Portaratrum afer, Guerrero-Kommritz, Jürgen, 2003

Guerrero-Kommritz, Jürgen, 2003, Portaratrum, a new genus of deepsea Tanaidacea (Crustacea) with description of two new species, Zootaxa 282, pp. 1-14 : 5-8

publication ID	https://doi.org/ 10.5281/zenodo.156812
DOI	https://doi.org/10.5281/zenodo.6276687
persistent identifier	https://treatment.plazi.org/id/0396972A-FFFC-FF8F-FE9F-C612C7768AB8
treatment provided by	Plazi
scientific name	Portaratrum afer
status	sp. nov.

Treatment

Portaratrum afer View in CoL n. sp. ( Figs 1 View FIGURE 1 , 2 View FIGURE 2 )

Material examined: Holotype ZMH K 40353, nonovigerous female, 2.2 mm, Meteor M48, DIVA station 350, 16°14.3–14.9´S, 005°26.8–26.7´E, 5389 m, 29.07.2000, EBS.

Paratypes: ZMH K 40354, neuter, (2) 3.1 mm and 3.3 mm, Meteor M48, DIVA station 348, 16°18.1–19.3´S, 005° 27.2´E, 5387 m, 28.07.2000, EBS. ZMH K 40355, neuter (1) 2.6 mm, and (1) dissected nonovigerous female, Meteor M48, DIVA station 350, 16°14.3–14.9´S, 005°26.8–26.7´E, 5389 m, 29.07.2000, EBS. ZMH K 40356, neuter (1) 2.7 mm, Meteor M48, DIVA station 340, 18°18.3–19.4´S, 004°41.3– 41.9 E, 5395 m, 22.07.2000, EBS.

Diagnosis: Cheliped slender, exopod of uropod about a third of endopod first article. Propodus of pereopods 1–3 with a ventral row of spinules.

Description: Nonovigerous female. Body ( Fig. 1 View FIGURE 1 a, b): long and slender, nine times as long as wide.

Cephalothorax ( Fig.1 View FIGURE 1 a, b, c): oval, 1.2 times longer than wide, without ocular process. Pereon ( Fig. 1 View FIGURE 1 a, b): pereonite 6 shortest, pereonite 1 longer than pereonite 6 and shorter than 2, pereonites 3, 4, 5 subequal in length, pereonite 2 longer than 1 and shorter than 3. Pleon ( Fig. 1 View FIGURE 1 a, b): pleonites of equal length, pleonite 5 with a prominent ventral spiniform process, pleotelson pentameral, longer than two pleonites together. Apex rounded.

Antennula ( Fig. 1 View FIGURE 1 d): composed of four articles. First article longest with two terminal simple setae. Second article with two terminal simple setae. Third article as long as wide, with two simple terminal setae. Fourth article with five long terminal and one simple subterminal setae.

Antenna ( Fig. 1 View FIGURE 1 e): composed of six articles. First article short and almost fused to the cephalothorax. Second article with comb seta and short simple distal seta. Third article with short distal seta. Fourth article longest, with one long and one short distal simple seta. Fifth article as long as first article, with one distal seta. Sixth article shortest, with two long and two short terminal setae.

Labrum ( Fig. 1 View FIGURE 1 i): hoodshaped, with two rows of setules distally, with long setules on the lateral margins.

Mandible ( Fig. 1 View FIGURE 1 j): well developed, pars molaris not pointed, turned downwards. Maxillule ( Fig. 1 View FIGURE 1 k): endite with two short, one long serrated, and six long simple spines, one row of setules dorsally.

Maxilla ( Fig. 1 View FIGURE 1 m): of irregular shape, naked.

Labium ( Fig. 1 View FIGURE 1 l): composed of two triangular lobes with a row of setules on apex.

Maxilliped ( Fig. 1 View FIGURE 1 o): basis oval, endites fused basally, palp composed of four articles. First article naked, second article with three long stout serrated inner setae. Second article with three stout simple inner and one outer setae. Fourth article with four long simple and one short simple terminal setae.

Epignath ( Fig. 1 View FIGURE 1 n): falciform and without setae.

Cheliped ( Fig. 1 View FIGURE 1 f): basis attached ventrally to cephalothorax, naked. Merus triangular, with 1 ventral seta. Carpus longer than wide, no carpal shield, with 2 short setae ventrally near chela insertion, one tubercle distally at the chela insertion. Propodus 3 times as long as wide, fixed finger comprising 50 % of propodus length, one long and one short simple seta ventrally, three dorsal setae near cutting edge, four blunt teeth dorsally. Dactylus curved, as long as fixed finger, naked.

Pereopod 1 ( Fig. 2 View FIGURE 2 a): Without coxa. Basis long, 5 times longer than wide, naked. Ischium short, with 1 simple seta. Merus twice as long as wide, with 1 long stout simple distal seta. Carpus longer than merus, with 2 long stout simple distal setae. Propodus longer than carpus, with one terminal spine and one row of spinules ventrally, one simple stout seta below dactylus. Dactylus smooth. Unguis sharp, half as long as dactylus.

Pereopod 2 ( Fig. 2 View FIGURE 2 b): as pereopod 1 except carpus with three long stout simple distal setae.

Pereopod 3 ( Fig. 2 View FIGURE 2 c): as pereopod 2.

Pereopod 4 ( Fig. 2 View FIGURE 2 d): basis long 4 times longer than wide, naked. Ischium short, with one simple seta. Carpus with two stout distal setae. Carpus longer than merus, with two long and one short stout simple distal setae. Propodus longer than carpus, with three long stout simple terminal setae. Dactylus with ventral groove bordered by fine spinules. Unguis sharp and pointed, half as long as dactylus.

Pereopod 5 ( Fig. 2 View FIGURE 2 e): as pereopod 4 except basis with a simple dorsal seta, carpus with three long and one short stout distal setae. Propodus with one dorsal simple seta. Pereopod 6 ( Fig. 2 View FIGURE 2 g): as pereopod 4 except merus with one long and one short stout distal seta. Carpus with two long and two short stout distal simple setae. Propodus with four stout simple terminal setae. Dactylus shaped like flat sigmoidal curve.

Pleopods ( Fig. 1 View FIGURE 1 h): biramous, basal article pentameral. Endopodite and exopodite of similar shape, with ten terminal long simple setae.

Uropods ( Fig. 1 View FIGURE 1 g): biramous. Basal article rectangular. Exopod uniarticled, with two short setae and one as long as endopod. Endopod composed of two articles, first article longest with two simple terminal setae. Second article with four long terminal setae and two short subterminal setae.

Neuter: Similar to female except pleopods are not well developed.

Ovigerous female: Not known

Male: Not known

Type locality: M48, DIVA., station 350, 16°14.3–14.9´S, 005°26.8–26.7´E, 5389 m, Angola Basin, Atlantic Ocean.

Etymology: The name afer is a Latin word for Africa.

Distribution: This species is only known from the Angola Basin.