Echinogammarus ozbeki, Baytaşoğlu, 2023
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publication ID |
https://dx.doi.org/10.3897/zookeys.1173.102946 |
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publication LSID |
lsid:zoobank.org:pub:05351219-71DC-4A3F-840C-E8EFC1B5BC8B |
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persistent identifier |
https://treatment.plazi.org/id/5585E361-E857-4808-ABDB-FC7143F93AAB |
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taxon LSID |
lsid:zoobank.org:act:5585E361-E857-4808-ABDB-FC7143F93AAB |
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treatment provided by |
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scientific name |
Echinogammarus ozbeki |
| status |
sp. nov. |
Echinogammarus ozbeki sp. nov.
Figs 2 View Figure 2 , 3 View Figure 3 , 4 View Figure 4 , 5 View Figure 5 , 6 View Figure 6
Type materials.
Holotype. Male, maximum 8.1 mm; Gümüşhane Province, Türkiye (40.081°N, 39.041°E), 17.ix.2019, FFR20000. Paratypes. 21 males and 13 females, FFR20001, same data as holotype.
Etymology.
The new species is named in honour of Prof. Dr Murat Özbek (Ege University, Faculty of Fisheries, Bornova, İzmir). The name is a noun in the genitive singular.
Diagnosis.
A small species with kidney-shaped eyes, peduncle segments of antenna 1 bearing a group of long setae distal end, setation of antenna 2 moderate on both peduncular and flagellar segments, urosomites flat, uropod 3 parviramous, inner ramus with 1 or 2 distal spines accompanied by 1 or 2 setae; endopod/exopod ratio 0.21; telson with 1 or 2 setae on outer margin and 1 or 2 setae on the inner surface of each lobe. Anterior and posterior margins of pereopods 5-7 have spines and a few setae.
Description.
Holotype male. Head (Fig. 2 View Figure 2 ): cephalic lobes rounded, inferior antennal sinus deep, eyes kidney-shaped, shorter than the diameter of the first peduncular segment of antenna 1.
Antenna 1 (Fig. 3A View Figure 3 ) longer than half (~0.75) of the body length, setation weak, peduncle segments bear a group of long setae on the distal end; The length of the setae is 1.2 times the diameter of the segment in which they are implanted. The main flagellum with 19 or 20 segments, accessory flagellum 2- or 3-segmented.
Antenna 2 (Fig. 3B View Figure 3 ) shorter than antenna 1 (0.48 of antenna 1), antennal gland cone straight and reaches to distal end of third peduncular segment, setation moderate on both peduncular and flagellar segments; setae along ventral margins of peduncular segments more than twice as long as diameter of segment; setae on dorsal side of peduncular segments shorter; flagellum with 7 or 8 segments, calceoli absent.
Gnathopod 1 (Fig. 3D View Figure 3 ): basis with 5 or 6 long setae on both posterior and anterior margins; (up to 2.0 times longer than diameter of segment); ischium and merus with a single group of setae on posterodistal corner; carpus ~0.68 of propodus; propodus with 1 medial palmar spine and 3 palmar angle spines, and a few setae on inner surface; dactylus long, with 1 seta on outer margin.
Gnathopod 2 (Fig. 3E View Figure 3 ): basis with long setae on anterior and posterior margins (up to 2.0 times longer than diameter of segment); ischium and merus as on gnathopod 1; carpus ~0.82 of propodus; length of propodus ~0.5 of its width; superior lateral setae bear 3 or 4 groups of setae rows, 1-5 setae in each row; inferior margin bears some setae groups. Propodus palm bear 2 strong and 2 short median palmar spines and short simple setae; without spine on inner surface of propodus.
Pereopod 3 (Fig. 3G View Figure 3 ): basis bears 2 groups of long setae and 2 setae in each group on posterior margin; 4 or 5 setae on anterior margin; ischium bears 3 or 4 posterodistal seta; merus bears 3 rows of setae and 3 or 6 setae in each row on posterior margin and a setal group at posterodistal tip; 2 rows of spines and setae (order of setas and spins: 1 spine + 1 seta) on anterior margin; 1 strong and 1 small spine and 1 group of long setae in the anterodistal tip; setae longer than diameter of segment. Carpus bears 3 groups of spines and setae on posterior margin (order of setas and spins: 2 spines + 3 setae, 2 spines + 3 or 4 setae, 1 strong spine + 3 setae); bald anterior margin; 1 strong spine and 2 long setae in the anterodistal tip; propodus bear 3 groups of spines and setae on the posterior margin, order of setas and spins 2 spines + 1 seta; bald anterior margin; 3 or 4 setae in the anterodistal tip; 1 plumose seta on dorsal margin; dactylus with 2 simple setae at hinge of nail.
Mandible (Fig. 4G, H View Figure 4 ): incisor with 4 teeth; lacinia mobilis with 4 dentitions; molar triturative; first article of palp without setae, second article bears 4 or 6 distal setae, third article armed with three group E setae, 16 group D setae, and 2 group A setae.
Upper lip (Fig. 4E View Figure 4 ) with minute setae in distal part.
Lower lip (Fig. 4D View Figure 4 ): inner lobe absent, apical margin with minute setae.
Maxilla (Fig. 4B, C View Figure 4 ): inner plate of maxilla 1 with ~11 marginal setae, outer plate with 8 serrated spine teeth; article 2 of right palp with 4 blunt spines, article 2 of left palp with 6 slender spines.
Maxilla 2 (Fig. 4F View Figure 4 ): inner plate with 7 simple facial setae, implanted subparallel to the inner margin; 6 apical setae on inner plate, 7 apical setae on outer plate.
Maxilliped (Fig. 4A View Figure 4 ): inner plate with 1 subapical spine, 3 blunt apical spine, 5 or 6 marginal setae; outer plate 8 marginal setae and 7 or 8 apical setae.
Pereopod 4 (Fig. 6A View Figure 6 ) shorter than P3; basis bear 4 or 5 long setae on the posterior margin, 1 long seta on anterior margin; 2 setae on anterodistal and posterodistal tip; ischium bears 2 posterodistal setae; merus with 4 groups of setae on posterior margin, 2 spines and 1 seta on anterior margin, 1 strong and 1 small spines and 3 or 4 setae on anterodistal tip; carpus short, with 3 groups of spines and setae on posterior margin (order of setas and spins: 1 spine + 1 seta); bald anterior margin; propodus bear 3 groups of spines and setae on posterior margin; bald anterior margin, 4 or 5 setae in anterodistal; 1 plumose seta on dorsal margin, dactylus with 2 simple setae at hinge of nail.
Pereopod 5 (Fig. 5C View Figure 5 ): basis with a row of 4 spines on anterior margin; posterior margin of basis slightly convex, serrated, with sequential setae; ischium with 2 spines and 2 setae on anterodistal tip, merus with 3 groups of setae and spines on anterior margin, 2 groups of spines and setae on posterior margin; carpus with 3 groups of spines on anterior tip, 3 groups of spines on posterior margin; propodus with 3 groups of spines on anterior margin, 2 groups of setae on posterior margin; dactylus with 2 simple seta at hinge of nail.
Pereopod 6 (Fig. 5B View Figure 5 ): basis convex, without setae on inner surface, 1 spine at posterodistal portion, with sequential setae posterior margin; with 4 sequential spines on anterior margin; ischium with 2 spines and 1 seta on anterodistal tip; carpus with 3 groups of spine + seta combination on anterior margin, 2 groups of spine + seta combination on posterior margin; propodus with 3 groups of spines on anterior margin, 2 groups of setae on posterior margin, 1 plumose seta on dorsal margin; dactylus with 2 simple setae at hinge of nail.
Pereopod 7 (Fig. 5A View Figure 5 ): basis with a row of 4 spines on anterior margin; serrated; without setae on inner surface; with sequential setae on posterior margin; 1 anterodistal spine; anterodistal corner of ischium with some setae; merus shorter than carpus, 2 groups of small spines on anterior margin, 1 group of spines on posterior margin; some spines and setae on anterodistal and posterodistal corners; carpus 2 with group of small spines on both anterior and posterior margins, some spines and setae on anterodistal and posterodistal corners; propodus same as propodus of pereopod 6, 1 plumose seta on dorsal margin; dactylus with 2 simple seta at hinge of nail.
Uropod 1 (Fig. 6E View Figure 6 ): outer ramus 0.67 and inner ramus 0.68 of length of peduncle, respectively; peduncle bearing 1 proximal spine, 2 inner marginal spines, 2 outer marginal spines; 2 strong ramal spines; 1 inner ramus spine; 1 outer ramus spine; 3 or 4 strong terminal spines.
Uropod 2 (Fig. 6F View Figure 6 ): outer ramus 0.83 and inner ramus 0.81 of length of peduncle, respectively; peduncle bearing 1 proximal spine, 1 inner marginal spine, 1 outer marginal spine; 1 strong ramal spine; 1 inner ramus spine; 1 outer ramus spine; 3 or 4 strong terminal spines.
Uropod 3 (Fig. 3F View Figure 3 ): parviramous, inner ramus with 1 or 2 distal spines accompanied by 1 or 2 setae; peduncle with 2 strong paired spines; endopod/exopod ratio is ~0.21; article 1 of outer ramus with 2 groups of spines and setae on both outer and inner margins (order of setas and spins: 1 spine + 3 or 4 setae); 2 or 3 distal spines and long setae on the exopod; terminal segment short.
Urosomites: all urosomites not elevated; urosome 1 without setae or spines; urosomes 2 and 3 bear 1 seta and 1 spine each.
Telson (Fig. 3C View Figure 3 ): cleft, each lobe with 1 strong distal spine and 2 or 3 long setae; 1 or 2 setae on outer margin and 1 or 2 setae on inner surface of each lobe.
Coxal plate 1 (Fig. 3D View Figure 3 ) rectangular, 2 anterodistal setae and 1 posterodistal seta; lower margin with 4-7 setae; glabrous inner surface.
Coxal plate 2 (Fig. 3E View Figure 3 ) rectangular, 1 anterodistal seta and 1 posterodistal seta; lower margin with 2 or 3 setae; glabrous inner surface.
Coxal plate 3 (Fig. 3G View Figure 3 ) rectangular; 2 anterodistal setae and 1 posterodistal seta; lower margin with sequential setae; glabrous inner surface.
Coxal plate 4 (Fig. 6A View Figure 6 ) excavated, almost equal in width and length; lower margin with sequential setae; 4 setae in the posterior margin; 2 or 3 setae on anterodistal corner; glabrous inner surface.
Coxal plate 5 (Fig. 5C View Figure 5 ): anterior lobe bearing 1 seta and 3 setae on the ventral margin of posterior lobe.
Coxal plate 6 (Fig. 5B View Figure 5 ): posterior lobe bearing 1 seta on ventral margin.
Coxal plate 7 (Fig. 5A View Figure 5 ): posterior lobe bearing 3 setae on ventral margin.
Epimeral plate 1 (Fig. 6B View Figure 6 ) rounded; 1 spine on anterodistal margin, 1 spine on posterodistal margin.
Epimeral plate 2 (Fig. 6C View Figure 6 ) rounded, without point; with two spines on ventral margin, 3 sequential setae on posterior margin.
Epimeral plate 3 (Fig. 6D View Figure 6 ) with 2 spines on ventral margin; 2 or 3 setae on posterior margin, without point posterodistally.
Pleopods 1-3 (Fig. 6B-D View Figure 6 ) subequal; peduncle with some setae and 1 or 2 retinacula; rami with 10 or 11 segments and numerous plumose setae.
Female (Fig. 2 View Figure 2 ). Body 6.8 mm long.
Antenna 1 less setose than that of male, first peduncle segments with long setae on distal portion, with 17-21 segments on flagellum, 2 segments on accessory flagellum. Gnathopod 1 and 2 similar to that of male, setation more intense on propodus, dactyli of gnathopods 1 and 2 long. Uropod 3 similar to that of male, distal part of peduncle with spines; inner and outer margins of outer lobe more densely setose than male outer lobe with row of 2 spine and 5 or 6 setae in each margin. Telson similar to that of male, each lobe with 1 or 2 distal spines accompanied by 1 or 2 setae longer than the spines.
Oostegites present on gnathopod 2 through to pereopod 5.
Variability.
The number of flagellar segments of Antenna 1 was determined as 16 in six paratype individuals, while Antenna 2 had nine flagellar segments. The number of setae on the inner and outer edges of the exopod varied between three and six.
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