Saevitella jejuensis

Yang, Ho Jin, Seo, Ji Eun & Gordon, Dennis P., 2018, Sixteen new generic records of Korean Bryozoa from southern coastal waters and Jeju Island, East China Sea: evidence of tropical affinities, Zootaxa 4422 (4), pp. 493-518: 503

publication ID

https://doi.org/10.11646/zootaxa.4422.4.3

publication LSID

lsid:zoobank.org:pub:45E16185-7EE6-4768-88DF-6ACA1D29DCE4

persistent identifier

http://treatment.plazi.org/id/03B387C3-9C63-FFAA-76DC-C7D8551AF916

treatment provided by

Plazi

scientific name

Saevitella jejuensis
status

n. sp.

Saevitella jejuensis  n. sp.

( Fig. 18 View Figure )

Etymology. Alluding to the provenance of the species on the south coast of Jeju Island.

Material examined. Holotype: NIBRIV0000805887, unique colony found at Munseom Island, Seogwipo , Jeju Island, 24 December 2016, 20 m, on oyster shell, collected by Ho Jin Yang. 

Description. Colony encrusting, multiserial, unilaminar, up to 23 mm across. Autozooids subhexagonal to subrectangular, longer than wide, margins indicated by thin but distinct suture lines. Lepralioid frontal shield densely and evenly pseudoporous, no granules or tubercles. Orifice subcircular to roundly subquadrate, as wide as long, with no condyles and no distinction between anter and poster, entirely surrounded by smooth, raised peristomial rim. No oral spines. No avicularia.

Ooecium of modest size, somewhat recumbent on distal zooid, as wide as long or a little wider, distally rounded the sides parallel or subparallel, pseudoporous like the frontal shield; proximal margin as smooth and thick as orificial peristome but separated from it at proximolateral corners by thin suture lines. Opening not closed by zooidal operculum.

Ancestrula not seen.

Measurements. ZL 514–717 (645) µm; ZW 246–476 (364) µm; OrL 122–146 (137) µm; OrW 130–165 (149) µm; OoL 169–224 (192) µm; OoW 234–272 (257) µm.

Remarks. Saevitella is a relatively little-known genus, first recognized in the Miocene of Austria ( Bobies 1956), and subsequently in the Miocene of Algeria ( Moissette 1988) and of Borneo ( Di Martino & Taylor 2015). Berning (2012) pointed out that some little-known Italian Pliocene species should also be included in the genus and determined that Recent Lepralia peristomata Waters, 1899  from Madeira belongs to Saevitella, hence the genus ranges to the present day. Saevitella jejuensis  n. sp. constitutes the second living species, extending the geographic range of the genus considerably into the northwest Pacific.

Saevitella jejuensis  n. sp. closely resembles the type species, Saevitella inermis Bobies, 1956  , in all major characters, i.e. shape of orifice, raised peristome, modest size of ooecium, and absence of spines and avicularia, differing from it in the smaller size and greater density of pseudopores; S. inermis  also has a tiny pair of orificial condyles. It differs from S. peristomata  in having a thicker, less sinuate peristome.

Distribution. Korea: Seogwipo, Jeju Island, 20 m depth.

Kingdom

Animalia

Phylum

Bryozoa

Class

Gymnolaemata

Order

Cheilostomatida

Family

Hippopodinidae

Genus

Saevitella

Loc

Saevitella jejuensis

Yang, Ho Jin, Seo, Ji Eun & Gordon, Dennis P. 2018

2018
Loc

Saevitella jejuensis

Yang & Seo & Gordon 2018

2018
Loc

Saevitella inermis

Bobies 1956

1956
Loc

S. inermis

Bobies 1956

1956
Loc

S. peristomata

Waters 1899

1899