Gesaia (Capa, María, Faroni-Perez, Larisse & Hutchings, Pat 2015)
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Ordo: Sabellida
Familia: Sabellariidae
Name
Gesaia Capa, María, 2015 – Wikispecies link – Pensoft Profile
- Gesaia Capa, María, 2015, Zootaxa 4019: 186-188.
Materials Examined
Material examined. AM W. 47551, Queensland, Osprey Island, 14 ° 40 'S, 145 ° 26 'E, 6–15 m, plankton tow, 7 Oct 1979, larva on SEM stub.
Description
Description.Colour pattern. Preserved specimen lacking pigmentation. Body. Larva almost spherical in shape, 650 µm long and 550 µm maximum width excluding chaetae and paleae; with four clearly demarcated segments corresponding to the parathoracic region (chaetigers 3–6). Operculum. Operculum completely divided into two free short lobes with distal ends nearly perpendicular to longitudinal body axis (Fig. 1 A–C). Outer row with 8–10 paleae on each lobe. Outer paleae circular in cross section at base, tapering distally (Fig. 1 A–C); shaft ornamented for most of its length with thecae as compact rings with smoothly parallel edges (Fig. 1 E). Inner row of paleae with 6–8 paleae on each lobe (Fig. 1 A–C), with stout bases (thicker than outer paleae) and either ellipsoid or circular cross section at base (Fig. 1 B, G), distally tapering, hollowed, with truncated tip (Fig. 1 F); smooth for about half of their length, and distally ornamented with thecae as compact rings with irregular edges proximately, becoming parallel towards the tip (Fig. 1 F). Opercular papillae not developed or not observed. One pair of stout nuchal hooks, strongly recurved; margins smooth without limbations (Fig. 1 G). Tentacular filaments small, forming a cluster partially covered by paleae and not clearly arranged in rows (Fig. 1 A, B). Two wide and short palps at dorsal junction of opercular lobes, with ciliation on its surface particularly, long and dense at the base (Fig. 1 D, E). Median organ between palps, with dense ciliation along its dorsal edge (Fig. 1 D, F). Thorax. Chaetigers 1 and 2, and corresponding features not yet defined. Parathorax. Four chaetigers with two types of notochaetae arranged transversely; four large, lanceolate chaetae, slightly concave and with frayed tips (Fig. 1 H–I) interspersed with four small and straight capillaries (Fig. 1 H–I). Incipient conical branchiae present dorsally on notopodia (Fig. 1 H). Parathoracic neurochaetae not formed. Abdomen and cauda. Abdominal chaetigers not observed. Cauda not yet developed (Fig. 1 A–C).
Discussion
Remarks. The larva studied seems it is at an advanced stage of metamorphosis, after comparison with those from other sabellariids (e.g., Dales 1952; Eckelbarger 1977). Provisional chaetae typical of early larval stages have already disappeared, and the opercular lobes are already well defined and provided with primary paleae. The opercular spines or hooks that appear in advanced larval stage and remain in the adults (e.g., Bhaud 1975 a, b; Mauro 1975; Eckelbarger 1977; Wilson 1977; Bhaud & Fernández-Álamo 2001) are present. Nevertheless, paleae have still not rotated to the dorsal position, and the mouth or building organ are not yet differentiated as observed in ready to settle larvae.
Distribution
Distribution. Only known from off Lizard Island, close to shore, collected in a plankton tow in 6–15 m water depth.
Taxon Treatment
- Capa, María; Faroni-Perez, Larisse; Hutchings, Pat; 2015: Sabellariidae from Lizard Island, Great Barrier Reef, including a new species of Lygdamis and notes on external morphology of the median organ, Zootaxa 4019: 186-188. doi
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