Kudinopasternakia trispinosa, Santos, Kátia Christol Dos, 2007

Santos, Kátia Christol Dos, 2007, Three new species of Kudinopasternakia Guţu, 1991 (Crustacea: Tanaidacea: Sphyrapodidae) from Brazilian waters, Zootaxa 1666, pp. 23-41 : 33-40

Kudinopasternakia trispinosa n. sp.

( Fig 7–11 )

Material examined: Holotype, 1 female without oostegites, MZUSP 17.929, 230 m, Sta. 015; Allotype, 1 male, MZUSP 17.930, 230 m, Sta. 015; 1 manca, MZUSP 17.928, 240 m, Sta. 010;

Diagnosis. Rostrum pointed; pereopod 1 carpus and propodus with three ventral cuspidate setae each; pereopod 4 propodus with two dorsodistal thick setae; pleonites with pointed epimera.

Description of female. Body ( Fig.7 a, b) 2.9mm long, semicylindrical, dorsoventrally flattened, 5 times as long as the cephalothorax length. Rostrum pointed. Eye lobes present, without visual elements. Cephalothorax not fused with pereonite 1 with the same length of pereonites 3 to 4 or 4 to 5 together.

Pereon 2.6 times the cephalothorax length; six free pereonites, pereonite 6 shortest; pereonite 4 longest.

Pleon with five laterally produced and pointed pleonites, pleotelson as long as broad, pointed terminally.

Antennule ( Fig.8 a) article 1 almost 3 times as long as broad, with unequal setae, three on inner margin, five simple and one broom setae on outer margin; article 2 as long as broad, with two setae on inner, three on outer margin; article 3 broader than long with one distal seta on each margin; common article naked; inner flagellum with two articles, first with one distal setae, second with four terminal setae; outer flagellum with four articles, first three with one distal seta, last article bearing four terminal setae.

Antenna ( Fig.8 c) 10-articulate; first article tumid, with part of the surface ridged, wider than following articles; article 2 shorter than article 4, with pseudosquama bearing one long seta terminally; article 3 with one distoventral seta; article 4 longer than other articles, with five broom and two simple setae; article 5 and 9 naked; articles 6 to 8 with one distal seta on each margin; last article bearing three terminal setae.

Mandible left pars incisiva ( Fig.8 d) with five prominent teeth, lacinia mobilis bifurcated with serrate margin; right pars incisiva ( Fig.8 e) with four teeth; palp ( Fig.8 f) tri-articulate; article 2 with three ventrodistal setulose setae; article 3 with two rows of half setulose setae and three setulose setae distally.

Maxillule ( Fig. 8 g) outer endite with eleven terminal spiniform setae bearing setules on both margins; inner endite with four pinnate setae; palp having distal article armed with one terminal simple setae and other two subterminally (broken).

Maxilla ( Fig.8 h) Outer lobe of movable endite with six simple setae and setules on outer subdistal margin; inner lobe of movable endite with two setae; outer lobe of fixed endite with two simple, one basally–inflated and three unequal bifurcated setae; inner lobe of fixed endite with about twenty–one basally–inflated setae.

Maxilliped ( Fig.9 a) coxa damaged on dissection; basis with six spinules along dorso—outer margin; palp 4–articled, article 1as long as broad, with one outer and one inner setae; article 2 with one seta on outer and eight on inner margin; article 3 with seven setae on inner margin; article 4 with seven setae terminally; endite with three simple setae terminally, four circumplumose bifid setae, one setulated bifid seta, four basally– inflated setae, and two coupling hooks.

Cheliped ( Fig.9 b) basis with two short setae, exopod with four terminal plumose setae; merus with one ventral and one short subventral setae distally; carpus longer than merus with four ventral setae; fixed finger of propodus with three ventral and three dorsal setae; two setae on the articulation of the dactylus; dactylus with clump of setae. Teeth on grasping and/or cutting edges of propodus and dactylus as figured.

Pereopod 1 ( Fig.9 c, d) basis almost 1.6 times the merus length; exopod with four terminal setae; ischium with one distoventral seta; ventral margin of the merus with seven simple and one distal cuspidate setae. Carpus 0.8 times merus length, three cuspidate setae distoventrally, row of simple setae on dorsal margin and one cuspidate setae distodorsally. Propodus with ventral margin bearing three cuspidate setae; dorsal edge with simple setae, two cuspidate setae distally. Dactylus smaller than propodus, with two spines on ventral margin. Ventral margin of carpus and propodus stepped at insertion of cuspidate.

Pereopod 2 ( Fig.10 a) basis shorter than merus, carpus and propodus combined, with one short distoventral seta; ischium with one distoventral seta; merus with three ventral and one short distodorsal setae; carpus with six ventral, three subdorsal and one distodorsal setae; propodus with six ventral, one subdorsal and two distodorsal setae; dactylus longer than propodus, with small seta near junction with unguis; distoventral margin of unguis finelly serrate.

Pereopod 3 ( Fig.10 b) similar to pereopod 2; merus with two distoventral setae; carpus with two subdorsal setae; propodus with four ventral, two distodorsal and one subterminal setae.

Pereopod 4 ( Fig.10 c) basis with one broom seta on each margin near mid point; ischium and merus with one distoventral seta; carpus with two distoventral, one distodorsal and two subterminal setae; propodus with a row of long half–serrate setae terminally, two bifurcated setae distodorsally, with tiny spiniform setae on its proximal half, one broom seta medially on dorsal margin, three setae ventrally; dactylus as pereopod 3.

Pereopod 5 ( Fig.11 a) basis with two dorsal and one ventral broom setae; ischium with one distodorsal seta; merus with one distal seta on each margin; merus with five ventral, one distodorsal and one subterminal setae; propodus with diagonal row of half setulate setae subventrally and three setae ventrally, one spiniform and one thick half proximal serrate setae, distoventrally.

Pereopod 6 ( Fig.11 b) similar to pereopod 5, basis naked; merus with two distoventral setae; carpus with three ventral setae; propodus with additional short broom setae on distal half of dorsal margin; dactylus with one short dorsodistal seta.

Pleopod ( Fig.11 c) basal article with one plumose seta distally; endopod with one plumose seta medially, seven unequal long plumose setae; exopod bi-articulate, article 1 with one long plumose seta distally, article 2 with eight unequal plumose setae.

Uropod ( Fig.11 d) basis 3 times as long as wide, with one seta on inner margin; exopod bi-articulate, two long setae distally; endopod broken, articles 1, 3 and 6 with broom setae on inner and simple setae on outer margins, articles 2, 4 and 7 with one short simple seta.

Sexual dimorphism. Male ( Fig.7 c) antennule ( Fig.8 b) inner flagellum with seven articles bearing several aesthetascs, outer flagellum with three articles. Cheliped carpus broader than long, with both margins bearing frill-like ornamentation. Propodus fixed finger and dactylus with spiniform setae on ventral margins. Dactylus with inflated ending. Pereopod 1 proportionally larger than that of the female when compared to total body length. Carpus of pereopod 1 with two or three cuspidate setae ( Fig.9 e, f). Pereopod 4 with one additional cuspidate seta ventrally ( Fig. 10 d).

Other stages. Manca ( Fig.7 d) with 7-articled exopods found on pereopods 4 and 5 ( Fig. 7 e).

Etymology. From the Latin, trispinosa (with three spines), relating to the number of cuspidate setae on the ventral propodal margin of pereopod 1, following the terminology of K. bispinosa Guţu & Heard, 2002.

Type-locality: Santos Basin, 24° 18’ S – 44° 04’ W, 230 m.

Geographic d istribution. Brazil, Santos Basin, 230m.

Remarks. Kudinopasternakia trispinosa n. sp. also has compound distodorsal setae on the propodus of pereopod 4 as seen in K. bispinosa but, instead of it bearing five foliaceous lobes, that of the new species has three lobes with tiny spiniform setae on their proximal half. Besides feature and the ornamentation of pereopod 1, the new species differs from K. bispinosa by having pleonites pointed laterally.

The other Kudinopasternakia species that has compound distodorsal setae on the propodal margin of pereopod 4 is K. amazonica n. sp., but that species lacks foliaceous lobes on top, apart from several spiniform setae ventrally.

Key to the genus Kudinopasternakia Gu ţ u, 1991

1 Pereopod 1 propodus with two cuspidate setae on ventral margin............................................ K. bispinosa

- Pereopod 1 propodus with more than two cuspidate setae on ventral margin............................................. 2

2 Pereopod 1 propodus with three cuspidate setae on ventral margin............................................................ 3

- Pereopod 1 propodus with more than three cuspidate setae on ventral margin........................................... 4

3 Pereopod 1 carpus with two cuspidate setae on ventral margin, pleonites rounded laterally........................ ...................................................................................................................................... K. brasiliensis n. sp.

- Pereopod 1 carpus with three cuspidate setae on ventral margin, pleonites pointed laterally....................... ......................................................................................................................................... K. trispinosa n. sp.

4 Rostrum pointed........................................................................................................................................... 5

- Rostrum rounded ........................................................................................................... K. amazonica n. sp.

5 Pereopod 1 carpus with four cuspidate setae, pleonites pointed laterally ................................................... 7

- Pereopod 1 carpus with two or three cuspidate setae, pleonites rounded laterally...................................... 6

6 Pereopod 1 carpus with three, propodus with four cuspidate setae on ventral margin ...... K. balanorostrata

- Pereopod 1 carpus with two, propodus with five cuspidate setae on ventral margin ........................ K. siegi

7 Pereopod 1 propodus with four cuspidate setae on ventral margin; antennule outer flagellum with eight articles ............................................................................................................................................. K. larisae

- Pereopod 1 propodus with five cuspidate setae on ventral margin; antennule outer flagellum with four arti- cles .................................................................................................................................................. K. dispar

Figures

FIGURE 7. Kudinopasternakia trispinosa n. sp. Female (2.9 mm) (a) dorsal view, (b) lateral view. Male (3.0 mm) (c) lateral view. Manca (0.4 mm) (d) lateral view, (e) exopods of pereopods 4 and 5 enlarged.

FIGURE 8. Kudinopasternakia trispinosa n. sp. Female (2.9 mm) (a) antennule, (b) same, male, (c) antenna; mandible, (d) left mandible, distal, (e) right mandible, distal, (f) palp; (g) maxillule, (h) maxilla.

FIGURE 9. Kudinopasternakia trispinosa n. sp. Female (2.9 mm) (a) maxilliped, (b) cheliped, (c) pereopod 1, (d) same, enlarged. Male (3.0 mm) (e, f) pereopod 1 distal articles.

FIGURE 10. Kudinopasternakia trispinosa n. sp. Female (2.9 mm) (a) pereopod 2, (b) pereopod 3, (c) pereopod 4. Male (3.0 mm)

FIGURE 11. Kudinopasternakia trispinosa n. sp. Female (2.9 mm) (a) pereopod 5, (b) pereopod 6, (c) pleopod, (d) uropod.