Antarctotetilla sagitta

• Main Authors: Carella, Mirco, Uriz, Maria J.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2018
• Subjects: Biodiversity; Taxonomy; Animalia; Porifera; Demospongiae; Tetractinellida; Tetillidae; Antarctotetilla; Antarctotetilla sagitta; Antarctic; Kerguelen; Antarc*
• Online Access: https://zenodo.org/record/5988731; https://doi.org/10.5281/zenodo.5988731

Antarctotetilla sagitta (Lendenfeld, 1907) Synonymy: Tethya sagitta Lendenfeld, 1907; Craniella sagitta var. microsigma Kirkpatrick, 1908; Craniella sagitta var. pachyrrhabdus Kirkpatrick, 1908. Material examined: A small piece of the syntype of Tethya sagitta, ZMB Por 3504 Lendenfeld, 1907, Kerguelen, Subantarctic region; Antarctotetilla sagitta, MNHN-IP 2009 31, -65°60'S, 143°03'E, 461–483 m depth, 23 December 2007; MNHN-IP 2 0 0 9 366, -66°20'S, 141°20'E, 207–227 m depth, 13 January 2008 and MNHN-IP 2009 359, -65°60'S, 144°18'E, 229–237 m depth, 12 January 2008, from Terre D’Adélie, Antarctic coasts. GenBank accession numbers (Carella et al. 2016): MNHN-IP 2009 31 (KT12 4320, KT124332 and KT124370), and MNHN-IP 2009 359 (KT124327 and KT124334). Description (Fig. 8). Globular sponges of about 8 cm in diameter, enlarged at the equatorial region (Fig. 8a). Surface corrugate with short projections chiefly formed by groups of oxeas, auxiliary oxeas, and protriaenes, supported by a thin collagen layer. Oscules on top, surrounded by a smooth surface area (Fig. 8c). Pores are in subdermal cavities overlaid by sieve-like ectosomal areas (Fig. 8b), which are distributed mainly at the equatorial region. Sponge color brown-greenish in alcohol. Pseudocortex (Fig. 8d–e) composed by auxiliary oxeas loosely arranged perpendicular to the sponge surface. In contrast to A. leptoderma and A. grandis, this species is easily compressible. Anchoring root-tufts composed by anatriaenes. Spicules (Fig. 9; Table 1). Megascleres: oxeas I (Fig. 9a) large and fusiform: 3700–6418.4–12250 µm x 35 – 62.3–110 µm. Auxiliary small oxeas II (Fig. 9b): 690–1175.5–2007 µm x 6.5–20.6–35 µm. Anatriaenes I (Fig. 9e): 4000–11357.9–19750 µm x17.5–22.5–32.5 µm in size with long thin clades: 100–188.4–250 µm in lenth; rhabdomes fusiform, thicker at the middle and filiform at the terminal part. Anatriaenes II: 3150–3562.5–3900 µm x 12.5–15.8–22.5 µm in size (Fig. 9f) with short clades: 55–74.6–100 µm in length and fusiform rhabdomes. Protriaenes I (Fig. ...