Paraleptognathia weddellensis (Sieg, 1986) 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 : 42-45

publication ID	https://doi.org/ 10.11646/zootaxa.481.1.1
publication LSID	lsid:zoobank.org:pub:8B7F424B-FED5-4EEC-955E-1886C252909B
persistent identifier	https://treatment.plazi.org/id/03FB8794-FF95-B332-E927-0FC8FB90FB31
treatment provided by	Felipe
scientific name	Paraleptognathia weddellensis (Sieg, 1986)
status	comb. nov.

Treatment

Paraleptognathia weddellensis (Sieg, 1986) View in CoL new combination ( Figs 18 View FIGURE 18 , 19 View FIGURE 19 )

Synonymy: Akanthoporeus weddellensis Sieg, 1986

Material examined: Ten individuals. ZMH K40600 RV ”Walther Herwig” St. 106, one female , ZMH K40601 RV ”Polarstern” St. 91, one juvenile male, ZMH K40602 RV ”Polarstern” St. 145, one female , one neuter, ZMH K40603 RV ”Polarstern” St. 147, four females (one dissected) , ZMH K40604 RV ”Polarstern” St. 153, one female , ZMH K 40605 RV ”Polarstern” St. 147, one female .

Diagnosis: Cheliped carpal shield well developed, smooth. Propodus of pereopod 1 and 2 with spinules.

Description: nonovigerous female. Body ( Fig. 18a, b View FIGURE 18 ): long, about 7.5 times longer than broad. Body length 1.4 to 2.8 mm. Cephalothorax ( Fig. 18a, b View FIGURE 18 ): about 1.3 times longer than broad. Pereon ( Fig. 18a, b View FIGURE 18 ): pereonite 1 as long as pereonite 6; pereonite 5 as long as pereonite 3 and longer than 6; pereonite 2 and 4 subequal. Pleon ( Fig. 18a, b View FIGURE 18 ): pleonite 1 and 3 longest, pleonites 2, 4, 5 subequal.

Antennule ( Fig. 18d View FIGURE 18 ): article 1 longest, with one long and two short simple setae; article 2 with one long simple and one short simple setae; article 3 shortest, with two terminal simple setae; article 4 with four terminal setae.

Antenna ( Fig. 18e View FIGURE 18 ): article 1 short, semifused to cephalothorax; article 2 as long as wide, with one dorsal short spiniform seta; article 3 with one simple seta distally; article 4 longest, with two distal simple long, two distal short and one short simple setae at midlength; article 5 with one simple long seta distally; article 6 shortest, with three terminal simple setae.

Labrum ( Fig. 19d View FIGURE 19 ): hoodshaped, with row of setules on the apical margin.

Mandible ( Fig. 19c View FIGURE 19 ): Well calcified; pars molaris bent ventrally; lacinia mobilis spiniform.

Maxillula ( Fig. 19a View FIGURE 19 ): endite with four rows of ventral setules, and two short and seven simple terminal spiniform setae.

Maxilla ( Fig. 19f View FIGURE 19 ): rectangular, naked.

Labium ( Fig. 19e View FIGURE 19 ): of two lobes with one short simple seta at distal outer margin.

Maxilliped ( Fig. 19g View FIGURE 19 ): endites not fused, with no special feature.

Epignath ( Fig. 19b View FIGURE 19 ): with no special feature.

Cheliped ( Fig. 18h View FIGURE 18 ): basis as long as carpus; merus with ventral simple seta; carpus with one ventral and one dorsal simple setae, carpal shield well developed rounded; propodus smooth, with three teeth at cutting edge; dactylus smooth.

Pereopod 1 ( Fig. 18i View FIGURE 18 ): coxa naked; basis about three times as long as broad, with one setulose seta; ischium short, with one simple seta; merus as long as carpus, with one spiniform seta; carpus with two spiniform setae; propodus with a row of ventral spines and a spiniform distal seta; dactylus smooth; unguis as long as dactylus.

Pereopod 2 ( Fig. 18j View FIGURE 18 ): as pereopod 1, except basis without setae; carpus with three spiniform setae; propodus with a short simple seta.

Pereopod 3 ( Fig. 18k View FIGURE 18 ): as pereopod 2, except propodus smooth.

Pereopod 4 ( Fig. 18l View FIGURE 18 ): basis about three times as long as wide, naked; ischium short, with two simple setae; merus with two spiniform setae; carpus with three spiniform setae; propodus with three spiniform setae and a terminal spine; dactylus with no special features.

Pereopod 5 ( Fig. 18m View FIGURE 18 ): as pereopod 4, except basis with one simple seta; ischium with one simple setae.

Pereopod 6 ( Fig. 18n View FIGURE 18 ): as pereopod 4, except propodus with four spiniform setae.

Pleopods ( Fig. 18g View FIGURE 18 ): exopod with ten long simple setae; endopod with nine long simple setae.

Uropods ( Fig. 18f View FIGURE 18 ): exopod half the length of article one of endopod. Article 1 with one simple seta; article 2 with two terminal simple setae. Article 1 of endopod naked, article 2 with four terminal setae.

Juvenile males body length 2.1 mm. Antennule ( Fig 18c View FIGURE 18 ): first article longest, with one simple seta; article 2 naked; article 3 with one long distal seta; article 4 shortest, with two distal setae; article 5 with three terminal setae.

Manca body length 1.0 mm.

Distribution: Weddell Sea, Elephant Island, South Orkney Island, King George Island.

Remarks: among the representatives of Paraleptognathia of the southern oceans this species has the biggest carpal shield on the cheliped of the region.