Acryptolaria corniformis Naumov and Stepanjants, 1962,

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: 243-245

publication ID

http://doi.org/ 10.1080/00222930701228132

persistent identifier

http://treatment.plazi.org/id/AC456037-6000-625D-FE8B-FDE08C2D6A04

treatment provided by

Carolina

scientific name

Acryptolaria corniformis Naumov and Stepanjants, 1962
status

 

Acryptolaria corniformis Naumov and Stepanjants, 1962 

( Figures 5View Figure 5, 15CView Figure 15, 17DView Figure 17; Table V)

Acryptolaria corniformis Naumov and Stepanjants 1962, p 74  , Figure 2View Figure 2; Stepanjants 1979, p 51, Plate 9 Figures 1–3View Figure 1View Figure 2View Figure 3.

Material examined

Holotype: ZIRAS 1 /10322, Ob Sta. 44A, 65 ° 509030 S, 128 ° 279 E, 18 March 1956, 320 m, silty sand, one distal stem fragment ca 20 mm long, without coppinia (in slide). 

Description

‘‘A small fragment of a colony (2 cm long) with polysiphonic caulus and alternative ramifications’’ ( Naumov and Stepanjants 1962, p 73). Branches in a slight zigzag.

Hydrothecae alternately arranged in approximately one plane. Hydrotheca horn-shaped, diameter gradually decreasing from aperture to basal part. Hydrotheca slightly curved abcaulinarly; basal half to two-thirds of adcauline wall adnate to internode. Adcauline wall slightly convex; abcauline wall slightly concave. Hydrothecal aperture circular, strongly directed upwards, forming an angle of ca 35 ° with longitudinal axis of branch. Rim even, sometimes with few short renovations.

Coppinia not observed.

Remarks

The material available consists of a microslide preparation; nematocysts are extremely difficult to find. However, putative nematocysts were seen.

Naumov and Stepanjants (1962) indicated that A. corniformis  is allied with A. crassicaulis  , being different in the larger dimensions of the hydrothecae and the greater length of the free adcauline part in A. corniformis  . Stepanjants (1979) again pointed out the similarity between A. corniformis  and A. crassicaulis  , but differentiated both species by the smaller hydrothecae, more curved longitudinal axis, and less pronounced difference between the diameters of the aperture and basal part in A. crassicaulis  . Gravier-Bonnet (1979), however, considered both species conspecific based on the habit of the colony and measurements. After examining the type material of both species, we consider that they constitute two valid, clearly distinguishable species (see below under the discussion of A. crassicaulis  ).

Distribution

Off Sabrina Coast ( Antarctica), 289 m depth (cf. Naumov and Stepanjants 1962; Stepanjants 1979).

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Leptothecata

Family

Lafoeidae

Genus

Acryptolaria

Loc

Acryptolaria corniformis Naumov and Stepanjants, 1962

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

Acryptolaria corniformis

Naumov and Stepanjants 1962: 74
1962