Pontostratiotes scotti Brotskaya 1959

Pontostratiotes scotti Brodskaya, 1959

Pontostratiotes abyssicola G. S. Brady—Scott, 1910, pp. 53–54, pls. 2–3.

Pontostratiotes scotti Brodskaya, 1959, p. 1787.

Eight ♀♀ and 2 juvenile specimens, in samples 399A, 400A, and 410A.

Body length including furca, 2.44 mm; length of furca, 0.81 mm. Cephalon inflated and slightly quadrate.

Rostrum round with 2 median spherical inflations (statoblasts?). Cephalon with posterolateral angles forming a triangular serrulate denticle; posterior margin serrulate; dorsal spines slightly divergent, short, serrulate, only slightly exceeding posterior edge of 3rd thoracic segment. First thoracic segment narrow and hidden under cephalon. Lateral spines of the 3 thoracic segments short and curved, minutely serrulate. Dorsal posterior margins of segments serrulate; 2nd segment with 2 strong dorsal spines; 3rd and 4th segments with 4 less prominent spines. Proximolateral retinacula of the segments rounded, with serrulations only on external edges. Dorsally, small and round surface tubercles are present on cephalon (3 pairs): 1 central tubercle on 2nd segment; 1 pair on 3rd and 4th segments. Tubercles are found also at about mid-lengths of lateral spines. Abdominal segments with uniformly denticulate posterior edges. Genital segment and last abdominal segment slightly pubescent. Pubescence found also on furcal branches.

Antennular joints with the following proportionate lengths: 31:24:17:3.5:9:4:3:7. First joint with denticulate surface and with pubescence on external edge. Proximal spine bears 2 groups of denticles, one of which points backward. Distal edge of 1st joint slightly protruding at both angles. Second joint with 4 processes: 1st and 3rd blunt, 2nd and 4th prominent. Antennal exopodite relatively well developed. Mandibular palp with elongated basis and very long and narrow endopodite bent backward parallel to basis. Maxilliped relatively slender.

First endopodite joint of PI only slightly longer than 2nd and 3rd combined.

Setal formula as follows:

exopodite

endopodite

PI

1.1. 222

1.1. 221

PII

1.1. 223

1.1. 221

PIII

1.1. 223

1.2. 321

PIV

1.1. 323

1.1. 221

Swimming legs with normal setae and relatively narrow joints.

PV clearly 3-jointed. Length-width ratio of distal joint: 26/6; spines long, setiform; distal seta of 2nd joint long and slender.

PVI long and narrow, with 3 setae; medial seta short.