Microxina benedeni ( Topsent, 1901 )

Schejter, Laura, Cristobo, Javier & Ríos, Pilar, 2024, New records of demosponges (Porifera) from the South Orkney Islands (Antarctica) with a checklist for the region, Zootaxa 5403 (4), pp. 401-430 : 420

publication ID	https://doi.org/10.11646/zootaxa.5403.4.1
publication LSID	lsid:zoobank.org:pub:C2EAB19C-07CB-4013-9C93-D25259EA2673
DOI	https://doi.org/10.5281/zenodo.10562206
persistent identifier	https://treatment.plazi.org/id/03D687FD-C518-824A-FF45-FCEA6A01BBE1
treatment provided by	Plazi (2024-01-24 14:04:37, last updated 2024-11-30 02:48:56)
scientific name	Microxina benedeni ( Topsent, 1901 )
status

Treatment

Microxina benedeni ( Topsent, 1901) View in CoL

( Fig. 10a–c View FIGURE 10 )

Restricted synonymy: Gelliodes benedeni Topsent, 1901 , Gellius benedeni ( Topsent, 1901) .

Material examined: Several specimens collected at station 11 ( SOI; 60°53'S, 42°35'W; 487 m; 10/3/2014; MACN-In 44388; IEO-CSIC Col.) GoogleMaps .

Description: Tubular specimens, with a densely hairy and conulated surface ( Figure 10a View FIGURE 10 ). Beige to light-brown in colour. Two specimens used small rocks as settlement substrates. Spicules are straight oxeas with sharp ends of 320–780 µm by 20–30 µm and exclusively c sigmata of 45–55 µm ( Figure 10b, c View FIGURE 10 ).

Remarks: There are currently six valid Microxina species which are known from the Antarctic: M. charcoti Topsent, 1916 , M. benedeni ( Topsent, 1901) , M. lanceolata Calcinai & Pansini, 2000 , M. phakellioides ( Kirkpatrick, 1907) , M. sarai Calcinai & Pansini, 2000 and M. simplex ( Topsent, 1916) . They differ in the size range of the oxeas and the complementary microscleres (sigmas, microxeas, toxas) (see Goodwin et al. 2012, for the comparison).Also, M. myxa Goodwin, Brewin & Brickle, 2012 has been also described from South Georgias Islands. Our specimen fits well with the descriptions of M. benedeni , from other Antarctic records: Campos et al. (2007), Göcke & Janussen (2013), Koltun (1964). This finding represents a new record for the SOI. This species has been also documented in other subantarctic regions, such as Malvinas (Falkland) and South Georgias Islands by Burton (1932).

References

Burton, M. (1932) Sponges. Discovery Reports, 6, 237 - 392, pls. 48 - 57. https: // doi. org / 10.5962 / bhl. part. 24379

Campos, M., Mothes, B. & Veitenheimer-Mendes, I. L. (2007) Antarctic sponges (Porifera, Demospongiae) of the South Shetland Islands and vicinity. Part II. Poecilosclerida. Revista Brasileira de Zoologia, 24 (3), 742 - 770. https: // doi. org / 10.1590 / S 0101 - 81752007000300027

Gocke, C. & Janussen, D. (2013) Demospongiae of ANT XXIV / 2 (SYSTCO I) Expedition - Antarctic Eastern Weddell Sea. Zootaxa, 3692 (1), 28 - 101. https: // doi. org / 10.11646 / zootaxa. 3692.1.5

Goodwin, C., Brewin, P. E. & Brickle, P. (2012) Sponge biodiversity of South Georgia island with descriptions of fifteen new species. Zootaxa, 3542 (1), 1 - 48. https: // doi. org / 10.11646 / zootaxa. 3542.1.1

Kirkpatrick, R. (1907) Preliminary Report on the Monaxonellida of the National Antarctic Expedition. Annals and Magazine of Natural History, Series 7, 20 (117), 271 - 291. https: // doi. org / 10.1080 / 00222930709487333

Koltun, V. M. (1964) Sponges of the Antarctic. 1 Tetraxonida and Cornacuspongida. In: Pavlovskii, E. P., Andriyashev, A. P. & Ushakov, P. V. (Eds.), Biological Reports of the Soviet Antarctic Expedition (1955 - 1958). Akademiya Nauk SSSR, Moscow- Leningrad, pp. 6 - 133 + 443 - 448.

Topsent, E. (1901) Spongiaires. Resultats du voyage du S. Y. ' Belgica'en 1897 - 99 sous le commandement de A. de Gerlache de Gomery. Expedition antarctique belge. Zoologie, 4, 1 - 54, pls. I - VI.

Topsent, E. (1916) Diagnoses d'eponges recueillies dans l'Antarctique par le Pourquoi-Pas? Bulletin du Museum national d'histoire naturelle, Paris, Series 1, 22 (3), 163 - 172.