Corymorpha gracilis ( Brooks, 1883 )

Schuchert, Peter & Collins, Richard, 2021, Hydromedusae observed during night dives in the Gulf Stream, Revue suisse de Zoologie 128 (2), pp. 237-356 : 277

publication ID

https://doi.org/ 10.35929/RSZ.0049

publication LSID

lsid:zoobank.org:pub:8382D1CA-7C0E-4B1C-9591-4CEAA2F296FB

DOI

https://doi.org/10.5281/zenodo.5710606

persistent identifier

https://treatment.plazi.org/id/D0118A7C-5B25-003D-FF31-FC9CFBFC7DA4

treatment provided by

Felipe

scientific name

Corymorpha gracilis ( Brooks, 1883 )
status

 

Corymorpha gracilis ( Brooks, 1883) View in CoL View at ENA

Fig. 25 View Fig A-B

Steenstrupia gracilis Brooks, 1883: 144 View in CoL .

Steenstrupia rubra View in CoL . – Mayer, 1910: 31, pl. 1 fig. 7. [not Steenstrupia rubra Forbes, 1848 View in CoL = Corymorpha nutans M. Sars, 1835 View in CoL ]

Euphysora gracilis View in CoL . – Kramp, 1959a: 89, fig. 40a. – Kramp, 1961: 40. – Goy, 1979: 269, fig. 2.

Corymorpha gracilis View in CoL . ‒ Nagata et al., 2014: 299 View Cited Treatment , fig. 9.

not Euphysora gracilis View in CoL – Pagès et al., 1992: 20, fig. 18.

Examined material: BFLA4368 ; 1 specimen; size 4 mm; preserved in ethanol for DNA extraction; 16S sequence MW528715 View Materials . BFLA4401 ; 1 specimen; size 6 mm; preserved in ethanol for DNA extraction; 16S sequence identical to MW528715 View Materials .

Observations: Umbrella bell-shaped, height 4 to 6 mm, about two times higher than wide, with very large, pointed apical process, often of the same size as the umbrella. No gastric peduncle. Manubrium tubular with some tapering towards mouth, length about 1/2 to 4/5 of the subumbrellar height, with long, conspicuous apical canal entering apical process ( Fig. 25 View Fig A-B), distal end often somewhat thickened and yellow in colour. Gonads wrapping manubrium entirely without perradial interruptions. Marginal tentacles of distinct types, one long, extensible tentacle with up to 7 large, oblong nematocyst clusters encircling tentacle entirely, some smaller annular nematocyst, clusters can be present, terminal cluster oblong and slightly thicker than annular ones. The annular clusters may be absent and only a few small clasping clusters can be present (likely in regeneration after tentacles loss). Other tentacles reduced to mere cones, the one opposite the longer tentacle about twice as long as the other two. Radial canals fine, but well visible due to white-yellowish pigmentation. Gastrodermis of tentacles with some red hues.

16S Data: A blastn search in GenBank using the sole 16S indicated Corymorpha nutans as best match, although with only 89% identity. This species was followed by other Corymorpha and Aplanulata species with similar low identity scores.

Distribution: Atlantic cost of the USA from New England to Florida ( Brooks, 1883; Kramp 1959); Brazil ( Kramp, 1959; Nagata et al., 2014); South Atlantic ( Goy, 1979). Doubtful records from the Benguela current ( Pagès et al., 1992). Type locality: USA, North Carolina, Newport River.

Remarks: The specimen depicted by Pagès et al. (1992) and identified as Euphysora gracilis (syn. Corymorpha gracilis ) lacked the typical large apical projection with the gastrodermal process in it. It is therefore not unambiguously attributable to Corymorpha gracilis .

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Anthoathecata

Family

Corymorphidae

Genus

Corymorpha

Loc

Corymorpha gracilis ( Brooks, 1883 )

Schuchert, Peter & Collins, Richard 2021
2021
Loc

Euphysora gracilis

Pages F. & Gili J. M. & Bouillon J. 1992: 20
1992
Loc

Euphysora gracilis

Goy J. 1979: 269
Kramp P. L. 1961: 40
Kramp P. L. 1959: 89
1959
Loc

Steenstrupia rubra

Mayer A. G. 1910: 31
1910
Loc

Steenstrupia gracilis

Brooks W. K. 1883: 144
1883
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