Bowmaniella

Heard, Richard W. & Price, W. Wayne, 2006, Revision of Bowmaniella sensu B cescu, 1968 (Crustacea: Mysida: Mysidae: Gastrosaccinae): a taxonomic conundrum, Zootaxa 1269, pp. 1-29 : 6-7

Genus Bowmaniella , n.g

Archaeomysis .— Tattersall, 1932, 1951: 86 (in part, not Archaeomysis Czerniavsky, 1882 ).

Gastrosaccus .— Tattersall, 1951: 89 (in part, not Gastrosaccus Norman, 1868 ). Bowmaniella Bäcescu, 1968: 356 . (nomen nudum).

Bowmaniella (Coifmanniella) Bäcescu, 1968: 356 (in part) (nomen nudum).

Diagnosis. Carapace with posterodorsal margin having mid­dorsal lobe convex and adjacent medial lobes quadrate not attenuated or reflected anteriorly ( Fig. 8 F). Abdominal segment 5 with articulated process present on posterodorsal margin. Third male pleopod highly modified; terminal male without bow ( Figs. 2 D), or if bow present ( Fig. 6 D, E), lacking apophysis; penultimate male lacking ventral process on outer branch, inner stylet present on inner branch ( Figs. 2 C, 6C). Uropodal endopod lacking small spiniform­setae immediately distal to statocyst ( Fig. 5 A, B). Telson cleft shallow, less than 15% of telson length ( Fig. 4 A, B).

Type species. Gastrosaccus dissimilis Coifmann, 1937 , here designated.

Other species. Bowmaniella banneri ( Băcescu, 1968) .

Etymology. The genus was named in honour of the late Thomas Bowman, Senior Curator of the Division of Crustacea, National Museum of Natural History, The Smithsonian Institution.

Remarks. As now defined Bowmaniella n. g. contains two species, the type B. dissimilis ( Coifmann, 1937) from the western Atlantic, and its eastern Pacific cognate, B. banneri ( Băcescu, 1968) . Bowmaniella is characterized by: (1) an articulated, posterodorsal process on the fifth abdominal segment (see Fig. 1 ); (2) the ultimate or terminal male form with third pleopod lacking a bow, or if bow present, lacking apophysis; (3) the penultimate male form with third pleopod lacking ventral process on outer branch and having an inner stylet present on inner branch; (4) lacking small spiniform­setae posterior to the uropodal statocyst; and (5) the posterodorsal margin of carapace having mid­dorsal lobe convex with adjacent medial lobes quadrate, not attenuated or reflected anteriorly. Based on examination of type material and the literature, two of the four nominal species attributable to Bowmaniella n. g. are synonyms. The status of these synonymies is discussed in the remarks section for the type species.

Figures

FIGURE 1. Bowmaniella dissimilis (Coifmann, 1937), lateral view of the penultimate male (from Bäcescu 1968).

FIGURE 2. Tip of male pleopod 3. Coifmanniella johnsoni (Tattersall, 1937): A, penultimate form; B, ultimate form (from Brattegard 1970 a). Bowmaniella dissimilis (Coifmann, 1937): C, penultimate form (from Stuck et al. 1979 a); D, ultimate form (from Stuck et al. 1979 a). Scale 1 = 0.1 mm for A; scale 2 = 0.5 mm for D, 1.0 mm for B, C.

FIGURE 4. Telsons. A, Bowmaniella dissimilis (Coifmann, 1937) (after Stuck et al. 1979 a); B. Bowmaniella banneri Bäcescu, 1968 (after Holmquist 1975); C, Coifmanniella johnsoni (Tattersall, 1937) (after Tattersall 1937); D, Coifmanniella mexicana (Tattersall, 1951) (after Stuck et al. 1979 a); E, Coifmanniella merjonesi (Bäcescu, 1968) (after Bäcescu, 1968); F, Coifmanniella parageia (Brattegard, 1970) (after Brattegard 1970 a) with enlargement of lateral margin showing setation. Scale 1 = 0.2 mm for B; scale 2 = 0.8 mm for A, C – E; 1.0 mm for F.

FIGURE 5. Uropods. A, Bowmaniella dissimilis (Coifmann, 1937) (after Stuck et al. 1979 a); B. Bowmaniella banneri (Bäcescu, 1968) (after Holmquist 1975); C, Coifmanniella johnsoni (Tattersall, 1937) (after Brattegard 1970 a); D, Coifmanniella mexicana (Tattersall, 1951) (after Stuck et al. 1979 a); E, Coifmanniella merjonesi (Bäcescu, 1968) (after Bäcescu 1968); F, Coifmanniella parageia (Brattegard, 1970) (after Brattegard 1970 a). Scale 1 = 0.2 mm for B; scale 2 = 0.4 mm for E; 0.7 mm for A, D; scale 3 = 1.0 mm for C, F.

FIGURE 6. Tip of male pleopod 3. Bowmaniella dissimilis (Coifmann, 1937): A, penultimate form (from Stuck et al. 1979 a); B, ultimate form (from Stuck et al. 1979 a). — Bowmaniella banneri (Bäcescu, 1968): C, penultimate form; D, E, ultimate form, lateral and medial aspects, respectively (from Holmquist 1975). Scale = 0.2 mm.

FIGURE 8. Gastrosaccus madagascariensis Wooldridge, Mees, & Webb, 1997: A, female pleopod 1; B, female pleopod 2 (from Wooldridge et al. 1997). — Gastrosaccus trilobatus Murano & McLachlan, 1998: C, labrum (from Murano & McLachlan 1998). — Eurobowmaniella simulans (Tattersall, 1915): D, labrum (from Murano 1995). – Archaeomysis ochotensis Hanamura, 1997: E, male pleopod 3. — Bowmaniella dissimilis (Coifmann, 1937): F, posterior margin of carapace showing non­reflected medial lobes (from Brattegard 1970 a). — Coifmanniella parageia (Brattegard, 1970): G, posterior margin of carapace showing reflected medial lobes (from Brattegard 1970 a) Scale 1 = 0.25 mm for A, B; 0.5 mm for E; scale 2 = 0.25 mm for D; 0.5 mm for C, F, G.