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Taxonomic Notes on Poecillastra Sponges (Astrophorida: Pachastrellidae), with the Description of Three New Bathyal Southeastern Pacific Species

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Taxonomic Notes on Poecillastra Sponges (Astrophorida: Pachastrellidae), with the Description of Three New Bathyal Southeastern Pacific Species Scientia Marina 75(3) September 2011, 477-492, Barcelona (Spain) ISSN: 0214-8358 doi: 10.3989/scimar.2011.75n3477 Taxonomic notes on Poecillastra sponges (Astrophorida: Pachastrellidae), with the description of three new bathyal southeastern Pacific species MARIANA S. CARVALHO 1, RUTH DESQUEYROUX-FAÚNDEZ 2 and EDUARDO HAJDU 1 1 Museu Nacional, Departamento de Invertebrados, Universidade Federal do Rio de Janeiro, Quinta da Boa Vista, s/n, 20940-040, Rio de Janeiro, RJ, Brazil. E-mail: [email protected] 2 Museum d’histoire Naturelle, P.O. Box 6434, 1211 Geneva 6, Switzerland. SUMMARY: Three new species of Poecillastra are described here from bathyal waters off central Chile. P. antonbruunae n. sp. is diagnosed by its two categories of oxeas, the smaller one only up to 621 µm in length, and calthrops as the sole triaene category; P. sinetridens n. sp. by the possession of oxeas larger than 3000 µm long, microxeas which can be over 300 µm long, and absence of triaenes; and P. maremontana n. sp. by its three categories of oxeas, three categories of streptasters (one of spirasters and two of plesiasters), one category of calthrops and centrotylote microxeas. Comments upon other Po- ecillastra and an identification key for Pacific species of the genus are given. Evolutionary hypotheses are discussed for the genus given the distribution of spicule morphotypes, as well as the recurrent phenomenon of spicule loss in Astrophorida. Five species of Pachastrella are transferred here to Poecillastra on the basis of their possession of microxeas instead of microrhabds, viz. P. cribrum Lebwohl, 1914; P. dilifera de Laubenfels, 1934 [sensu Dickinson (1945)]; P. fusca Lebwohl, 1914; P. incrustata Bergquist, 1968; and P. scrobiculosa Lebwohl, 1914. We recognize 28 species of Poecillastra, 19 of them occurring in the Pacific Ocean. Keywords: taxonomy, Porifera, Demospongiae, Chile, Pacific Ocean, bathyal waters. RESUMEN: Taxonomía de esponjas Poecillastra (asTrophorida: pachasTrellidae), con la descripción de Tres nuevas especies baTiales del pacífico surorienTal. – El presente trabajo describe tres nuevas especies de Porifera del género Poeci- llastra, de aguas profundas de la región central de Chile. P. antonbruunae n. sp. presenta dos categorías de oxeas, la más pequeña solo hasta 621 µm de longitud y calthrops como la categoría única de trienios; P. sinetridens n. sp. posee oxeas de tamaño superior a 3000 µm de longitud, sus microxeas alcanzan un tamaño superior a 300 µm de longitud y los trienios están ausentes. P. maremontana n. sp. posee tres categorías de oxeas y tres de streptasters (una de spirasters y dos de plesiasters). Posee además una sola categoría de calthrops y microxeas centrotylotadas. En el presente trabajo se incluyen comentarios acerca de otras especies de Poecillastra, así como una clave de identificación del género para las especies del Pacífico. Se discuten también hipótesis evolutivas del género, basadas sobre la distribución de sus diferentes morfotipos espiculares, así como el fenómeno recurrente de la pérdida de espículas en el orden Astrophorida. Cinco especies del género Pachastrella fueron transferidas para Poecillastra en consecuencia de poseer micróxeas en vez de microrabdos, viz. P. cribrum Lebwohl, 1914; P. dilifera de Laubenfels de 1934 [sensu Dickinson (1945)]; P. fusca Lebwohl, 1914; P. incrustata Bergquist, 1968; y P. scrobiculosa Lebwohl de 1914. Actualmente consideramos válidas 28 especies de Poecillastra, 19 de ellas ocurren en el Océano Pacífico. Palabras clave: taxonomía, Porifera, Demospongiae, Chile, Océano Pacífico, aguas profundas. INTRODUCTION cleres, although the absence and rarity of the former is common in Ancorinidae Schmidt, 1870 (Jaspis Gray, The order Astrophorida Sollas, 1888 is character- 1867; Holoxea Topsent, 1892; Melophlus Thiele, ized by possession of triaenes and oxeas as main megas- 1899; Rhabdastrella Thiele, 1903 and Asteropus Sol- 478 • M.S. CARVALHO et al. las, 1888; Uriz, 2002). In Pachastrellidae Carter, 1875, tetraxons are a widespread character, and their absence is described here for the first time. Poecillastra Sollas, 1888 is diagnosed as Pachas- trellidae with calthrops and/or other kinds of short- shafted triaenes as megascleres, and microscleres which are microxeas and several types of streptasters (Maldonado, 2002). According to van Soest et al. (2008), 23 species are known, 9 of which were re- ported from the Pacific Ocean, viz. P. ciliata Wilson, 1925 (Philippines); P. compressa (Bowerbank, 1866) sensu Sollas (1888; Queen Charlote Islands); P. cri- braria Wilson, 1904 (Galapagos); P. japonica (Thile, 1905; Japan); P. laminaris (Sollas, 1886; New Cal- edonia); P. rickettsi de Laubenfels, 1930 (California, USA); P. stipitata Lévi, 1993 (New Caledonia); P. tenuilaminaris (Sollas, 1886; California, USA and Japan); and P. wondoensis Sim and Kim, 1995 (Ko- rea). Most appear to be from relatively deep waters. Other areas such as the Atlantic Ocean and Mediter- ranean, with five species each, and the Indian Ocean, with three species, are poorer or so far have been less thoroughly investigated. Pachastrellidae is an important source of new bio- active molecules of potential commercial value, such as Dercitine, from Dercitus sp., with a marked antitu- Fig. 1. – Map of the Chilean coast highlighting its central portion moral activity (Burres et al., 1989); Psammapline A, and the location of each new species’s type locality. #, Poecillastra antonbruunae n. sp. (off Constitución); *, P. maremontana n. sp. from Poecillastra sp., with antibacterial activity (Kim (off Juan Fernandez Archipelago); and +, P. sinetridens n. sp. (off et al., 1999); and a citotoxin from Pachastrella sp. Zapallar, Valparaiso). JF, Juan Fernandez Archipelago. (Gunawardana et al., 1989). Nevertheless, the relative- ly small numbers of species known from several large institutions: United States National Museum (USNM, basins and the deep-sea dwelling habit of many species Washington, D.C., USA), Museum d’Histoire Na- suggest that there is a need for improved taxonomic turelle (MHNG, Geneva, Switzerland), and the Huinay effort. Scientific Field Station (HSFS, Huinay, Chile). Six species of Astrophorida were previously known Procedures for the study of spicules and skeletal from Chile, viz. Asteropus ketostea (de Laubenfels, architecture under light microscopy and scanning 1950), Asteropus simplex (Carter, 1879), Geodia electron microscopy (SEM) followed Hajdu (1994). amphistrongyla Lendenfeld, 1910, Geodia magellani SEM analysis was carried out at the Instituto de (Sollas, 1886), Stelletta phrissens Sollas, 1886, and Biofísica Carlos Chagas Filho and the Museu Na- Stelletta vosmaeri (Sollas, 1886). In the present study cional, both at the Universidade Federal do Rio de we describe three new species of Poecillastra from cen- Janeiro, Brazil. tral Chile (32ºS-35ºS). One of these species is atypical Twenty spicules of each category for each speci- in lacking triaenes. This study further determines the men were randomly selected and measured, except status of the Pacific Ocean as the richest ocean basin for oxeas (50 measurements) or in cases in which for this genus. A brief review of Poecillastra species more measurements were necessary to precisely worldwide is undertaken, comparing them to the new establish size ranges for the other spicule types. species described here, and possible biogeographic An exhaustive search for maximum and minimum scenarios are outlined taking into account the distribu- ranges was done. Spicule dimensions are presented tion of spicule morphotypes within the genus and their as minimum-mean-maximum length and width, in primary suggestion of monophyly of the species group micrometres. sharing these characters. Abbreviations: MHNG, Museum d’Histoire Na- turelle, Geneva; MNRJ, Museu Nacional, Rio de MATERIALS AND METHODS Janeiro; BMNH, Natural History Museum, London; SEPBOP, South-East Pacific Biological Oceano- Specimens were collected off the central Chilean graphic Program; SOSC, Smithsonian Oceanographic coast from 290 to 450 m depth. Figure 1 illustrates Sorting Centre; ZMAPOR, Zoological Museum of the the collecting localities for the three specimens stud- University of Amsterdam, Porifera collection; ZIL, ied. These were collected by distinct oceanographic/ Zoological Institute of the Russian Academy of Sci- fisheries surveys, and were deposited in the following ences, St. Petersburg. SCI. MAR., 75(3), September 2011, 477-492. ISSN 0214-8358 doi: 10.3989/scimar.2011.75n3477 TAXONOMY OF POECILLASTRA FROM SOUTHEASTERN PACIFIC • 479 SYSTEMATICS Distribution. Known only from its type locality, off Constitución, central Chile. Class Demospongiae Sollas, 1885 Order Astrophorida Sollas, 1888 Remarks. The new species is closely related to Po- Family Pachastrellidae Carter, 1875 ecillastra schulzei (Sollas, 1886, sensu Sollas, 1888) in Genus Poecillastra Sollas, 1888 its spicule composition (see Table 1). Nevertheless, the status of P. schulzei and its alleged synonyms has been Definition. Pachastrellidae, whose microscleres al- the subject of a long debate, still in need of some clari- ways include streptasters in the form of spirasters and fication. Poecillastra schulzei was considered to be plesiasters, as well as microxeas in a single category conspecific with P. compressa (Bowerbank, 1866) by (Maldonado, 2002). some authors (Topsent, 1894; Burton, 1930). Recently, however, Maldonado (2002) re-examined the type of Type species. Poecillastra compressa (Bowerbank, the former
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