Gonaxia ampullacea Vervoort, 1993

Galea, Horia R., 2016, Notes on some sertulariid hydroids (Cnidaria: Hydrozoa) from the tropical western Pacific, with descriptions of nine new species, European Journal of Taxonomy 218, pp. 1-52 : 8-9

Gonaxia ampullacea Vervoort, 1993

Figs 2B , 3 C–D

Gonaxia ampullacea Vervoort, 1993: 121 , figs 6c, 7a–c, 9.

Material examined

BATHUS 4: DW914, a 3.5 cm high colony with unbranched stem, bearing male gonothecae (MNHN- IK- 2012 -16522).

Remarks

As stated above, the larger size and the more acute angle formed by the free part of the hydrocladial hydrothecae with the axis of cladia were used to assign this material to G. ampullacea . As in G. amphorifera , some hydrothecae exhibit incipient lateral diverticuli ( Fig. 3C ).

Geographical distribution

New Caledonia ( Vervoort 1993; present study).

Figures

Fig. 2. ― A. Gonaxia amphorifera Vervoort, 1993 (SMIB 6, Stn. DW127), portion of stem with cladium. ― B. Gonaxia ampullacea Vervoort, 1993 (BATHUS 4, Stn. DW914), portion of stem with cladia. ― C. Gonaxia compacta Vervoort, 1993 (BATHUS 4, Stn. DW923), portion of stem with cladium. ― D. Gonaxia intermedia Vervoort, 1993 (BATHUS 4, Stn. CP906), portion of stem with cladium. ― E. Gonaxia sinuosa Vervoort, 1993 (SMIB 4, Stn. DW40), portion of stem with cladia. Scale bar: A–E = 1 mm.

Fig. 3. ― A–B. Gonaxia amphorifera Vervoort, 1993 (SMIB6, Stn. DW127). A. Two successive cladial internodes with their hydrothecae. B. Portion of stem with male gonothecae. ― C–D. Gonaxia ampullacea Vervoort, 1993 (BATHUS 4, Stn. DW914). C. Two successive cladial internodes with their hydrothecae. D. Portion of stem with male gonothecae. ― E–F. Gonaxia compacta Vervoort, 1993 (BATHUS 4, Stn. DW923). E. Two successive cladial internodes with their hydrothecae. F. Abortive gonotheca (of undetermined sex) originating from within a hydrotheca. ― G–K. Gonaxia intermedia Vervoort, 1993 (BATHUS 4). G. Two successive cladial internodes with their hydrothecae (Stn. CP906). H. Portion of stem with male gonothecae (Stn. CP906). I. Portion of stem with female gonothecae (Stn. CP906). J–K. Abortive gonothecae arising from hydrothecal lumina (Stn. DW902). ― L–N. Gonaxia sinuosa Vervoort, 1993 (SMIB 4, DW40). L. Two successive cladial internodes with their hydrothecae. M–N. Two female gonothecae. Scale bars: A, C, E, G, L = 300 µm; B, D, F, H–K, M–N = 1 mm.