-D.

Collarina fayalensis   – Arístegui 1984 (in part): 230, fig. 49b, pl. 11, fig. 6 (not fig. 7).

TYPE LOCALITY. — Portugal, Madeira, Porto Santo, Baixo Is   .

TYPE MATERIAL. — Holotype. Portugal, Madeira, Porto Santo, Baixo Is., R / V Jean-Charcot, ZARCO 1966 St. 23, 33°0’32”N, 16°23’13”W, 5-8 m, dark tunnel, 1 large ovicelled colony (> 1000 zooids) on a pebble, MNHN-IB-2014-1924. GoogleMaps  

Paratypes. Same origin as the holotype: MNHN-IB- 2014-1925: 2 colonies together with the holotype.   MNHN-IB-2014-1926: 4 colonies on 2 pebbles.   MNHN-IB-2014-1927: coated ovicelled colony for SEM examination   .

OTHER MATERIAL EXAMINED. — Azores, Faial, Castelo Branco, R/V Jean-Charcot, BIAÇORES 1971 St. P.11, 38°31’12”N, 28°42’7”W, 5-7 m, 12.X.1971, coll. by H. Zibrowius, MNHN-IB-2008-7909: 2 colonies on pebble together with holotype and paratypes of C. fayalensis   . GoogleMaps   Galicia, Sisargas Is., 43°21’22”N, 8°50’17”W, depth unknown, coll. by Fernández-Pulpeiro & Reverter leg., 1 colony ( SEM photos), MHNUSC-Bry-662. GoogleMaps   Material from NHMUK collections, SEM photos ( MSJ): NHMUK 1899.7.1.1344 ( Collarina balzaci   ), Madeira, J. Y. Johnson leg., ovicelled colony; NHMUK 1899.7.1.2419 ( Collarina   sp.), Madeira, J. Y. Johnson leg., ovicelled colony; NHMUK 1899.7.1.2105 ( Collarina   sp.), Madeira, J. Y. Johnson leg., ovicelled colony. 3d; NHMUK 1911.10.1.705 ( Collarina balzaci   ), Madeira, ovicelled colony   .

ETYMOLOGY. — From Macaronesia, biogeographical area including the Canary Islands, Madeira and the Azores where this species was recorded.

DIAGNOSIS. — Colonies medium- to large-sized; autozooids with broad marginal gymnocyst, costate shield with a lower central area, predominantly composed of 6-7 costae with smooth surface and long basal part; apertural bar moderately raised, forming an arch; proximal edge of orifice smooth and slightly concave; 3-4 oral spines; paired adventitious avicularia with marked disto-lateral orientation; ooecium formed by distal kenozooid or autozooid; ancestrula with 6 spines.

DESCRIPTION

Colony encrusting, pluriserial, unilaminar, reaching large size (> 1000 zooids) ( Fig. 18E View FIG ). Zooids subpentagonal with distal edge rounded. Gymnocyst visible in frontal view, of variable width laterally, clearly much wider in the proximal part, with some gymnocystal pseudopores ( Fig. 8B View FIG ; 12C, H). Costate shield with central part lower than the periphery, composed of 4-9 (6-7:> 60%) short and thick costae, with each ascending basal part forming a clearly distinct lobe, prominent on the gymnocyst and bearing a large pelma, a second, smaller pelma in inner position, before the central, lower part of the shield. Intercostal lacunae 2-3 between adjacent costae, small, irregularly slot-shaped ( Fig. 12 View FIG D-H). Apertural bar arched below the orifice, with a moderately raised tip, a pair of medium-sized pseudopores on both sides of the tip and two larger lateral pelmata, near the base of the avicularia ( Figs 8B View FIG ; 12F, G; 15C). Adventitious avicularia typically directed laterodistally, almost always paired, rostrum with slightly hooked tip ( Figs 8B View FIG ; 12B, D, H; 15C), nested cystids relatively frequent ( Fig. 17A, C View FIG ). Orifice wider than long, dimorphic, broader in ovicelled zooids; proximal edge slightly or noticeably concave; condyles triangular, moderately prominent ( Figs 8B View FIG ; 12D, F, G). Spines thin, with small conical base, 3 in most cases or 4, 2 arched in ovicelled zooids ( Fig. 12B, D, F View FIG ). Ovicell prominent, seemingly acleithral ( Fig. 15C View FIG ); ooecium formed by a distal kenozooid at the colony growing edge or by a distal daughter autozooid ( Figs 12 View FIG A-C; 15C, E), slightly broader than long, ectooecium with relatively smooth surface, punctured with a dozen medium-sized pseudopores. Ancestrula cribrimorph, with small spinocyst and 6 spines.

REMARKS

Collarina macaronensis Harmelin   , n. sp. is closely related to C. fayalensis   in having orifices with a concave proximal edge, costae with similarly shaped ascending base bearing a large pelma and well-developed gymnocyst. However, in C. macaronensis Harmelin   , n. sp., the paired adventitious avicularia are more distinctly directed disto-laterally and the costate shield involves more costae. Specimens from Faial, Azores recorded and figured as Collarina balzaci   by Harmelin (1978a: fig. 8; reproduced here: fig 12E) present these typical characters and belong undoubtedly to C. macaronensis Harmelin   , n. sp. This Azorean sample consisted in two colonies on a pebble bearing also the type series of C. fayalensis   . The co-occurrence of these two species on the same small substrate confirms they are not ecomorphs of the same species. The discriminant features of C. macaronensis Harmelin   , n. sp. are recognizable in part of the figured material from Canary Islands ascribed to C. fayalensis   by Arístegui (1984: fig. 49b; pl. 11, fig. 6) and also in figures of colonies ascribed to Cribrilina punctata   by Fernández Pulpeiro & Rodriguez Babio (1980: Galicia, Ria de Vigo) and Álvarez (1988: Basque region). SEM examination of specimens from Sisargas Islands, Galicia (coll. by Fernández Pulpeiro, courtesy of O. Reverter) confirmed the occurrence of C. macaronensis Harmelin   , n. sp. on the Iberian coast ( Fig. 12H View FIG ).

SEM examination of three specimens kept at the NHMUK, collected by J. Y. Johnson at Madeira and labelled Collarina balzaci   or Collarina   sp., has proved that they belong to C. macaronensis Harmelin   , n. sp. ( Fig. 12A, B View FIG ). As indicated by Norman (1909) in his introduction the Johnson collection was examined by G. Busk, Waters (1899) and himself. Waters (1899) ascribed this material to Cribrilina balzaci   and noted thereafter ( Waters 1923) that “There are specimens from Madeira, which I took for balzaci   , which must perhaps be considered a variety”. The figure of the spinocyst edge of a Madeiran specimen named Cribrilina balzaci   by Norman (1903: pl. 9, fig. 6; same specimen shown here as Fig. 12C View FIG ) shows costae with basal parts protruding greatly from the gymnocyst, a typical character of C. macaronensis Harmelin   , n. sp.

Habitat and geographical distribution

In both the Azores and Madeira C. macaronensis Harmelin   , n. sp. was found on pebbles and cobbles in shaded conditions ( Fig. 18E View FIG ). On the other hand, its absence on rocky walls of dark caves at Madeira despite an extensive sampling survey ( JGH, September 2000) suggests that this habitat is unsuitable to this Collarina   species, in contrast to several Cribrilaria   species which were very abundant ( JGH, unpublished data). Small substrates in contact with a flat bottom at shallow depth may be an ecological requirement of this species. It is worth noting that this species was noticed by Norman (1909, as C. balzaci   ) on stones between tide-marks at Madeira. At the present state of knowledge, the geographical range of C. macaronensis Harmelin   , n. sp. includes the NE Atlantic archipelagoes (Canaries, Madeira, Azores) and the northern coast of the Iberian Peninsula.

NHMUK

Natural History Museum, London

Kingdom

Animalia

Phylum

Bryozoa

Class

Gymnolaemata

Order

Cheilostomatida

Family

Cribrilinidae

Genus

Collarina

Loc

Collarina macaronensis Harmelin

Harmelin, Jean-Georges, Bishop, John D. D., Madurell, Teresa, Souto, Javier, Spencer Jones, Mary E. & Zabala, Mikel 2019
2019
Loc

Cribrilina punctata

ALVAREZ J. A. 1988: 348
FERNANDEZ PULPEIRO E. & RODRIGUEZ BABIO C. 1980: 136
1980
Loc

Cribrilina balzaci

NORMAN A. M. 1903: 98
WATERS A. W. 1899: 9
1899
Loc

Collarina balzaci

Harmelin 1978a (in part): 189
Loc

Collarina fayalensis

Arístegui 1984 (in part): 230