Prionospio (Aquilaspio) sexoculata Augener, 1918

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: 16-17

publication ID

http://doi.org/ 10.5281/zenodo.191050

persistent identifier

http://treatment.plazi.org/id/9F7A3A46-E04E-1446-FF0D-FD9BFDCA6940

treatment provided by

Plazi

scientific name

Prionospio (Aquilaspio) sexoculata Augener, 1918
status

 

Prionospio (Aquilaspio) sexoculata Augener, 1918 

Figure 8View FIGURE 8

Prionospio sexoculata Augener, 1918: 405  –408, pl. 6, figs. 159, 172. Aquilaspio sexoculata: Foster 1971: 106  .

Prionospio (Aquilaspio) sexoculata: Imajima 1990 b: 2  –5, fig. 3.

Material examined. ESFM –POL/05– 210, 8 specimens, 14 September 2005, Iskenderun Bay, K 8, 36 º 45 ΄ 40 ΄΄N, 36 º 11 ΄ 58 ΄΄E, 5 m, sand; ESFM –POL/05– 364, 2 specimens, 14 September 2005, Iskenderun Bay, K 9, 36 º 54 ΄ 22 ΄΄N, 35 º 58 ΄0 5 ΄΄E, 1 m, sand; ESFM –POL/05– 1222, 2 specimens, 17 September 2005, Mersin Bay, G 6, 36 º 48 ΄ 22 ΄΄N, 34 º 41 ΄ 39 ΄΄E, 5 m, black mud; ESFM –POL/05– 1402, 38 specimens, 17 September 2005, Mersin Bay, G 11, 36 º 45 ΄ 47 ΄΄N, 34 º 51 ΄ 54 ΄΄E, 5 m, sandy mud.

Description. Largest specimen incomplete, 7.3 mm long, 0.24 mm wide with 65 chaetigers. Body slender, enlarged anteriorly, gradually tapering to posterior end, color in alcohol pale yellow. Prostomium rectangular, truncate on anterior margin, with small median peak ( Fig. 8View FIGURE 8 A), slightly inflated at level of eyes, tapering posteriorly, with a narrow caruncle extending to end of chaetiger 1 ( Fig. 8View FIGURE 8 A). Two pairs of eyes, arranged in rectangle; anterior pair larger than posterior ( Fig. 8View FIGURE 8 A –B). Peristomium dorsally fused to chaetiger 1, forming moderate lateral wings ( Fig. 8View FIGURE 8 B).

Branchiae present on chaetigers 2 and 3 ( Fig. 8View FIGURE 8 A –B), all with digitiform pinnules; first pair longest, extending back to posterior part of chaetiger 8. Second pair extending to middle part of chaetiger 6 ( Fig. 8View FIGURE 8 A – B).

Parapodia of chaetiger 1 reduced, with only digitiform neuropodial lamellae, notochaetae absent. Parapodia of chaetiger 2 with rectangular-shaped notopodial lamellae and small triangular neuropodial lamellae with tips bending ventrally ( Fig. 8View FIGURE 8 B). Notopodial postchaetal lamellae of chaetigers 3 and 4 becoming subrectangular, with pointed distal end; neuropodial lamellae of chaetiger 3 rectangular, those of chaetiger 4 rounded. Following notopodial lamellae gradually decreasing in size and becoming rounded. Neuropodial lamellae small, triangular on middle parapodia, digitiform on posterior parapodia. No membranous dorsal crests.

Capillary notochaetae of anterior and middle chaetigers unilimbate, arranged in two rows, those of anterior row being shorter, with wider sheaths than those of posterior row ( Fig. 8View FIGURE 8 F). Both types of chaetae with granulations on distal half of shaft. Capillary neurochaetae unilimbate, arranged in two rows, also with granulations on shaft; inferior sabre chaetae from neuropodia of chaetiger 10 ( Fig. 8View FIGURE 8 E). Neuropodial hooded hooks present from chaetiger 16, numbering up to six per fascicle. Notopodial hooded hooks present from chaetiger 33, numbering up to three per fascicle. Hooks accompanied by capillaries throughout, with four tiers of two small teeth and one apical tooth above main fang ( Fig. 8View FIGURE 8 D).

Pygidium with a long dorsomedial cirrus and two short ventrolateral cirri ( Fig. 8View FIGURE 8 C).

Ecology. The highest population density (380 individuals.m - 2) of this species was found on sandy mud substratum at 5 m depth at station G 11 (Mersin Bay).

Distribution. South east Atlantic, Northwest Pacific ( Imajima 1990 b); Mediterranean Sea, Red Sea, Indian Ocean ( Amoureux et al. 1978, Ben-Eliahu 1995); intertidal to 20 m. It was previously considered as a Lessepsian migrant (Ben-Eliahu 1995).

ESFM

Museum of Faculty of Fisheries, Ege University

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Spionida

Family

Spionidae

Genus

Prionospio

Loc

Prionospio (Aquilaspio) sexoculata Augener, 1918

Dagli, Ertan & Çinar, Melih Ertan 2009
2009
Loc

Prionospio sexoculata

Foster 1971: 106
Augener 1918: 405
Loc

Prionospio (Aquilaspio) sexoculata:

Imajima 1990: 2