Microporella setiformis O’Donoghue & O’Donoghue, 1923

Chowdhury, Ismael A., Martino, Emanuela Di, Lee, Hannah, Windecker, Claire C. & Craig, Sean, 2024, Diversity and distribution of intertidal Microporella (Bryozoa: Cheilostomatida) from California, European Journal of Taxonomy 932, pp. 34-68 : 57-59

publication ID

https://doi.org/ 10.5852/ejt.2024.932.2509

publication LSID

lsid:zoobank.org:pub:231BF669-4E64-4EAD-8305-4AEA0481D807

DOI

https://doi.org/10.5281/zenodo.11030392

persistent identifier

https://treatment.plazi.org/id/8561E974-BC2D-FFAD-78F2-C8FCFE22E29D

treatment provided by

Plazi

scientific name

Microporella setiformis O’Donoghue & O’Donoghue, 1923
status

 

Microporella setiformis O’Donoghue & O’Donoghue, 1923 View in CoL

Fig. 9 View Fig , Table 2 View Table 2

Microporella setiformis O’Donoghue & O’Donoghue, 1923: 174 View in CoL , pl. 3 fig. 21.

Microporella setiformis View in CoL – Osburn 1952: 385, pl. 44 fig. 8. — Soule et al. 1995: 150, pl. 53 figs a–d. — Dick et al. 2005: 3752 View Cited Treatment , fig. 18c–d.

Material examined

USA • 1 living colony of 30 zooids, none ovicellate, on rock; California, Black Sand Beach; 40°24′50.5074″ N, 124°23′48.1056″ W; 9 Jun. 2020; I.A. Chowdhury and H. Lee leg.; SBMNH 704776a GoogleMaps 1 colony of 20 zooids, none ovicellate, on rock; California, Black Sand Beach ; 40°24′50.5074″ N, 124°23′48.1056″ W; 9 Jun. 2020; I.A. Chowdhury and H. Lee leg.; SBMNH 704776b GoogleMaps 1 colony of 60 zooids, 18 ovicellate, on rock; California, Black Sand Beach ; 40°24′50.5074″ N, 124°23′48.1056″ W; 9 Jun. 2020; I.A. Chowdhury and H. Lee leg.; SBMNH 704776c GoogleMaps 1 colony of 30 zooids, none ovicellate, on rock; California, Black Sand Beach ; 40°24′50.5074″ N, 124°23′48.1056″ W; 9 Jun. 2020; I.A. Chowdhury and H. Lee leg.; SBMNH 704776d GoogleMaps 1 colony of 40 zooids, none ovicellate, on rock; California Black Sand Beach; 40°24′50.5074″ N, 124°23′48.1056″ W; 9 Jun. 2020; I.A. Chowdhury and H. Lee leg.; SBMNH 704776e GoogleMaps 1 colony of 60 zooids, 13 ovicellate, on rock; California, Black Sand Beach ; 40°24′50.5074″ N, 124°23′48.1056″ W; 9 Jun. 2020; I.A. Chowdhury and H. Lee leg.; SBMNH 704776f GoogleMaps .

Description

Colony encrusting, multiserial, unilaminar, forming subcircular patches, typically encrusting rocks of various sizes; pore chamber windows visible at the colony growing edge ( Fig. 9E View Fig ), circular to elliptical, three on distal margin and 4–5 on each distolateral vertical wall.

Autozooids rounded hexagonal or irregularly polygonal, ZL = 377–540 µm (470±48 µm, N = 20), ZW = 272–439 µm (348±45 µm, N = 20), mean L/W = 1.30; boundaries marked by grooves between slightly raised vertical walls. Frontal shield flat to slightly convex, finely granular, with 52–89 circular pseudopores (D = 5–12 µm) and 10–12 circular to elliptical, marginal areolae per side, clearly distinguishable from pseudopores by their larger size (D = 10–22 µm) ( Fig. 9A–B View Fig ).

Primary orifice transversely D-shaped, OL = 114–139 µm (124±8 µm, N = 10), OW = 120–148 µm (133±8 µm, N = 10), mean OL/OW = 0.93, mean ZL/OL = 3.80; outlined by rim of smooth gymnocyst; hinge-line straight, smooth, with two low, trapezoidal condyles at corners ( Fig. 9C View Fig ). Two oral spines observed in some zooids, later obscured by secondary calcification or ovicell ( Fig. 9F View Fig ).

Ascopore unusually small, circular (18–25 µm in diameter), with smooth margin, covering plate lacking ( Fig. 9C View Fig ); at same level as adjacent frontal shield, 2–3 ascopore widths from orifice, outlined by rim of gymnocystal calcification independent from that encircling orifice.

Avicularia small, single or paired, AvL = 40–51 µm (46±4 µm, N = 7), AvW = 21–30 µm (25±3 µm, N = 7), mean AvL/AvW = 1.85; located distally at same level as ascopore ( Fig. 9C View Fig ); crossbar complete ( Fig. 9D View Fig ); rostrum rounded-triangular, directed laterally or slightly distolaterally, rostrum tip only slightly raised. Mandible not observed.

Ovicell prominent, round, wider than long ( Fig. 9A, D View Fig ); OvL = 194–281 µm (242±33 µm, N = 6), OvW = 305–363 µm (332±21 µm, N = 7), mean OvL/OvW = 0.73; continuous with frontal shield of next distal zooid, obscuring distal margin of maternal orifice; calcification finely granular like that of frontal shield but with marked ribs; perforated by small pseudopores, 5–14 µm in maximum dimension.

Aberrant kenozooids smaller than autozooids or nearly as large, lacking opening such as orifice and ascopore but equipped with avicularium ( Fig. 9B View Fig , see asterisks).

Ancestrula not observed.

Remarks

Our material fits the description of Microporella setiformis , a species originally described from British Columbia, Canada ( O’Donoghue & O’Donoghue 1923).

Distribution and ecology

Microporella setiformis has been recorded from intertidal waters to over 100 m depth. The species ranges from Ketchikan, Alaska ( Dick et al. 2005) southward Channel Islands in southern California ( Soule et al. 1995).

SBMNH

SBMNH

Kingdom

Animalia

Phylum

Bryozoa

Class

Gymnolaemata

Order

Cheilostomatida

SuperFamily

Schizoporelloidea

Family

Microporellidae

Genus

Microporella

Loc

Microporella setiformis O’Donoghue & O’Donoghue, 1923

Chowdhury, Ismael A., Martino, Emanuela Di, Lee, Hannah, Windecker, Claire C. & Craig, Sean 2024
2024
Loc

Microporella setiformis

Dick M. H. & Grischenko A. V. & Mawatari S. F. 2005: 3752
Soule D. F. & Soule J. D. & Chaney H. W. 1995: 150
Osburn R. C. 1952: 385
1952
Loc

Microporella setiformis O’Donoghue & O’Donoghue, 1923: 174

O'Donoghue C. H. & O'Donoghue E. 1923: 174
1923
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