Desmacella tylovariabilis, Cavalcanti, Thaynã, Santos, George Garcia & Pinheiro, Ulisses, 2015

Cavalcanti, Thaynã, Santos, George Garcia & Pinheiro, Ulisses, 2015, Desmacella Schmidt, 1870 from Brazil: Description of two new species and a review of records (Desmacellida: Demospongiae: Porifera), Zootaxa 4034 (2), pp. 364-374 : 369-371

publication ID

https://doi.org/ 10.11646/zootaxa.4034.2.8

publication LSID

lsid:zoobank.org:pub:5C08231F-2280-4FF8-A042-F94F04466AE3

DOI

https://doi.org/10.5281/zenodo.6112719

persistent identifier

https://treatment.plazi.org/id/03B2565B-FD6E-FFEB-9EBB-F88EFA2FFCE0

treatment provided by

Plazi

scientific name

Desmacella tylovariabilis
status

sp. nov.

Desmacella tylovariabilis sp. nov.

( Figures 1 View FIGURE 1 , 3 View FIGURE 3 , Table 1)

Type locality: Brazil, Rio de Janeiro State, Campos Basin.

Type specimens: Holotype. MNRJ 7339, Campos Basin (22° 58’ S; 42° 1’W), Rio de Janeiro State, Brazil, 1130 m depth, dragging, coll. CENPES/ UFRJ, (07/II/2003).

Diagnosis. Desmacella tylovariabilis sp. nov. is the only Desmacella in the Tropical Western Atlantic with the combination of large tylostyles (616.0 x 11 µm, length x width) bearing rounded tyles in varied positions, and sigmas with microspined ends (34.2 µm, chord length).

External morphology ( Fig. 3 View FIGURE 3 A). Massive sponge, 6 x 4.5 cm (length x width) ( Fig. 3 View FIGURE 3 A). Hispid surface, without distinct oscules, fragile consistency and colour beige (fixed in ethanol).

Skeleton ( Fig. 3 View FIGURE 3 B). Ectosomal skeleton with plumose bundles of tylostyles. Choanosomal skeleton composed of a vaguely halichondrioid skeleton; poorly developed spongin fibres. Sigmas appear to be distributed randomly.

Spicules ( Fig. 3 View FIGURE 3 C–F). Tylostyles (315– 616.0 – 1050 x 6 – 11.0 –16 µm, length x width): long, thin and smooth, straight to slightly curved, rounded tyles situated at varied positions at their bases ( Fig. 3 View FIGURE 3 C, D); Sigmas (25– 34.2 – 48 µm, chord length): thin, abundant and microspined ends ( Fig. 3 View FIGURE 3 E, F).

Distribution ( Fig. 1 View FIGURE 1 ). Brazil: Southeastern Region: Rio de Janeiro State: Campos Basin.

Etymology. The specific epithet tylovariabilis refers to the variation observed on the tyles of the tylostyles, tylo = from the Greek tyle, meaning knob or lump, and varius = from the Latin, meaning different or various.

Remarks. Desmacella tylovariabilis sp. nov. is assigned to the genus because of its tylostyles and sigma spicules, and vaguely halichondrioid skeleton formed by large tylostyles. There are four species similar to D. tylovariabilis sp. nov.: D. grimaldii , D. informis , D. inornata and D. topsenti . They occur in the North Atlantic Ocean, and have similarities regarding spicule dimensions (see Table 1). However, the above species differ from D. tylovariabilis sp. nov. which has rounded tyles situated at varied positions at their bases. The new species differs from D. annexa , D. digitata , D. polysigmata , D. pumilio and D. vicina , by the presence of only one category of sigmas. Desmacella tylovariabilis sp. nov. is distinguished from D. infundibuliformis , D. jania , D. meliorata , D. vagabunda and D. vestibularis , by the new species’ larger tylostyles and sigmas (see Table 1). Desmacella corrugata differs from the new species by the different morphology of its megascleres. Additionally, the new species differs from D. suberitoides as that species presents two categories of tylostyles. Finally, D. tylovariabilis sp. nov. has massive growth form and larger spicules than those of D. microsigmata sp. nov. (Table 1).

MNRJ

Museu Nacional/Universidade Federal de Rio de Janeiro

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