Silicularia

Galea, Horia R., Schories, Dirk, Försterra, Günter & Häussermann, Verena, 2014, New species and new records of hydroids (Cnidaria: Hydrozoa) from Chile, Zootaxa 3852 (1), pp. 1-50 : 8-10

publication ID

https://doi.org/ 10.11646/zootaxa.3852.1.1

publication LSID

lsid:zoobank.org:pub:7DE3BCBA-E5F0-4F0D-B2FD-B5B59E4DAE51

DOI

https://doi.org/10.5281/zenodo.6143161

persistent identifier

https://treatment.plazi.org/id/03D92A2C-476F-FFD1-FF51-82D25B7AA684

treatment provided by

Plazi

scientific name

Silicularia
status

 

Silicularia View in CoL ? bilabiata ( Coughtrey, 1875)

( Fig. 1 View FIGURE 1. A, B K, L, Table 2 View TABLE 2 )

Campanularia bilabiata Coughtrey, 1875: 291 View in CoL , pl. 20 Figs 46–49.

Silicularia rosea View in CoL ― Galea et al., 2009: 18 View Cited Treatment , Fig. 4 View FIGURE 4. A ‒ F, M G–M (not S. rosea Meyen, 1834 View in CoL ).

Material examined. Corral, Chaihuin/Huiro, lat. -39.95000, long. -73.61667, 30.xi.2011, 8‒ 10 m, sample 58: small colony with immature, most probably female gonothecae. HF6, “Inio 5”, lat. -43.40000, long. -74.08333, 24.ii.2008, 8 m, sample A504: colony with incompletely formed female gonothecae, on seaweed (MHNG-INVE- 62833).

Remarks. A small colony (sample 58) with immature (likely female) gonothecae occurs in the present collection and corresponds in every respect to the material assigned earlier ( Galea et al. 2009, MHNG-INVE- 62833) to S. rosea Meyen, 1834 . Both specimens exhibit laterally flattened hydrothecae with equally developed walls, and their gonothecae are comparatively wider with respect to those in the material described below, that we are now assigning to Meyen’s species. In spite of the opinion expressed by Vervoort & Watson (2003, p. 444), stating that “there are no reliable characters that separate Silicularia rosea Meyen, 1834 from Campanularia bilabiata Coughtrey, 1875 ”, the peculiar position of the hydrothecal rim (compare Fig. 1 View FIGURE 1. A, B K with 1M) and the comparatively broader gonothecae (compare Fig. 1 View FIGURE 1. A, B L to 1N; see Table 2 View TABLE 2 ) set the present material apart from the typical concept of S. rosea , as illustrated through the redescription of the type by Hartlaub (1905, p. 573, Fig. T1).

However, owing to the scarcity of specimens in hand, it is impossible to ascertain the degree of morphological variation of the hydrotheca, especially regarding the position of its aperture. Though all specimens inspected had the plane of the aperture perpendicular to the long axis of the theca, thus resembling to the original illustration provided by Coughtrey (1875, Pl. 20 Fig. 46), it was already shown ( Hilgendorf 1898, Bale 1924) that it may be inclined to one side, exactly as in S. rosea . Since the present identification is provisional and not intended to clarify the taxonomy of this nominal species at this stage, it should be taken with care, pending the re-examination of the syntype of Campanularia bilabiata designated by Ralph (1956, p. 287).

The relationships between S. bilabiata and both Eucopella campanularia von Lendenfeld, 1883 and E. reticulata Hartlaub, 1905 , all provided with broad, ovate, laterally flattened gonothecae, are unclear at present. Distribution in Chile. South of Chiloé ( Galea et al. 2009), and Corral (present study).

World records. The lack of knowledge on the specific limitation of S. bilabiata prevents us from establishing an exhaustive list of distributional records.

TABLE 2. Comparison of species of Silicularia Meyen, 1834; dimensions are given in µm.

  S. bilabiata (Coughtrey, 1875) S. rosea Meyen, 1834 S. hemisphaerica (Allman, 1888)
Reference Present study, as S. bilabiata Present study, as S. Blanco (1967b), as rosea S. bilabiata Galea (2010b), as S. Markannerrosea; present study Turneretscher (1890), as H.atlantica
Pedicel      
- length 725–4335 ≤ 8000 331–8000 ≤ 5500 1000–5000
- diameter 170–240 150–270 147–276 100–175 180
Hydrotheca      
- length lowered wall 635–970 535–680 736–993 330–450 350
- length raised wall 635–970 720–900 828–1159 540–640 660
- height basal chamber 135–365 280–415 – 215–265 –
- diameter at aperture 500–700 770–925 699–828 480–550 300–630
♀ Gonotheca      
- length 1560–1845 ≤ 4000 3128–3827 ≤ 2500 2700
- max. width 1105–1170 730–855 644–883 575–685 670
- diameter at aperture 645–805 552–828 295–425 –
♂ Gonotheca      
- length ≤ 5000 2024–4340 ≤ 2000 1700
- max. width 550–695 239–570 250–305 250

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Leptothecata

Family

Campanulariidae

Loc

Silicularia

Galea, Horia R., Schories, Dirk, Försterra, Günter & Häussermann, Verena 2014
2014
Loc

Silicularia rosea

Galea 2009: 18
2009
Loc

Campanularia bilabiata

Coughtrey 1875: 291
1875
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