Spectrarcturus intermedius Stransky & Svavarsson & Poore & Kihara 2020, comb. nov.

• Main Authors: Stransky, Bente, Svavarsson, Jörundur, Poore, Gary C. B., Kihara, Terue Cristina
• Format: Text
• Language: unknown
• Published: Zenodo 2020
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Isopoda; Arcturidae; Spectrarcturus; Spectrarcturus intermedius; Pacific; Kiska; Jörundur; Kiska Harbor; Commander Island; Aleutian Islands
• Online Access: https://dx.doi.org/10.5281/zenodo.4332834; https://zenodo.org/record/4332834

Spectrarcturus intermedius (Richardson, 1899a) comb. nov. (Fig. 31) Arcturus intermedius Richardson, 1899a: 854–855.— Richardson, 1899b: 275–277. Pleuroprion intermedium. — Richardson, 1905: 344–346, fig. 373.— Gurjanova, 1936: 201, fig. 129.— Schultz, 1969: 52, fig. 53b.— Kussakin, 1982: 428–430, fig. 318. Material examined: Syntype , USMN 22581, Kyska Harbor, Aleutian Islands, 10 ftms, 1 female. Diagnosis: Body with numerous large, narrow, pointed spines; mid-dorsal spine anteriorly on head, mid-dorsally pair of spines on head, row of spines across pereonite 1; row of spines across pereonites 2 and 3; pereonite 4 0.2 times body length; trapezoid, about as long as second and third together; anterior and posterior rows of spines across pereonite 4, pair of spines middorsally. Pleotelson short, with several long and short spines on anterior part, one lateral spine on posterior part, posteriorly bifid apex, fork-like. Antennula short, not reaching distal end of second peduncular segment of antenna. Antenna long and slender, about 0.9 of total body length. Spines absent from basis of pereopods 5 to 7. Oostegites not present on pereopod 5. Remarks: The ventral lateral plate of the head has a deep incision at the anterior end of pereonite 1. The posterior end of the pleotelson ends in deep upraised fork, which distinguishes this species from all Spectrarcturus species, except S. hystrix and S. murdochi . The middorsal spine on anterior part of the head can be used to distinguish this species from several other Spectrarcturus species. Kussakin (1982) noted that the specimen occurring at the Commander Island differed from the holotype in the presence of a spine on article 3 and by having different shape of the body spines, but still considered that these specimens belonged to S. intermedium . Distribution: Western part of the Aleutian Islands, Kiska-Harbor Bay, Commander Island, at depths between 18–40 m (Kussakin 1982). : Published as part of Stransky, Bente, Svavarsson, Jörundur, Poore, Gary C. B. & Kihara, Terue Cristina, 2020, Revision of Pleuroprion zur Strassen, 1903 (Holidoteidae) and re-evaluation of Spectrarcturus Schultz, 1981 (Arcturidae) (Crustacea, Isopoda, Valvifera), pp. 1-52 in Zootaxa 4894 (1) on page 42, DOI: 10.11646/zootaxa.4894.1.1, http://zenodo.org/record/4315364 : {"references": ["Richardson, H. (1899 a) Key to the isopods of the Pacific coast of North America, with descriptions of twenty-two new species. Proceedings of the United States National Museum, 21 (1175), 815 - 869. https: // doi. org / 10.5479 / si. 00963801.21 - 1175.815", "Richardson, H. (1899 b) Key to the isopods of the Pacific coast of North America, with descriptions of twenty-two new species. Annals and Magazine of Natural History, Series 7, 4 (21 - 23), 157 - 187, 260 - 277 & 321 - 338 (reprinted, same title as in 1899 a). https: // doi. org / 10.1080 / 00222939908678208", "Richardson, H. (1905) A monograph on the isopods of North America. Bulletin of the United States National Museum, 54, I-Liii + 1 - 727. https: // doi. org / 10.5479 / si. 03629236.54. i", "Gurjanova, E. F. (1936) Isopodes des Mers Orienalis. Fauna de L'URSS, Crustacees, 7 (3), i-XII + 1 - 279. [in Russian, Summary in German]", "Schultz, G. A. (1969) How to know the marine isopod crustaceans. W. M. C. Brown Company Publishers, Dubuque, Iowa, 359 pp.", "Kussakin, O. G. (1982) Morskye I solonovatovodnye ravnonogie rakoobrasnye (Isopoda) cholodnix I umerennix vod severnogo polushariya [Marine and brackish water like-footed crustaceans (Isopoda) of cold and temperate waters of the North- ern Hemisphere]. Podotryadi Anthuridea, Microcerberidea, Valvifera, Tyloidea. Opredeliteli po Faune SSSR, Izdavaemye Zoologicheskim Institutom Akademii Nauk SSSR, 131 (2), 1 - 463. [in Russian]"]}