Ernstia, KLAUTAU ET AL., 2013
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publication ID |
https://doi.org/ 10.1111/zoj.12213 |
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DOI |
https://doi.org/10.5281/zenodo.10531075 |
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persistent identifier |
https://treatment.plazi.org/id/03C387F7-FFC0-274F-CEC5-9D7AC8651EBE |
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treatment provided by |
Carolina |
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scientific name |
Ernstia |
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GENUS ERNSTIA KLAUTAU ET AL., 2013
Diagnosis: Calcinea in which the cormus comprises a typical clathroid body. A stalk may be present. The skeleton contains regular (equiangular and equiradiate) and/ or sagittal triactines and tetractines. Tetractines are the most abundant spicules or occur at least in the same proportion as the triactines. Tetractines frequently have very thin (needle-like) apical actines. Diactines may be present. Asconoid aquiferous system.
ERNSTIA TETRACTINA ( KLAUTAU & BOROJEVIC, 2001) View in CoL
( FIG. 9 View Figure 9 ; TABLE 9)
Material examined: Two specimens. MNRJ 11344 View Materials (fragments: RBINSc-IG 32239-POR 11344, CZA 11344, and MHNG 85343 View Materials ); Ladrón Bay , Lobos de Afuera Islands , Guano Islands and Capes National Reserve System (06°56′00.59′′S, 80°42′58.70′′W); collected by Ph. Willenz and Y. Hooker; 11 m depth; 04.x.2007 GoogleMaps . MNRJ 11347 View Materials (fragments: RBINSc-IG 32239-POR 11347, CZA 11347, and MHNG 85346 View Materials ); Santo Domingo Islet , Lobos de Afuera Islands , Guano Islands and Capes National Reserve System (06°55′09.80′′S, 80°44′09.40′′W); collected by Ph. Willenz and Y. Hooker; 20 m depth; 05.x.2007 GoogleMaps .
Colour: White in life and light beige in ethanol.
Description: Thinly encrusting sponge (2.5 × 1.0 × 0.2 cm). Consistency is soft and fragile. Cormus is formed by irregular and loosely anastomosed tubes (0.2–0.5 mm) ( Fig. 9A–C View Figure 9 ). Water-collecting tubes are present (1.5 mm, diameter). Granular cells are absent. Aquiferous system is asconoid.
Skeleton: Without any special organization, composed of abundant tetractines and few triactines ( Fig. 9E View Figure 9 ).
Spicules ( Table 9):
1. Triactines: regular (equiangular and equiradiate). Actines are conical, straight, with sharp tips.
2. Tetractines: regular (equiangular and equiradiate). Actines are conical, straight, with sharp tips ( Fig. 9F View Figure 9 ). Apical actine is straight, smooth, very thin, and frequently longer than the basal ones ( Fig. 9F View Figure 9 ).
Reproduction: Unknown
Ecology: Lives in habitats with low amounts of sediment. Individuals were found underneath boulders, protected from sunlight. A low diversity of fauna was found near this species. Chitons and serpulid polychaetes as well as a finely incrusting yellow demosponge were found sharing the same substrate; however, these were fairly distant from E. tetractina . Some sea urchin spines were also found nearby. Bathymetrical distribution varies from 11 to 20 m depth.
Geographical distribution: South-eastern coast of Brazil (23°S) and Lobos de Afuera Islands in Peru (6°S) ( Fig. 9H View Figure 9 ) .
Remarks: The genus Ernstia was recently proposed ( Klautau et al., 2013). It comprises five species: Ernstia adusta ( Wörheide & Hooper, 1999) ( Australia) , Ernstia quadriradiata ( Klautau & Borojevic, 2001) ( Brazil) , Ernstia sagamiana ( Hôzawa, 1929) ( Japan) , Ernstia septentrionalis ( Rapp et al., 2001) ( Norway) , and Ernstia tetractina ( Klautau & Borojevic, 2001) ( Brazil) . Ernstia tetractina was originally described from and considered endemic to the coast of Brazil, where its distribution is restricted to the south-east coast ( Klautau & Borojevic, 2001). Its first report outside Brazil raises the need for a population genetics study.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.