Halecium dichotomum Allman, 1888, Allman, 1888

Galea, Horia R., 2013, New additions to the shallow-water hydroids (Cnidaria: Hydrozoa) of the French Lesser Antilles: Martinique, Zootaxa 3686 (1), pp. 1-50: 16-18

publication ID

http://dx.doi.org/10.11646/zootaxa.3686.1.1

publication LSID

lsid:zoobank.org:pub:17A93C58-F09C-484A-A26A-F4F27BC91A6C

DOI

http://doi.org/10.5281/zenodo.5263617

persistent identifier

http://treatment.plazi.org/id/D6410C37-BF44-FFE4-FF36-F8FBFDEEFDCF

treatment provided by

Plazi

scientific name

Halecium dichotomum Allman, 1888
status

 

Halecium dichotomum Allman, 1888  

( Fig. 4 View FIGURE 4. A K–Q)

Halecium dichotomum Allman, 1888: 13   , pl. 6.― Billard, 1910: 4.― Stechow, 1925: 419.― Millard, 1957: 188; 1966: 466, fig. 10 A–K; 1968: 256; 1975: 147, fig. 48 A–G.― Migotto, 1996: 31, fig. 6 F, G.

not Halecium cf. dichotomum   ― Gili et al., 1989: 78, fig. 8.

Material examined. Stn. 2, 22.ii.2012, 1 m, M 245: small female and male colonies on Sertularella diaphana (Allman, 1885)   .

Remarks. No dichotomic arrangement of the lateral hydrophores, so characteristic of Allman's (1888) species, could be seen in this epizoic material with dwarfed, poorly developed colonies. However, the presence of both male and female gonothecae support this correct identification. The perisarc of gonothecae of both sexes has a filmy appearance and is easily collapsible, and wrinkled surfaces are less regularly marked than in earlier accounts ( Millard 1966, Migotto 1996), especially in males.

Two types of nematocysts occur in this species ( Fig. 3 View FIGURE 3. A, B Q): 1) microbasic mastigophores, ca. 5.9 × 1.6 µm, abundant in the tentacles, also scattered in the coenosarc; 2) larger and wider capsules with conspicuous shaft, (8.8–9.3)×(3.7 –4.0) µm, occurring in the coenosarc. Since no discharged capsules of the latter type were found, I follow Migotto (1996) in considering them to be pseudostenoteles.

Geographical distribution. South Africa ( Allman 1888; Stechow 1925; Millard 1975), Brazil ( Migotto 1996), eastern Caribbean (present study).

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Leptothecata

Family

Haleciidae

Genus

Halecium

Loc

Halecium dichotomum Allman, 1888

Galea, Horia R. 2013
2013
Loc

Halecium cf. dichotomum

Gili 1989: 78
1989
Loc

Halecium dichotomum

Migotto 1996: 31
Millard 1957: 188
Stechow 1925: 419
Billard 1910: 4
Allman 1888: 13
1888