New additions to the shallow-water hydroids (Cnidaria: Hydrozoa) of the French Lesser Antilles: Martinique
Author
Galea, Horia R.
text
Zootaxa
2013
3686
1
1
50
journal article
37008
10.11646/zootaxa.3686.1.1
b5a2eb3f-2555-41ba-a303-9fac9d2618c3
1175-5326
284148
17A93C58-F09C-484A-A26A-F4F27BC91A6C
Aglaophenia postdentata
Billard, 1913
(
Fig.
8
I–N)
Material examined
.
Stn. 14
,
20.ii.2012
, 1 m,
M233
: numerous plumes, some fertile (female) on
Dyctiota
sp. (MHNG-INVE-82877).
11. Nutting (1900) reported on up to 4 nematothecae.
12. A female gonotheca seen in the present material exhibited a pedicel composed of three segments instead of only two. 13. Their movement could be demonstrated using a fine syringe needle.
Remarks
. Sterile material of this species was reported for the first time from the Caribbean in an earlier account on the hydroids of
Guadeloupe
(
Galea 2010a
). The present specimens from
Martinique
are fertile and confirm the previous identification. It is interesting to note some minor differences, as for instance the presence of shorter stem internodes and cormidia in material from
Martinique
(compare
Fig.
8
I and J, and
Fig. 8
K and L, respectively).
To the description of corbula by
Millard & Bouillon (1973)
, it is worth adding the following: 1) the rachis is divided into internodes by oblique nodes slanting in opposite directions; each internode is provided with a laterodistal apophysis and two nematothecae in the axil formed by the apophyses and internode; each nematotheca is situated on one side of the rachis: one points towards the interior of the corbula, the other outwardly; 2) the costae may occasionally be branched (
Fig. 8
M), and bear up to 7 pairs of laterally placed nematothecae; 3) the latter are short, gutter-shaped, with wide aperture extending from top to base, and a small foramen communicating with the costal internode (
Fig. 8
N).
Geographical distribution
. See
Galea (2010a)
.