Adeonellopsis pentapora Canu & Bassler, 1929

Hirose, Masato, 2016, Diversity and distribution of adeonid bryozoans (Cheilostomata: Adeonidae) in Japanese waters, European Journal of Taxonomy 203 (203), pp. 1-41 : 17-19

publication ID

https://doi.org/ 10.5852/ejt.2016.203

publication LSID

lsid:zoobank.org:pub:325E4EF8-78F9-49D0-82AF-4C358B24F7F8

DOI

https://doi.org/10.5281/zenodo.3853225

persistent identifier

https://treatment.plazi.org/id/C55487F1-FFCB-FFB0-FD82-FAB5FE04F905

treatment provided by

Valdenar

scientific name

Adeonellopsis pentapora Canu & Bassler, 1929
status

 

Adeonellopsis pentapora Canu & Bassler, 1929 View in CoL

Fig. 11 View Fig

Adeonellopsis pentapora Canu & Bassler, 1929: 382 View in CoL , pl. 53, figs 1–5.

Adeonella tuberculata – Ortmann 1890: 53, pl. 4, figs 9a–b. — Okada 1923: 231. — Kataoka 1961: 264, pl. XXXVII, fig. 2.

Adeonellopsis pentapora View in CoL – Sakakura 1935: 115. — Kataoka 1961: 264, pl. XXXII, fig. 10.

Adeonellopsis yarraensis – Harmer 1957: 799, pl. LIII, figs 18–19 [in part]. — Hirose 2010: 52, pl. 89, figs A–D.

Material examined

JAPAN: colony in Döderlein Collection at MZS, from Sagami Bay, 1882 ( MZS 2-1, MZS 2-2; SEM specimen NSMT-Te748); colonies from east side of Sagami Bay and Sagami Sea, collected by NSMT (NSMT-TeS19, TeS20, TeS21, TeS22); specimens from off Ohakozaki, Otsuchi, 70–77 m depth (NSMT- Te761, Te762, Te765, Te766); Ariake Sea (NSMT-Te767, Te769); Wakasa Bay, Sea of Japan, 70–85.7 m depth (NSMT-Te800); off Shimoda (NSMT-Te892); near Yakushima and Tanegashima, 108–122 m depth (NSMT-Te763, Te764); off Iejima Island, 94–95 m depth (NSMT-Te801); Ogasawara, 136–141 m depth (NSMT-Te768).

Measurements

Autozooids. ZL: 337̅572 (434±54); ZW: 227̅367 (291±35); n = 34. SOrL: 42̅95 (58±10); SOrW: 65̅120 (89±13); n = 34. SAvL: 36̅84 (61±9); SAvW: 25̅51 (38±7); n = 36. SpL: 48̅153 (88±24); SpW: 43̅111 (75±18); n = 37.

Description

Colony yellow or white, small, fragile, dichotomously branching, almost two-dimensional ( Fig. 11 View Fig A– B); up to 3 cm high. Branches flat, slender, 1.3–2.6 mm wide (average 1.9 mm; n = 16). Autozooids on both sides of branches; oval or hexagonal, zooidal boundaries distinct, zooids delineated by groove and suture line ( Fig. 11E View Fig ). Frontal shield minutely granulate, with marginal pores; sometimes bearing 2 or 3 low, umbonate processes along lateral or proximal margin ( Fig. 11D View Fig ), 40–80 μm in diameter (average 60 μm, n = 14). Spiramen large, circular, divided into 4̅6 small denticulate pores ( Fig. 11D View Fig ). Peristome present, broadly oval in outline, not tubular ( Fig. 11C View Fig ); orifice indistinct in frontal view, proximal margin highly convex ( Fig. 11C View Fig ). One or two small suboral avicularia between orifice and spiramen ( Fig. 11E View Fig ); if single, positioned near midline and pointing distally or angled slightly distomedially or distolaterally; if paired, pointing distomedially; mandible short-triangular; crossbar incomplete. One to three frontal avicularia similar in size and shape to suboral avicularia situated around proximal and proximolateral margins of zooid ( Fig. 11D View Fig ). Basal part of colony consists of autozooids and kenozooids; 309–521 μm long (average 415 μm) by 202–383 μm wide (average 244 μm) (n = 14). Basal autozooids heavily secondarily calcified; peristome and spiramen depression confluent, forming single oblong depression that also contains the suboral avicularia ( Fig. 11F View Fig ), common opening 112–203 μm long (average 146 μm) by 66–108 μm wide (average 89 μm) (n = 10). Gonozooids lacking. Marginal vicarious avicularia not observed.

Remarks

Ortmann (1890) reported this species as Adeonella tuberculata ( Busk, 1884) from Sagami Bay based on Döderlein’s specimens, as it has two small avicularia between the orifice and spiramen. Adeonellopsis pentapora is quite small and fragile compared to the other adeonid species collected from Sagami Bay; it also occupies unstable substrates such as hydroid stems ( Fig. 11B View Fig ) and gastropod shells ( Fig. 11A View Fig ). Sakakura (1935) also reported a colony encrusting a gastropod shell from Toyama Bay. A colony of A. pentapora in the Döderlein collection is encrusted on a small shell of a dead gastropod inhabited by a hermit crab, and a colony collected from Sagami Bay in 2002 is encrusted on a different species of small shell of a dead gastropod. Canu & Bassler (1929) reported Adeonellopsis pentapora from a broad area of the Indo-Pacific, including Japan (Tsugaru Strait). Harmer (1957) considered Adeonellopsis pentapora and A. tuberculata to be junior synonyms of Adeonellopsis yarraensis (Waters, 1881) based on having two small suboral avicularia and narrow branches. A. yarraensis , however, is currently regarded as a strictly fossil species and A. tuberculata as a Recent species in Australia; therefore, I consider A. pentapora to be a valid species.

Distribution

Philippines and Japan: detected in this study from Sagami Bay, Sagami Sea, Korea Strait, Wakasa Bay, Toyama Bay, Otsuchi, Ariake Sea, near Tanega-shima and Yaku-shima, and Ogasawara, at depths of 29– 274 m. Adeonellopsis pentapora was not as abundant as other adeonid species in any collections or at any localities. Kataoka (1961) reported a fossil specimen from the Pleistocene Ryukyu Limestone of Kikai-jima, Kagoshima.

MZS

Universite de Strasbourg, Musee de Zoologie

NSMT

National Science Museum (Natural History)

Kingdom

Animalia

Phylum

Bryozoa

Class

Gymnolaemata

Order

Cheilostomatida

Family

Adeonidae

Genus

Adeonellopsis

Loc

Adeonellopsis pentapora Canu & Bassler, 1929

Hirose, Masato 2016
2016
Loc

Adeonellopsis yarraensis

Hirose M. 2010: 52
Harmer S. F. 1957: 799
1957
Loc

Adeonellopsis pentapora

Kataoka J. 1961: 264
Sakakura K. 1935: 115
1935
Loc

Adeonellopsis pentapora

Canu F. & Bassler R. S. 1929: 382
1929
Loc

Adeonella tuberculata

Kataoka J. 1961: 264
Okada Y. 1923: 231
Ortmann A. 1890: 53
1890
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