Paraflagitopisa excavata, Ariyama, Hiroyuki, 2015
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publication ID |
https://doi.org/ 10.11646/zootaxa.3949.1.4 |
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publication LSID |
lsid:zoobank.org:pub:22266A34-5663-4180-91F3-814AA12D8ABE |
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DOI |
https://doi.org/10.5281/zenodo.6108627 |
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persistent identifier |
https://treatment.plazi.org/id/038D5362-FF98-FFC9-FF7D-FBD7FC8BFBDB |
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treatment provided by |
Plazi |
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scientific name |
Paraflagitopisa excavata |
| status |
sp. nov. |
Paraflagitopisa excavata View in CoL sp. nov.
( Figs 1 View FIGURE 1 C, 2–5)
Material examined. Holotype: male (OMNH-Ar-9714), 6.2 mm, off Toyokunizaki coast, Misaki Town, Osaka Prefecture, 34°19'23"N, 135°06'58"E ( Fig. 1 View FIGURE 1 C), 4.1 m in depth, gravel and shell bottom beside rock, together with Gammarella cyclodactyla (Hirayama, 1978) and Abludomelita japonica ( Nagata, 1965) , 6 October 1986, coll. H. Ariyama. Paratypes: 1 male (OMNH-Ar-9715), 4.6 mm, and 1 female (OMNH-Ar-9716), 5.0 mm, same data as holotype.
Description. Male [based on holotype, 6.2 mm (OMNH-Ar-9714) and paratype, 4.6 mm (OMNH-Ar-9715) for right mandible, pereopods 5–7 and pleonal epimera]. Body ( Fig. 2 View FIGURE 2 ) slender, pereonites and pleonites without dorsal setae.
Antenna 1 ( Fig. 3 View FIGURE 3 A, A1) with ratio of lengths of peduncular articles 1–3 1:1.0:0.5, article 1 with bundle of lateral setae and distomedial robust seta; accessory flagellum with seta on tip; primary flagellum with 15 articles, last article with distal seta. Antenna 2 ( Fig. 3 View FIGURE 3 B) with ratio of lengths of peduncular articles 3–5 1:2.6:2.2; flagellum short, with 7 articles, last article with a few distal setae.
Mandible ( Fig. 3 View FIGURE 3 D, D1, E, E1), each incisor bearing 4 cusps, left lacinia mobilis spiniform, right with 4 cusps, accessory blades 5 in left, 7 in right; palp article length ratio 1:2.8: 1.8 in right, article 2 with 4–5 setae ventrally, article 3 with 7 setae. Maxilla 1 ( Fig. 3 View FIGURE 3 G, G1), tip of palp article 2 projected in middle, with 2 robust setae. Maxilla 2 ( Fig. 3 View FIGURE 3 H), inner plate wider than outer. Maxilliped ( Fig. 3 View FIGURE 3 I, I1 – 2), distal end of inner plate bearing 3 short robust setae; outer plate with 8 robust setae; ventral surface of palp article 3 covered with thin setae.
Gnathopod 1 ( Fig. 4 View FIGURE 4 A, A1), coxa roundish; basis widened in distal two thirds, posterior margin with long seta in middle; posterior margin of ischium with seta; lateral and medial surfaces of merus covered with thin setae; posterior margin of carpus setose; propodus about 0.9 times as long as carpus, posterodistal corner with 5 small robust setae medially; dactylus short. Gnathopod 2 ( Fig. 4 View FIGURE 4 B, B1), coxa roundish trapezoidal; basis widened in distal two thirds, posterior margin with 2 long setae in middle; carpus lobed, posterior margin setose; propodus enlarged, about 3.1 times as long as carpus, posterior margin with several bundle of setae, anteromedial surface sparsely setose; palm largely excavated posteriorly, defined by 2 medial robust setae, middle part of palm with 5 lateral and 3 medial short robust setae; dactylus strong, curved.
Pereopods 3–4 ( Fig. 4 View FIGURE 4 C – D), coxae quadrate; posterior margins of bases with several setae; meri slender, widened distally; dactyli narrow, almost straight. Pereopod 5 ( Fig. 4 View FIGURE 4 E, E1), posterior lobe of coxa about 0.6 times as long as anterior lobe; basis relatively wide, posterodistal corner swelled; posterior margin and posterodistal corner of merus each with 2 robust setae; anterodistal and posterodistal corners of carpus with 3 and 4 setae, respectively; anterior margin and anterodistal and posterodistal corners of propodus bearing 2, 1 and 1 robust setae, respectively; dactylus narrow. Pereopod 6 ( Fig. 4 View FIGURE 4 F, F1) about 1.4 times as long as pereopod 5; posterior lobe of coxa about 0.7 times as long as anterior lobe; basis relatively wide, posterodistal corner swelled; posterior margin and posterodistal corner of merus each with 2 robust setae; anterodistal and posterodistal corners of carpus with 5 and 3 setae, respectively; anterior margin and anterodistal and posterodistal corners of propodus bearing 3, 1 and 1 robust setae, respectively; dactylus narrow. Pereopod 7 ( Fig. 4 View FIGURE 4 G, G1) about 1.3 times as long as pereopod 6; coxa trapezoidal; basis relatively wide, posterodistal corner swelled; posterior margin and posterodistal corner of merus each with 3 setae; anterior and posterior margins of carpus setose, anterodistal and posterodistal corners with 2 and 7 setae, respectively; anterior and posterior margins of propodus setose; dactylus narrow.
Pleonal epimera ( Fig. 5 View FIGURE 5 A), epimeron 2 with thick seta ventrally, posteroventral corner with minute seta; epimeron 3 with 1 thick and 1 thin setae ventrally, posteroventral corner minutely projected, bearing minute seta. Pleopods 1–3 ( Fig. 5 View FIGURE 5 B – D), pleopod 3 shortest; peduncles each with distal projection; inner and outer rami with 10 and 11 articles in pleopod 1, 9 and 10 articles in pleopod 2, and 8 and 9 articles in pleopod 3, respectively. Uropod 1 ( Fig. 5 View FIGURE 5 E) long; peduncle long, bearing 2 ventrofacial, 4 dorsomedial, 6 dorsolateral and 1 medial robust setae, distomedial and distolateral corners with 2 and 1 long robust setae, respectively; inner ramus 63 % length of peduncle, with 1 medial, 1 lateral and 3 distal robust setae; outer ramus 56 % length of peduncle, with 2 medial and 4 distal robust setae. Uropod 2 ( Fig. 5 View FIGURE 5 F) short, about 0.7 times as long as uropod 1; peduncle short, bearing 3 dorsomedial robust setae, distomedial and distolateral corners with 2 and 1 robust setae, respectively; inner ramus about same length as peduncle, with 3 medial and 5 distal robust setae; outer ramus 83 % length of peduncle, with 1 medial, 3 lateral and 3 distal robust setae. Uropod 3 ( Fig. 5 View FIGURE 5 G) very large, about 1.9 times as long as uropod 1; peduncle short, with 2 ventral robust setae, distolateral corner bearing 4 setae; inner ramus about 1.8 times as long as peduncle, with 3 medial, 3 lateral and 4 distal robust setae; outer ramus about 5.3 times as long as peduncle, article 1 with several medial and 2 lateral setae, distomedial and distolateral corners with 6 and 2 robust setae, respectively, article 2 almost same length as article 1, with several setae on medial and lateral margins, distal margin setose. Telson ( Fig. 5 View FIGURE 5 H), breadth subequal to length; lateral margins with 1–2 robust setae, distal margins bearing 2–3 robust setae, dorsal surface with 2 pairs of plumose setae.
Female [paratype, 5.0 mm (OMNH-Ar-9716)]. Generally similar to male except for gnathopods and oostegites. Gnathopod 1 ( Fig. 5 View FIGURE 5 I, I1), coxa rhomboidal; basis narrower, carpus and propodus wider than that of male; propodus 96 % as long as carpus, posterodistal corner with 4 small robust setae medially. Gnathopod 2 ( Fig. 5 View FIGURE 5 J, J1) smaller than that of male; coxa narrower; propodus shorter, about 1.6 times as long as carpus, palm smoothly curved, defined by 2 medial robust setae, posterior margin with several bundle of setae, anteromedial surface setose; dactylus slender.
Etymology. From the Latin excavata (= excavate), referring to the shape of male gnathopod 2.
Habitat. Marine, subtidal. Among gravel and shell.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.