On a collection of shallow-water hydroids (Cnidaria: Hydrozoa) from Guadeloupe and Les Saintes, French Lesser Antilles Author Galea, Horia R. text Zootaxa 2008 1878 1 54 journal article 10.5281/zenodo.184149 086e0d63-8af0-4ad1-8884-03fa56b5ea98 1175-5326 184149 Antennella sp. (fig. 7K– O , table 13) Material examined . Stn. 6 : 23.03.2008 —numerous sterile colonies, up to 9 mm high, on Halimeda sp. and Caulerpa sp. ( MHNG INVE 60984); 24.03.2008 —one sterile colony, ca . 9 mm high, on Caulerpa sp. Stn. 7 : 25.03.2008 – numerous sterile stems, up to 6 mm high, on concretions and green algae. Type locality . Plage de Pompière, Terre-de-Haut, Les Saintes, Guadeloupe . Description . Stems up to 9 mm high, arising from creeping hydrorhiza. Basal part, of variable length, divided by means of 2–3 transverse nodes; last node oblique; segments with up to 8 frontal nematothecae in two parallel, alternate rows. Remainder of caulus heteromerously segmented. Hydrothecate segments, up to 13 per stem, with proximal oblique node and distal transverse node; with one hydrotheca in middle part and up to 4 nematothecae: one median inferior and a pair of laterals; the 2–3 basalmost hydrothecae often with a supra-axillar nematotheca, arising a short distance above axil, rim not surpassing free adcauline wall (fig. 7M). Intersegments, longer than segments, with 2 frontal nematothecae in a row parallel to stem axis. Hydrothecae nearly tubular, lateral walls parallel, rim circular, slightly everted. All nematothecae bithalamic; lateral nematothecae with circular rim, not scooped. Gonothecae not seen. Nematocysts: large microbasic mastigophores, in coenosarc and nematophores; microbasic mastigophores, in tentacles (for dimensions, see table 13). TABLE 13. Comparative measurements of Antennella sp. and A. secundaria (Gmelin, 1791) , in µm.

Antennella sp. Stn. 6 (present study)	A. secundaria Stn. 2 (present study)
Hydrotheca – abcauline side	145–150	180–200
– free adcauline side	100–105	115–120
– diameter at rim Caulus	160–165	215–230
– length hydrothecate segments	270–305	185–255
– length ahydrothecate segments – diameter at node	380–490 40–45	310–365 45–80
Cnidome
- large microbasic mastigophores - undischarged	(12.4–13.8) × (4.7–5.1)	(13.7–16.1) × (5.3–6.0)
- discharged	(11.4–12.6) × (4.3–4.6)	(15.4–15.7) × (5.7–5.8)
- shaft - small microbasic mastigophores	(10.0–11.0) × (1.4–1.7) ca . 5.8 × 1.7	(12.8–14.3) × (1.4–1.6) ca . 5.8 × 1.7
- ovoid capsules of unidentified type	likely absent	(4.3–4.6) × (2.7–2.8)

Remarks . Antennella sp. comes very close to A. secundaria ( Gmelin, 1791 ) . However, there is no axillar nematotheca in the former, but some of its basalmost hydrothecae bear one nematotheca a short distance above the axil. Additionally, the cnidome of the latter contains several egg-shaped capsules of unidentified type , apparently not present in the former. In the absence of gonothecae, no positive identification of the present material could be made. A morphometrical comparison between Antennella sp. and A. secundaria is given in table 13. Distribution . The present material originates from Les Saintes.