Parascyphus repens (Jäderholm, 1904)

Galea, Horia R., 2007, Hydroids and hydromedusae (Cnidaria: Hydrozoa) from the fjords region of southern Chile, Zootaxa 1597 (1), pp. 1-116: 75-76

publication ID

http://doi.org/ 10.11646/zootaxa.1650.1.4

publication LSID

lsid:zoobank.org:pub:BF519BEF-877B-4DFB-A2FA-87710CC7F92B

DOI

http://doi.org/10.5281/zenodo.5098607

persistent identifier

http://treatment.plazi.org/id/7F5A8787-BF09-FFCC-FF0E-FCE89AFCFE84

treatment provided by

Felipe

scientific name

Parascyphus repens (Jäderholm, 1904)
status

 

Parascyphus repens (Jäderholm, 1904)  

(fig. 18A–D, table 30)

Thyroscyphus repens Jäderholm, 1904b: 8   ; 1905: 19, pl. 7 figs 8–10.

Parascyphus repens: Vervoort, 1972a: 95   , fig. 28; Leloup, 1974: 25, fig. 20; Stepanjants, 1979: 61, pl. 10 fig. 3A–B; El Beshbeeshy, 1991: 137, fig. 32.

Material examined. Stn. CCO — 09.iii. 2006, 18 m, S144 (18 m): several sterile colonies, up to 7 mm high, epizoic on Symplectoscyphus sp.   ; S140 (0–20 m): one fertile colony, about 1 cm high, on algae and sponge ( MHNG INVE 53433). Stn. CPA — 09.iii. 2005, 15 m, S170: small colonies, less than 1 cm high, epizoic on Symplectoscyphus subdichotomus   .

Type locality. North Beagle Canal, south of Slogget Bay , Tierra del Fuego   .

Description. Colonies small (up to 1 cm high, rarely more), branched or unbranched, arising from a creeping stolon. Cauli monosiphonic, divided into successive internodes by means of transverse to slightly oblique nodes, not always distinctly marked. Internode ringed or wrinkled proximally; with distal apophysis supporting hydrotheca; apophyses alternately directed left and right. Branching of caulus occasional. Hydrothecae borne directly on stem apophyses or on several successive, short segments. Hydrotheca tubular, tapering basally, with almost straight abcauline wall and basally-swollen adcauline wall; margin with four triangular, pointed cusps; ad- and abcauline cusps smaller than laterals; closing apparatus composed of four triangular plates firmly attached to hydrothecal rim. Gonothecae borne on stem apophyses by means of short, ringed pedicels; large, ovoid, gradually narrowing towards base, apex provided with large, rounded aperture. Gonothecal contents badly preserved.

Remarks. The number of segments which make the junction between stem apophyses and hydrothecae is quite variable. Vervoort (1972a), in his material from the Strait of Magellan and the Atlantic coast of South America, observed 1–3 such segments, while Leloup (1974) found up to 7 in his Chilean specimens. In present material, the hydrothecae are borne either directly on their corresponding stem apophyses (sample S144) or on up to 5 short, quadrangular segments (sample S140).

Hydroid epibionts. Modeeria rotunda ( Quoy & Gaimard, 1827)   .

World distribution. Santa Cruz ( Argentina), Strait of Magellan, and Atlantic coast between Tierra del Fuego and Falkland Islands ( Vervoort 1972a), Crozet ( Stepanjants 1979).

Records from Chile. This species was previously recorded from both Canals Beagle and Chacao, Seno Reloncaví and Golfo de Ancud ( Leloup 1974). The present material originates from both Canals Copihue and Pasaje.

MHNG

Museum d'Histoire Naturelle

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Leptothecata

Family

Thyroscyphidae

Genus

Parascyphus

Loc

Parascyphus repens (Jäderholm, 1904)

Galea, Horia R. 2007
2007
Loc

Parascyphus repens: Vervoort, 1972a: 95

El Beshbeeshy, M. 1991: 137
Stepanjants, S. D. 1979: 61
Leloup, E. 1974: 25
Vervoort, W. 1972: 95
1972
Loc

Thyroscyphus repens Jäderholm, 1904b: 8

Jaderholm, E. 1905: 19
Jaderholm, E. 1904: 8
1904