Eurystomella, 2002

Gordon, Dennis P., Mawatari, Shunsuke F. & Kajihara, Hiroshi, 2002, New taxa of Japanese and New Zealand Eurystomellidae (Phylum Bryozoa) and their phylogenetic relationships, Zoological Journal of the Linnean Society 136 (2), pp. 199-216 : 203-204

publication ID	https://doi.org/ 10.1046/j.1096-3642.2002.00020.x
DOI	https://doi.org/10.5281/zenodo.4634198
persistent identifier	https://treatment.plazi.org/id/039B3920-286B-774A-FC08-FA7AFEAED274
treatment provided by	Carolina
scientific name	Eurystomella
status	sp. nov.

Treatment

EURYSTOMELLA AUPOURIA View in CoL SP. NOV.

( FIG. 1F View Figure 1 )

Material examined

Holotype: NZOI H-749, from NZOI Stn Z 9716, 34°21.69¢S, 173°00.06¢E, 100 m, Tom Bowling Bay , New Zealand.

Paratype: NZOI P-1218, same locality as holotype . Other material: NZOI Stns Z 9077, Z9679, Z9713 .

Description

Form of colony and autozooidal orifice as in E. foraminigera ; colony colour not known. Autozooids contiguous, quincuncially arranged, 0.37–0.58 mm long (0.46 ± 0.056 mm), 0.28–0.51 mm wide (0.37 ± 0.006 mm). Gymnocystal frontal shield not elevated, perforated by 2 large, nearly crescentic foramina; these very broad, extending almost to the zooidal margins, the inwardly sloping walls broad and shelflike, the inner distal foramen edge generally concealed by the outer distal foramen rim which overlaps it, giving the foramina a slit-like appearance frontally; shield surface smooth proximal to foramina. Orifice as in E. foraminigera . No peristome, umbones, bosses, spines, or avicularia. Maternal zooids and kenozooids as in E. foraminigera , including the size of the kenozooid and its foramen, except that the plane of the foramen opening slopes distad. Zooids communicating by distal and lateral pore-chambers. Ancestrula not known.

Etymology

From aupouri (Maori) alluding to the marine biotic province (Aupourian) in which the species occurs, in turn named after the long NW-trending Aupouri Peninsula at the north of North Island.

Remarks

When frontal membranes and cuticle are removed, Eurystomella aupouria is readily distinguished from E. biperforata by its much broader, narrower foramina that extend almost to the zooidal margins, and in which the inner distal edge is generally concealed.

Distribution

Eurystomella aupouria is endemic to New Zealand, where it is known only from the Three Kings Islands (~34°08¢S) to Spirits Bay (34°25¢S) at depths of 27–100 m.