Eurypon tylospinosum, Aguilar-Camacho & Carballo, 2013

Aguilar-Camacho, Jose Maria & Carballo, Jose Luis, 2013, Raspailiidae (Porifera: Demospongiae: Axinellida) from the Mexican Pacific Ocean with the description of seven new species, Journal of Natural History (J. Nat. Hist.) 47 (25 - 28), pp. 1663-1706: 1687-1690

publication ID

http://doi.org/ 10.1080/00222933.2013.769642

publication LSID

lsid:zoobank.org:pub:74DE7552-F218-48AF-89E2-2EB24465404F

DOI

http://doi.org/10.5281/zenodo.4607508

persistent identifier

http://treatment.plazi.org/id/03E287BA-9E42-5300-FDF5-FC0635E18800

treatment provided by

Carolina

scientific name

Eurypon tylospinosum
status

sp. nov.

Eurypon tylospinosum   sp. nov.

( Figures 14B View Figure 14 , 17 View Figure 17 , 18 View Figure 18 )

Material examined

Holotype: MCNM 1.01 / 659, 27 / 11 / 2002, Cabo Haro, ( Guaymas , Sonora) 15 m (27 ◦ 52 ′ 5 ′′ N, 110 ◦ 57 ′ 1 ′′ W)   . Paratype: 769-LEB-ICML-UNAM, 27 / 11 / 2002, Cabo Haro, ( Guaymas , Sonora), 15 m   (27 ◦ 52 ′ 5 ′′ N, 110 ◦ 57 ′ 1 ′′ W).

Description

Encrusting sponge, size 2–5 cm length × 1–2 cm width and 3–5 mm thick. Oscules and ostia not visible. Surface smooth. Consistency flexible and difficult to tear. Colour in life red, pale in preservation ( Figure 14B View Figure 14 ).

Skeleton

Choanosomal subtylostyles with a pronounced head or modified to style: 200–575 × 7.5–15 µm ( Figures 17A View Figure 17 , 18A View Figure 18 ). Acanthostyles with swollen head with prominent spines. These spines are arranged as a crown around the head: 70–200 × 2.5–7.5 µm ( Figures 17B, C View Figure 17 , 18B View Figure 18 ). Straight or curved subectosomal styles / anisoxeas: 330–460 × 1.75–2.5 µm ( Figures 17D View Figure 17 , 18C View Figure 18 ) ( Table 9). The ectosomal skeleton is absent. The choanosomal skeleton has a hymedesmoid structure. Main subtylostyles and acanthostyles are embedded in a spongin layer (10–25 µm thick). The styles / anisoxeas are dispersed in trichodragmas in the subectosomal region ( Figure 18D View Figure 18 ).

Remarks

Eurypon tylospinosum   sp. nov. is a subtidal species distributed from the Gulf of California. It is characterized by having acanthostyles with swollen head and with prominent spines, which are arranged as a crown around the head. The only species described worldwide that have these features are E. simplex ( Bowerbank 1874)   and E. coronula ( Bowerbank 1874)   ( Table 12). Eurypon simplex ( Bowerbank 1874)   is a yellow encrusting sponge described from the Shetland Islands. It has tylostyles (2116 × 27.1 µm) and acanthostyles (105.8–218.9 × 8.4 µm). The tylostyles are shorter in E. tylospinosum   sp. nov. than in E. simplex   . Besides, E. tylospinosum   sp. nov. has subectosomal styles which are lacking in E. simplex   . Eurypon coronula ( Bowerbank 1874)   is a grey encrusting sponge recorded from the Shetland Islands. It has tylostyles (635–1411 µm) and acanthostyles (254 µm). The tylostyles are longer in E. coronula   than in E. tylospinosum   sp. nov. The remaining species assigned to the genus Eurypon   have spicules in a different category or length than E. tylospinosum   sp. nov. ( Table 12).

Etymology

Named tylospinosum by the swollen and spiny head of the acanthostyles.