Timea bioxyasterina sp. n., a new species from the Northeastern coast of Brazil (Demospongiae, Hadromerida)
Mothes, Beatriz
Santos, Cristina P.
De Campos, Maurício A.
Zootaxa
2004
2004-02-25
443
1
1
8
Mothes & Santos & De Campos, 2004
Mothes & Santos & De Campos
2004
[264,510,804,830]
Demospongiae
Timeidae
Timea
Animalia
Hadromerida
2
Porifera
species
bioxyasterina
sp. nov.
( Figs. 2–3)
Holotype. MNRJ 7984, off coast Maranhão State, 01°51’00”S– 43°48’00”W, 35.5 mdepth, coll. Fishingboat ‘IV SUDENE’, 25/ii/1973. Sandsubstratum. Schizoholotypeslides.MCNPOR 1850. Comparative material. Timeasp. aff. unistellata(Topsent, 1892)—ZMAPOR 9198, Bonaire, West Indies (fragment deposited in MCNPOR 2644).
Diagnosis. Timea bioxyasterina sp.n.is set apart from the other Atlantic species by its two categories of oxyasters: one bigger with smooth rays and the other shorter with microspined rays.
Description.The specimen is a 1 cmthick encrustation, approximately 10 cm 2insurface area ( Fig. 2a), fixed on a stone fragment. Surface smooth. No orifices observed. Consistency not compressible. Lightbrown colored in ethanol. Skeleton.The ectosome and the choanosome were not observed, because it’s a very thin fragment. Euasters in a random distribution, all over the sponge body. Ascending multispicular tracts of tylostyles occur, isolated and protruding through the surface ( Fig. 2b). Spicules.Tylostyle ( Fig. 3a). Straight, some slightly curved shafts in the terminal half, blunt end; 304 579.5 769.5 mX 6.3 10.5 15 m(N=25). The heads are spherical to ovoid, some bilobed; diameter 2.5 12.3 17.5 m(N=25). Oxyaster I 9 to 11 conical, smooth, straight rays, rare bifurcated, some slightly curved specially in the terminal half ( Figs. 3a, 3b); 32 62 85.8 mdiameter. Oxyaster II 9 to 11, conical, microspined rays, mostly in the apical half ( Figs. 3b, 3c, 3d); 16.1 20.7 27.6 min total diameter. Tylaster 9 to 10 cylindrical rays with swollen extremities, microspined along the axis ( Figs. 3c, 3d); 2.4 3.6 5 min total diameter. FIGURE 2. Timea bioxyasterina sp. nov.(Holotype, MNRJ 7984). a. Specimen fixed and preserved in alcohol (Scale bar = 1 mm); b. Skeletal arrangement (Scale bar = 200 µm). FIGURE 3. Timea bioxyasterina sp. nov.(Holotype, MNRJ 7984). Spicules: a. Tylostyles and oxyasters I, II (Scale bar = 10mm); b. Oxyasters I and II (Scale bar = 10mm); c. Oxyaster II and tylaster (in detail; Scale bar = 5mm). d. Tylasters (in detail; Scale bar = 1mm). TABLE I:Brazilian species of Timea.
Etymology.The species name refers to the presence of two categories of oxyasters.
Remarks.Four other species of Timeahave been reported from the Brazilian coast (Table I). Timea authiaDe Laubenfels, 1930, originally recorded from California( U.S.A.) was subsequently cited by De Laubenfels (1956)for Ubatuba ( São Paulo State, Brazil). It differs from the new species in having smooth to rugose tylasters, and a mix of tylostyles and styles, contrary to the new species' two categories of oxyasters and megascleres, which are always tylostyles. Timea stellifasciata Sarà & Siribelli, 1960, first described from the Gulf of Naples ( Italy), was later identified by BouryEsnault (1973; MNHN LBIMNBE 959 examined) for the coast of the State of Alagoas( Brazil). It is distinguished from the new species through its microspined oxyasters associated to sphaeranthasters, a caltroplike asters, and megascleres, which range from tylostyles, to subtylostyles or styles. Timea agnani BouryEsnault, 1973is best assigned to Cyamon vickersii(Bowerbank, 1864)( Raspailiidae; UFRJPOR 3381, fragment from the holotypeexamined). Timea mixta( Topsent, 1896), described from the Mediterranean firstly ( Holotypereexamined MNHNLBIMDT 2449), was reported by Hechtel (1976)from Recife ( Pernambuco State, Brazil), and differs in having oxyasters next to strongylasters. Comparison with known Caribbean species— Timea perastra(De Laubenfels, 1936), Timea stellata(Bowerbank, 1866), Timea stelligera(Carter, 1882), Timea stenosclera Hechtel, 1969and Timea unistellata(Topsent, 1892)differs by the presence of only one kind of microscleres. Timea parasitica(Higgin, 1877)and Timea hechteli Lehnert & Heimler, 2001differ in having spherasters. Timea micraster Lehnert & Heimler, 2001(Lehnert, pers. comm.) is best assigned to Diplastrella(Spirastrellidae). The new species approaches T. mixta( sensu Wiedenmayer, 1977), which also possesses oxyasters, although in a single size category. Further distinction stems from the latter’s possession of strongylasters in addition.
3337192301
1973-02-25
MNRJ
Fishing & Sand
36
-1.85
Maranhao State
21
-43.8
2
MNRJ 7984
1
Maranhao
holotype