Notopoma lowryi, Souza-Filho & Serejo, 2014

Souza-Filho, Jesser F. & Serejo, Cristiana S., 2014, On the phylogeny of Ischyroceridae (Amphipoda, Senticaudata, Corophiida), with the description of a new genus and eight new species from deep-sea Brazilian waters, Zoological Journal of the Linnean Society 170 (1), pp. 34-85 : 68-71

publication ID	https://doi.org/ 10.1111/zoj.12099
persistent identifier	https://treatment.plazi.org/id/F84F7650-9A1D-B113-FCC0-FD356338F8F4
treatment provided by	Marcus
scientific name	Notopoma lowryi
status	sp. nov.

Treatment

NOTOPOMA LOWRYI View in CoL SP. NOV. ( FIGS 22–24 View Figure 22 View Figure 23 View Figure 24 )

Notopoma sp. Souza-Filho & Serejo, 2010b: 182.

Type material

Holotype: Male (3 mm), OCEANPROF I, #59, Campos Basin, Rio de Janeiro, Brazil, 21°53′59.22″S, 39°55′30.66″ W, 12 December 2002, 750 m, MNRJ 21244 View Materials . GoogleMaps

Etymology

Named in honour of Dr James K. Lowry, in recognition of his contributions to Amphipoda systematics.

Type locality

Campos Basin, Rio de Janeiro, Brazil.

Diagnosis

Head eyes absent; rostrum extended slightly beyond lateral lobes. Antenna 1 stout, setose, longer than pereonites 1–6 together; article 2 slightly shorter than article 3; flagellum with three articles; flagellum article 1 with dense aesthetascs; accessory flagellum rudimentary, 1-articulate. Gnathopod 1 propodus palm acute and serrate, with short and long pappose setae; dactylus extended beyond end of palm. Gnathopod 2 carpochelate; basis anterior margin convex and crenulate; carpus enlarged, with one large posterodistal bidentate process, little produced anteriorly, with distal U-shaped excavation; propodus 2.2 times as long as wide, posterior margin excavate; dactylus as long as propodus and with one marginal tooth. Pleopod 3 uniramous very reduced, as long as inner ramus of pleopod 2. Telson broader than long; cleft almost one-half of its length.

Description

Based on holotype male (3 mm), MNRJ 21244. Head anteroventral margin strongly recessed; eyes absent; rostrum extended slightly beyond lateral lobes. Antenna 1 stout, setose, longer than pereonites 1–6 together; article 2 slightly shorter than article 3; flagellum with three articles; flagellum article 1 with dense aesthetascs; accessory flagellum rudimentary, 1-articulate. Antenna 2 peduncle article 4 setose, 1.2 times as long as article 5; flagellum with three articles. Mandible molar triturative; right mandible, incisor with four teeth; lacinia mobilis minutely serrate, accessory setal row with three pappose robust setae; palp article 3 shorter than article 2, spatulate, with long setae medially and distally. Maxilla 1 inner plate short and with a distal single seta; outer plate with six robust setae; palp with four distal robust setae and one facial pappose seta. Maxilla 2 outer plate slightly longer than inner plate; with a row of pappose medial and distal setae. Lower lip inner lobes present; mandibular process well developed. Maxilliped inner plate subquadrate, with three short and robust setae on distal margin and one subdistal short and robust seta; outer plate ovate, with three medial to distal robust setae and one distal robust pappose seta; palp articles 1–3 with long pappose setae along inner margin; palp article 2 2.5 × length of article 1; palp article 4 with one very long distal robust seta.

Coxae 1–7 wider than long. Gnathopod 1 subchelate, carpus lobate and shorter than propodus; palm acute and serrate, with short and long pappose setae; dactylus extended beyond end of palm. Gnathopod 2 carpochelate; basis 1.3 times longer than broad; anterior margin convex and crenulate; carpus enlarged, with one large ventrodistal bidentate process weakly produced anteriorly, with distal U-shaped excavation; propodus 2.2 times as long as wide, posterior margin excavate; dactylus as long as propodus, and with one marginal tooth. Pereopod 3 basis subovate; merus anterodistal angle produced and shorter than propodus; dactylus acute and shorter than propodus. Pereopod 4 similar to pereopod 3, but merus as long as propodus. Pereopod 5 basis ovate; merus with anterior and posterior margin produced; propodus triangular and short; carpus longer than merus; dactylus with three accessory spines. Pereopod 6 thin, basis slender and subrectangular; merus and carpus with anterior and posterior margin produced; dactylus with two accessory spines. Pereopod 7 similar to pereopod 6, except for basis broad with posterior margin rounded.

Pleonites with lateral ridges. Pleopod 1 large and biramous. Pleopod 2 biramous, inner ramus 1-articulate, half the length of article 1 of outer ramus. Pleopod 3 uniramous, much reduced, as long as inner ramus of pleopod 2. Uropod 1 peduncle 1.1 times longer than outer ramus; rami denticulate distally, with one pappose seta; inner ramus shorter than outer ramus, with one distal robust and pappose seta; outer margin of outer ramus denticulate, with a row of short robust setae. Uropod 2 uniramous; outer margin of ramus denticulate, with one long seta distally and one seta subdistally. Uropod 3 uniramous, short, almost as long as length of ramus of uropod 2; peduncle broad, with one seta distally; ramus very reduced, with two short upturned spines. Telson broader than long; cleft almost one-half of its length.

Tube

Unknown.

Remarks

Notopoma lowryi sp. nov. is similar to N. cidaridis , from Elephant Island, Antarctica, in having antenna 1 with the accessory flagellum rudimentary and 1-articulate, eyes absent, and pleopod 3 uniramous; however, N. lowryi sp. nov. differs from N. cidaridis by the flagellum of antennae 1 and 2 with three articles instead of four articles, the rostrum slightly longer than the lateral cephalic lobes (versus much longer), gnathopod 2 with the posterior margin of the propodus smooth (versus crenulate) and the carpus with the posterodistal process weakly produced anteriorly (versus strongly produced anteriorly), and the basis of pereopods 6 and 7 more slender and subrectangular.