Acryptolaria minima Totton, 1930

Peña Cantero, Alvaro L., Marques, Antonio C. & Migotto, Alvaro E., 2007, Revision of the genus Acryptolaria Norman, 1875 (Cnidaria, Hydrozoa, Lafoeidae), Journal of Natural History 41 (5 - 8), pp. 229-291 : 254-256

publication ID

https://doi.org/ 10.1080/00222930701228132

persistent identifier

https://treatment.plazi.org/id/AC456037-600B-6252-FE11-FA778F906CB6

treatment provided by

Carolina

scientific name

Acryptolaria minima Totton, 1930
status

 

Acryptolaria minima Totton, 1930

( Figures 10 View Figure 10 , 16B View Figure 16 , 18C View Figure 18 , 19B, D View Figure 19 ; Table X) Acryptolaria minima Totton 1930, p 162 –163, Figure 18a, b View Figure 18 ; Ralph 1958, p 315, Figure 3e, f View Figure 3 .

Material examined

Holotype: BMNH 1929.10 .10.3, Terra Noυa Expedition , Sta. 134, near North Cape, New Zealand, alcohol, fertile specimen 9 cm in height, 11–20 fathoms (19.8–36 m).

Description

Palmate colony, ca 90 mm in height, composed of two main stems, one of them basally giving rise to a conspicuous secondary stem. Stems strongly branched, giving rise to numerous lower-order branches (up to fourth order). Stems almost completely polysiphonic, branches polysiphonic up to distalmost ends, though in most distal parts usually as a single tube. Colonies alternately branched in one plane, though sometimes branches arising either in decussate pairs or alternately in several planes. Branches frequently anastomosed.

Hydrothecae alternate, in one plane. Hydrotheca tubular, almost completely cylindrical; diameter slightly decreasing at basal part. Hydrotheca gently curved abcaulinarly, adcauline wall approximately four-fifths adnate to internode. Adcauline wall convex; abcauline wall mostly concave, but slightly convex at basal part. Hydrothecal aperture circular, directed upwards, forming an angle of 40–60 ° with long axis of branches. Rim even, usually one to two renovations in most distal hydrothecae; renovations more numerous at basal and polysiphonic parts.

Coppinia 13–20 mm long and ca 3 mm in diameter. Gonothecae closely aggregated, pyriform, with a circular distal aperture. Coppinia without defensive tubes.

Remarks

Acryptolaria minima is well characterized by the shape and size of the hydrothecae. In fact, it is the species with the smallest hydrothecae amongst the known species of Acryptolaria (cf. Table XV). By contrast, apart from A. tortugasensis (see below), it has the largest nematocysts. Acryptolaria minima is also characterized by having hydrothecae almost completely adnate to the branches (only one-fifth of the adcauline wall is free). The wellmarked characters make it possible to corroborate some of the identifications made in the literature, such as that of Ralph (1958) for a specimen from Cook Strait, New Zealand.

Distribution

Acryptolaria minima seems to be a shelf species, having been found at depths between 20 ( Totton 1930) and 180 m ( Ralph 1958). Presently, it is known only from New Zealand waters, where it has been reported from off Cape North and Cape Maria van Diemen ( Totton 1930) and from Cook Strait ( Ralph 1958).

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Leptothecata

Family

Lafoeidae

Genus

Acryptolaria

Loc

Acryptolaria minima Totton, 1930

Peña Cantero, Alvaro L., Marques, Antonio C. & Migotto, Alvaro E. 2007
2007
Loc

Acryptolaria minima

Totton 1930
1930