Coryne

Galea, Horia R., 2008, On a collection of shallow-water hydroids (Cnidaria: Hydrozoa) from Guadeloupe and Les Saintes, French Lesser Antilles, Zootaxa 1878, pp. 1-54 : 11-13

publication ID

https://doi.org/ 10.5281/zenodo.184149

DOI

https://doi.org/10.5281/zenodo.4669108

persistent identifier

https://treatment.plazi.org/id/038A8789-FFE3-C14F-FF1E-703024DB7BF5

treatment provided by

Plazi

scientific name

Coryne
status

 

Coryne View in CoL sp.

(fig. 3A–D)

Material examined. Stn. 3: 01.04.2008 —several colonies of various sizes, some with propagulae and/or medusa buds, on algae and concretions. Stn. 7: 25.03.2008 —a few sterile colonies, some hydranths with propagulae, on concretions ( MHNG INVE 60982); 29.03.2008 —a small, sterile colony, propagulae absent, on hydrocoral.

Description. Colonies stolonal, cauli relatively short (0.2–2.3 mm high); perisarc smooth, diameter gradually increasing from base (105–120 µm) towards distal end (170–260 µm). Hydranths cylindrical, 0.5–2.0 mm high, 300–325 µm wide, hypostome short, dome-shaped. Perisarc collar at hydranth base absent. One whorl of 4 tentacles around hypostome held nearly vertically; five additional, more or less distinct rows of lower tentacles scattered over 2/3–3/4 of body; a total of up to 26 tentacles per hydranth; all capitate, filiform tentacles absent. Oral tentacles with diameter of capitula exceeding those of lower tentacles (115–125 µm vs. 70–100 µm); stalks short and slightly tapering distally, length decreasing from distal to proximal row. Some stems with lateral, branch-like structures covered with perisarc, these irregularly ramified several times; propagulae budded off from open tips; 190–215 µm long, 115–125 µm wide. Gonophores developing among the lowest whorl of tentacles, the latter occasionally less numerous than in sterile specimens; liberated as free medusae; up to 8 buds per polyp. Medusa buds globular to pear-shaped; borne on short pedicels; 4 tentacle bulbs visible as brown patches, each with one red ocellus. No other structures could be examined. Some polyps simultaneously producing frustules and medusae. Color: white-milk to pale pink, hypostome of polyp and manubrium of medusa buds brownish. Cnidome of polyp and propagula (undischarged capsules): two size classes of stenoteles, large (17.8–20.8) × (13.6–14.7) µm and small (8.6–10.4) × (6.6–7.4) µm. Cnidome of medusa buds (undischarged capsules): desmonemes (6.4–7.1) × (3.7–4.1) µm; three distinct size classes of stenoteles, i.e. large (11.4–12.7) × (8.7–10.4) µm, medium-sized (9.3–10.7) × (6.6–8.4) µm, and small (7.1– 7.4) × (5.6–6.1) µm.

Remarks. This species, from areas with high water movement, exhibits two simultaneous modes of reproduction and dispersal: asexual, by massive production and release of frustules, and sexual, liberating free swimming medusae.

The formation of frustules in the genus Coryne has been rarely described, as for instance the South-African record by Millard (1975) of a dwarf, sterile form, provisionally assigned to C. pusilla Gaertner, 1774 .

Due to its peculiar mode of reproduction, the present material may belong to a new species, but I refrain in naming it until the adult medusa is known.

Distribution. Presently known from Guadeloupe and Les Saintes.

MHNG

Museum d'Histoire Naturelle

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Anthoathecata

Family

Corynidae

GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF