Reptadeonella aspera, Almeida, Ana C. S., Souza, Facelucia B. C., Sanner, Joann & Vieira, Leandro M., 2015

Almeida, Ana C. S., Souza, Facelucia B. C., Sanner, Joann & Vieira, Leandro M., 2015, Taxonomy of recent Adeonidae (Bryozoa, Cheilostomata) from Brazil, with the description of four new species, Zootaxa 4013 (3), pp. 348-368 : 356-357

Reptadeonella aspera n. sp.

( Figs 15–18 ; 38, Table 1 )

Material examined. Holotype: UFBA 1015, Camaçari, Bahia, Brazil, 12°50' S, 38°10' W, 31 m, coll. February 2006. Paratypes: UFBA 976, UFBA 1003, Camaçari, Bahia, Brazil, 11°21’– 12°37’ S, 37°17’– 38°47’ W, 23–37 m, coll. 2007; UFBA 994, Salvador, Bahia, Brazil, 13°01' S, 38°28' W, 27 m, coll. January 2009; UFBA 1030, UFBA 1052, Camamu, Bahia, Brazil, 12°35'– 13°07' S, 38°29'– 38°48' W, 47–50 m, coll. August 2004. Additional specimens: UFBA 0 17, UFBA 0 45, UFBA 0 69, UFBA 0 98, UFBA 979, UFBA 981, UFBA 983, UFBA 987, UFBA 989, UFBA 992, UFBA 997, UFBA 999, UFBA 1001, UFBA 1005, UFBA 1007, UFBA 1009, UFBA 1011, UFBA 1013, Camaçari, Bahia, Brazil, 12°35'– 13°07' S, 38°29'– 38°48' W, 21–34 m, coll. 1995–2008.

Diagnosis. Multiserial Reptadeonella with rugose frontal calcification, tubular peristome, and elliptical suboral areolar pore visible only in zooids lacking avicularium; suboral avicularium relatively small, subtriangular, directed distally; spiramen transversely elliptical.

Etymology. From Latin asper, rough, alluding to frontal-shield calcification.

Description. Colony encrusting, unilaminar, multiserial. Skeleton glossy, colony white. Zooids more or less elongate-hexagonal to rectangular, longer than wide, delimited by slightly raised irregular lateral margins. Frontal shield heavily calcified, rugose and minutely granular, marginally punctured by a single row of 13–21 areolar pores. Orifice approximately 14% of total length of frontal shield, transversely elliptical, wider than long. Peristomial rim well developed, especially proximally in relation to suboral avicularian chamber; distal areolar pores partly concealed by peristomial rim; suboral areolar pore proportionally large and elliptical, visible only in zooids lacking avicularium. Suboral avicularium relatively small, 0.078–0.117 mm long, longer than wide, directed distally, straight, emplaced in heavily calcified area proximal to peristome, extending to one-third autozooid length; rostrum acute, opesial end with very thin, smooth cryptocystal rim, rounded, with a pair of minute condyles placed one-third length. Frontal avicularia absent. Spiramen transversely elliptical, placed at mid-length of zooid. Gonozooids not recognized.

Remarks. The tubular peristome of Reptadeonella aspera n. sp. resembles that in Reptadeonella cellulanus Tilbrook, Hayward & Gordon, 2001 , Reptadeonella falciformis Tilbrook, 2006 , R. granulosa , Reptadeonella hystricosus Tilbrook, 2006 , Reptadeonella levinseni ( Borg, 1940) , R. tubulifera and Reptadeonella leilae n. sp.

(described below). Reptadeonella aspera n. sp. has rugose frontal calcification and an elliptical spiramen. Differences from R. cellulanus include the orientation of the suboral avicularium (distolateral in R. cellulanus , straight in R. aspera n. sp.). Reptadeonella falciformis , R. hystricosus and R. levinseni have orificial condyles (absent in R. aspera n. sp.). Reptadeonella granulosa and R. leilae n. sp. lack avicularia and have a depressed circular spiramen (non-depressed and elliptical in R. aspera n. sp.). Reptadeonella aspera n. sp. differs from R. tubulifera in its frontal calcification (rugose in R. aspera n. sp., smooth in R. tubulifera ) and spiramen (nondepressed and elliptical in R. aspera n. sp. and depressed and crescentic in R. tubulifera ). The proximal peristomial areolar pore is large and elliptical in R. aspera n. sp.; it was not seen in R. tubulifera .

Distribution. Atlantic: Brazil (Bahia); sublittoral.

Figures

FIGURES 15 – 18. Reptadeonella aspera n. sp., UFBA 1015, holotype, Bahia State, Brazil: 15, 16, colony, general aspect; 17, autozooids showing elevated peristomial rims, avicularia (somewhat eroded) and spiramina; 18, close-up of autozooids showing subperistomial (slit-like, left zooid) and other areolar pores), avicularium (right zooid) and spiramina. Scale bars: 15 = 500 µm; 16, 17, 18 = 100 µm.