Antomma elegans (Fraser, 1937) Galea & Di Camillo & Maggioni, 2021

Galea, Horia R., Di Camillo, Cristina G. & Maggioni, Davide, 2021, An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana, Zootaxa 4926 (3), pp. 301-341 : 333

publication ID

https://doi.org/10.11646/zootaxa.4926.3.1

publication LSID

lsid:zoobank.org:pub:72A46F33-C094-4DEB-BD58-408749AA3155

DOI

https://doi.org/10.5281/zenodo.4545889

persistent identifier

https://treatment.plazi.org/id/45376A35-3277-B061-FF7C-FF51217DFCE1

treatment provided by

Plazi

scientific name

Antomma elegans (Fraser, 1937)
status

comb. nov.

Antomma elegans (Fraser, 1937) , comb. nov.

Fig. A4 View FIGURE 4

Hippurella elegans Fraser, 1937: 5 , pl. 2 fig. 9.—Fraser, 1944: 332, pl. 71 fig. 321.

Description. Colonies up to 35 cm high, with fascicled stems, whose lower half is devoid of branches and hydrocladia; upper half bearing long, slender branches, given off either singly or, commonly, in nearly opposite pairs; branches arising in all direction around the stem; stem and branches with indistinct divisions; equivalents of internodes with a proximal nematotheca, a latero-distal cladial apophysis with 2 nematothecae, as well as an additional nematotheca below; cladia given off at an angle of ca. 60°, arranged regularly alternately along the branches; homomerously (?) divided into long internodes, each with a proximal hydrotheca and its complement of 3 nematothecae (one mesial and a couple of laterals), as well as a distal nematotheca, above the hydrotheca; hydrothecae deep, tubular, abaxial walls slightly sinuated, margins entire; gonosome on distal portions of some branches; composed of staked whorls of up to 8 rows of 6 slender, distally tapering, unbranched, nematothecate ramuli, curving out- and upward from the common rachis; gonothecae elliptical, smooth-walled, borne singly or in pairs on the axils of ramuli.

Remarks. Antomma elegans was distinguished from A. longicarpa through the “hydrocladial internodes without septa” (Fraser 1944) and, consequently, its relationships to the latter remain obscure, pending the reexamination of the type, Fraser’s illustrations being qualitatively poor to sufficiently highlight its specific differences.

Distribution. Off Puerto Rico (18°31’30’’ N, 66°18’20’’ W, depth not recorded; 18°24’45’’ N, 67°14’15’’ W, 146–329 m; 18°13’15’’ N, 65°56’45’’ W, 439 m) (Fraser 1937).

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Leptothecata

Family

Plumulariidae

Genus

Antomma

Loc

Antomma elegans (Fraser, 1937)

Galea, Horia R., Di Camillo, Cristina G. & Maggioni, Davide 2021
2021
Loc

Hippurella elegans

Fraser 1937: 5
1937