Fenestrulina multiflorum, Figuerola & Gordon & Cristobo, 2018

Figuerola, Blanca, Gordon, Dennis P. & Cristobo, Javier, 2018, New deep Cheilostomata (Bryozoa) species from the Southwestern Atlantic: shedding light in the dark, Zootaxa 4375 (2), pp. 211-249 : 234-236

Fenestrulina multiflorum n. sp.

( FIg. 15 ; TAbLE 17)

Etymology. LATIN ‘ multi- ’, MORE THAN ONE, AND ‘ flΟs ’, FLOWER, ALLUDINg TO THE LARgE FLOWER-LIKE PORES.

Material examined. HΟlΟtype: CRBA-58233, STN PAT0209DR05, COLONY C. 10 MM LONg, 2 MM WIDE, ENCRUSTINg CORAL.

Description. COLONY FORMINg ENCRUSTINg PATCHES; COLONY SIZE AbOUT 10 MM LONg bY 2 MM WIDE. AUTOZOOIDS ELONgATE-OVAL TO HEXAgONAL, CONVEX, SEPARATED bY DEEP, WIDE gROOVES, WITH THE VERTICAL WALLS OF EACH AUTOZOOID FORMINg A bORDER TO THE FRONTAL WALL; UNCALCIFIED WINDOW IN THE bASAL WALLS. FRONTAL SHIELD WITH NUMEROUS LARgE, CLOSELY SPACED, STELLATE PORES OVER ITS WHOLE SURFACE, AND WITH A SINgLE SERIES bETWEEN THE ORIFICE AND THE ASCOPORE. PRIMARY ORIFICE WIDER THAN LONg. FOUR OR FIVE SLENDER ORAL SPINES. ASCOPORE SEPARATED FROM THE ORIFICE bY A DISTANCE ALMOST EqUIVALENT TO THE ORIFICE LENgTH; NARROWLY OVAL, FINELY DENTICULATE. OVICELL gLObOSE, SURFACE CORRUgATED.

Remarks. THIS gENUS IS DIVERSE IN ANTARCTIC AND SUbANTARCTIC SOUTH ATLANTIC WATERS bUT ONLY THE NEW SPECIES HAS AUTOZOOIDS WITH FOUR OR FIVE ORAL SPINES IN THE SAME COLONY. THE ANTARCTIC SPECIES Fenestrulina mariΟni HAYWARD & RYLAND, 1990 HAS STRICTLY FIVE ORAL SPINES, AND SIX ANTARCTIC AND SUbANTARCTIC SPECIES CONSISTENTLY HAVE FOUR ORAL SPINES: F. amplissima HAYWARD, 1980, F. cerνicΟrnis HAYWARD & RYLAND, 1990, F. dictyΟta HAYWARD & RYLAND, 1990, F. dupla HAYWARD & RYLAND, 1990, F. hΟrrida MOYANO, 1985 AND F. specca GORDON, 1989. F. mariΟni HAS A SINgLE MARgINAL SERIES OF STELLATE PORES. F. multiflΟrum n. sp. DIFFERS FROM F. amplissima , F. cerνicΟrnis AND F. dictyΟta MAINLY IN THE PRESENCE OF STOUT SPINES, bIFURCATED IN THE LATTER SPECIES. F. hΟrrida HAS A SMALLER, VERYINCONSPICUOUS ASCOPORE. F. dupla HAS PORES OVER ITS WHOLE SURFACE AND A SINgLE SERIES bETWEEN THE ORIFICE AND THE ASCOPORE INSTEAD OF TWO SERIES; THE PORES ARE ALSO EXCEPTIONALLY LARgE AND PUSTULOSE, WHICH DISTINgUISHES THEM FROM THOSE IN F. ampla CANU AND BASSLER, 1928. HAYWARD & WINSTON (2011) REPORTED THE NEW ZEALAND SPECIES Fenestrulina specca GORDON, 1989 FROM THE SOUTHWEST ATLANTIC; IT HAS THREE OR FOUR SLENDER SPINES bUT IT DIFFERS FROM THE NEW SPECIES IN THE PRESENCE OF A DOUbLE SERIES OF PSEUDOPORES bETWEEN THE ORIFICE AND THE ASCOPORE AND THE CALCIFIED ENDOOECIUM IS FINELY gRANULAR.

n, number of measurements made; SD, standard deviation

Figures

FIGURE15. Fenestrulina multiflorum n. sp., HOLOTYPE.A, PORTION OFA COLONY;B, DETAIL OF THEZOOID;C, DETAIL OF A FLOWER-LIKE (STELLATE) PORE;D, PRIMARY ORIFICE WITH FIVE SPINES; E, ASCOPORE.SCALE bARS:A, 500 ΜM;B,D, 100 ΜM;C, E, 10 ΜM.