Alamprops krasheninnikovi Gerken 2018, n. comb.

Alamprops krasheninnikovi (Derzhavin. 1926) n. comb.

Lamprops krasheninnikovi Derzhavin, 1926: 179, pl. 3 fig. 6, pl. 6.

Lamprops quadriplicata krasheninnikovi.— Lomakina 1955: 137; 1958: 84–85.—Lie 1968: 297, 553.

Type material. Deposition unknown. Petropavlovsk Bay, Kamschatka Peninsula. Not seen.

Diagnosis. Carapace with 4 lateral ridges; eyelobe with lenses, not extending to anterior border of pseudorostrum. Telson with 2 pairs of lateral setae, 5 terminal setae, central seta longest, outermost pair longer than inner pair. Uropod peduncle with 9 medial setae; uropod exopod article 1 1.0 length of article 2. Male with antennal flagellum long.

Depth. 25–30 m.

Distribution. Petropavlovsk Bay, Kamschatka Peninsula; Okhotsk Sea; Bering Sea.

Remarks. This species was originally described by Derzhavin (1926) from Kamchatka, and placed as a subspecies of A. quadriplicatus by Lomakina (1955). The current understanding of A. quadriplicatus is that the species is restricted to the northwestern Atlantic, on the American and Canadian Atlantic coasts. Thus, A. krasheninnikovi is returned to the original status of a separate species. A record of Lamprops krasheninnikovi by Zimmer (1943) from Vancouver is likely either a new species or a representative of A. augustinensis (Gerken, 2005), but the specimen was not seen. Likewise, a specimen identified by Zimmer as krashenninikovi from Corona del Mar, California (USNM 92076) is not krashenninikovi. Alamprops krasheninnikovi can be distinguished from A. longispina by the outermost pair of terminal setae on the telson being equal to the central seta; in A. longispina the outer most pair is twice as long or more than the central seta. Alamprops krasheninnikovi can be distinguished from A. quadriplicatus by the proportions of pereopods 1 and 2. In A. krasheninnikovi the dactylus of pereopod 1 is 0.8 the length of the propodus, and the dactylus of pereopod 2 is 0.6 the length of the propodus; in A. quadriplicatus the dactylus of pereopod 1 is 0.9 the length of the propodus, and the dactylus of pereopod 2 is equal to the propodus. Alamprops krasheninnikovi can be distinguished from A. augustinensis by the antennal peduncle, in A. augustinensis the first peduncle article is longer than the second, while in A. krasheninnikovi the first peduncle article is equal to the second article.