Saevitella peristomata (Waters 1899) Waters 1899
- Dataset
- Taxonomic notes on some Cheilostomata (Bryozoa) from Madeira
- Rank
- SPECIES
- Published in
- Berning, Björn (2012): Taxonomic notes on some Cheilostomata (Bryozoa) from Madeira. Zootaxa 3236: 36-54, DOI: 10.5281/zenodo.211022
Classification
- kingdom
- Animalia
- phylum
- Bryozoa
- class
- Gymnolaemata
- order
- Cheilostomatida
- family
- Hippopodinidae
- genus
- Saevitella
- species
- Saevitella peristomata
description
Description. Colony encrusting, unilaminar, multiserial. Zooids subhexagonal, broadest at about mid-distance, separated by shallow grooves or indistinct sutures. Frontal shield only slightly convex, entirely and regularly perforated by numerous round pseudopores separated by nodular ridges. Primary orifice elliptical with a fairly straight proximal margin, slightly longer than wide, broadest in distal third, condyles indistinct in frontal view, pointing downwards, demarcating proximal fourth of total orifice length, visible in an oblique view only; operculum with a pair of small frontal tubercles situated in the proximal fourth; flared peristome entirely surrounding orifice, the interior smoothly calcified with longitudinal striations, outline variable, from oval with relatively straight or wavy lateral margins to 8 - shaped with central indentations almost meeting in centre; orifice in ovicellate zooids only slightly dimorphic, distal margin of peristome formed by proximal ooecial rim and is rather vertically oriented and lower than lateral peristomial margins; oral spines absent. ZL ZW OL OW OvL OvW mean 630 419 149 125 171 279 SD 43 60 11 7 16 23 min. 556 286 121 108 153 242 max. 707 509 166 134 200 318 n 19 19 16 16 14 14 Ovicell subimmersed, endooecium hemispherical, fused onto distal zooecial margin of maternal zooid, broader than long, largely immersed by secondary calcification of distal zooid during ontogeny, surface similar to frontal shield but with smaller and rather elongated pseudopores and relatively thicker and steeper interjacent ridges; proximal ooecial margin concave, the slightly raised ridge fused with lateral peristomial walls of maternal zooid; closed by operculum. Avicularia absent. Ancestrula not observed.
discussion
Remarks. The colonies here designated as (para-) lectotypes were given to Waters for identification by James Yates Johnson and were subsequently returned to the MMF. As Waters (1899) figured only an operculum when introducing Lepralia peristomata, the figured specimen cannot be determined. Hence, I chose the colony in which zooecial and ooecial characters were best displayed.
materials_examined
Material examined. Lectotype: MMF 42043 a (here designated), the only bleached specimen on slide; material from Madeira, collected by J. Y. Johnson from a fish basket trap in 1880 (no further information provided as to the exact location or depth). Paralectotypes: MMF 42043 b – e, the remaining unbleached specimens on the same slide as holotype; judging by residual glue in the slide cavity, one specimen of the original suite is missing.