Scandia gigas ( Pieper, 1884 )

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: 24-25

publication ID

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

publication LSID

lsid:zoobank.org:pub:4D98B605-5424-4A9A-AE3D-E38F2F96D1D6

persistent identifier

http://treatment.plazi.org/id/038A8789-FFFE-C159-FF1E-77DD23987B3D

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Plazi

scientific name

Scandia gigas ( Pieper, 1884 )
status

 

Scandia gigas ( Pieper, 1884) 

(fig. 5 A –C, table 8)

Lafoea gigas Pieper, 1884: 165  .

Scandia gigas  — Boero, 1981: 190, fig. 6.— Gili, 1986: 171, fig. 4.27 B –C.— Altuna Prados, 1994: 158, pl. 23 figs A –E.— Peña Cantero & García Carrascosa, 2002: 59, fig. 11 E –G.

Lafoea pocillum Hincks, 1868: 204  , pl. 40 fig. 2.— Patriti, 1970: 27, fig. 27.

Campanularia  (?) mutabilis  — Broch, 1913: 10, fig. 13 [not Scandia mutabilis ( Ritchie, 1907)  ].

Laomedea  michael-sarsi Leloup, 1935: 22, fig. 9.

Scandia  michael-sarsi — García Corrales et al., 1979: 20, fig. 9.

Scandia michaelsarsi  — Boero et al., 1997: 31.

Hebella  michael-sarsi — Vervoort, 1959: 242, fig. 16.

Hebellopsis michaelsarsi  — Calder et al., 2003: 1188, fig. 10.

Material examined. Stn. 2: 22.01.2008 —a few hydrothecae, but no gonothecae, on algae. Stn. 7: 25.03. 2008 —two hydrothecae, but no gonothecae, on gree alga; 27.03.2008 —a colony with male gonothecae, on Dictyota  sp. and calcareous alga.

Type locality. Eastern coast of the Adriatic Sea.

Description. Colonies exclusively stolonal, with individual hydrothecae and gonothecae arising from creeping stolon. Hydrothecal pedicels of variable length, perisarc undulated to spirally grooved. Hydrothecae tubular, elongated, walls nearly parallel, perisarc smooth; narrowing towards base and merging imperceptibly into pedicel; margin distinctly everted, aperture circular, rim even; a thick diaphragm basally. Hydranths with 16–20 filiform tentacles. Male gonothecae elongated-ovoid, borne on short, undulated pedicel; gonophore, fixed sporosac, containing a homogenous mass of tissue around blastostyle; large nematocysts present in tissues. Female gonothecae not seen. Nematocysts (undischarged): small capsules (6.8–7.4) × (1.8–2.1) µm; medium-sized capsules (8.4–9.1) × (2.6–3.1) µm; large capsules (18.6–20.3) × (6.3–6.8) µm.

Remarks. The trophosome of Scandia michaelsarsi ( Leloup, 1935)  appears morphologically indistinguishable from that of S. gigas  , based on descriptions and illustrations from the literature ( Leloup 1935, Vervoort 1959, García Corrales et al. 1979, Calder et al. 2003). However, all of the records attributable to Leloup’s (1935) species were based on sterile material, and therefore no comparison could be made with the gonosome of S. gigas  . The above-cited authors did not make any connection between the two species and considered S. michaelsarsi  as valid, while others ( Altuna Prados 1994, Peña Cantero & García Carrascosa 2002) included at least the eastern Atlantic records of S. michaelsarsi  in the synonymy of Pieper’s (1884) species. However, Leloup (1935) considered the material described by Broch (1913) as Campanularia  (?) mutabilis Ritchie, 1907  from Cape Bojador (eastern Atlantic) as being conspecific with his new Laomedea michaelsarsi  from the Dry Tortugas (western Atlantic), suggesting the occurrence of his species on both sides of the Atlantic.

Moreover, Boero et al. (1997) examined the syntype material of Leloup’s species and found it similar with S. gigas  , especially in the presence of a true diaphragm at the hydrothecal base. In addition to the close morphological similarities illustrated in various accounts from the literature, a comparison of measurements for several representative records of both S. gigas  and S. michaelsarsi  was established (table 8). It appears that only little variation in size could be noticed, which proves that they are undoubtedly conspecific.

The present, fertile material from the Lesser Antilles is solid evidence of the occurrence of S. gigas  in the western Atlantic, although its presence was previously questionable (see Peña Cantero & García Carrascosa 2002). However, some if not all of Fraser’s (1944) records of Hebella  (?) pocillum ( Hincks, 1868)  from boreal waters are more likely based on hydroids of Lafoea dumosa ( Fleming, 1828)  , according to Cairns et al. (2002).

TABLE 8. Measurements of Scandia gigas ( Pieper, 1884)  , in µm.(1)Microslide preparation, Mediterranean material from La Ciotat, France. (2)Approximate dimensions calculated from fig. 6 A & C. (3)Approximate dimensions calculated from fig. 11 E & G.

Scandia gigas ( Pieper, 1884)  Scandia michaelsarsi ( Leloup, 1935)  Distribution. Mainly known from the Mediterranean, but also reported from both the Lusitanian and Mauritanian Atlantic provinces ( Peña Cantero & García Carrascosa 2002). Occurs additionally in the tropical western Atlantic ( Leloup 1935, present study), and the Galapagos ( Calder et al. 2003).

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Leptothecata

Family

Hebellidae

Genus

Scandia

Loc

Scandia gigas ( Pieper, 1884 )

Galea, Horia R. 2008
2008
Loc

Hebellopsis michaelsarsi

Calder 2003: 1188
2003
Loc

Scandia michaelsarsi

Boero 1997: 31
1997
Loc

Scandia gigas

Pena 2002: 59
Altuna 1994: 158
Gili 1986: 171
Boero 1981: 190
1981
Loc

Scandia

Garcia 1979: 20
1979
Loc

Lafoea pocillum

Patriti 1970: 27
Hincks 1868: 204
1970
Loc

Hebella

Vervoort 1959: 242
1959
Loc

Laomedea

Leloup 1935: 22
1935
Loc

Campanularia

Broch 1913: 10
1913
Loc

Lafoea gigas

Pieper 1884: 165