Atlantapseudes undetermined

Atlantapseudes sp. (Fig. 4) Atlantapseudes nigrichela Băcescu, 1978, 317–322 (in part), fig. 1A. Atlantapseudes nigrichela: Meyer & Heard 1989, table 1; Bamber 2007, 51, 52, 66; Santos & Hansknecht 2007, 29, 38, table 2; Błażewicz-Paszkowycz et al. 2011, 10–16, figs 6–9; Esquete & Cunha 2017, 64, 65, 72, table S1; García-Herrero et al. 2021b, suppl. 2, 3. Material examined. One male (394/30687, Muzeul Național de Istorie Naturală “Grigore Antipa,” TBL = 5.50 mm), Stn 396, Atlantic Ocean, western Portugal (41°17'4"N, 09°15'7"W), 900 m depth, silty or sandy-silty bottom, cruise “Thalassa,” September 1972; one ovigerous female (49217-4, Muzeul Național de Istorie Naturală “Grigore Antipa,” TBL = 7.60 mm), Stn 407, Atlantic Ocean, western Portugal (40°33'5"N, 09°24'0"W), 740 m depth, silty or sandy-silty bottom, cruise “Thalassa,” 1 September 1972. Supplemental description of ovigerous female and male. Monodentate rostrum (Fig. 4A); spine present on mid-lateral margin of cephalothorax (Fig. 4A); each eye lobe with anterior spine (Fig. 4A); pereonites 1 and 2 without lateral spines (Fig. 4B–E); pereonites 3–6 with anterior spine on lateral margin (Fig. 4F, G); squama about 3.4 times (female) or 3.2 times (male) longer than antennal article-3 (Fig. 4H); pereopod-1 coxa with anterior spine; pereopod-1 propodus with six (female) or five (male) ventral and two dorsal spines; pereopod-1 dactylus with five small ventral spines; pereopod-2 coxa with spine; uropodal endopod with 23 articles; uropodal exopod with five articles (not observed in male); five paired pleopods lacking (female) or present (male) ventrally. Remarks. Atlantapseudes sp. corresponds to the monodentate individuals of “ Atlantapseudes nigrichela. ” Băcescu (1978) described them having an anterolateral spine on the lateral margin of pereonites 1 and 2 (cf. Băcescu 1978, fig. 1A). Our re-examination of two of Băcescu’s specimens, however, revealed that the spine originates from the coxa of pereopods 1 and 2, rather than from pereonites 1 and 2. This was also true for the monodentate “ A. nigrichela ” of Błażewicz-Paszkowycz et al. (2011: fig. 6B). As the anterolateral spine on pereonite-2 was the key character distinguishing Atlantapseudes sp. from the monodentate species A. cyanea Bamber, 2007, our finding meant that Atlantapseudes sp. is difficult to distinguish from the latter (Table 1). Because we could not observe most appendages in detail, we refrain from making conclusions about the taxonomic status of Atlantapseudes sp.