Exechonella similis Caceres-Chamizo, Sanner, Tilbrook & Ostrovsky 2017

Autor: Dick, Matthew H., Ngai, Nguyen Danh, Doan, Hung Dinh
Rok vydání: 2020
Předmět:
DOI: 10.5281/zenodo.3703656
Popis: Exechonella similis C��ceres-Chamizo, Sanner, Tilbrook & Ostrovsky, 2017 (Fig. 6E, F) Exechonella similis C��ceres-Chamizo et al., 2017, p. 43, fig. 17. ? Exechonella brasiliensis: Winston & Heimberg 1986, p. 15, figs 26���27. Exechonella brasiliensis: Tilbrook et al. 2001, p. 65, fig. 8g. Material examined. VNMN-0226 (CT-24), on SEM stub. Measurements. AzL, 0.78���1.09 (0.930 �� 0.094); AzW, 0.52���0.80 (0.670 �� 0.074) (n = 15, 1). OrL, 0.18���0.21 (0.198 �� 0.012); OrW, 0.19���0.21 (0.203 �� 0.006) (n = 7, 1). Description. Colony encrusting, unilaminar, sheet-like. Zooids large, hexagonal, delineated by groove. Frontal shield convex, with minute areolae; perforated with 19���36 (29.7 �� 4.0; n = 13) foramina, each with smooth, raised rim. Orifice on average about as wide as long; with low, rounded condyles slightly proximal to middle; poster as wide as anter or nearly so, rounded-quadrate. Raised peristome surrounding orifice, slightly flared, smooth inside, pustulose outside, not obscuring orifice; often with low, blunt projection on proximal rim. Lateral-most foramen on one or both sides larger than rest, converted to avicularium, scarcely differentiated externally from other foramina. Oral spines, ooecia lacking. Remarks. C��ceres-Chamizo et al. (2017) described this species in detail, with excellent illustrations. Average zooid size at Co To (AzL �� AzW, 0.93 �� 0.67 mm) is larger than presented in the original description (0.78 �� 0.62 mm), but the number of frontal foramina is similar (19���36 at Co To vs 21���36 originally described). The original description states that the orifice is wider than long, but this is scarcely reflected in the accompanying measurements (OrL �� OrW, 0.19 �� 0.20 mm), and not at all at Co To (0.20 �� 0.20 mm). Distribution. The type locality is Lizard Island, Great Barrier Reef; this species is also known from Vanuatu (C��ceres-Chamizo et al. 2017). The previously known latitudinal range was 14��� 15��S; the Co To record extends the range northward nearly to 21��N.
Published as part of Dick, Matthew H., Ngai, Nguyen Danh & Doan, Hung Dinh, 2020, Taxonomy and diversity of coelobite bryozoans from drift coral cobbles on Co To Island, northern Vietnam, pp. 201-252 in Zootaxa 4747 (2) on page 216, DOI: 10.11646/zootaxa.4747.2.1, http://zenodo.org/record/3694740
{"references":["Caceres-Chamizo, J. P., Sanner, J., Tilbrook, K. J. & Ostrovsky, A. N. (2017) Revision of the Recent species of Exechonella Canu and Bassler in Duvergier, 1924 and Actisecos Canu & Bassler, 1927 (Bryozoa, Cheilostomata): systematics, biogeography and evolutionary trends in skeletal morphology. Zootaxa, 4305 (1), 1 - 79. https: // doi. org / 10.11646 / zootaxa. 4305.1.1","Winston, J. E. & Heimberg, B. F. (1986) Bryozoans from Bali, Lombok, and Komodo. American Museum Novitates, 2847, 1 - 49.","Tilbrook, K. J., Hayward, P. J. & Gordon, D. P. (2001) Cheilostomatous Bryozoa from Vanuatu. Zoological Journal of the Linnean Society, 131, 35 - 109. https: // doi. org / 10.1111 / j. 1096 - 3642.2001. tb 01309. x"]}
Databáze: OpenAIRE
Externí odkaz: