Paraleptognathia fastuosa, Guerrero-Kommritz, 2004

Guerrero-Kommritz, Jürgen, 2004, A revision of the genus Paraleptognathia Kudinova-Pasternak, 1981 (Crustacea: Tanaidacea) and description of four new species, Zootaxa 481 (1), pp. 1-63 : 52-56

Paraleptognathia fastuosa n. sp. ( Fig.24 , 25 )

Material examined: Ten individuals. Holotype ZMH K­40628 RV ”Meteor” 48 St. 344, one female . Paratypes ZMB 27521 RV ”Meteor” 48 St. 345, one female , ZMH K­40629 RV ”Meteor” 48 St. 340, four females (one dissected) , two males , ZMH K­40630 RV ”Meteor” 48 St. 340, two females .

Diagnosis: Cheliped carpus long carpal shield small; propodus of pereopod 1 with spinules; pereon with prominent pereopod shoulders.

Description: non­ovigerous female. Body ( Fig. 24a, b ): about 6.5 times as long as broad. Body length 2.3 to 4.3 mm. Cephalothorax ( Fig. 24a, b ): oval shaped, about 1.2 times longer than broad. Pereon ( Fig. 24a, b ): pereonite 6 shortest, pereonite 1 as long as 5 and shorter than 2, pereonite 2, 3, 4 subequal. Pleon ( Fig. 24a, b ): pleonite 5 longest, pleonites 1, 2, 3, 4 subequal; pleonites 2, 3, 4, 5 with lateral simple setae; pleotelson pentameral.

Antennule ( Fig. 24c ): article 1 longest, with one long seta; article 2 with four short simple setae; article 3 shortest, with three terminal simple setae; article 4 with five terminal setae.

Antenna ( Fig. 24e ): article 1 short, semifused to cephalothorax; article 2 as long as wide, with one short spiniform dorsal seta; article 3 with one simple distal seta; article 4 longest, with two distal simple long, one distal short and one short simple setae at midlength; article 5 with one simple long distal seta; article 6 shortest, with four terminal simple setae.

Labrum ( Fig. 25e ): hood­shaped, with a row of setules on the distal lateral margins.

Mandible ( Fig. 25d ): well calcified; pars molaris bent ventrally; lacinia mobilis spiniform, blunt.

Maxillula ( Fig. 25b ): endite with 14 rows of setules dorsally and four ventral rows. One short, two pinnate and four simple terminal spiniform setae.

Maxilla ( Fig. 25g ): no special features.

Labium ( Fig. 25f ): composed of two triangular lobes with a row of setules at the distal edge.

Maxilliped ( Fig. 25h ): endites smooth, basis tongue­shaped.

Epignath ( Fig. 25c ): as long as maxillula, with no special feature.

Cheliped ( Fig. 25a ): basis shorter than carpus; merus with one ventral simple seta; carpus with one ventral and two dorsal simple setae, carpal shield small, one tubercle near chela insertion, propodus slender, smooth, with three teeth at cutting edge, dactylus smooth.

Pereopod 1 ( Fig. 24g ): coxa naked, basis about four times as long as broad, with one setulose seta; ischium short, with one simple seta; merus with one spiniform seta; carpus with two spiniform setae; propodus with ventral row of spinules, terminal spine and a terminal short spiniform seta; dactylus smooth.

Pereopod 2 ( Fig. 24h ): as pereopod 1, except basis with one extra simple seta.

Pereopod 3 ( Fig. 24i ): as pereopod 1, except carpus with three spiniform setae and propodus lacks short spiniform seta.

Pereopod 4 ( Fig. 24j ): basis about four times as long as broad, with one setulose seta; ischium short, with two simple setae; merus with two spiniform setae; carpus with three spiniform setae; propodus with three terminal spiniform setae; dactylus with no special features.

Pereopod 5 ( Fig. 24k ): as pereopod 4, except basis with three setulose setae.

Pereopod 6 ( Fig. 24l ): as pereopod 4, except carpus and propodus have four spiniform setae.

Pleopods: absent.

Uropods ( Fig. 24f ): exopod half the length of article 1 of endopod. Exopod article 1 with one simple seta; article 2 with two terminal simple setae. Article 1 of endopod with two simple distal setae; article 2 with seven terminal setae.

Juvenile male body length 2.6 to 3.0 mm. Antennule, article 1 longest, with one distal simple seta; article 2 naked; article 3 with one distal simple setae; article 4 shortest, with two distal setae; article 5 with three terminal setae.

Type locality: South Atlantic Ocean , Angola Basin, RV ”Meteor” 48 St. 344, 17° 04.9´S 04° 40.8´E – 17° 07.5´S 04° 42.3´E, 5415 m .

Etymology: in Latin fastuosus means proud, the proud Paraleptognathia .

Distribution: South Atlantic Ocean, Angola Basin.

Remarks: the cheliped with small carpal shield and long carpus is similar to that of P. alba . The cephalothorax is as long as the pleon in P. alba , in P. fastuosa the pleon is longer than the cephalothorax. The propodus of P1 is smooth in P. alba and bears spinules in P.fastuosa .

Figures

FIGURE 24. Paraleptognathia fastuosa ZMH K­40628 a. Body, dorsal view, b. Body, lateral view. Scale bar 1mm. ZMH K­40629 c. Antennule, d. Antennule juvenile male, e. Antenna, f. Uropod, g. Pereopod 1, h. Pereopod 2, i. Pereopod 3, j. Pereopod 4, k. Pereopod 5, l. Pereopod 6. Scale bar 0.25 mm.

FIGURE 25. Paraleptognathia fastuosa ZMH K­40629 a. Cheliped. Scale bar 0.25 mm. b. Maxillula, c. Epignath, d. Mandibles, e. Labrum, f. Labium, g. Maxilla, h. Maxilliped. Scale bar 0.1 mm.