Hemiasterella complicata Topsent, 1919

Calcinai, Barbara, Belfiore, Giuseppe, Pica, Daniela, Torsani, Fabrizio, Palma, Marco & Cerrano, Carlo, 2020, Porifera from Ponta do Ouro (Mozambique), European Journal of Taxonomy 698, pp. 1-56: 47-49

publication ID

https://doi.org/10.5852/ejt.2020.698

publication LSID

lsid:zoobank.org:pub:623BBCE3-12A5-45A9-802A-2ED2E15164A3

DOI

http://doi.org/10.5281/zenodo.4335440

persistent identifier

http://treatment.plazi.org/id/F52B791A-FFC8-E916-8115-FBA7C70BF209

treatment provided by

Valdenar

scientific name

Hemiasterella complicata Topsent, 1919
status

 

Hemiasterella complicata Topsent, 1919  

Fig. 27 View Fig

Hemiasterella complicata Topsent, 1919: 7   , figs 2–5.

Material examined

PONTA DO OURO • 1 single, dried fragment of about 4 × 3 cm × 8 mm, several dried portions, 1 alcohol preserved; 26°46′39.864″ S, 32°55′25.284″ E; Cloud break; 34 m deep; 18 May 2015; Torsani leg.; IMG0516 GoogleMaps   1 fragment, alcohol preserved, of about 11 × 5 × 4 mm; 26°50′36.881″ S, 32°54′54.478″ E; Atlantis; 40.7 m deep; 6 Feb. 2017; Cerrano leg.; PO20 GoogleMaps   1 fragment, alcohol preserved; 26°46′38.829″ S, 32°54′17.387″ E; Waynes; 40.6 m deep; 17 Feb. 2017; Cerrano leg.; PO53 GoogleMaps   .

Description

The sponge is lamellate, foliose; color is dark red to violet ( Fig. 27 View Fig A–B). On the surface, two specimens present algal turf. The samples preserved in alcohol changed color to beige; the dried samples are whitish, light brown; in the dried state, spicule tracts create an irregular pattern and thick lines on the surface. The samples have a micro-bristly surface and an elastic consistence.

SKELETON. The ectosome is constituted of a layer of densely packed euasters ( Fig. 27C View Fig ). the choanosome with plumo-reticulate tracts is formed by megascleres ( Fig. 27D View Fig ), without a well-marked differentiation between axial and extra-axial regions.

SPICULES. The megascleres are constituted by strongyloxeas and oxeas ( Fig. 27E View Fig ), with a wide range of intermediate forms, 590–(842.5, 100.8)– 980 µm ×10–(17.25, 4.3)– 25.5 µm; strongylasters with at least five rays ( Fig. 27F View Fig ) with microspined rays 7.5–(12.4, 3.6)– 20 µm, and smooth oxyasters 5–(8.9, 3.8)– 25 µm ( Fig. 27G View Fig ).

Remarks

The examined material fits with the species Hemiasterella complicata Topsent, 1919   . This is a species with a strict distribution, confined to East Africa and Madagascar ( Burton 1959; Vacelet et al. 1976; Pulitzer-Finali 1993). This species is also similar to Hemiasterella vasiformis (Kirkpatrick, 1903) ( Topsent 1919)   , recently recorded by Samaai et al. (2019) in South Africa; as a consequence, a revision of the genus Hemiasterella   and a genetic analysis would be necessary in order to clarify the possible synonymy.

Kingdom

Animalia

Phylum

Porifera

Class

Demospongiae

Order

Hadromerida

Family

Hemiasterellidae

Genus

Hemiasterella

Loc

Hemiasterella complicata Topsent, 1919

Calcinai, Barbara, Belfiore, Giuseppe, Pica, Daniela, Torsani, Fabrizio, Palma, Marco & Cerrano, Carlo 2020
2020
Loc

Hemiasterella complicata

Topsent E. 1919: 7
1919