Thyroscyphus marginatus ( Allman, 1877 )

Calder, Dale R., 2013, Some shallow-water hydroids (Cnidaria: Hydrozoa) from the central east coast of Florida, USA, Zootaxa 3648 (1), pp. 1-72: 23-24

publication ID

http://dx.doi.org/10.11646/zootaxa.3648.1.1

publication LSID

lsid:zoobank.org:pub:22089255-436A-4DBB-BD93-1D3C8CF281FE

DOI

http://doi.org/10.5281/zenodo.5263368

persistent identifier

http://treatment.plazi.org/id/039B197E-FFC9-F553-E6F9-F9EDFAE91755

treatment provided by

Felipe

scientific name

Thyroscyphus marginatus ( Allman, 1877 )
status

 

Thyroscyphus marginatus ( Allman, 1877)  

Fig. 7c, d View FIGURE 7

Obelia marginata Allman, 1877: 9   , pl. 6, figs. 1, 2.

Thyroscyphus marginatus   .— Cummings, 1994: 1208.— Jones, 2002: 218.

Type locality. USA: Florida, off Loggerhead Key ( Allman 1877)   .

Voucher material. Bethel Shoal off Vero Beach, 27°42.6’N, 80°06.8’W, 24 m, 18.ii.1976, Johnson-Sea-Link, JSL 328, diver lockout, one colony fragment, 3 cm high, without gonothecae, coll. S. Nelson, ROMIZ B3963 GoogleMaps   .

Remarks. Thyroscyphus marginatus ( Allman, 1877)   is a conspicuous species, forming large colonies that reach as much as nine inches (23 cm) high ( Allman 1877). It is easily distinguished from the sympatric T. ramosus Allman, 1877   in having an entire (non-cuspate) rather than a four-cusped hydrothecal margin, and a single operculum that is shed rather than a persistent one of four valves.

In some earlier papers ( Calder 1993, 1998, 2000; Calder & Kirkendale 2005; Calder & Cairns 2009) I assigned this species to Cnidoscyphus Splettstösser, 1929   , a genus originally established with three included species ( Laomedea torresii Busk, 1852   ; Obelia marginata Allman, 1877   ; and Thyroscyphus aequalis Warren, 1908   ). No type species was designated for it until Vervoort (1993: 104) chose L. torresii Busk, 1852   as the name-bearing type. Cnidoscyphus   was founded on an invalid character (presence of large nematocysts in the mantle lining of the hydrotheca, now known in several thyroscyphid and sertulariid genera) and it is currently regarded as a junior synonym of Thyroscyphus Allman, 1877   ( Bouillon et al. 2006).

This hydroid species is widely reported in the tropical western Atlantic (see records in Fraser 1944, as Campanularia marginata   ; Vervoort 1968, as Cnidoscyphus marginatus   ; Calder & Kirkendale 2005, as C. marginatus   ; Galea 2008; Castellanos Iglesias et al. 2011). It extends northwards into shelf waters of the southeastern United States ( Cain 1972, as C. marginatus   ; Wenner et al. 1983, 1984; Cummings 1994) and Gulf of Mexico ( Calder & Cairns 2009, as C. marginatus   ), but is infrequent in estuaries of the region ( Calder 1983).

Reported distribution. Atlantic coast of Florida. Boca Raton ( Cummings 1994).—Biscayne Bay ( Jones 2002).

Western Atlantic. North Carolina ( Cain 1972, as Cnidoscyphus marginatus   ) to Brazil (Oliveira et al. submitted), including Bermuda ( Calder 1991a), the Gulf of Mexico ( Calder & Cairns 2009, as C. marginatus   ), and the Caribbean Sea ( Galea 2008).

Elsewhere. Eastern Atlantic ( Vervoort 1959, as C. marginatus   ; Medel & Vervoort 1998, as C. marginatus   ).

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Leptothecata

Family

Thyroscyphidae

Genus

Thyroscyphus

Loc

Thyroscyphus marginatus ( Allman, 1877 )

Calder, Dale R. 2013
2013
Loc

Thyroscyphus marginatus

Jones, T. 2002: 218
Cummings, S. L. 1994: 1208
1994
Loc

Obelia marginata

Allman, G. J. 1877: 9
1877