Haliclona (Reniera) juckdoensis, Kim & Kang, 2020

Kim, Hyung June & Kang, Dong Won, 2020, Two New Species of the Genus Haliclona from Korea, Zootaxa 4890 (2), pp. 289-295 : 291-294

Haliclona (Reniera) juckdoensis sp. nov.

( Fig. 3 A–F, Table 3 )

Material examined. Korea, Gyeongsangbuk-do, Ulleung-gun, Ulleung-up, Juck-do , MAY 17, 2017, SCUBA, 18 m depth, coll. Kim H.S, MABIK IV00168258 .

Description. Shape ( Fig. 3A ): Sprawling masses of conical tube with fairly thin rims, tubes 1–2 cm, 1.5 cm in thickness and 5–6 cm in width.

Colour: Ivory in life which gradually changes to beige in alcohol.

Oscula : 0.7–1cm in diameter, open at top of tube.

Texture: Soft, fragile, compressible.

Surface: Smooth, even.

Skeleton ( Fig. 3 C–F): Ectosomal skeleton, a regular tangential, reticulation of single spicules, bound at the nodes by a small amount of sponging. Choanosomal skeleton, isotropic to ladder-like reticulation by unispicular primary lines regularly connected by unispicular secondary lines.

Spicules ( Fig. 3B ): Two sizes of oxea, no microscleres. Thick oxea 180–210 × 10–12.5 μm in size. Thin oxea 130–160 × 2–5 μm in size.

Distribution. Only found in the Ulleung-do Island, Juck do at depth of 18 m.

Etymology. Named after from the locality, Juck-do, Korea.

Remarks. H. (R.) juckdoensis sp. nov. is allocated in the subgenus by having choanosomal skeleton of regular, unispicular, isotropic reticulation. Spongin has always present at the nodes of spicules. This new species differs from other Haliclona (Reniera) in having two size categories of oxea. We compared our new species with Haliclona (Reniera) species in the northwestern part of the Indo-Pacific regions. H. (R.) juckdoensis sp. nov. differs from all other Haliclona (Reniera) species from Japan based on spicule composition ( Table 3 ). Species recorded by Hoshino were not comparable due to differences in skeletal structure. The species that Hoshino announces are all bundles of primary skeletons, which require reconfirmation of Subgenus. Therefore, it is necessary to review the species of subgenus. So, we compared our species to other species in Korea in Table 1.

The most similar species to H. (R.) juckdoensis sp. nov. is H. (R.) hongdoensis Kang & Sim, 2007 . However, it differs from the latter by having one categories of oxea, while H. (R.) juckdoensis sp. nov. have two size category of oxea ( Table 4).

References: (1) Hoshino, 1981

Figures

FIGURE 3. Haliclona (Reniera) juckdoensis sp. nov.: (A) Image of the holotype specimen, (B) Spicules, a, Large oxea, b, Small oxea, (C, D) Ectosomal skeletal, (E, F) Choanosomal skeletal.

Tables

TABLE 3. Records and measurements of spicules for specimens of the subgenus Haliclona (Reniera) Schmidt, 1862 from Japan. Values measured in Ẉ, expressed as smallest-largest spicules length / width.

Specimen	Oxeas		Other spicule
	Thick	Thin
H. (R.) juckdoensis sp. nov.	180–210 × 10–12.5	130–160 × 2–5
H. (R.) aquaeductus (Suhmidt, 1862) 1	135–165 ×5–9	–
H. enormismacula Hoshino , 19811	140–155 ×8–11	110–130 ×3–4
H. frondosa Hoshino , 19811	165–178 ×10–13	118–165 ×3–7
H. surrufa Hoshino , 19811	130–205 × 2–6	–
H. (Soestella) implexa (Schmidt, 1868) 1	110–130 ×4–7	–