Rhamphostomella Grischenko, Gordon, Taylor, Kuklinski, Denisenko, Spencer-Jones & Ostrovsky, 2022
- Dataset
- GBIF Backbone Taxonomy
- Rank
- GENUS
Classification
- kingdom
- Animalia
- phylum
- Bryozoa
- class
- Gymnolaemata
- order
- Cheilostomatida
- family
- Umbonulidae
- genus
- Rhamphostomella
description
(Fig. 26)
discussion
Remarks. Gontar (1993 a) described Rhamphostomella peristomata from Paramushir Island, northern Kuril Islands. She mentioned a finely granulated to “ fine-meshed ” pattern on the frontal wall; a rounded primary orifice with a medium-sized lyrula on the proximal border; an irregularly oval peristomial secondary orifice; and a small avicularium with rounded mandible “ between the primary and secondary orifices close to proximal border of the first one, somewhat to the right or left of the center of this border ” (see Gontar 1993 a, p. 12, fig. 5). Ovicells were absent in Gontar’s specimen. SEM examination of the holotype colony (Fig. 26) revealed that this specimen has: 1) a non-cormidial secondary orifice in a low tubular peristome formed entirely by elevation of the frontal wall of the maternal zooid and lacking sutures (both external and internal); 2) a well-developed distal zooidal wall, forming the distal part of peristome with the distal orifical margin separated from the distal zooidal margin by a distance of half to one-quarter orifice length, and 3) 2 – 5 areolae (often small) along the distal margin of the zooid. This set of characters is atypical for Rhamphostomella. No other species in the genus has a subterminal orifice, with areolae extending around the distal zooidal margin. Accordingly, R. peristomata is here only tentatively attributed to this genus, pending further data on morphology and genetics.
materials_examined
Material examined. Holotype: ZIRAS 1 / 44568, colony encrusting shell, 26 August 1969, off Cape Levashov, Paramushir Island, northern Kuril Islands, Pacific Ocean, depth 32 m, SCUBA, collector A. N. Golikov.