Paraleptognathia longiremis Guerrero-Kommritz 2004, new combination

• Main Author: Guerrero-Kommritz, Jürgen
• Format: Text
• Language: unknown
• Published: Zenodo 2004
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Tanaidacea; Akanthophoreidae; Paraleptognathia; Paraleptognathia longiremis; Canada; Greenland; Seta; East Greenland; Alaska
• Online Access: https://dx.doi.org/10.5281/zenodo.5247919; https://zenodo.org/record/5247919

Paraleptognathia longiremis (Lilljeborg, 1864) new combination (Figs 13, 14, 15) Synonymy: Akanthophoreus longiremis Sieg, 1986 Leptognathia longiremis (Lilljeborg, 1864) Tanais longiremis Lilljeborg, 1864 Material examined: 21 individuals. ZMH K­40542 RV ”Polarstern” St. 31­6, 21 females. Diagnosis: Propodus of pereopod 1 with a row of ventral spines. Description: non­ovigerous female. Body (Fig. 13a, b): long, about eight times as long as broad. Body length 2.5 to 3.7 mm. Cephalothorax (Fig. 13a, b): about 1.4 times longer than broad. Pereon (Fig. 13a, b): pereonite 6 shortest, pereonite 1 longer than 6, shorter than 5, pereonite 5 as long as 4, pereonite 2 and 3 equal in length. Pleon (Fig. 13a, b): pleonites subequal; pleotelson rounded. Antennule (Fig. 14a): article 1 longest with one long simple distal seta; article 2 with one distal simple seta; article 3 shortest, naked; article 4 with five terminal setae. Antenna (Fig. 14b): article 1 short semifused to cephalothorax; article 2 as long as broad, with one short spiniform seta; article 3 with one dorsal simple seta, article 4 with two terminal long simple and one short simple setae, article 5 with one terminal simple seta; article 6 shortest, with four terminal simple setae. Labrum (Fig. 15a): hood­shaped, with a row of setules on the distal margin. Mandible (Fig. 15c): well calcified, pars molaris bent ventrally, lacinia mobilis spiniform. Maxillula (Fig. 15a): endite with four rows of ventral setules, and one short, one pinnate and six simple terminal spiniform setae. Maxilla (Fig. 15f): rectangular, smooth. Labium (Fig. 15e): composed of two triangular lobes, with two distal simple setae on each lobe. Maxilliped (Fig. 15g): endites not fused; no setae were observed on the basis. Epignath (Fig. 15b): smooth, with no special features. Cheliped (Fig. 14a): basis naked; merus with one ventral seta; carpus with two ventral and two dorsal simple setae and one tubercle near insertion of chela, carpal shield welldeveloped, rounded; propodus with three teeth at cutting edge; dactylus smooth. Pereopod 1 (Fig. 14f): coxa naked; basis about 3.5 times longer than broad, naked; ischium short, with short simple seta; merus with one spiniform seta; carpus longer than merus, with two spiniform setae; propodus with a ventral row of short spines, one terminal spine and one spiniform distal seta; dactylus smooth; unguis sharp. Pereopod 2 (Fig. 14g): as pereopod 1, except carpus with three spiniform setae and propodus smooth. Pereopod 3 (Fig. 14h): as pereopod 1, except basis with setulose seta and propodus with a ventral and a dorsal row of spinules. Pereopod 4 (Fig. 14i): basis about 3.5 times longer than broad, naked; ischium short, with a short simple seta; merus with two spiniform setae; carpus with three spiniform setae; propodus smooth, with four terminal spiniform setae and one terminal spine; dactylus as long as propodus; unguis sharp. Pereopod 5 (Fig. 14j): as pereopod 4, except propodus with three terminal spiniform setae. Pereopod 6 (Fig. 14k): as pereopod 4, except basis with two simple setae; carpus with four spiniform setae. Pleopods (Fig. 14e): exopod with four simple long setae; endopod with five simple long setae. Uropods (Fig. 14d): exopod less than half the length of endopod article 1. Exopod article 1 with one distal simple seta; article 2 with three terminal setae. Endopod article 1 naked; article 2 with four terminal setae. Distribution: this species occurs in south and east Greenland. Remarks: Paraleptognathia longiremis is very similar to P. gracilis and primary it was synonymized by Lang (1957) with this species. Paraleptognathia longiremis has a clear row of spinules on propodus of the pereopod 1. The chelipeds are different, the chela has no crenulation in P. longiremis , and propodus of P 1 has a row of spinules that is missing in P. gracilis . The observation of Hansen (1913) of a very long uropod is not present in all individuals. Most of the individuals found had a typical short Paraleptognathia uropod. : Published as part of Guerrero-Kommritz, Jürgen, 2004, A revision of the genus Paraleptognathia Kudinova-Pasternak, 1981 (Crustacea: Tanaidacea) and description of four new species, pp. 1-63 in Zootaxa 481 (1) on pages 33-38, DOI: 10.11646/zootaxa.481.1.1, http://zenodo.org/record/5030070 : {"references": ["Lang, K. (1957) Tanaidacea from Canada and Alaska. Contributions du Department des Pecheries, Quebec, 52, 1 - 54.", "Hansen, H. J. (1913) Crustacea Malacostraca. II. The Order Tanaidacea. The Danish Ingolf Expedition, 3 (3), 1 - 145."]}