New deep Cheilostomata (Bryozoa) species from the Southwestern Atlantic: shedding light in the dark Author Figuerola, Blanca Author Gordon, Dennis P. Author Cristobo, Javier text Zootaxa 2018 2018-01-24 4375 2 211 249 journal article 30934 10.11646/zootaxa.4375.2.3 4fab2908-a6cc-4498-bda9-cf49dcac7039 1175-5326 1298290 B822C78F-B944-4768-8F13-CFA5731DD19C Mucropetraliella reticulata n. sp. ( FIg. 11 ; TAbLE 13 ) Etymology. LATIN ‘ reticulatus ’, NETLIKE, ALLUDINg TO THE CALCIFIED RETICULATE SCULPTURINg OF THE COLONY SURFACE. Material examined. HΟlΟtype: CRBA-58249, STN PAT 1108DR02, C. 10 MM LONg, 8 MM WIDE . Paratype : CRBA-58250, STN PAT 1208DR14, C. 20 MM LONg, 10 MM WIDE . Description. COLONY ENCRUSTINg; MAXIMUM ACHIEVAbLE SIZE NOT KNOWN. AUTOZOOIDS LARgE. FRONTAL SHIELD CONVEX, EVENLY PERFORATED. ORIFICE WITH A MEDIAN SHORT AND bROAD LYRULA AND A PAIR OF ACUTE CONDYLES; AVICULARIA OFTEN PRESENT. A PAIR OF ORAL SPINE bASES SITUATED DISTOLATERALLY. OVICELL PROMINENT, gLObULAR, LONgER THAN WIDE, DENSELY PERFORATED. SUbORAL MUCRO SMOOTH, bIFURCATINg AND FORMINg A VARIAbLE RETICULATED NET OF TUbULAR KENOZOOIDS; FROM THE PROXIMAL SIDE OF THIS TUbULAR COMPLEX OCCASIONALLY SHORT PROjECTIONS ARISE, EACH WITH A SMALL OVAL AVICULARIUM APICALLY; ALL AVICULARIA HAVE COMPLETE PIVOTAL bARS. Remarks. MucrΟpetraliella reticulata n. sp. IS UNIqUE IN THE gENUS IN HAVINg AN ELEVATED NETWORK OF CALCIFICATION PROCEEDINg FROM THE SUbORAL MUCRO OF ADjACENT ZOOIDS. THE gENUS IS THE FIRST RECORD OF THE FAMILY IN THE PATAgONIAN REgION. THE FAMILY NAME PETRALIIDAE IS USED INSTEAD OF PETRALIELLIDAE , FOLLOWINg COOK et al. (IN PRESS). FIGURE 11. Mucropetraliella reticulata n. sp. , HOLOTYPE. A, PART OF THE COLONY; B, GROUP OF OVICELLS; C, DETAIL OF AUTOZOOIDS; D, DETAIL OF TWO OVICELLS; E, DETAIL OF THE PRIMARY ORIFICE; F, DETAIL OF THE PRIMARY ORIFICE WITH TWO SPINES; G, DETAIL OF THE AVICULARIUM. SCALE bARS: A–B, 1 MM; C, 500 ΜM; D, 200 ΜM; E–F, 100 ΜM, G, 50 ΜM. TABLE 13. Measurements (in mm) of Mucropetraliella reticulata n. sp.

N	RANGE	MEAN	SD
AUTOZOOID LENGTH	20	1.0 25–1.449	1.171	0.100
AUTOZOOID WIDTH	20	0.6 73–0.931	0.768	0.068
ORIFICE LENGTH	20	0.2 68–0.389	0.323	0.031
ORIFICE WIDTH	20	0.3 77–0.423	0.398	0.014
AVICULARIUM LENGTH	10	0.0 70–0.101	0.084	0.009
AVICULARIUM WIDTH	10	0.0 63–0.083	0.074	0.008
OVICELL LENGTH	10	0.351–0.494	0.403	0.049
OVICELL WIDTH	10	0.403–0.484	0.440	0.026

n, number of measurements made; SD, standard deviation