Eudendrium deforme Hartlaub, 1905

Watson, Jeanette W., 2003, Deep-water hydroids (Hydrozoa: Leptolida) from Macquarie Island, Memoirs of Museum Victoria 60 (2), pp. 151-180 : 153-154

publication ID

https://doi.org/ 10.24199/j.mmv.2003.60.18

persistent identifier

https://treatment.plazi.org/id/039F8846-FFD1-FF85-2B4D-F9A0FD6BFAF4

treatment provided by

Felipe

scientific name

Eudendrium deforme Hartlaub
status

 

Eudendrium deforme Hartlaub View in CoL

Figures 3A–D View Figures 3

Eudendrium deforme Hartlaub, 1905: 508 View in CoL , 514, 552, figs B', C'.—

Bedot, 1925: 184.

Material examined. Stn 44, NMV F91308, many sparsely fertile colonies on dead stem of a primnoid gorgonian, colonies intergrown and entangled with Tulpa diverticula , sertularian and Eudendrium colonies, specimen alcohol-preserved. Stn 46, TM K2770, many colonies on dead stem of primnoid gorgonian, specimen alcohol-preserved.

Description. Colonies comprising many tangled stems up to 70 mm long and 0.3–0.4 mm diameter arising from a hydrorhiza entwining stem of host. Stems more or less straight to curved, monophonic, with 5–10 strong basal annulations and groups of annulations at intervals along stems.

Stems sparsely, alternately, but irregularly branched, more or less in one plane, occasionally secondary branching occurs; branchlets (pedicels) more or less alternate, spaced well apart, short to moderately long, beginning with up to 10 deep annulations; stems sometimes annulated throughout; perisarc otherwise smooth. A few hydranths in poor condition remain on colonies; hydranth large, with c. 24 tentacles. Perisarc of lower stems thick and smooth, thinning distally along smaller branches and pedicels.

Nematocysts all undischarged euryteles of one size: small, droplet-shaped, a few in coenosarc of stems and tentacles of hydranth, capsule 10 X 6 µm.

Male gonophores present on several colonies; clustered on short, smooth to corrugated pedicels near base of stems; up to 5 in a beaded chain, apical gonophore single, gonophores below paired; tentacles of hydranth partially resorbed and reduced in number, hypostome intact.

Colour. Lower stem shining in dark brown, fading distally to pale yellowish; gonophores white.

Distribution. Calbuco, Chile; Mar del Plata, Argentina ( Hartlaub, 1905).

Remarks. Due to entanglement of the stems it is difficult to decide if one or many colonies are present. The few hydranths are in very poor condition, due either to damage during collection or senescence of the colony. The species is distinguished by its strictly monosiphonic, shining brown stems and paired chain of immature gonophores.

Although Hartlaub’s description of the species is brief I have no doubt that the present specimens are referrable to Eudendrium deforme . Like much of the present material, Hartlaub’s specimens apparently comprised bare stems lacking hydranths or reproductive structures. The thin brown stems, as described and figured by Hartlaub are characteristic. The species has not been recorded since its first description.

NMV

Museum Victoria

TM

Teylers Museum, Paleontologische

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Anthoathecata

Family

Eudendriidae

Genus

Eudendrium

Loc

Eudendrium deforme Hartlaub

Watson, Jeanette W. 2003
2003
Loc

Eudendrium deforme

Hartlaub, C. 1905: 508
1905
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