Aricidea (Acmira) simonae Laubier & Ramos, 1974,

Erdoğan-Dereli, Deniz & Çinar, Melih Ertan, 2020, The diversity of the genus Aricidea (Polychaeta: Paraonidae) from the Sea of Marmara, with descriptions of two new species and two new records for the Mediterranean fauna, Zootaxa 4844 (1), pp. 1-73: 23-28

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Aricidea (Acmira) simonae Laubier & Ramos, 1974


Aricidea (Acmira) simonae Laubier & Ramos, 1974 

( Figures 13–16View FIGURE 13View FIGURE 14View FIGURE 15View FIGURE 16)

Aricidea simonae Laubier & Ramos 1974: 1123–1127  , figs. 9–10.

Aricidea (Acmira) simonae: Aguirrezabalaga & Gil 2009: 662–664  , fig. 21 B–C; Kurt-Şahin et al. 2019: 161–163, fig. 8.

Material examined. ESFM-POL/2012-495, 01 October 2012, station K15, 40°41’38’’N, 29°36’26’’E, 0,5 m, Mytilus galloprovincialis  , 1 specimenGoogleMaps  ; ESFM-POL/2013-1141, 08 June 2012, station Y15, 40°25’41’’N, 27°27’57’’E, 50 m, fine sand, 1 specimenGoogleMaps  ; ESFM-POL/2013-1142, 09 June 2013, station Y17, 40°39’58’’N, 27°41’08’’E, 50 m, mud, 4 specimensGoogleMaps  ; ESFM-POL/2013-1145, 11 June 2013, station Y18, 40°54’28’’N, 27°33’24’’E, 100 m, sand with mud shell fragments, 2 specimensGoogleMaps  ; ESFM-POL/2013-1146, 12 June 2013, station Y19, 40°58’36’’N, 27°42’39’’E, 25 m, maerl bed, 1 specimenGoogleMaps  ; ESFM-POL/2013-1147, 13 June 2013, station Y24, 41°03’55’’N, 28°09’12’’E, 10 m, sandy mud with shell fragments, 1 specimenGoogleMaps  ; ESFM-POL/2013-1148, 16 June 2013, station Y24, 41°00’16’’N, 28°07’50’’E, 50 m, sand with mudy shell fragments, 4 specimensGoogleMaps  ; ESFM-POL/2013-590, 23 June 2013, station Y32, 40°55’06’’N, 28°34’11’’E, 100 m, sandy mud, 1 specimenGoogleMaps  .

Description. Largest specimen incomplete, 26.5 mm long, 1.33 mm wide, with 85 chaetigers. Color in alcohol usually white, with brown speckles on body. Body stout; straight, anterior part and posterior part of body nearly same thickness ( Fig. 13AView FIGURE 13).

Prostomium subtriangular, much wider than long (ratio length / width: 0.81); anterior margin rounded, with eversible palpode; eyes absent ( Figs. 13BView FIGURE 13; 14View FIGURE 14 A–C). Crown-like ciliary band (clcb) present ( Figs 14View FIGURE 14 B–C). M-shaped transversal ciliary band (cb) present, thin, placed just anterior to antenna and contacting nuchal organs ( Fig. 14CView FIGURE 14). Antenna short, thin, reaching the end of prostomium; inflated on tip (antenna length / prostomium length: 0.35); with a central insertion ( Figs 13EView FIGURE 13; 14View FIGURE 14 A–C). A pair of nuchal organs long, wide and slightly curved slits placed laterally in posterior part of prostomium; more or less concave shape; extending almost 3/5 of prostomium; without coloration ( Figs 13EView FIGURE 13; 14CView FIGURE 14). Mouth with three buccal lips; two placed anteriorly, one placed posteriorly and extending to anterior margin of chaetiger 2, with five longitudinal folds.

A dorsal ciliary band (dcb) present on mid-dorsal transversal line of each prebranchial and branchial chaetigers ( Fig. 14CView FIGURE 14). Short dorsal ciliary bands (sdcb) absent. Ciliary bands absent on ventral side of body.

Branchiae 20–24 pairs, starting on chaetiger 3; thin, cylindro-conical shaped and somewhat flattened, with a rounded tip; shape similar along branchial region; 710 μm long in anterior region, 860 μm in middle region and 645 μm in posterior region; ciliary bands on both sides of branchiae ( Figs 13View FIGURE 13 A–B; 15A, C).

Interramal lobes present in branchial region, located between noto- and neuropodia as a distinct large ridge ( Figs 13View FIGURE 13 B–C, F; 15A, C; 16B). Notopodial papilla absent ( Fig. 15A, CView FIGURE 15). Notopodial postchaetal lobes long, thin and filiform on first two chaetigers; long and digitiform in branchial region; and becoming shorter in posterior region ( Figs 13C, FView FIGURE 13; 15View FIGURE 15 A–C). Neuropodial postchaetal lobes absent. Ventral lobes present, from chaetiger 1 to chaetiger 14 ( Figs 13FView FIGURE 13; 15A, CView FIGURE 15).

Lateral sense organs present, from chaetiger 1 to end of branchial chaetigers; located between notopodia and neuropodia, just posterior to notopodial postchaetal lobes; each sense organ in a straight line with regularly clustered pores; with 25–27 pores in prebranchial region (long axis of organ: 7–8 μm), and about 50–52 pores (long axis: 16–17 μm) in branchial region; with flexible cilia distinctly protruding from opening or embedded into pores ( Fig. 16View FIGURE 16 A–D).

Two main types of chaetae present in chaetigers; capillary and modified neurochaetae ( Figs 13D, FView FIGURE 13; 15View FIGURE 15 B–D; 16B). Capillary chaetae arranged in bundles, present on both neuropodia and notopodia of all chaetigers ( Figs 15View FIGURE 15 B–D; 16B); approximately 355 μm long in anterior region, 494 μm long in middle region, 655 μm long in posterior region. Anterior notopodia with 22–34 capillary chaetae; middle notopodia with 28–37 capillary chaetae; posterior notopodia with 10–14 capillary chaetae. Anterior neuropodia with 28–37 capillary chaetae; middle neuropodia with 35–41 capillary chaetae; posterior neuropodia with 9–12 capillary chaetae. Modified neuropodial chaetae robust, long, with a slightly curved subterminal region ( Fig. 13DView FIGURE 13); present from chaetiger 57 to posterior end, numbering 12–15; superior chaetae longer (about 115 μm).

Pygidium missing.

Remarks. The specimens of Aricidea simonae  from the Sea of Marmara had interramal lobes between the noto- and neuropodia. These were not been mentioned in the original and subsequent descriptions of this species ( Laubier & Ramos 1974; Hartmann-Schröder 1996; Aguirrezabalaga 2012; Kurt-Şahin et al. 2019). Although not described, Laubier & Ramos (1974) illustrated this character in the cross-section of a chaetiger from the branchial region (see Figure 10BView FIGURE 10).

In contrast to other Aricidea  species found in the study area, which have more or less convex-shaped nuchal organs, Aricidea simonae  has long concave-shaped nuchal organs (see Figs. 3CView FIGURE 3; 6DView FIGURE 6; 11CView FIGURE 11; 20BView FIGURE 20; 26FView FIGURE 26; 31BView FIGURE 31; 34CView FIGURE 34; 40BView FIGURE 40; 44CView FIGURE 44; 48AView FIGURE 48). This type of nuchal organ was previously illustrated on the prostomium of A. simplex Day, 1963  ( Day 1963; Strelzov 1979; Blake 1996), A. longicornuta Berkeley & Berkeley, 1950  ( Berkeley & Berkeley 1950), A. mirifica Strelzov, 1973  and A. pulchra Strelzov, 1973  ( Strelzov 1979), and A. neosuecica nipponica Imajima, 1973  ( Imajima 1973).

Among the other species found in the present study, the M-shaped ciliary band on the prostomium is unique for A. simonae  and A. cerrutii  . However, unlike A. cerrutii  , this ciliary band is associated with the nuchal organs in A. simonae  .

Habitat and Distribution. Aricidea simonea  was found in soft substrata and Mytilus galloprovincialis  biotope at depths ranging from 0.5 m to 100 m in the Sea of Marmara. The species was previously reported on similar habitats between 2 and 1113 m depths in the north-east Atlantic Ocean (Gil & Sard 1999; Aguirrezabalaga & Gil 2009), eastern ( Çinar et al. 2014) and western Mediterranean Seas ( Laubier & Ramos 1974; Katzmann & Laubier 1975), and the Black Sea ( Kurt-Sahin et al. 2019).












Aricidea (Acmira) simonae Laubier & Ramos, 1974

Erdoğan-Dereli, Deniz & Çinar, Melih Ertan 2020

Aricidea (Acmira) simonae: Aguirrezabalaga & Gil 2009: 662–664

Kurt-Sahin, G. & Cinar, M. E. & Dagli, E. 2019: 161
Aguirrezabalaga, F. & Gil, J. 2009: 664

Aricidea simonae

Laubier, L. & Ramos, J. 1974: 1127