Janinella brasiliensis, F & Boulanouar & Coineau, 2014

F, E. Albuquerque, Boulanouar, M. & Coineau, N., 2014, First record of Janinella nom. nov. (Crustacea: Isopoda: Microparasellidae) in the South Atlantic: revision of the genus and description of a new Brazilian species, Journal of Natural History (J. Nat. Hist.) 48 (29 - 30), pp. 1817-1833 : 1818-1824

publication ID	https://doi.org/ 10.1080/00222933.2013.877996
persistent identifier	https://treatment.plazi.org/id/A7486033-FF9F-765B-FE48-F9AAF8C6D710
treatment provided by	Felipe
scientific name	Janinella brasiliensis
status	nom. nov., sp. nov.

Treatment

Janinella brasiliensis View in CoL nom. nov., sp. nov.

Type material. One male holotype ( MNHM 09 View Materials ZTC1 ) , and one male ( MNHM 09 View Materials ZTC3 ) and one female ( MNHM 09 View Materials ZTC2 ) paratype are deposited at the Muséum National d’ Histoire Naturelle of Marrakesh , Morocco. Another paratype

( MNRJ 23549) is deposited at the Museo Nacional de Historia Natural of Rio de Janeiro, Brazil .

Diagnosis

Body long; tiny antennal scale; mandibular incisor with two teeth; male pleopod II with sympod apex pointed and appendix masculina curved and long; long uropodal exopod.

Description

Body minute, elongate, slender, more than seven times longer than broad ( Figure 1A View Figure 1 ). Cephalon slightly longer than wide, with lateral margins rounded, and anterior part straight, without rostrum. Pereion slightly widest at pereionites 1–2. Cephalon, pereionites 1–2 and pleotelson of similar width. Pereionites wider than long. Pereionites 1, 2 and 3 widening towards anterior part with lateral borders of tergites slightly protruding. Pereionite 4 rectangular. Pereionites 5, 6 and 7 expanded posteriorly. First pleonite long (width/length ratio about 1/2) and distinctly narrower than pereionites and pleotelson. Pleotelson longer than wide (width/length ratio approximately 3/2). Pereiopods inserted laterally, under the expanded part of tergites; coxae hardly visible in dorsal view; pereiopods projecting ventrally towards bottom, not visible in dorsal view ( Figure 1A–C View Figure 1 ).

Body lengths from 1.06 to 1.30 mm; females slightly longer than males.

Antennule. Five-segmented. First article longer than wide, with two naked setae and one small distal plumose seta. Second article as long as wide, armed with two naked setae and two short plumose setae, the distal one being longer and passing over distal part of article 3. Article 4 with two short plumose setae; last article almost three times longer than wide with one long aesthetasc and five setae (one plumose) at the tip ( Figure 2A View Figure 2 ).

Antenna ( Figure 2B,C View Figure 2 ). With tiny scale on peduncle article 3, difficult to distinguish and arising from median part of article, rounded at the tip and exhibiting two setae (one proximal, one subdistal); article 5 clearly shorter and slightly wider than article 6; flagellum 8- to 12-segmented, articles slender, all longer than wide, especially the proximal one (width/length 1/3) with two distal setae each.

Mandible ( Figure 2G, H View Figure 2 ). Left mandible: incisor armed with two strong rounded teeth; lacinia mobilis with four small teeth; four bare setae between lacinia and molar process; molar process conical, with three distal naked setae; mandibular palp threesegmented, segment 2 the longest and bearing two subdistal pectinate spines, segment 3 armed with three subdistal fringed spines. Lacinia mobilis lacking on right mandible.

Maxillule ( Figure 2D View Figure 2 ). Inner ramous shorter than outer ramous and relatively wide, with simple lateral and distal setae; outer ramous with lateral setae on margin and 11 apical spines, the longest fringed.

Maxilla ( Figure 2E View Figure 2 ). Inner ramous with several simple long setae on inner and apical margins; outer rami with four fringed long setae.

Maxilliped ( Figure 2F View Figure 2 ). Endite armed with three stout distal setae, four thinner distal setae, subdistal setae and two retinaculae; epipod folded and guttering-like, truncate at the tip, relatively short, reaching medial part of palp first segment; palp five-segmented: first segment short with two setae, second segment longer than wide (width/length ratio 5/6) with two distal setae, third segment wide and more or less rounded with four setae, segments 4 and 5 slender, with several distal setae.

Pereiopods ( Figure 3A–C View Figure 3 ). All pereiopods stocky; basis enlarged with one-two short feathered setae, and one distal seta; two opposite setae on ischium of P1 and P7, only one seta on other pereiopods; merus relatively long, with 3–3 (P1), or 1+2 (P2), or 2 +2 (P3, P4, P5, P6), 1+1 (P7) distal setae; carpus enlarged with one spine and two distal setae (one plumose); propodus with one medial seta (P1, P2) or spine (P3–P7); two subequal short claws.

Small oostegites always present in all females, inserting at proximal part of coxa of pereiopods 2, 3 and 4: triangular thin lamella, distal margin reaching distal part of basis.

Penes short and conical, inserting on posteromedial margin of sternite 7.

Male pleopod 1 ( Figure 4A–C View Figure 4 ). Basal part enlarged; long exopods – according to terminology of Cvetkov (1968) – separated only at more than three-quarters of total length of appendage; apical lobes regularly rounded with four distal long setae each and one small pointed process on outer margin; stylet-guiding groove (Wilson 1987 terminology) running from medial sperm channel to acute terminal lobe process; subdistal lobes rounded at apex, with four or five setae and four triangular thin processes covering lateral channels.

Male pleopod 2 ( Figure 4D View Figure 4 ). Sympod long and narrow, medial distal corner acute, with a row of setules; proximal article of endopod slightly enlarged, appendix

masculina very long, clearly surpassing sympod apex, with a long needle-like apex, exopod displaying a subdistal lobe with a row of setules.

Female pleopod 2 ( Figure 4F View Figure 4 ). Longer than wide, nearly ovate, margins regularly rounded, with two close-set distal setae.

Pleopod 3 ( Figure 4E View Figure 4 ). Endopod provided with three distal plumose setae; exopod long, second article surpassing endopod, with one distal seta.

Pleopod 4. Small, uniramous, finger-like and ovoid.

Pleotelson ( Figure 5A,B View Figure 5 ). Width/length ratio 3/4; widest part at one-third of length; lateral margin subparallel at posterior part; distal margin laterally straight and oblique, then convex and rounded in the medial part, especially in female, armature as in Figure 5A,B View Figure 5 with two subdistal and dorsal plumose setae.

Uropod ( Figure 5C View Figure 5 ). Sympod slightly longer than endopod and not enlarged: width/ length ratio 1/4; endopod longer than exopod (exopod/endopod ratio 4/5), both slender; exopod inserting subterminally; armature as in Figure 5C View Figure 5 .