Phallolampropoides chukchiensis Gerken 2018, n. sp.

• Main Author: Gerken, Sarah
• Format: Text
• Language: unknown
• Published: Zenodo 2018
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Cumacea; Lampropidae; Phallolampropoides; Phallolampropoides chukchiensis; Arctic; Arctic Ocean; Chukchi Sea; Cape Krusenstern; Seta; Chukchi
• Online Access: https://dx.doi.org/10.5281/zenodo.3799297; https://zenodo.org/record/3799297

Phallolampropoides chukchiensis n. sp. (Figs 50–53) Type material. Holotype: ovigerous female, USNM 1274566; paratype ovigerous female dissected, USNM 1264567; 70°16’30”N, 161°50’00”W, no depth, Chukchi Sea, SE of Icy Cape. Paratypes: adult male A, dissected, USNM 1274568; adult male B. dissected, USNM 1274569; 70°38’12”N, 160°02’30W, 0.3–0.5 m, SE of Wainwright. Other material. One subadult male, USNM 284872, 67°44’29”N, 163°33’45”W, 2–5.7 m, Chukchi Sea, NW of Cape Krusenstern; 1 female, USNM 284875, 66°35’N, 163°50’W, 0.3–0.5 m Chukchi Sea, NW of Kiwalik; 1 subadult male, USNM 284907, 70°48’20”N, 158°22’30”W, 0–1 m, Chukchi Sea, SE of Sinaru; 2 females, USNM 284908, 70°47’12”N, 158°40’00”W, 0–2 m, Chukchi, SE of Sinaru; 10 females, USNM 284909, 70°47’12”N, 158°40’00”W 0.5–2 m, Chukchi Sea, SE of Sinaru; 24 females, USNM 284919, 70°16’30”N, 161°50’00”W, Chukchi Sea, SE of Icy Cape; 1 female, USNM 284920, 70°17’03”N, 161°54’55”W, 0–1 m, Chukchi Sea, Icy Cape; 3 females, USNM 284921, 70°17’45”N, 161°59’30”W, 0–2 m, Chukchi Sea, Icy Cape; 1 adult male, 1 female (smashed), USNM 284917, 70°38’12”N, 160°02’30W, 0.3–0.5 m, Chukchi Sea, SE of Wainwright. Diagnosis . Carapace without lateral ridges. Telson 1.0 length of uropod peduncles, with 5 terminal setae, central seta longest. Adult male antennal flagellum extending to posterior border of pereonite 2, telson 1.3 length of uropod peduncles. Description. Holotype ovigerous female, USNM 1274566; paratype ovigerous female, USNM 1274567. Ovigerous female, 3.9 mm. Carapace unornamented; pseudorostral lobes 0.4 carapace length; eyelobe 0.1 carapace length, with 3 lenses; carapace equal to pereonites (Fig. 50 A–B). Antennule peduncle article 1 unarmed; article 2 0.8 article 1 length, with 3 simple setae; article 3 0.8 article 2 length, with 3 simple setae; main flagellum of 3 articles, with 7 simple setae and 2 aesthetascs; accessory flagellum of 3 articles, with simple setae (Fig. 50C). Antenna of 3 articles, article 1 and 2 with pappose seta, article 3 with 4 short simple setae terminally (Fig. 50D). Mandible navicular, with 7–9 microserrate setae medially, lacinia mobilis with 3 cusps (Fig. 50E). Maxillule with 2 endites; outer endite with 12 microserrate setae; inner endite with 3 simple and 1 pappose setae; palp with 2 setae (Fig. 50F). Maxilla with 3 endites; broad endite narrow, distal margin with pappose and simple setae; medial narrow endite with 4 microserrate setae terminally; distal narrow endite with 5 microserrate setae terminally; both narrow endites extending to distal margin of broad endite (Fig. 50G). Maxilliped 1 basis produced medially as broad lobe, medial margin with 4 pappose setae, lateral margin with 5 pappose setae, 2 hook setae distally, distal margin with simple setae; ischium absent; merus unarmed; carpus 2.3 merus length, with 5 simple and 5 comb setae medially, plumose seta laterally, lateral margin with 3 teeth; propodus 0.6 carpus length, with 9 simple setae medially, 2 plumose setae laterally; dactylus 0.9 propodus length, with 2 simple setae terminally (Fig. 50H). Maxilliped 2 basis equal to all other articles together, with 1 simple and 3 plumose setae distally; ischium 0.08 basis length, unarmed; merus 3.3ischium length, with pappose seta medially, plumose seta laterally; carpus 1.2 merus length, with 2 simple and 5 plumose setae medially; propodus 0.8 carpus length, with 5 plumose setae medially, plumose seta laterally; dactylus 0.4 propodus length, with 4 simple setae terminally (Fig. 50I). Maxilliped 3 basis 1.5 all other articles together, with 7 pappose setae medially, 3 plumose setae at distal corner; ischium 0.04 basis length, unarmed; merus 5.0 ischium length, with plumose seta medially, plumose seta laterally; carpus 1.2 merus length, with 4 simple and 3 plumose setae medially; propodus 0.6 carpus length, with 4 plumose setae medially, 1 simple and 1 plumose setae laterally; dactylus 0.6 propodus length, with 5 simple setae terminally; exopod equal to basis length, basal article with pappose seta, flagellum with plumo-annulate setae (Fig. 51A). Pereopod 1 basis 1.2 all other articles together, with 17 pappose and 2 pappose–microserrate setae; ischium 0.04 basis length, unarmed; merus 5.0 ischium length, with simple seta medially, pappose seta laterally; carpus 1.7 merus length, with 2 pappose setae medially, 3 simple and 1 pappose setae laterally; propodus 0.6 carpus length, with 3 simple setae; dactylus 0.7 propodus length, with 4 simple setae terminally; exopod equal to basis length, basal article with 4 pappose setae, flagellum with plumo-annulate setae (Fig. 51B). Pereopod 2 basis 0.9 all other articles together, with 19 pappose setae; ischium 0.04 basis length, unarmed; merus 6.0 ischium length, with 2 pappose setae; carpus 1.5 merus length, with 2 simple, 2 pappose, 1 microserrate and 1 pappose–microserrate setae; propodus 0.5 carpus length, with simple seta; dactylus 1.3 propodus length, with 8 simple setae terminally; exopod 1.2 basis length, basal article with 4 pappose setae, flagellum with plumoannulate setae (Fig. 51C). Pereopod 3 basis 1.6 all other articles together, with 9 pappose and 1 plumose setae; ischium 0.09 basis length, with 2 annulate setae; merus 2.3 ischium length, with 2 simple and 1 pappose setae; carpus 0.8 merus length, with 1 plumose and 1 annulate setae; propodus 0.7 carpus length, unarmed; dactylus 0.6 propodus length, with 3 simple setae terminally; exopod rudimentary, 0.4 basis length, of 2 articles with 5 pappose setae (Fig. 51D). Pereopod 4 basis 1.1 all other articles together, with 5 pappose setae; ischium 0.1 basis length, with 1 pappose and 3 annulate setae; merus 2.3 ischium length, with 3 annulate setae; carpus equal to merus length, with 1 pappose and 5 annulate setae; propodus 0.8 carpus length, with annulate seta; dactylus 0.4 propodus length, with 3 simple setae terminally; exopod rudimentary, 0.4 basis length, of 2 articles with 1 simple and 3 pappose setae (Fig. 51E). Pereopod 5 0.8 basis all other articles together, with 4 pappose and 1 complex pedunculate setae; ischium 0.1 basis length, with 4 annulate setae; merus 2.7 ischium length, with 1 simple and 3 annulate setae; carpus 1.1 merus length, with 1 simple, 1 plumose and 6 annulate setae; propodus 0.7 carpus length, with annulate seta; dactylus 0.5 propodus length, with 2 simple setae terminally (Fig. 51F). Telson 1.6 length of pleonite 6, without lateral setae, 5 microserrate terminal setae, central seta longest (Fig. 51G). Uropod peduncles 2.0 pleonite 6 length, 1.2 telson length, with microserrate seta medially. Uropod endopod of 3 articles, 1.1 peduncle length; article 1 1.3 articles 2 and 3 together, with 5–6 microserrate setae medially; article 2 0.4 article 1 length, with 3 microserrate setae medially; article 3 0.9 article 2 length, medial margin serrate, with microserrate seta medially, terminal seta with single subterminal setule, subequal to article 3 length. Uropod exopod 0.9 length of endopod; article 1 1.5 article 2 length, with 4 plumose setae medially, complex seta distally; article 2 0.8 article 1 length, with 3 plumose setae medially, complex seta laterally, terminal seta complex, 0.7 article 2 length (Fig. 51G). Paratype adult male, USNM 1274568; paratype adult male, USNM 1274569. Paratype adult male, 2.7 mm. Carapace unornamented; pseudorostral lobes 0.45 carapace length; eyelobe 0.1 carapace length, with 5 lenses; carapace about as long as pereonites; pair of penial lobes ventrally on pereonite 5 (Fig. 52 A–B). Antennule peduncle article 1 equal to article 2, with 2 simple setae; article 2 equal to article 1 length, with 5 simple and 1 complex pedunculate setae; article 3 0.7 article 2 length with 3 simple setae; main flagellum of 3 articles, 1.7 article 3 length, with 3 simple setae and 3 aesthetascs; accessory flagellum of 2 articles, 0.9 main flagellum article 1 length, with 5 simple setae. Antennule large, 0.8 length of carapace (Fig. 52 B–C). Antenna extending past anterior border of pereonite 3; peduncle of articles 4 articles; article 1 unarmed; article 2 with pappose seta; article 3 unarmed; article 4 with ranks of setae, incompletely circling article; flagellum with 14 short articles, each with 2–3 setae, articulation at article 8, article 8 produced as lobe medially. Antenna 1.4 length of antennule, not including setae (Fig. 52B, D). Maxilliped 3 basis 1.6 all other articles together, with 2 pappose and 6 plumose setae; ischium 0.03 basis length, unarmed; merus 5.0 ischium length, with plumose seta medially, plumose seta laterally; carpus 1.3 merus length, with 4 plumose setae medially, plumose seta laterally; propodus 0.9 carpus length, with 2 pappose setae medially, 2 pappose setae laterally; dactylus 0.6 propodus, with 4 setae terminally; exopod 0.9 basis length, basal article with 3 pappose setae, flagellum with plumo-annulate setae (Fig. 52E). Pereopod 1 basis equal to all other articles together, with 9 pappose setae; ischium 0.07 basis length, unarmed; merus 2.3 ischium length, with 4 pappose setae; carpus 1.9 merus length, with 2 pappose setae; propodus 1.3 carpus length, with 3 simple setae; dactylus 0.8 propodus length, with 6 simple setae terminally; exopod equal to basis length, basal article with 4 pappose setae, flagellum with plumo-annulate setae (Fig. 53A). Pereopod 2 basis 0.7 all other articles together, with 1 simple and 4 pappose setae; ischium 0.6 basis length, unarmed; merus 3.5 ischium length, with 2 pappose and 1 micorserrate setae; carpus 2.6 merus length, with 1 simple, 4 pappose and 4 microserrate setae; propodus 0.6 carpus length, with 2 setae with single subteminal setule; dactylus 1.4 propodus length, with 5 setae with single subterminal setule and annulate seta terminally; exopod 1.1 basis length, basal article with 4 pappose setae, flagellum with plumo-annulate setae (Fig. 53B). Pereopod 3 basis 1.5 all other articles together, with 4 pappose setae; ischium 0.08 basis length, with 1 simple and 1 annulate setae; merus 2.3 ischium length, with 3 annulate setae; carpus equal to merus length, with 1 simple and 3 annulate setae; propodus 0.6 carpus length, with annulate seta; dactylus 0.8 propodus length, with 3 simple setae terminally; exopod equal to basis length, basal article with 3 pappose setae, flagellum with plumo-annulate setae (Fig. 53C). Pereopod 4 basis 0.9 all other articles together, with 1 simple and 2 pappose setae; ischium 0.2 basis length, with 3 annulate setae; merus 2.2 ischium length, with 4 annulate setae; carpus 0.8 merus length, with 1 simple and 3 annulate setae; propodus 0.5 carpus length, with annulate seta; dactylus 0.6 propodus length, with 2 simple setae terminally; exopod 1.2 basis length, basal article with 2 pappose setae, flagellum with plumo-annulate setae (Fig. 53D). Pereopod 5 basis 0.6 all other articles together, with 1 simple and 3 pappose setae; ischium 0.3 basis length, with 2 annulate setae; merus 1.6 ischium length, unarmed; carpus equal to merus length, with 2 simple and 2 annulate setae; propodus 0.5 carpus length, with annulate seta; dactylus 0.5 propodus length, with 2 simple setae terminally (Fig. 53E). Penial lobes 0.7 basis of pereopod 5, tubular (Fig. 53E). Telson 2.5 length of pleonite 6, with 1 pair microserrate lateral setae, 5 long microserrate terminal setae, central seta shortest, outer pair of setae longest, 0.5 telson length (Fig. 53F). Uropod peduncles 2.3 pleonite 6 length, 0.9 telson length, with 1–3 microserrate setae medially. Uropod endopod of 3 articles, 1.1 peduncle length; article 1 1.4 articles 2 and 3 together, with 5–7 microserrate setae medially, microserrate seta laterally; article 2 0.3 article 1 length, with microserrate seta medially, microserrate seta laterally; article 3 1.1 article 2 length, with microserrate seta medially, microserrate seta laterally, terminal microserrate seta 1.5 length of article 3. Uropod exopod 0.8 length of endopod; article 1 0.8 length of article 2, with microserrate seta laterally; article 2 1.3 article 1 length, with 2 microserrate setae medially, 2–3 microserrate setae laterally, terminal microserrate seta equal to article 2 length (Fig. 53F). Distribution . Chukchi Sea. Etymology . The species is named chukchiensis after the locality of collection, the Chukchi Sea. Depth . 0–5.7 m. Distribution. Chukchi Sea, Arctic Ocean, 66– 70°N, 158– 164°W. Remarks . This genus appears very much like Lamprops and Alamprops , and without the adult male it may be very difficult to place the females into the correct genus. In females of Phallolampropoides chukchiensis the telson is barely shorter than the uropod peduncles, while in Phallolamprops californiensis females the telson is distinctly shorter (about 0.7) than the uropod peduncles. In females of P. chukchiensis the uropod exopod extends to the midpoint of article 3 of the uropod endopod, while in Phallolamprops pribilofensis the uropod exopod extends only to the distal border of article 2 of the uropod endopod. : Published as part of Gerken, Sarah, 2018, The Lampropidae (Crustacea: Cumacea) of the World, pp. 1-192 in Zootaxa 4428 (1) on pages 128-134, DOI: 10.11646/zootaxa.4428.1.1, http://zenodo.org/record/3769771