Latrunculia (Latrunculia) copihuensis Hajdu, Desqueyroux-Faúndez, Carvalho, Lôbo-Hajdu and, Hajdu & Desqueyroux-Faúndez & Carvalho & Lôbo-Hajdu & Willenz, 2013

Hajdu, Eduardo, Desqueyroux-Faúndez, Ruth, Carvalho, Mariana De Souza, Lôbo-Hajdu, Gisele & Willenz, Philippe, 2013, Twelve new Demospongiae (Porifera) from Chilean fjords, with remarks upon sponge-derived biogeographic compartments in the SE Pacific, Zootaxa 3744 (1), pp. 1-64 : 31-36

publication ID 10.11646/zootaxa.3744.1.1

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Latrunculia (Latrunculia) copihuensis Hajdu, Desqueyroux-Faúndez, Carvalho, Lôbo-Hajdu and

sp. nov.

Latrunculia (Latrunculia) copihuensis Hajdu, Desqueyroux-Faúndez, Carvalho, Lôbo-Hajdu and View in CoL

Willenz sp. nov.

( Figs. 6B View FIGURE 6 , 7B View FIGURE 7 , 8S View FIGURE 8 –AL, 9B; Tab. 6 View TABLE 6 )

Latrunculia ciruela Hajdu & Willenz, 2009 View in CoL (nomen nudum, in part) in Willenz et al. [2009: 143, top right in situ photo; non top left in situ photo, A–F SEM, = L. (L.) ciruela Hajdu & Willenz View in CoL sp.nov]

Type material. Holotype. RBINSc-IG 32233-POR 9915 , Copihue Channel (50º20’23.10’’S – 75º22’39.20’’W, Chilean Patagonia ), 23 m depth, coll. Ph. Willenz and E. Atwood, 09 March 2006 —fragment of holotype deposited in MHNG 61469 . GoogleMaps

Diagnosis. Latrunculia (L.) copihuensis sp. nov. is the only species of Latrunculia (L.) in the Magellanic region with dark-green colour when alive, round pore fields on top of papillae densely arranged side by side, a second category of megascleres (oxeas), anisodiscorhabds with three whorls of spines (basal whorl frequently with only a few isolated spines, subsidiary whorl 6–7 µm distant from median whorl), and sanidaster-like anisodiscorhabds as microscleres.

Description ( Fig. 6B View FIGURE 6 ). Globular sponge (5.5 cm in maximum diameter). Conspicuous, regularly distributed, slightly elevated (2–3 mm), round inhalant papillae, with flat, slightly expanded upper surface (1–4 mm in diameter). Excurrent papillae, much less common, apparently restricted to the sponge upper surface, are volcaniform, and bear apical oscula (up to 5 mm in diameter). Consistency is firm and rubbery. Live-colour is darkgreen, becoming dark-brown in ethanol. A second individual, uncollected, seemingly identical to the holotype, albeit slightly smaller, is apparent in the series of in situ images obtained.

Skeleton ( Fig. 7B View FIGURE 7 ). Ectosome in two layers, an outer one (up to 180 µm thick) with large areas virtually devoid of megascleres, where anisodiscorhabds and sanidaster-like anisodiscorhabds are common, but never abundant, and a basal layer, 200–400 µm thick, dense in megascleres that are arranged parallel to the surface at some parts, and confusedly in others. Microscleres form no vestige of a palisade, occurring in disorder on the outermost sector, near the sponge surface, or at the base of the outer ectosomal layer. Choanosome, an irregular reticulation of multispicular tracts of megascleres (50–90 µm thick), forming dense criss-crossed networks at their points of contact. There are very few free megascleres in the deeper parts of the choanosome, but these are common in the subectosomal region. Several aquiferous channels of various diameters (60–500 µm) are seen in the subectosome and deeper, but no specialised skeleton occurs on their perimeter. The papillae are supported by a denser arrangement of megascleres, radially oriented when closer to surface (which they frequently pierce), and more confusedly in slightly deeper parts.

Spicules ( Figs. 8S View FIGURE 8 –AL, 9B). Megascleres. Styles ( Figs. 8 View FIGURE 8 AI–AL), mainly smooth, straight or slightly curved, isodiametric, variably sharp apices, occasionally bearing tyles at varied distances from base but mostly not polytylote, 285–386 µm long and 3–9 µm thick. Oxeas ( Figs. 8 View FIGURE 8 AG–AH), rare, mostly bent in the middle (sometimes irregularly crooked), thin, isodiametric, occasionally bearing a few short conical spines, with sharp endings, 285–405 µm long and 3–6 µm thick. Microscleres of two kinds, with rare intermediate forms. Anisodiscorhabds ( Figs. 8S–Y View FIGURE 8 , 9B View FIGURE 9 ): manubrium with large, mostly sharp thorns, with few, or most frequently no secondary spines; basal whorl vestigial, with 1–4 large thorns on opposite sides of the shaft ( Fig. 8S, U–V View FIGURE 8 ), or entirely lacking ( Fig. 8T, W View FIGURE 8 ); shaft smooth; median whorl varies from partially ( Figs. 8S, W–X View FIGURE 8 , 9B View FIGURE 9 ) to well formed plates ( Fig. 8V View FIGURE 8 ), with thorns incised variably deep, frequently with secondary spines; subsidiary whorl, slightly narrower albeit similar to median one and 6–7 µm distant from it, sometimes adjacent to apical one ( Fig. 8U View FIGURE 8 ); apical whorl with thorns incised variably deep, disposed obliquely to the shaft ( Figs. 8U–X View FIGURE 8 ) or bending to form a thimble-like structure ( Fig. 8S View FIGURE 8 ); 34–42 µm long and 14–26 µm across, shaft 3.2–3.6 µm wide. Sanidaster-like anisodiscorhabds ( Figs. 8Z View FIGURE 8 –AF), whorls of spines only barely seen in a few spicules ( Figs. 8Z View FIGURE 8 , AA, AC–AD), these are substituted by large thorns spread all over the shaft, with or without a sparse secondary apical microspination, sometimes even the manubrium and apex being difficult to differentiate (e.g. Fig. 8 View FIGURE 8 AE–AF); 32–47 µm long and 14–23 µm across, shaft 3.2–4 µm wide.

Distribution and ecology. Known only from its type locality at Copihue Channel (50˚20'23.10"S– 75˚22'39.20"W, Chilean Patagonia), where it was collected from 23 m depth. The habitat was very rich, with several animal groups spotted just a few cm away from the sponge: algae, additional species of sponges, cnidarians, bryozoa, polychaetes, echinoids.

Etymology. “Copihuensis” derives from the species type locality—Copihue Channel (Chilean Patagonia).














Latrunculia (Latrunculia) copihuensis Hajdu, Desqueyroux-Faúndez, Carvalho, Lôbo-Hajdu and

Hajdu, Eduardo, Desqueyroux-Faúndez, Ruth, Carvalho, Mariana De Souza, Lôbo-Hajdu, Gisele & Willenz, Philippe 2013

L. (L.) ciruela Hajdu & Willenz

Hajdu & Desqueyroux-Faúndez & Carvalho & Lôbo-Hajdu & Willenz 2013

Latrunculia ciruela

Hajdu & Willenz 2009
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