Plumularia sp. 2

Agís, José Ansín, Vervoort, Willem & Ramil, Fran, 2014, Hydroids of the families Kirchenpaueriidae Stechow, 1921 and Plumulariidae McCrady, 1859 (Cnidaria, Hydrozoa) collected in the Western Pacific Ocean by various French Expeditions, Zoosystema 36 (4), pp. 789-840 : 831

Plumularia sp. 2

( Fig. 26 ; Table 17)

MATERIAL EXAMINED. — Philippines. MUSORSTOM 3, stn DR 117, 12°31.2’- 12°31.3’N, 120°39.3’- 120°39.5’E, 92-97 m, 03.VI.1985: 6 mm high top part of colony ; no gonothecae ( MNHN).

DISTRIBUTION. — Plumularia sp. 2 is recorded only from the Philippines, between 92-97 m depth.

DESCRIPTION

Small fragment 4 mm long, monosiphonic, unbranched and without visible nodes. Axial nematothecae were also not observed.

Apophyses arrangement left and right in one plane. Each apophyses with a well developed mamelon on superior surface and three nematothecae: two axillary and one above the mamelon.

Hydrocladia comprising a succession of thecate internodes separated by oblique nodes, each internode with one hydrotheca and four nematothecae: one mesial inferior, two laterals placed over very low apophyses,and one mesial superior.All nematothecae two-chambered, conical and movable. Hydrotheca small, cup-shaped, adcauline wall fully adnate, abcauline wall straight, rim smooth and circular. Two internal thickenings in each internode next to top and bottom.

Gonothecae not observed.

VARIABILITY

The node between apophyses and first thecate internode was not observed in some cases.

REMARKS

The material is sterile and consists only of a small apical fragment of a colony, which makes a definitive identification difficult.

Figures

FIG. 26. — Plumularia sp. 2, MUSORSTOM 3, stn DR 117, basal internodes of hydrocladia, lateral view. Scale bar: 0.1 mm.