. Bulletin of the Natural History Museum Zoology. PHYLOGENY OF ARIETELLID COPEPODS 143. Fig. 25. Metacalanus sp. 1, female (A); Metacalanus sp. 2, female (B). SEM micrographs of mouthparts. A. Detail of segments IV to VIII of antennary exopod, scale bar = 10 ; B, Mandibular endopod, indicated by arrow, scale bar = 5 Metacalanus species 2 (Figs 21A,24,25B,26H) Material examined. 4$$- Body length. , , , mm. Description. Female. Cephalosome separate from first pedigerous somite. Lateral lobe of last prosomal somite produced backwards reaching halfway along second urosomal
. Bulletin of the Natural History Museum Zoology. PHYLOGENY OF ARIETELLID COPEPODS 143. Fig. 25. Metacalanus sp. 1, female (A); Metacalanus sp. 2, female (B). SEM micrographs of mouthparts. A. Detail of segments IV to VIII of antennary exopod, scale bar = 10 ; B, Mandibular endopod, indicated by arrow, scale bar = 5 Metacalanus species 2 (Figs 21A,24,25B,26H) Material examined. 4$$- Body length. , , , mm. Description. Female. Cephalosome separate from first pedigerous somite. Lateral lobe of last prosomal somite produced backwards reaching halfway along second urosomal somite (Fig. 24A). Genital double-somite (Figs 21A,24A) wider than long, symmetrical, with paired gonopores and copulatory pores located ventrolaterally near posterior end of somite; each gonopore lacking outer cuticular lateral flap found in M. species 1, anterior half opening, covered by oval flap; copulatory pore (Fig. 24C,D) small, round, ca. |xm in diameter, located near anterior inner corner of gonopore (spermatophore remnant attached to opening). Internal geni- tal system similar to that of M. species 1. Anal operculum triangular as in M. species 1. Antennule asymmetrical, left longer than right, different in fusion pattern and armature (see Fig. 22). Right antennule: segments X to XI, and XIV and XV only partly fused near posterior margin; fusion pattern and armature as follows: I-VI-12 + 2 aesthetascs (1-3 + aesthetasc, II—1, III-2 + aesthetasc, IV-2, V-2, VI-2), VII-1 + aesthetasc, VIII-1, IX-X-3 + aesthetasc (IX-1 + aesthetasc, X-2), XI-2 + aesthetasc, XII-2 + aesthetasc, XIII-1 + aesthetasc, XIV-2 + aesthetasc, XV-2 + aesthetasc, XVI-2 + aesthetasc, XVII-2 + aesthetasc, XVIII-2 + aesthetasc, XIX-2 + aesthetasc, XX-1 + aesthetasc, XXI-2 + aesthetasc, XXII-1, XXIII-1, XXIV-XXVIII-12 + 2 aesthetascs (XXIV-1 + 1, XXV-1 + 1 + aesthetasc, XXVI-XXVIII-8 + aesthetasc). Left antennule: segments X and XI partly fused near posterior margin; suture between segments XI an
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