Acryptolaria undulata, 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 : 323-324

publication ID

https://doi.org/ 10.5252/z2010n2a5

DOI

https://doi.org/10.5281/zenodo.4551950

persistent identifier

https://treatment.plazi.org/id/03E5636A-FFA4-FF9D-FF11-52487529F92E

treatment provided by

Felipe

scientific name

Acryptolaria undulata
status

sp. nov.

Acryptolaria undulata View in CoL n. sp.

( Figs 29 View FIG ; 30 View FIG ; 32L View FIG ; Table 30)

TYPE MATERIAL. — Norfolk Ridge. BIOCAL 1, stn DW 66, 24°55.435’- 24°54.849’S, 168°21.678’- 168°21.995’E, 515- 505 m, 3.IX.1985, 1 stem 10 mm high, holotype (MNHN-Hy.2009-0175) GoogleMaps ; 1 stem 12 mm high, paratype (RMNH-Coel. no. 31530); 1 stem 8 mm high, paratype ( MNCN 2.03 About MNCN /435) .

OTHER MATERIAL EXAMINED. — Norfolk Ridge. BIOCAL 1, stn CP 67, 24°55.443’- 24°54.176’S, 168°21.550’- 168°21.978’E, 500-510 m, 3.IX.1985, 1 fragment c. 20 mm long (RMNH-Coel. no. 35239, slide no. 826).

ETYMOLOGY. — The specific name undulata refers to the wavy form of the hydrotheca; it is an adjective, from the verb “undo” = to undulate, following the (female) genus name in declension.

ECOLOGY AND DISTRIBUTION. — Acryptolaria undulata n. sp. was collected at a depth of 500-515 m in the Norfolk Ridge area.

DESCRIPTION

Unbranched stems up to 20 mm high. Stems almost straight, forming a scarcely noticiable zigzag ( Fig. 32L View FIG ; Fig. 29A View FIG ).

Hydrothecae in approximately one plane ( Fig. 29A View FIG ), undulating with a triple curvature ( Fig. 29 View FIG ): first strongly curved outwards, then markedly bent upwards and, finally, slightly curved outwards again; hydrotheca consequently with a distinct abcauline hump. Hydrothecal diameter approximately homogeneous throughout, but decreasing basally.Moreover, the hydrotheca is slightly narrowed at the point where it becomes free and widens towards the aperture; it is adnate for less than half its adcauline length (adnate/free ratio 0.8). It has many short renovations (up to 20); the hydrothecal rim is flaring.

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

Coppinia not found.

REMARKS

Acryptolaria undulata n. sp. is unique by the shape of the hydrothecae and therefore easily recognizable. Furthermore, its nematocysts are amongst the largest known. The material from BIOCAL 1 stn CP 67 has a stolon distally, indicating the possibility to anastomose.

As stated above, Acryptolaria undulata n. sp. is undoubtedly allied to A. pseudoundulata n. sp. Even their nematocysts are of the same size. However, A. pseudoundulata n. sp. is a more robust species, with distinctly wider but shorter hydrothecae (cf. Table 31). Moreover, they differ in the shape of the hydrotheca since these are curved twice in A. pseudoundulata n. sp., instead of three times as it occurs in A. undulata n. sp. Also, whereas the diameter of the hydrothecae is clearly smaller at the aperture than at the diverging point in A. pseudoundulata n. sp., contrary conditions are found in A. undulata n. sp.

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Leptothecata

Family

Lafoeidae

Genus

Acryptolaria

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