Prionospio (Aquilaspio) krusadensis Fauvel 1929

Dagli, Ertan & Çinar, Melih Ertan, 2009, Species of the subgenera Aquilaspio and Prionospio (Polychaeta: Spionidae: Prionospio) from the southern coast of Turkey (Levantine Sea, eastern Mediterranean), with description of a new speci, Zootaxa 2275, pp. 1-20: 13-16

publication ID

10.5281/zenodo.191050

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scientific name

Prionospio (Aquilaspio) krusadensis Fauvel 1929
status

 

Prionospio (Aquilaspio) krusadensis Fauvel 1929 

Figures 6–7View FIGURE 6View FIGURE 7

Prionospio krusadensis Fauvel, 1929: 182  –184, fig. 2; Okuda 1937: 244 –246, fig. 21. Prionospio (Aquilaspio) krusadensis: Imajima 1990 b: 5  –8, fig. 3.

Material examined. ESFMAbout ESFM –POL/05– 3206, 1 specimen, 9 September 2005, Iskenderun Bay, G 1, 36 º 35 ΄ 37 ΄΄N, 36 º 11 ΄0 9 ΄΄E, 8 m, mud; ESFMAbout ESFM –POL/05– 3207, 1 specimen, 10 September 2005, Iskenderun Bay, D 13, 36 º 33 ΄ 22 ΄΄N, 35 º 34 ΄ 17 ΄΄E, 10 m, muddy sand; ESFMAbout ESFM –POL/05– 3201, 161 specimens, 14 September 2005, Iskenderun Bay, K 9, 36 º 54 ΄ 22 ΄΄N, 35 º 58 ΄0 5 ΄΄E, 1 m, sand; ESFMAbout ESFM –POL/05– 3204, 12 specimens, 14 September 2005, Iskenderun Bay, K 8, 36 º 45 ΄ 40 ΄΄N, 36 º 11 ΄ 58 ΄΄E, 5 m, sand; ESFMAbout ESFM –POL/05– 3203, 2 specimens, 15 September 2005, Iskenderun Bay, K 11, 36 º 33 ΄ 20 ΄΄N, 35 º 22 ΄ 44 ΄΄E, 1 m, sand; ESFMAbout ESFM –POL/05– 3202, 28 specimens, 17 September 2005, Mersin Bay, G 11, 36 º 45 ΄ 47 ΄΄N, 34 º 51 ΄ 54 ΄΄E, 5 m, sandy mud; ESFMAbout ESFM –POL/ 05– 1355, 11 specimens, 18 September 2005, Mersin Bay, K 14, 1 m, sand; ESFMAbout ESFM –POL/05– 1260, 223 specimens, 19 September 2005, Mersin Bay, K 17, 36 º 28 ΄ 42 ΄΄N, 34 º 10 ΄ 21 ΄΄E, 4 m, sand; ESFMAbout ESFM –POL/05– 3205, 1 specimen, 22 September 2005, Anamur, K 27, 36 º01΄ 17 ΄΄N, 32 º 48 ΄ 14 ΄΄E, 0.1– 5 m, sand.

Description. Largest specimen complete, 0.32 mm wide, 14.9 mm long, with 79 chaetigers. Body slender, stouter in anterior part and gradually decreasing in width towards posterior end. Color in alcohol generally pale yellow.

Prostomium bottle-shaped, bluntly rounded anteriorly, lateral margin somewhat convex, posterior part forming long narrow caruncle, extending to posterior margin of chaetiger 1 ( Fig. 6View FIGURE 6 B). Two pairs of eyes arranged in rectangle, anterior pairs larger than posterior ones ( Fig. 6View FIGURE 6 A, B). Peristomium dorsally fused to chaetiger 1, forming moderate wings. Palps elongate, extending back to chaetiger 7 (to 11 in some specimens), with distinct ciliated groove; densely ciliated on frontal side; basal part of palps thickened, gradually tapering towards end of tip.

Three pairs of pinnate branchiae on chaetigers 2–4; first pairs long, extending to chaetiger 5, with digitiform pinnules on posterior side; tips without pinnules. Second pair of branchiae shorter than first pair, with digitiform pinnules. Third pair shortest, slender, with small sparse pinnules ( Fig. 6View FIGURE 6 A).

Parapodia of chaetiger 1 smaller than subsequent parapodia, with foliaceous notopodial lamellae, without chaetae ( Fig. 6View FIGURE 6 B); neuropodial postsetal lamellae small, rounded, with chaetae. Parapodia of chaetiger 2 with ear-like notopodial lamellae and subrectangular neuropodial lamellae, ventrally pointed. Notopodial postsetal lamellae largest on chaetiger 4, triangular, with dorsally pointed tip; subsequent lamellae gradually becoming smaller and rounded. Neuropodial lamellae of chaetigers 3–5 small, subrectangular; lamellae on remaining chaetigers low, elliptical, becoming rather inconspicuous on posterior chaetigers ( Fig. 6View FIGURE 6 A). No membranous dorsal crests between parapodia.

Anterior noto- and neuropodial lobes with only capillary chaetae, with thin sheath; all capillaries moderately granulated ( Fig. 6View FIGURE 6 E). Ventral sabre chaetae usually from chaetiger 11, sometimes from chaetiger 10, numbering one per fascicle; short, stout, curved, lightly granulated, with a short distal filament ( Figs. 6View FIGURE 6 D, 7 C). Neuropodial hooded hooks present from chaetiger 19–20, numbering up to 7–8 per fascicle, accompanied by capillaries throughout. Notopodial hooded hooks long, slender, usually from chaetigers 34– 35, numbering up to 4–5 per fascicle. Hooks with three tiers of two teeth and one apical tooth above main fang ( Figs. 6View FIGURE 6 C; 7 A–B).

Pygidium with one long medial and two short dorsolateral cirri ( Fig. 6View FIGURE 6 F).

Remarks. Prionospio (Aquilaspio) krusadensis  was first described from the Gulf of Manner (Indian Ocean) by Fauvel (1929) and subsequently from the coast of Japan by Imajima (1990 b). Although the main morphological features of the Mediterranean specimens of P. (A.) krusadensis  are similar to those of the original and subsequent descriptions, some slight differences were observed. These differences are: (1) the length and width of the Mediterranean specimens (length: 14.9 mm, width: 0.32 mm) are smaller than those of the Japanese specimens (length: 26 mm, width: 0.6 mm); (2) notopodial hooded hooks in the Japanese specimens are present from chaetigers 27–31, whereas those in the Mediterranean specimens are present from chaetigers 34–35; and (3) hooks in the Japanese specimens have 5–6 small teeth above the main fang, whereas those in the Mediterranean specimens have 7 small teeth above the main fang ( Fig. 7View FIGURE 7 A–B).

Wu & Chen (1964) synonymized P. (A.) krusadensis  with P. (A.) sexoculata  , without giving any reasons. Foster (1971) later synonymized P. (A.) krusadensis  with P. (A.) aucklandica Augener, 1923  and Blake & Kudenov (1978) and Maciolek (1985) followed this synonymy. However, Imajima (1990 b) did not accept this synonymy and considered these two species as distinct. We also agree with Imajima’s view as there are important differences between these species. For example, P. (A.) krusadensis  has three pinnate branchiae (vs. two pinnate branchiae in P. (A.) sexoculata  ); a spindle-shaped, anteriorly rounded prostomium (vs. a rectangular prostomium with median peaks in P. (A.) sexoculata  ); and lanceolate notopodial lamellae on chaetiger 1 (vs. chaetiger 1 reduced in P. (A.) sexoculata  ).

Ecology. The highest population density (5575 individuals.m - 2) of this species was found on sandy substratum at 4 m depth at station K 17 (Mersin Bay).

Distribution. Western Pacific Ocean and Indian Ocean ( Imajima, 1990 b); intertidal to 33 m. This species could have been introduced to the area by ballast waters of ships.

ESFM

Museum of Faculty of Fisheries, Ege University

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Spionida

Family

Spionidae

Genus

Prionospio

Loc

Prionospio (Aquilaspio) krusadensis Fauvel 1929

Dagli, Ertan & Çinar, Melih Ertan 2009

2009
Loc

Prionospio krusadensis

Imajima 1990: 5Okuda 1937: 244Fauvel 1929: 182

1937