Paramoera anivae, Labay, Vjacheslav S., 2012

Labay, Vjacheslav S., 2012, Paramoera anivae a new species of Eusiridae Stebbing, 1888 (Crustacea: Amphipoda: Gammaridea) from the Okhotsk Sea, Zootaxa 3475, pp. 69-85 : 70-85

publication ID	https://doi.org/ 10.5281/zenodo.211511
DOI	https://doi.org/10.5281/zenodo.5669871
persistent identifier	https://treatment.plazi.org/id/660587F8-FFEE-FFDA-41AE-4BAC1DA9FD51
treatment provided by	Plazi
scientific name	Paramoera anivae
status	sp. nov.

Treatment

Paramoera anivae sp. nov.

Figures 1–11 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 View FIGURE 6 View FIGURE 7 View FIGURE 8 View FIGURE 9 View FIGURE 11

Diagnosis. Dorsal surface of body segments smooth, bearing detached fine setae. Eyes medium, dark, suboval. Vital body color is white. Head with rostral point; inferior antennal sinus moderate, sub-rounded. Antenna 1 is 1.4 times as long as antenna 2.Inner plate of maxilla 1 with 5 plumose setae; inner plate of maxilla 2 with 3–4 plumose setae. Carpus and propodus of pereopod 1 and 2 in female with specifically spoonformes plumose setae. Pereopod 2 of male with carpus about 50% as long as propodus. Pereopod 2 of female with carpus about 110% as long as propodus. Pleopod 2 in male without sexual transformation. Uropod 3: rami without plumose setae. Lobes of telson fused to half of its length (male) or 0.75 of length (female); each apex truncate (male) or pointed (female), with 2 setae, one of them long. Coxal gills present on pereopods 2–6.

Material examined. Holotype: male, 4.5 mm, collection of Zoological Museum of Far East State University, Vladivostok: N X 31072 View Materials /1365, Aniva Bay (Okhotsk Sea), Cape Tomari-Aniva; 46° 37.3915 North, 142° 52.1833 East, 16 October 2010, coll. V. S. Labay. Paratypes: N X 31073 View Materials /1366, several tens of males and females with same data as holotype; several tens males and young specimens from some locality, 10 September 2010, coll. V. S. Labay.

Description. Male (4.5 mm). Body smooth dorsally, without teeth and humps ( Fig. 1 View FIGURE 1 ), bearing detached fine setae. Sculpture of cover (all coxa, basis of pereopods 3–7, epimerae 1–3) pointed ( Fig. 2 View FIGURE 2 ).

Head with rostral point. Inferior antennal sinus moderate, subrounded ( Fig. 3 View FIGURE 3 a). Lower corner of cephalon subrectangular. Eye medium, suboval, about 1/3 of the head height.

Antenna 1 ( Fig. 3 View FIGURE 3 b) longer than antenna 2; about ½ length of body; peduncular articles 1–3 shortened progressively, article 1 with few setae at the distal part of lower margin; primary flagellum with 20 articles; one of two alternating articles bearing the lanceolate aesthetasc accompanied by setae ( Fig. 3 View FIGURE 3 c); calceoli absent; accessory flagellum typical, 1-articulate, scale-like ( Fig. 3 View FIGURE 3 c).

Antenna 2 ( Fig 3 View FIGURE 3 d): peduncular article 5 subequel to article 4, both articles with 3 tufts of setae along lower margin; flagellum with 15 articles.

Upper lip ( Fig. 4 View FIGURE 4 a) with conical base and broad oval apex; with small numerous setae at the distal margin.

Mandibles subequal: right mandible ( Fig. 4 View FIGURE 4 b) with incisor 7-dentate, lacinia mobilis 5-bidentate; palp article 2 longer than 3 with rare row of 10 setae, one distal setae plumose, article 3 bearing 3 B-setae, 2 C-setae, 12 D-setae and 5 E-setae; incisor of left mandible 6-dentate, lacinia mobilis trifurcate. Lower lip ( Fig. 4 View FIGURE 4 c): inner lobes absent. Maxilla 1 ( Fig. 4 View FIGURE 4 d, e): outer plate with 8–10 large toothed combed spines, inner plate with 5 plumose strong setae; palp article 2 is 3 times as long as article 1, article 2 with 6 teeth and 1–2 setae distally and with 1 seta on outer margin medio-distally.

Maxilla 2 ( Fig. 4 View FIGURE 4 f): plates subequal in size; outer plate with numerous long setae on apex; inner plate with oblique row of 3 plumose long setae on inner margin and with numerous setae on apex.

Maxilliped ( Fig. 5 View FIGURE 5 a): inner plate with 3 stout spines apically; outer plate with 6 rare strong setae apically and with 5 transverse rows of setae along inner margin; palp 4-articulate, article 1 ½ times as long as article 2, article 2 with a row of simple setae on inner margin, article 3 with a row of simple setae in the distal part of inner margin, with few setae apically and with 1 subapical seta on outer margin, dactylus with 3 spineformes setae along inner margin.

Pereopod 1 (gnathopod 1) ( Fig. 5 View FIGURE 5 b, c): coxa short, rounded, with a few small setae along ventral margin; basis stout with few long setae along anterior and posterior margins; carpus ½ times as long as propodus with a row of comb plumose setae along broad rounded posterior lobe; propodus suboval, palmar margin oblique and rounded, smoothly passed to posterior margin, with two rows of 3–4 spines at palmar corner at each face and with 2 specifically stout plumose setae at the inner surface near palmar corner, posterior margin with a row of comb plumose setae, palm subequal to posterior margin with a row of small setae along palmar margin and with broken submarginal row of setae; dactylus curved, inner margin of dactylus weakly dentate.

Pereopod 2 (gnathopod 2) ( Fig. 5 View FIGURE 5 d, e): coxa rounded rectangular with few small setae along ventral margin; basis stout with few long setae at posterior margin; carpus ½ times as long as propodus with 4 transversal rows of plumose setae along broad rounded posterior lobe, with a row of long setae at the distal part of posterior margin and with specifically stout plumose seta near posterior-distal corner; propodus almond-formes, palmar margin oblique, smoothly passed to posterior margin, with two rows of 4 spines at palmar corner, posterior margin with 5 transversal rows of comb plumose setae, palm shorter than posterior margin with a row of various setae along palmar margin; dactylus slightly curved, inner margin of dactylus weakly dentate.

Pereopod 3 ( Fig. 6 View FIGURE 6 a) subequal to pereopod 4 in length; coxa rounded with prominent anterior margin, bearing 7–8 short setae along ventral margin; basis long, anterior margin with 1 long seta in proximal part and with 2–3 short setae along anterior margin, anterior distal corner with 1 short seta, posterior margin with 1 set of long setae in proximal ¼ and with 2–3 short setae along posterior margin, posterior distal corner with 2 short setae; merus 1.25 times as long as carpus, with 2 spines along anterior margin and with 2 sets of setae along posterior margin, anterior and posterior distal corners with 2 setae; carpus subequal to propodus, with 1–2 small setae along anterior and posterior margins, antero-distal corner with 1 small seta, postero-distal corner with tuft of various setae; propodus linear, with 3 small setae along anterior margin and with 3 small spines along posterior margin, posterodistal corner with tuft of setae and 2 spines; dactylus length about 40% of corresponding propodus, nail thin and curved with 1 seta in base.

Pereopod 4 ( Fig. 6 View FIGURE 6 b): coxa rounded, posterior margin excavated, bearing 10–11 short setae along ventral margin; basis long, with 2 short setae along distal half of anterior and posterior margins, anterior distal corner with 1 short seta, posterior distal corner with bunch of setae; merus 1.25 times as long as carpus, with 2 setae along anterior margin and with 1 set of setae in the middle of posterior margin, anterior distal corner with bunch of setae and 1 spine, posterior distal corner with 1 long seta; carpus subequal to propodus, with 2 small setae along anterior and posterior margins, antero-distal corner with 1 small seta, postero-distal corner with tuft of various setae; propodus linear, with 3 small setae along anterior margin and with 3 small spines along posterior margin, posterodistal corner with tuft of setae and 2 spines; dactylus about 40% of corresponding propodus, nail thin and curved with 1 seta in base.

Pereopods 5–7 increase in size from 5 to 7 ( Fig. 1 View FIGURE 1 ). Coxal plates 5–7 decrease in size from 5 to 7 ( Fig. 6 View FIGURE 6 c, d, e). Coxa 5 large, coxa width 1.3 times as long as corresponding basis, anterior lobe subequal to posteror lobe; anterior lobe of coxa 6 oblique, more smaller than posterior lobe, posterior lobe with 4 short setae along ventral margin; coxa 7 small, without anterior lobe, posterior lobe with 2–3 small setae along posterior-ventral margin.

Pereopod 5 ( Fig. 6 View FIGURE 6 c) basis broad with weak wing, anterior margin subserrated with small spines, posterior margin serrated with small setae; merus subequal to carpus, with 1–2 spines in the middle of anterior margin and with bunch of setae on anterior distal corner, with 3 spines along posterior margin and with bunch of spines at postero-distal lobe; carpus subequal to propodus, with 2 spines along anterior and posterior margins and with bunches of spines at antero-distal and postero-distal margins; propodus linear, with 3 spines along anterior margin and with 2 small setae along posterior margin, antero-distal corner with 2 spines; dactylus length about 40% of corresponding propodus, nail thin and curved with 2 setae in base.

Pereopod 6 ( Fig. 6 View FIGURE 6 d) basis more narrow than basis 5; merus, carpus, propodus and dactylus subequal to ones of pereopod 5; postero-distal corner of propodus with strong spine.

Pereopod 7 ( Fig. 6 View FIGURE 6 e) basis more narrow than basis 5 and 6; merus, carpus, propodus and dactylus subequal to ones of pereopod 5; postero-distal corner of propodus with bunch of strong spines.

Epimeral plate 1 ( Fig. 7 View FIGURE 7 a) rounded triangular with 1 diagonal ridge, hind corner slightly obtuse; posterior margin slightly concave with 2 notches. Epimeral plate 2 ( Fig. 7 View FIGURE 7 b): anterior margin excavate, posterior and ventral margins concave, with oblique crest, hind corner subrectangular, posterior margin with 3 notches, ventral margin with a row of 5 spines. Epimeral plate 3 ( Fig. 7 View FIGURE 7 c) without oblique crest, anterior margin with few long setae, posterior margin concave, with 5 weak notches and small setae, ventral margin with a row of 4 spines. Pleopods normal ( Fig. 7 View FIGURE 7 d, e, f); peduncle with two specific toothed coupling spines on the inner corner; inner ramus slightly shorter than outer, basis of inner ramus with 2 of specific stout two-pointed plumose setae along inner margin ( Fig. 7 View FIGURE 7 g).

Uropod 1 ( Fig. 7 View FIGURE 7 h): peduncle long, 1.8 times as long as rami, with numerous spines along inner posterior and outer posterior margins; rami subequel with 1 strong spine apically each, both rami with spines along posterior margin. Uropod 2 ( Fig. 7 View FIGURE 7 i): peduncle long, 1.4 times as long as outer ramus, with numerous spines along inner posterior and outer posterior margins; inner ramus slightly shorter than outer, both rami with 2–3 paired spines along posterior margin, rami with 2 spines on apex, one of them very long. Uropod 3 ( Fig. 7 View FIGURE 7 j): peduncle stout, 70–80% of rami long, without spines along posterior margin, only 1–2 spines near the base of rami; rami subequal, inner ramus with 2–3 paired spines along posterior margin, outer ramus with 5 spines along outer posterior margin and with 3 spine along inner posterior margin, rami with 1 simple seta subapically.

Telson ( Fig. 7 View FIGURE 7 k) cleft about 55% of its length, tips of lobes truncate with 2 setae apically, one of them long, laterally with 1 seta each.

Female (4.0 mm). Similar to male. Differing in following characteristics. Antenna 1 ( Fig 8 View FIGURE 8 a, b, c): peduncular article 1 with a row of 5 rare setae in distal part of ventral margin; peduncular article 2 with 5 tufts of setae along ventral margin; primary flagellum with 17 articles; one of two alternating articles bearing the lanceolate aesthetasc accompanied by setae ( Fig. 8 View FIGURE 8 c); calceoli absent; accessory flagellum typical, 1-articulate, scale-like ( Fig. 8 View FIGURE 8 b). Antenna 2 ( Fig. 8 View FIGURE 8 d) similar to one in male.

Mandibles subequal: right mandible with incisor 7-dentate, lacinia mobilis 5-bidentate ( Fig. 8 View FIGURE 8 f), setal row with 5 comb serrated long setae and with additional row of numerous comb plumose small setae; palp article 2 longer than 3 ( Fig. 3 View FIGURE 3 e) with rare row of 11 setae, 2 distal setae strong and simple, article 3 bearing 1 A-seta, 4 B-setae, 10 D-setae and 5 E-setae. Maxilla 1 ( Fig. 8 View FIGURE 8 g, h): outer plate with 10 large toothed combed spines, inner plate with 5 plumose strong setae; palp article 2 is 3 times as long as article 1, article 2 with 7 teeth and 1 seta distally and with 1 seta on outer margin subdistally. Maxilla 2 ( Fig. 8 View FIGURE 8 i): inner plate with oblique row of 4 plumose long setae on inner margin and with numerous setae on apex. Maxilliped ( Fig. 9 View FIGURE 9 a): inner plate with 3 stout spines apically; outer plate with a row of 11 strong spineformes setae turn to apex; palp article 3 with a row of plumose strong setae apically, dactylus with 3 spineformes setae along inner margin.

Pereopods 1 and 2 longer and thiner than ones in male. Pereopod 1 (gnathopod 1) ( Fig. 9 View FIGURE 9 b, c): basis with dense tuft of long setae at posterior margins medially; carpus ¾ times as long as propodus with a row of 4 bunches specifically spoonformes plumose setae along posterior margin; propodus rectangular, palmar margin slightly oblique, palmar corner distinct with 3 spines at each face; inner surface with lengthwise row of 3 paired plumose setae near posterior margin and with lengthwise row of 4 paired plumose setae near anterior margin, posterior margin with a row of 3 bunches specifically spoonformes plumose setae; inner margin of dactylus minutely toothed. Pereopod 2 (gnathopod 2) ( Fig. 9 View FIGURE 9 d, e): carpus 1.1 times as long as propodus with a row of 4 bunches specifically spoonformes plumose setae along posterior margin and 1 strong simple seta distally; propodus long rectangular, palmar margin oblique, palmar corner distinct with 3 spines at each face; posterior margin with a row of 4 bunches specifically spoonformes plumose setae; inner margin of dactylus minutely toothed.

Pereopods 3–7 (Fig. 10) similar to ones in male.

Epimeral plate 1–3 ( Fig. 1 View FIGURE 1 a, b, c) similar to ones in male. Epimeral plate 2: posterior margin with 2 notches, ventral margin with a row of 2 spines. Epimeral plate 3: posterior margin with 3 weak notches, ventral margin with a row of 2 spines. Pleopods ( Fig. 11 View FIGURE 11 d, e) similar to ones in male.

Uropod 1 ( Fig. 11 View FIGURE 11 f): peduncle with a less number of spines along posterior margins than in male; inner ramus slightly shorter than outer with 1 strong and 3 small spines apically each, both rami with 1–2 spines along posterior margin. Uropod 2 ( Fig. 11 View FIGURE 11 g): peduncle with 2 spines along inner posterior margin; inner ramus slightly shorter than outer, both rami with 1 spine along posterior margin, rami with 3–4 spines on apex, one of them very long. Uropod 3 ( Fig. 11 View FIGURE 11 h): peduncle with 4 spines along posterior margin, rami subequal, with 4 spines along posterior margin and with 1 simple seta subapically.

Telson ( Fig. 11 View FIGURE 11 i) cleft about 75% of its length, tips of lobes pointed with 2 setae apically, one of them long.

Sexual dimorphism. Females similar to males in sculpture of cover, in structure of head, antenna 2, pereopods 3–7, pleopods. Difference observed in armament of lower margin of peduncular article 1: rare row of 5 setae and apical tuft of setae in female and apical tuft of setae in male only. Inner plate with oblique row of 3 plumose long setae on inner margin in males and with 4 plumose long setae in female. Maximal difference observed in structure and armaments of pereopods 1–2. Less armament characterized epimeral plates 1–3 and uropods 1–2 in female. More armaments of uropod 3 differs in female. Important difference observed in structure of telson: tips of lobes truncate in male and pointed in female.

Paramoera anivae sp. nov., 4.0 mm, paratype, a) 3; 4, c)

6, e) pereopod 7; scale— 1 mm

Variability. Age variations observed in structure of antenna 1 flagellum: from 16 articles in 3.5 mm specimens to 20 articles in 4.5 mm specimens. Mandible palp article 2 with a row of 7–8 setae in young specimens and with 10–11 setae in mature specimens. Setae armament of mandible palp article 3 changeable. Less armament characterized epimeral plates 1–3 and uropods 1–2 in young specimens. Rami of uropod 3 without lateral setae (usually) or inner ramus with 1 tuft of 2 simple setae (rarely). Lateral setae of telson present or absent.

Characteristics Paramoera anivae , sp. nov. Paramoera Paramoera Paramoera (Ganigamoera) (Ganigamoera) tiunovi mokievskii myslenkovi Sidorov, 2010 Sidorov, 2010 ( Gurjanova, 1952) Male Female Male Female Male Female Male (?) Carination of body absent absent absent absent ...... continued on next page

Characteristics Paramoera Paramoera Paramoera koysama Paramoera erimoensis

brevirostrata tridentata Kuribayashi et Kyono, Kuribayashi et Kyono, 1995

(Bulytscheva, 1952) Bulytscheva, 1952 1995

Female (?) female (?) Male Female Male Female

Carination of body absent epimeron 1–3 with 1 absent absent

tooth dorsally each

Coxal gill 7?? present absent ...... continued on next page Type locality. Russia, Far East, Aniba Bay, Cape Tomari-Aniva, upper level of littoral, gravels and stones, 10–20 cm under the ground level in fresh run out, on the bottom surface of stones.

Remarks. The genus Paramoera Miers, 1875 includes 10 species in the Far East: P. k o re a n a Stephensen, 1944 from Korean Peninsula, P. hanamurai Hirayama, 1990 , P. k o y s a m a Kuribayashi & Kyono, 1995, P. erimoensis Kuribayashi & Kyono, 1995 from Hokkaido, P. mokyevskii ( Gurjanova, 1952) , P. brevirostrata (Bulytscheva, 1952) , P. tridentata Bulytscheva, 1952 , P. udehe ( Derzhavin, 1930) , P. (Ganigamoera) myslenkovi Sidorov, 2010 , P. (G.) tiunovi Sidorov, 2010 from Russian Far East (Bulytscheva 1952; Derzhavin, 1930; Gurjanova, 1952; Hirayama, 1990; Kuribayashi & Kyono, 1995; Sidorov, 2010; Stephensen, 1944). The last three species were founded in fresh waters. Considering that P. udehe was inadequately described, the taxonomic status of this species remains ambiguous. Our search in 2001–2002, 2008–2010 and the search of D. A. Sidorov (2010) in 2005–2007 were not resultative.

Distinctions of P. a n i v a e from similar species are show in the Table 1. The list of characteristics is taken from the paper of Sidorov (2010) with some changes. When comparing I have refused such important sign as the nomenclature for setal patterns on article 3 of the mandibular palp ( Karaman, 1970; Stock, 1974), because this sign in P. anivae has considerable variability.

Structurally, Paramoera anivae is closest to P. koreana , P. k o y s a m a, P. mokyevskii and P. brevirostrata , apparently from the Table 1. Paramoera koreana and P. koysama differ from P. anivae by large subrectangular eyes and by the scheme of arms of the inner plate of maxilla 1. Paramoera anivae differs from P. mokyevskii by medium, suboval eyes, by the scheme of arms of the inner plate of maxilla 1 and maxilla 2 and other characteristics. Paramoera anivae differs from P. brevirostrata by the scheme of arms of the inner plate of maxilla 1, by the ratio of carpus long to propodus long and its armament of pereopods 1 and 2 and other characteristics.

Paramoera anivae is closest to species of subgenera Humilomoera Staude, 1995, Rhithromoera Staude, 1995 and Paramoera bousfieldi Staude, 1995 among North American species of a genus Paramoera ( Staude, 1995) . The subgenus Humilomoera differs from P. a n i v a e by the scheme of arms of the inner plate of maxilla 1 and maxilla 2 (4 plumose setae at maxilla 1 and 2 plumose setae at maxilla 2). The subgenus Rhithromoera differs from P. a n i v a e by inferior antennal sinus deep and angular, by the scheme of arms of the inner plate of maxilla 1 (4 plumose setae). Paramoera bousfieldi differs from P. anivae by inferior antennal sinus deep and angular, by the scheme of arms of the inner plate of maxilla 1 (6–7 plumose setae).