Lucioblivio kozaensis, 2007

Tomikawa, Ko, Kobayashi, Norio, Morino, Hiroshi & Mawatari, Shunsuke F., 2007, New gammaroid family, genera and species from subterranean waters of Japan, and their phylogenetic relationships (Crustacea: Amphipoda), Zoological Journal of the Linnean Society 149 (4), pp. 643-670 : 661-668

publication ID	https://doi.org/ 10.1111/j.1096-3642.2007.00277.x
DOI	https://doi.org/10.5281/zenodo.10544997
persistent identifier	https://treatment.plazi.org/id/2F5F550F-FFA5-FFA5-D9DA-673667A00197
treatment provided by	Felipe
scientific name	Lucioblivio kozaensis
status	sp. nov.

Treatment

LUCIOBLIVIO KOZAENSIS TOMIKAWA View in CoL SP. NOV.

Type material: Holotype: female, 6.3 mm (appendages on slides and carcass in ethanol), NSMT-Cr 16662, shallow riverbed of the Koza River (33°32′10″N, 135°47′47″E), Kozagawa Town , Wakayama Prefecture, 11.iii.2004, collected by N. Matsumoto. GoogleMaps Paratypes: two females, 4.2 mm (appendages on slide and carcass in ethanol), 3.4 mm (ethanol), NSMT-Cr 16663–16664, from 20 cm depth on the bank of the Seto River (34°52′50″N, 138°13′08″E), Terajima, Fujieda City , Shizuoka Prefecture, 3.xi.2004 GoogleMaps , collected by T. Torii; two females, 6.5 mm (appendages on slides and carcass in ethanol), 4.9 mm (ethanol), NSMT-Cr 16665– 16666, shallow riverbed of the Kirime River (33°47′N, 135°14′E), Inami Town , Wakayama Prefecture, February 2001, collected by K. Nishi. GoogleMaps

Specimen for SEM observation: Female, 5.6 mm, data as for holotype.

Etymology: The species name is from the Latinized Japanese kozaensis (of Koza), referring to the type locality of the new species.

Description: Holotype, female, NSMT-Cr 16662. Head ( Fig. 13 View Figure 13 ): shorter than pereonites 1 and 2 combined; inferior antennal sinus shallow; eyes absent; rostrum short; lateral cephalic lobe weakly pointed. Antenna 1 ( Fig. 14A View Figure 14 ): length about 0.6 × body length; peduncular articles 1, 2 and 3 with length rations 1.0: 0.9: 0.3; posterior margin of article 1 with 3 robust setae, posterodistal part with single robust seta; articles 2–3 with lateral and medial setae; accessory flagellum 2- articulate ( Fig. 14B View Figure 14 ); primary flagellum 20-articulate, each article with 1 aesthetasc, calceoli lacking ( Fig. 14C View Figure 14 ). Antenna 2 ( Fig. 14D View Figure 14 ): about half the length of antenna 1; peduncular articles 4–5 with lateral and medial setae; length of article 4 1.3 × length of article 5; article 5 with 5 calceoli ( Fig. 14E View Figure 14 ); flagellum 11- articulate, articles with calceoli.

Pereonites 1–7 ( Fig. 13 View Figure 13 ): smooth, with fine setae. Pleonites 1–3 ( Fig. 15E–G View Figure 15 ): dorsal margin of each with 4 setae. Coxae: coxae 1–4 with marginal and facial setae; posterior margin of coxa 4 widely excavate ( Fig. 17C View Figure 17 ); anterior lobe of coxae 5–6 dominant ( Fig. 17E, F View Figure 17 ); coxa 7 shallow, 0.5 × as deep as wide ( Fig. 17H View Figure 17 ). Urosomites 1–3 ( Fig. 15H–J View Figure 15 ): dorsal margin with pair of robust setae.

Upper lip ( Fig. 14F View Figure 14 ): ventral margin truncate, lacking marginal setae. Lower lip ( Fig. 14G View Figure 14 ): outer lobes broad, shoulder acute, inner lobes fused, indistinct. Mandible ( Fig. 14H View Figure 14 ): left and right incisors 5- and 4-dentate, respectively ( Fig. 14I, K View Figure 14 ); left lacinia mobilis 4-dentate ( Fig. 14I View Figure 14 ), right lacinia finely dentate ( Fig. 14K View Figure 14 ); molar weak, not triturative, without seta; palp articles 1, 2 and 3 with length ratios 1.0: 2.5: 2.5; article 1 unarmed; article 2 with 12 marginal setae; article 3 with 2 A-setae, pair of B-setae, many D- setae, and Esetae, outer face without fine setae, apical margin with fine setae ( Fig. 14J View Figure 14 ). Maxilla 1 ( Fig. 14L View Figure 14 ): inner plate ovate, with 2 apical plumose setae; outer plate with seven robust serrate setae ( Fig. 14N View Figure 14 ); palp article 2 with 3 robust setae and 5 slender setae apically ( Fig. 14M View Figure 14 ). Maxilla 2 ( Fig. 14O View Figure 14 ): inner plate with 2 plumose facial setae in oblique row. Maxilliped ( Fig. 15A View Figure 15 ): inner plate short, reaching base of palp article 1, quadrate, apically with 1 robust seta and 2 weakly plumose setae ( Fig. 15B View Figure 15 ); outer plate narrowing distally, not reaching middle of palp article 2, with row of robust setae extending from apex along medial margin ( Fig. 15C View Figure 15 ); palp article 2 long, length 1.9 × length of article 1 and 1.8 × length of article 3; articles 2 and 3 medially setose, article 3 with apical lobe.

Gnathopods: dissimilar in size and form. Gnathopod 1 ( Fig. 16A View Figure 16 ): anterior and posterior margins of basis with long setae; ischium and merus short, ventral margin of merus setose; carpus short, length 0.3 × length of propodus, not lobate, with medial setae, ventral margin lined with setae; propodus stout, palm lined with small triangular protuberances, 16 robust setae, inner distal corner with 3 robust setae ( Fig. 16B View Figure 16 ); dactylus curved, posterior margin smooth ( Fig. 16B View Figure 16 ). Gnathopod 2 ( Fig. 16C View Figure 16 ): anterior and posterior margins of basis with long setae; carpus long, length 0.6 × length of propodus, with medial setae, not lobate, ventral margin lined with setae; propodus more slender than that of gnathopod 1, palm lined with small triangular protuberances, 12 robust setae, inner distal corner with 2 robust setae ( Fig. 16D View Figure 16 ); dactylus curved, posterior margin smooth ( Fig. 16D View Figure 16 ).

Pereopod 3 ( Fig. 17A View Figure 17 ): slender, anteroproximal and posterior margins of basis with long setae; ischium short, almost as long as width; length ratios of merus, carpus and propodus = 1.0: 1.0: 0.8, with short setae marginally; length of dactylus 0.4 × length of propodus, anteroproximal and posterior margin each with single seta ( Fig. 17B View Figure 17 ). Pereopod 4 ( Fig. 17C View Figure 17 ): like pereopod 3, except: length ratios of merus, carpus and propodus = 1.0: 1.1: 1.0; length of dactylus 0.3 × length of propodus ( Fig. 17D View Figure 17 ). Pereopod 5 ( Fig. 17E View Figure 17 ): anterior margin of basis with robust setae, posterior margin with fine setae, posteroventral lobe rounded; ischium short, about as long as wide; merus–dactylus missing. Pereopod 6 ( Fig. 17F View Figure 17 ): like pereopod 5, except: length of ischium 1.2 × its width; length ratios of merus, carpus and propodus = 1.0: 1.4: 1.4; dactylus slender, length 0.2 × length of propodus, with short seta anteriorly ( Fig. 17G View Figure 17 ). Pereopod 7 ( Fig. 17H View Figure 17 ): like pereopod 5, except: ischium short, length 0.9 × width; length ratios of merus, carpus and propodus = 1.0: 1.4: 1.4; dactylus stout, length 0.2 × length of propodus, with anterior seta ( Fig. 17I View Figure 17 ).

Brood plates: narrow, lacking brood setae, on pereopods 2–5. Pleopods ( Fig. 17J, M, N View Figure 17 ): peduncle and rami long; retinacula paired, without associate setae ( Fig. 17K View Figure 17 ); inner basal margin of inner ramus of pleopods 1–3 with 3, 2, and 2 bifid setae, respectively ( Fig. 17L View Figure 17 ); outer ramus 12-, inner ramus 9-articulate. Epimeral plates 1–3 ( Fig. 15K–M View Figure 15 ): not pointed posterodistally, lacking ventromarginal setae, posterior margins with 1, 1, and 3 setae, respectively.

Uropod 1 ( Fig. 15N View Figure 15 ): length of peduncle 1.2 × length of inner ramus, with robust setae on dorsolateral and dorsomedial margins, and with 4 basofacial robust setae; length of outer ramus 0.9 × length of inner ramus, outer and inner margins each with 2 robust setae; outer and inner margins of inner ramus with 2 and 4 robust setae, respectively. Uropod 2 ( Fig. 15O View Figure 15 ): length of peduncle 0.8 × length of inner ramus, with robust setae on dorsolateral and dorsomedial margins; length of outer ramus 0.6 × length of inner ramus, with 3 robust setae dorsally; outer and inner margins of inner ramus with 2 and 4 robust setae, respectively. Uropod 3 ( Fig. 15P–R View Figure 15 ): length of peduncle 0.4 × length of inner ramus, with single robust seta; outer ramus uniarticulate, outer margin with pair of robust setae and 2 clusters of robust setae, and single robust seta; inner margin with single simple seta, 2 robust setae, and 2 pairs of robust setae; inner ramus long, length 0.9 × length of outer ramus, outer margin with single simple seta and 3 robust setae. Telson ( Fig. 15S View Figure 15 ): length 1.6 × basal maximum width, dorsolateral margins with 2 robust setae and 2 fine setae, each lobe with robust seta apically; cleft 48%.

SEM observation: One female was observed via SEM. Calceolus ( Fig. 18A, B View Figure 18 ), stalk, and bulla well developed; concavity of proximal element shallow; distal

Eogammarus kygi

Locustogammarus locustoides

Barrowgammarus macginitiei

Jesogammarus jesoensis

Spasskogammarus spasskii

Anisogammarus pugettensis

Carineogammarus makarovi

Lucioblivio kozaensis

Gammarus nipponensis

Mesogammarus melitoides

0.02

Figure 19. A, strict consensus tree obtained by maximum parsimony analysis; B, neighbour-joining tree. Numbers near branches indicate bootstrap values> 50%. Trees rooted by the outgroup taxon Melita sp.

element with ten well-defined transverse bands. Lacinia mobilis of right mandible not bifid ( Fig. 18C, D View Figure 18 ); molar weak, not tritulative ( Fig. 18C, E View Figure 18 ).

Remarks: This species occurs sympatrically with Eoniphargus kojimai at Seto River, Shizuoka Prefecture, and with Octopupilla felix at Koza River, Wakayama Prefecture.