Acryptolaria gemini, Peña Cantero & Vervoort, 2010

Peña Cantero, Álvaro L. & Vervoort, Willem, 2010, Species of Acryptolaria Norman, 1875 (Cnidaria, Hydrozoa, Lafoeidae) collected in the Western Pacific by various French expeditions, with the description of nineteen new species, Zoosystema 32 (2), pp. 267-332 : 290-291

publication ID

https://doi.org/ 10.5252/z2010n2a5

DOI

https://doi.org/10.5281/zenodo.4551868

persistent identifier

https://treatment.plazi.org/id/03E5636A-FF8B-FFBC-FCD1-54757695F92E

treatment provided by

Felipe

scientific name

Acryptolaria gemini
status

sp. nov.

Acryptolaria gemini View in CoL n. sp.

( Figs 10 View FIG ; 30 View FIG ; 31G View FIG ; Table 11)

TYPE MATERIAL. — Vanuatu. Gemini Seamount , GEMINI, stn DW 60, 20°59.9’S, 170°16.6’E, 190 m, 6.VII.1989 1 broken stem c. 45 mm high, holotype (MNHN- Hy.2009-0161) GoogleMaps ; 1 stem and several fragments, paratype (RMNH-Coel. no. 31511).

ETYMOLOGY. — The specific name “ gemini ” has been taken from the locality, the Gemini Seamount; it is a noun in apposition.

ECOLOGY AND DISTRIBUTION. — Acryptolaria gemini n. sp. was collected at a depth of 190 m in the remote Gemini Seamounts area (20°59.9’S, 170°16.6’E).

DESCRIPTION OF THE HOLOTYPE

Stem c. 45 mm high, broken into three main stem fragments. Hydrorhiza dish-shaped. Branching frequent and irregular, more or less in one plane, though secondary branches may arise in several planes ( Fig. 31G View FIG ). The stem gives rise to several primary branches,some of which get much developed and form a few second-order branches; secondary branches quite distal. Branches approximately straight ( Fig. 10A, B View FIG ).

Hydrothecae alternately arranged and roughly in one plane ( Fig. 10A, B View FIG ). Hydrotheca horn-shaped ( Fig.10 View FIG ); diameter progressively decreasing from aperture, where it is maximal, to base, but with a sharp reduction at the point where the hydrotheca becomes adnate. Hydrotheca sharply directed outwards; adcauline wall free for more than half its length (adnate/ free ratio 0.8). Free portion of adcauline wall slightly convex, adnate part roughly straight. Abcauline wall concave in general, but straight at basal and distal parts.Hydrothecal aperture circular,directed upwards, forming an angle of c. 40° with longitudinal axis of branch. Rim even, usually with renovations.

Large nematocysts relatively small and fusiform ( Fig. 30 View FIG ).

Coppinia not observed.

REMARKS

Acryptolaria gemini n. sp. closely resembles A. longitheca (Allman, 1877) . The similarities and differences will be discussed below, when dealing with the latter.

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Leptothecata

Family

Lafoeidae

Genus

Acryptolaria

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