. Bulletin. Natural history; Natuurlijke historie. 46 Peabody Museum Bulletin 46. Figure 31. Parhyalella steelei Lazo-Wasem and Gable, new species, YPM 9381, male holoU^e, mm. Abbreviations: P, pereopod; U, uropod. Our guiding statements, unfortunately, apply only to males; more study of female char- acters is necessary before most females in Parhyalella can be distinguished with certainty. The primary diagnostic features for Parhyalella are: (1) the presence or absence of medial setae on article 5 of gnathopod 1, including their number when present, and (2) the number of conjointed segmen
. Bulletin. Natural history; Natuurlijke historie. 46 Peabody Museum Bulletin 46. Figure 31. Parhyalella steelei Lazo-Wasem and Gable, new species, YPM 9381, male holoU^e, mm. Abbreviations: P, pereopod; U, uropod. Our guiding statements, unfortunately, apply only to males; more study of female char- acters is necessary before most females in Parhyalella can be distinguished with certainty. The primary diagnostic features for Parhyalella are: (1) the presence or absence of medial setae on article 5 of gnathopod 1, including their number when present, and (2) the number of conjointed segments of the flagellum of article 1 on antenna 2. Other features, such as the morphology or appearance of the eyes, the shape of the palm of gnathopod 1, and the presence of a simple or bifurcate dactyl on gnathopod 1, are additional characters useful in differentiating the species. The presence of medial setae on the anterior margin of article 5, gnathopod 1, serves to separate P. batesoni, P. congoensis, P. pietschmanni and P. whelpleyi from all the newly described species. In P. batesoni and P. whelpleyi this character is represented by a single small seta. In P. whelpleyi, antenna 2 flagellum article 1 is 3-conjointed, and the dactyl of gnathopod 1 is bifurcate. In contrast, antenna 2 of P. batesoni has a 5-conjointed flagellar article 1, and the dactyl of gnathopod 1 is simple. Parhyalella pietschmanni and P. congoensis both have multiple medial setae, rather than a single seta, on the anterior margin of article 5 of gnathopod 1. These two species are clearly distinguished by the number of these setae (two in P. pietschmanni and four in P. congoensis). The number of conjointed flagellar segments of article 1 of antenna 2. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Peabody Museum of Natural History. Ne
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