Clathrina fjordica
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BibTeX: @article{Azevedo2009Zootaxa2072, RIS/ Endnote: TY - JOUR Wikipedia/ Citizendium: <ref name="Azevedo2009Zootaxa2072">{{Citation |
Ordo: Clathrinida
Familia: Clathrinidae
Genus: Clathrina
Name
Clathrina fjordica Azevedo, Fernanda, 2009 – Wikispecies link – Pensoft Profile
- Clathrina fjordica Azevedo, Fernanda, 2009, Zootaxa 2072: 6-7.
Materials Examined
Type material. IZUA-POR-0115 = MNRJ8143 (holotype / alcohol). MNRJ8145 = RBINSc POR 115 and MNRJ10321 (paratypes / alcohol). Type locality. Punta Huinay, Comau Fjord, X th Region, Chile. Material examined.MNRJ8142; Tambor, Comau Fjord; collected by E.H., G.L.H. & Ph. Willenz; 20 April 2004; - 20 to - 25 m. IZUA-POR-0115 = MNRJ8143; S. Huinay, Comau Fjord; collected by E.H.; 20 April 2004; - 18 m.MNRJ8145; Punta Huinay, Comau Fjord; collected by E.H., G.L.H. & Ph.W.; 17 April 2004; - 15 to - 18m.MNRJ8183; “Cross” Huinay, Comau Fjord; collected by E.H., G.L.H. & Ph.W.; 18 April 2004; - 10 to - 18 m.MNRJ8197; Tambor, Comau Fjord; collected by E.H., G.L.H. & Ph.W.; 20 April 2004; - 15 to - 25 m.MNRJ8257; Comau Fjord; collected by G. Försterra; 16 September 2003; - 9.5 m. MNRJ8268; Comau Fjord; collected by G.F.; 21 September 2003; - 26.4 m. MNRJ10321; in front of HSFS, Comau Fjord; collected by E.H. & Ph.W.; 9 October 2006; - 8 to - 12 m. Material studied for comparison.BMNH 1882.3.6.7; Slides of the neotype of Clathrina coriacea (Montagu, 1818). Colour. White to light beige in life and yellow to light brown in alcohol.
Etymology
Etymology. From its known distribution, provisionally limited to fjords.
Description
Description. Cormus fragile, the holotype is 60 x45 x 7 mm (Fig. 3 A). It is composed of large, irregular and loosely anastomosed tubes (Figs. 3 B, 9 A). Water-collecting tubes are present. The skeleton has no special organisation, and it is composed of only one category of triactine varying from cylindrical to conical actines (Fig. 3 C). Spicules (Table 3). Triactine [101.9 (± 7.9) / 9.0 (± 1.2) µm]: Regular (equiangular and equiradiate). Actines are cylindrical to conical, undulated with blunt to rounded tips (Fig. 3 D). TABLE 3. Spicules measurements of (MNRJ 8145, MNRJ 8183).the holotype of Clathrina fjordica sp. nov. (IZUA-POR-0115) and paratypes Spicule Length (µm)Width (µm)n min mean s max mean s IZUA-POR-0115 Triactine MNRJ 8145 Triactine75.9 101.9 75.9 115.0 7.9 14.4 122.1 9.0 1.2 161.7 9.6 1.6 60 60MNRJ 10321 Triactine All specimens Triactine75.9 90.6 75.9 102.5 10.0 12.2 115.5 8.0 0.7 161.7 8.9 0.8 30 - Ecology. This species is photophilous. Specimens were collected in depths varying from 8 to 26 m. Some of them were attached to molluscs, such as gastropods (Crepidula sp.) and mussels (Mytilus chilensis), and also to cnidarians (Hexacorallia) and polychaeta (Polynoidae).
Discussion
Remarks. The species that appears morphologically closest to C. fjordica sp. nov. is C. coriacea, reported for Chile by Ridley (1881). The new species is indeed morphologically very similar to C. coriacea. However, a careful comparison between spicules slides of the neotype of C. coriacea showed that the new species can be distinguished by a detail in the shape of the actines. C. coriacea presents a slight constriction near the end of the actines (Fig. 3 E), while C. fjordica sp. nov. has undulated actines in the distal 1 / 3 of the actine (Fig. 3 F). Besides, molecular data (unpublished results) support this non conspecificity. C. coriacea and C. fjordica sp. nov. showed high levels of genetic divergence (4.6 %) when compared to Clathrina conspecific species (0 to 1.4 %). The other clathrinas cited for Chile are C. primordialis and the new species C. antofagastensis sp. nov., described above. C. fjordica sp. nov. differs from C. antofagastensis sp. nov. and C. primordialis by the number of spicules categories, which are one in C. fjordica sp. nov. and two in C. antofagastensis sp. nov. and C. primordialis. Moreover, actines in C. fjordica sp. nov. are undulated, while in C. antofagastensis sp. nov. they are straight.
Taxon Treatment
- Azevedo, Fernanda; Hajdu, Eduardo; Willenz, Philippe; Klautau, Michelle; 2009: New records of Calcareous sponges (Porifera, Calcarea) from the Chilean coast, Zootaxa 2072: 6-7. doi
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