Jassashawi Conlan, 1990

Conlan, Kathleen E., Desiderato, Andrea & Beermann, Jan, 2021, Jassa (Crustacea: Amphipoda): a new morphological and molecular assessment of the genus, Zootaxa 4939 (1), pp. 1-191 : 131-133

Jassashawi Conlan, 1990

( Table 12 , Figs 83–84 )

Diagnosis.

Both sexes:

Mandibular palp: article 2, dorsal margin without a fringe of setae.

Maxilla 1: without a seta or setal cluster at the base of the palp article 1.

Gnathopod 1: basis, anterolateral margin with one short seta at distal angle; carpus with a short seta medially, at the anterodistal junction of the propodus (seta length <15% of the carpus length).

Gnathopod 2: basis without a row of setae along the anterolateral margin; carpus and propodus, setae on the anterior margin short and simple (setal length <basis width).

Pereopods 5–7: propodus not expanded anteriorly.

Uropod 1: ventral peduncular spinous process very short, underlying only about 10% of the longest ramus.

Uropod 3: inner ramus without spines mid-dorsally (with only the single apical spine).

Telson: tip without apical setae (only the usual short setae at each dorsolateral cusp).

Thumbed male: unknown.

Adult female:

Antenna 2: without plumose setae on the flagellum and peduncular article 5.

Gnathopod 2: propodus, palm concave, palmar defining angle acute.

Remarks. Conlan (1990) was in error about the absence of a seta at the anterodistal junction of carpus with the propodus on gnathopod 1. There is one present slightly medially ( Fig. 83 ). The seta is short and difficult to see but present in both sexes. Only 2 subadult males, 2 adult females and 1 immature were available for study so variation and the appearance of the thumbed adult male could not be determined.

Figures

FIGURE 83. Jassa shawi Conlan, 1990. Holotype, juvenile male, 6.8 mm, NMCC 1987-1133; allotype, adult female, ovigerous, 5.6 mm, NMCC 1987-1134 (CMN). Bamfield Marine Sciences Centre, Barkley Sound, Vancouver Island, British Columbia, 24 June 1976, E. L. Bousfield, coll., station B1, on settling blocks suspended from floating dock at the water’s surface, 1976-157 (CMN). Lateral view: whole body; dorsal views: uropod 1 magnification, telson; other views medial.Appendages are of the holotype unless noted otherwise. Scale 0.1 mm. Illustration after Conlan (1990).

FIGURE 84. Jassa shawi Conlan, 1990. Holotype, juvenile male, 6.8 mm, NMCC 1987-1133. Bamfield Marine Sciences Centre, Barkley Sound, Vancouver Island, British Columbia, 24 June 1976, E. L. Bousfield, coll., station B1, on settling blocks suspended from floating dock at the water’s surface, 1976-157 (CMN). Mouthparts. Frontal view: upper lip; lateral view: maxilla 2; other views medial. Scale 0.1 mm.