Lucioblivio KOZAENSIS TOMIKAWA 2007, SP. NOV.
Creators: name: Tomikawa, Ko
name: Kobayashi, Norio
name: Morino, Hiroshi
name: Mawatari, Shunsuke F.
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Luciobliviidae
Lucioblivio

description: LUCIOBLIVIO KOZAENSIS TOMIKAWA 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. 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, 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.
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): shorter than pereonites 1 and 2 combined; inferior antennal sinus shallow; eyes absent; rostrum short; lateral cephalic lobe weakly pointed. Antenna 1 (Fig. 14A): 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); primary flagellum 20-articulate, each article with 1 aesthetasc, calceoli lacking (Fig. 14C). Antenna 2 (Fig. 14D): 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); flagellum 11- articulate, articles with calceoli.
Pereonites 1–7 (Fig. 13): smooth, with fine setae. Pleonites 1–3 (Fig. 15E–G): 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); anterior lobe of coxae 5–6 dominant (Fig. 17E, F); coxa 7 shallow, 0.5 × as deep as wide (Fig. 17H). Urosomites 1–3 (Fig. 15H–J): dorsal margin with pair of robust setae.
Upper lip (Fig. 14F): ventral margin truncate, lacking marginal setae. Lower lip (Fig. 14G): outer lobes broad, shoulder acute, inner lobes fused, indistinct. Mandible (Fig. 14H): left and right incisors 5- and 4-dentate, respectively (Fig. 14I, K); left lacinia mobilis 4-dentate (Fig. 14I), right lacinia finely dentate (Fig. 14K); 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). Maxilla 1 (Fig. 14L): inner plate ovate, with 2 apical plumose setae; outer plate with seven robust serrate setae (Fig. 14N); palp article 2 with 3 robust setae and 5 slender setae apically (Fig. 14M). Maxilla 2 (Fig. 14O): inner plate with 2 plumose facial setae in oblique row. Maxilliped (Fig. 15A): inner plate short, reaching base of palp article 1, quadrate, apically with 1 robust seta and 2 weakly plumose setae (Fig. 15B); outer plate narrowing distally, not reaching middle of palp article 2, with row of robust setae extending from apex along medial margin (Fig. 15C); 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): 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); dactylus curved, posterior margin smooth (Fig. 16B). Gnathopod 2 (Fig. 16C): 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); dactylus curved, posterior margin smooth (Fig. 16D).
Pereopod 3 (Fig. 17A): 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). Pereopod 4 (Fig. 17C): 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). Pereopod 5 (Fig. 17E): 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): 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). Pereopod 7 (Fig. 17H): 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).
Brood plates: narrow, lacking brood setae, on pereopods 2–5. Pleopods (Fig. 17J, M, N): peduncle and rami long; retinacula paired, without associate setae (Fig. 17K); inner basal margin of inner ramus of pleopods 1–3 with 3, 2, and 2 bifid setae, respectively (Fig. 17L); outer ramus 12-, inner ramus 9-articulate. Epimeral plates 1–3 (Fig. 15K–M): not pointed posterodistally, lacking ventromarginal setae, posterior margins with 1, 1, and 3 setae, respectively.
Uropod 1 (Fig. 15N): 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): 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): 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): 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), stalk, and bulla well developed; concavity of proximal element shallow; distal element with ten well-defined transverse bands. Lacinia mobilis of right mandible not bifid (Fig. 18C, D); molar weak, not tritulative (Fig. 18C, E).
Remarks: This species occurs sympatrically with Eoniphargus kojimai at Seto River, Shizuoka Prefecture, and with Octopupilla felix at Koza River, Wakayama Prefecture.
description: Published as part of 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), pp. 643-670 in Zoological Journal of the Linnean Society 149 (4) on pages 661-668, DOI: 10.1111/j.1096-3642.2007.00277.x, http://zenodo.org/record/4634851