Spathione, Boyko & Van Der Meij, 2018

SPATHIONE View in CoL GEN. NOV.

urn:lsid:zoobank.org:act:B47EFD34-1336-48F2-B0AD-E3C0B6CD0584

Diagnosis

Female: Body compact, little deflected except for head with slight sinistral deflection. Head about as long as wide, overlapping almost entire first pereomere medially, inflated dorsoventrally, small lateral eyes present, frontal lamina present but very thin. Antennule of four segments; antenna of two segments. All pereomeres distinct, body highly vaulted ventrally, coxal plates very small, pronounced tergal projections on pereomeres one to seven, those on one to four irregular in shape, those on five to seven smooth and rounded at ends (similar to appearance of lateral plates); five pairs of well-developed oostegites on pereomeres I–V, completely closing marsupium. Maxilliped palp lacking. Five pleomeres plus pleotelson, lateral plates well developed, tubular, rounded distally and recurved; biramous tubular pleopods on pleomeres I–IV as ventrally directed extensions of lateral plates; uniramous pleopods on pleomere V, bulbous uniramous uropods.

Male: Longer than broad, all segments clearly separated; abdomen not abruptly narrower than pereon, tapering anteriorly and posteriorly. Head ovate, eyes present. Antennae of four segments; antennules of two segments. Anterior pereomeres straight; posterior pereomeres and pleomeres curved posterolaterally (in dorsal view) and curved ventrally (in lateral view). Dactyli and propodi of all pereopods subequal. Four pleomeres plus pleotelson, distal margins rounded, no midventral tubercles on pleon; pleopods and uropods lacking.

Type and only species