. Bulletin of the Natural History Museum Zoology. 128 S. OHTSUKA, BOXSHALL AND ROE Remarks. The present study revealed that Paraugaptilus mohri Bjornberg, 1975 belongs to the genus Arietellus (see below). Arietellus shows sexual dimorphism in the antenna and mandibular palp, as described in Paraugaptilus by Deevey (1973). However, no sexual dimorphism is exhibited in the maxillule, the maxilla and the maxilliped. Ecological note. Species of the genus are pelagic and distributed in deep water throughout the world's oceans (Brodsky, 1950; Vervoort, 1965; Roe, 1972, unpublished data;
. Bulletin of the Natural History Museum Zoology. 128 S. OHTSUKA, BOXSHALL AND ROE Remarks. The present study revealed that Paraugaptilus mohri Bjornberg, 1975 belongs to the genus Arietellus (see below). Arietellus shows sexual dimorphism in the antenna and mandibular palp, as described in Paraugaptilus by Deevey (1973). However, no sexual dimorphism is exhibited in the maxillule, the maxilla and the maxilliped. Ecological note. Species of the genus are pelagic and distributed in deep water throughout the world's oceans (Brodsky, 1950; Vervoort, 1965; Roe, 1972, unpublished data; Campaner, 1984). Arietellus plumifer Sars, 1905 (Figs 13-15,17A,18L) Material examined. 2 $ and cf. Body length. $ mm (28 VI 1985), mm (26 XI 1965); Cf mm. Description. Female. Cephalosome separate from first pedi- gerous somite. Genital double-somite (Figs 13A,B,14) as long as wide, almost symmetrical, with pair of gonopores ventrolat- erally and anterior to single ventromedial copulatory pore; paired copulatory ducts chitinized, each running anteriorly to connect with seminal receptacle near genital operculum; semi- nal receptacle located lateromedialfy, half as long as double- somite, produced posteriorly with rounded posterior tip, tapering anteriorly; receptacle duct beneath copulatory duct, opening near inner corner of genital operculum. Antennule symmetrical, 20-segmented; seventh (X) to ninth (XII) segments and 11th (XIV) and 12th (XV) seg- ments only partly fused. Fusion pattern and armature ele- ments as follows: I-IV-9 + 2 aesthetascs, V-2 + aesthetasc, VI-2, VII-2 + aesthetasc, VIII-2, IX-2 + (small) aesthetasc, X-2, XI-2 + aesthetasc; XII-2, XIII-2 + aesthetasc, XIV-2 + aesthetasc, XV-2 +aesthetasc, XVI-2 + aesthetasc, XVII-2 + aesthetasc, XVIII-2 + aesthetasc, XIX-2 + aesthetasc, XX-2 + aesthetasc, XXI-2 + aesthetasc,XXII-l, XXIII-XXVIII-12 + 2 aesthetascs (Fig. 13C). First (I-IV) to seventh segments fringed with long setules along posterior margin.
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Keywords: ., bhlconsortium, bookc, bookcentury1900, bookcollectionbiodiversity
