Aricidea (Acmira) katzmanni, Erdoğan-Dereli & Çinar, 2020

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 : 28-36

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Aricidea (Acmira) katzmanni

new species

Aricidea (Acmira) katzmanni   new species

( Figures 17–22 View FIGURE 17 View FIGURE 18 View FIGURE 19 View FIGURE 20 View FIGURE 21 View FIGURE 22 ) 49B63C3F-B1D0-4F17-9733-9A8712D52A04

Material examined. Holotype: ESFM-POL/2013-974 , 06 June 2013, station Y1, 40°00’27’’N, 26°13’24’’E, 10 m, mud GoogleMaps   . Paratypes: ESFM-POL/2012-291 , 27 September 2012, station K8, 40°28’03’’N, 27°42’35’’E, 7-8 m, P. oceanica   , 1 specimen GoogleMaps   ; ESFM-POL/2013-977 , 06 June 2013, station Y1, 40°00’27’’N, 26°13’24’’E, 10 m, mud, 9 specimens GoogleMaps   ; ESFM-POL/2013-45 , 06 June 2013, station Y1, 40°01’08’’N, 26°13’00’’E, 50 m, mud, 1 specimen GoogleMaps   ; ESFM-POL/2013-43 , 06 June 2013, station Y2, 40°06’28’’N, 26°22’51’’E, 10 m, mud with shell fragments, 36 specimens GoogleMaps   ; ESFM-POL/2013-59 , 06 June 2013, station Y2, 40°06’59’’N, 26°22’04’’E, 50 m, muddy sand, 1 specimen GoogleMaps   ; ESFM-POL/2013-978 , 06 June 2013, station Y2, 40°06’32’’N, 26°22’31’’E, 25m, mud with pebble, 3 specimens GoogleMaps   ; ESFM-POL/2013-981 , 06 June 2013, station Y2, 40°06’59’’N, 26°22’04’’E, 50 m, muddy sand, 8 specimens GoogleMaps   ; ESFM-POL/2013-982 , 09 June 2013, station Y16, 40°18’35’’N, 27°45’46’’E, 10 m, fine sand, 11 specimens GoogleMaps   .

Additional material examined. ESFM-POL/2005-2360 , 07 October 2005, Levantine Sea , Göcek, 36º44’20’’N, 28º55’43’’E, 3 m, Zostera marina   , 29 specimens GoogleMaps   ; ESFM-POL/2013-984 , 09 June 2013, station Y17, 40°39’16’’N, 27°41’14’’E, 25 m, fine sand, 19 specimens GoogleMaps   ; ESFM-POL/2013-986 , 09 June 2013, station Y17, 40°39’58’’N, 27°41’08’’E, 50 m, mud, 8 specimens GoogleMaps   ; ESFM-POL/2013-987 , 12 June 2013, station Y19, 40°58’36’’N, 27°42’29’’E, 25 m, mudy sand with Lithothamnion   sp., 1 specimen GoogleMaps   ; ESFM-POL/2013-990 , 13 June 2013, station Y24, 41°03’55’’N, 28°09’12’’E, 10 m, sandy mud with shell fragments, 1 specimen GoogleMaps   ; ESFM-POL/2013-992 , 16 June 2013, station Y24, 41°03’08’’N, 28°08’44’’E, 25 m, mudy sand with Lithothamnion   sp., 3 specimens GoogleMaps   ; ESFM-POL/2013-994 , 17 June 2013, station Y29, 40°32’22’’N, 28°46’59’’E, 10 m, sand with pebble, 25 specimens GoogleMaps   ; ESFM-POL/2013-995 , 14 June 2013, station Y31, 40°01’44’’N, 28°26’31’’E, 10 m, sand, 1 specimen GoogleMaps   ; ESFM-POL/2016-198 , 3 February 2016, Sea of Marmara (Bosphorus), Karaköy, 41°01’29”N, 28°58’55”E, 25 m, sandy mud with shell fragments, 1 specimen GoogleMaps   ; ESFM-POL/2016-192 , 23 August 2016, Levantine Sea , off Finike, 36°17’21”N, 30°13’18”E, 56 m, mud, 1 specimen GoogleMaps   ; ESFM-POL/2016-193 , 25 August 2016, Aegean Sea , Marmaris, 36°50’58”N, 28°16’43”E, 19 m, mud, 34 specimens GoogleMaps   ; ESFM-POL/2016 - 194,19 August 2016, Aegean Sea , Güllük, 37º14’55”N, 27º20’30”E, 37.5 m, sandy mud, 3 specimens GoogleMaps   .

Description. Holotype incomplete (some paratypes complete), 8.44 mm long (2.74–13.67 mm long in paratypes), 0.32 mm wide (0.20–0.57 mm wide in paratypes) with 86 chaetigers (30–102 chaetigers in paratypes). Color of holotype in alcohol yellowish (also in all paratypes); gamete bearing specimens having red speckles near notopodia along body ( Fig. 19I View FIGURE 19 ). Body cylindrical and stout; width of prebranchial and branchial regions nearly same; segmentation narrow in branchial region; slightly thickened in postbranchial region ( Figs 17A View FIGURE 17 ; 18A View FIGURE 18 ; 19A View FIGURE 19 ; 20A View FIGURE 20 ; 21 View FIGURE 21 A–B).

Prostomium subtriangular; much wider than long (ratio length / width: 0.88), anterior margin rounded ( Figs 17A View FIGURE 17 ; 18 View FIGURE 18 A–B; 20C); eyes absent in holotype, present in most paratypes. Crown-like ciliary band (clcb) present ( Figs 17A View FIGURE 17 ; 18A View FIGURE 18 ; 20B, C View FIGURE 20 ; 22A View FIGURE 22 ). A pair of ciliary slits (cs) located just anterior to nuchal organs, semicircular in shape ( Figs 20B, C View FIGURE 20 ; 22A View FIGURE 22 ). Antenna long (0.15 mm in holotype; 0.10–0.26 mm long in paratypes), extending to chaetiger 2; digitiform with more or less swollen region above mid-region; with cilia ( Figs 17A View FIGURE 17 ; 18A View FIGURE 18 ; 20B, C View FIGURE 20 ; 22A View FIGURE 22 ). A pair of nuchal organs present, as narrow, deep, short and slanted slits placed on dorso-lateral sides of posterior prostomium, more or less convex in shaped; dense internal ciliation not reaching to outer margin of slits; without pigmentation ( Fig. 20 View FIGURE 20 B–C). Mouth with three buccal lips; two placed anteriorly, one placed posteriorly and extending to anterior margin of chaetiger 1, with five longitudinal folds; a Y-shaped gap present between anterior lips (also in all paratypes) ( Fig. 18B View FIGURE 18 ).

A dorsal ciliary band (dcb) present on mid-dorsal transversal line of each prebranchial and branchial chaetiger. A pair of short dorsal ciliary bands (sdcb) present in a transverse line, just posterior to base of each branchia ( Figs 20 View FIGURE 20 A–C; 21C). Intersegmental ciliary band (iscb) present, located between segments, originating near notopodia ( Fig. 22B View FIGURE 22 ). Ciliary bands absent on ventral side of body ( Fig. 21 View FIGURE 21 A–B).

Branchiae numbering 18 pairs in holotype, 10–21 pairs in paratypes, starting on chaetiger 4; flattened, foliaceous with rounded tip, weakly swollen in middle branchial region ( Fig. 20A View FIGURE 20 ); dense ciliary bands on both sides of branchiae; ( Figs 17A View FIGURE 17 ; 18A View FIGURE 18 ; 19A View FIGURE 19 ; 21 View FIGURE 21 A–C); branchiae usually shorter than segment width; 220 μm long in anterior region, 233 μm long in middle region, 294 μm long in posterior region; posterior five pairs longer (length / width mostly between; 2.9–8.1).

Notopodial postchaetal lobes starting in chaetiger 1; short, cirriform on first two chaetigers; increasing in length and becoming stout, clavate shaped on chaetiger 3; stout, long, finger-like, with bases symmetrically inflated after chaetiger 3 to end of branchial region; becoming longer, stout and finger-like in postbranchial region; long, thin and filiform in posterior-most region ( Figs 17A View FIGURE 17 ; 18A View FIGURE 18 , C–F; 19B; 20A–B; 21A–C; 22B–C). Neuropodial postchaetal lobes present in chaetigers 1–11 as short ridges; becoming indistinct towards chaetiger 11 ( Figs 17A View FIGURE 17 ; 22B View FIGURE 22 ).

Lateral sense organs present on all chaetigers, located between noto- and neuropodia, just posterior to notopodial postchaetal lobes; elliptical with irregularly clustered pores from prebranchial region to middle part of branchial region; more or less C-shaped with regularly clustered pores from middle part to posterior part of branchial region; straight line-shaped with regularly clustered pores from posterior part of branchial region to end of body ( Fig. 22 View FIGURE 22 A–E); with 30–35 pores in prebranchial region (long axis of organ: 9–10 μm), with 60–62 pores (long axis: 11–12 μm) in branchial region, with 65–68 pores (long axis: 21–22 μm) in posterior part of branchial region, with 80–82 pores (long axis: 24–25 μm) in posterior region; with flexible cilia distinctly protruding from opening or embedded into pore.

Three main types of chaetae present on chaetigers: limbate, capillary and modified neurochaetae. Limbate chaetae of two types; first type present only in notopodia of chaetigers 1–15, numbering 15–27 arranged in three rows, ca. 150 µm long, thin and straight with fibrils along edge (hirsute), dorsally directed side, colorless; second type present only in neuropodia of chaetigers 1–15, numbering 14–42, arranged in four rows, ca. 144 µm µm long, slightly wider and sigmoid with fibrils along edge (hirsute), dorsal to ventral in fascicle, colorless ( Figs 17A View FIGURE 17 ; 18D View FIGURE 18 ; 19B View FIGURE 19 ).

Capillary chaetae starting in noto- and neuropodia of chaetiger 16 and present in all subsequent chaetigers; in middle notopodia numbering 5–8, arranged in two rows, ca. 276 μm long; in posterior notopodia numbering 2–5, arranged in one row, ca. 282 μm long; in middle neuropodia numbering 10–18, arranged in 2–3 rows, ca. 244 μm long; in posterior neuropodia numbering 4–7, arranged in one row, ca. 323 μm long.

Modified neuropodial chaetae from chaetiger 39 (30–40 in paratypes) to pygidium, numbering 4–8 in each neuropodium, accompanied with thin capillary chaetae; as curved hooks (90° degree towards terminal region), with a strong hood, hood with numerous fibrils and encompassing curved end of shaft except for a small subdistal gap; with a short, thin and fragile arista arising from subterminal region (in most specimens arista is missing) ( Figs 17 View FIGURE 17 B–D; 19C–G; 21D); superior chaetae longer, ca. 62 μm long.

Pygidium flattened, rounded, with three cirri ( Figs 18C View FIGURE 18 ; 19H View FIGURE 19 ); two cirri placed ventro-laterally long (91–96 μm) and digitiform; one cirrus placed mid-ventrally short (12.5 μm) and subtriangular.

Reproduction. Some specimens of this species from the Sea of Marmara had sperm packages within coelomic cavities of chaetigers 21–29 and present to the end of the body. The gametous specimens had red speckles near notopodia along the body ( Fig. 19I View FIGURE 19 ).

Remarks. Aricidea (Acmira) katzmanni   n. sp. is mainly characterized by having a digitiform antenna with a swollen region near its middle; by the shape of its different types of limbate chaetae; by possessing notopodial postchaetal lobes with symmetrically inflated bases; by lacking notopodial papillae; by its branchiae becoming longer towards the posterior region and by having curved hooks with a very strong hood and a fragile arista.

The species most morphologically similar to A. katzmanni   n. sp. are A. cerrutii   , A. catherinae   , A. philbinae   and A. pigmentata   . All of them have a curved modified neurochaeta with a strongly or weakly developed hood. However, A. katzmanni   n. sp. differs from these species in terms of the following characters: (1) the shape and size of the antenna (long, digitiform with a swollen region near the mid-region in A. katzmanni   n. sp.; long, digitiform with a central extension in A. catherinae   ; short and clavate in A. philbinae   ; short and digitiform in A. cerrutii   ; claviform and swollen at base in A. pigmentata   ); (2) the notopodial papillae (absent in A. katzmanni   n. sp., A. cerrutii   and A. pigmentata   ; present in the postbranchial region of A. catherinae   ; present in the branchial region of A. philbinae   ; (3) the shape of the modified neurochaeta (as curved hook with a strong hood, very short and fragile arista in A. katzmanni   n. sp.; as curved hook more or less tapering to terminal region with a weak hood and a long arista in A. catherinae   and A. philbinae   ; as curved hook with a strong hood, but without arista in A. cerrutii   ; as curved hook with a weak hood, but without arista in A. pigmentata   ).

Etymology. This species name is dedicated to Dr.Werner Katzmann who made contributions to the understanding of polychaete diversity in the Mediterranean Sea.

Habitat and Distribution. This species was found in soft substrata and Posidonia oceanica   biotope between 7 and 50 m depths in the Sea of Marmara, between 3 and 56 m depths in the Aegean and Levantine Seas.