Adeonella jahanai, Hirose, 2016

Hirose, Masato, 2016, Diversity and distribution of adeonid bryozoans (Cheilostomata: Adeonidae) in Japanese waters, European Journal of Taxonomy 203 (203), pp. 1-41 : 29-30

Taxonomic key to Japanese adeonid species

1. Orifice circular; single peristomial spiramen proximal to orifice; no avicularia between orifice and spiramen; frontal shield with many small pores and several avicularia ……2 … Adeonella Busk, 1884

– Orifice oval; spiramen single or multiporous; single or paired avicularia between orifice and spiramen; frontal shield normally bearing only marginal pores …………3 … Adeonellopsis MacGillivray, 1886

2. Branch width reaches more than 3 mm; generally large vicarious avicularia present at branch bifurcations; generally more than two avicularia on frontal shield; areolar pores nearly uniform and circular; L/W ratio of frontal avicularia generally less than 2.0 ………………………………… …………………………………………………………… Adeonella cf. lichenoides ( Lamarck,1816)

– Branch width less than 2.5 mm; often lacking a large vicarious avicularium at branch bifurcations; generally single frontal avicularium on frontal shield; areolar pores irregular in shape and often slitlike; L/W ratio of frontal avicularia generally greater than 2.0 ………… Adeonella jahanai sp. nov.

3. Autozooidal spiramen small, 1-2 openings; openings not denticulate ……………………………4 – Autozooidal spiramen large, multiporous with more than four openings; openings denticulate ……6

4. Branches less than 2.0 mm wide; suboral avicularium abutting orifice, separate from spiramen, slightly curved, directed distolaterally …………… Adeonellopsis arculifera ( Canu & Bassler, 1929)

– Branches greater than 3.0 mm wide; suboral avicularium abutting spiramen, rostrum straight, directed laterally or distolaterally ……………………………………………………………………………5

5. Suboral avicularium large, rostral width equal to or greater than orifice width; rostrum extending from spiramen to orificial margin ………………………… Adeonellopsis japonica ( Ortmann, 1890)

– Suboral avicularium small, rostrum narrower than orifice; avicularium distant from orifice ………………………………………………………………… Adeonellopsis parvirostrum sp. nov.

6. Suboral avicularia small, single or paired ……… Adeonellopsis pentapora Canu & Bassler, 1929 – Suboral avicularium large, single ……………………………………………………………………7

7. Branches usually greater than 2.5 mm wide; suboral avicularium directed distally; peristome not tubular; autozooidal spiramen width less than orifice width; spiramen circular in marginal autozooids ……………………………………………… Adeonellopsis sparassis ( Ortmann, 1890)

– Branches usually less 2.0 mm wide; suboral avicularia directed distolaterally; peristome tubular; autozooidal spiramen width equal to or greater than orifice width; spiramen oval or irregular in marginal autozooids ……………………………………………………… Adeonellopsis toyoshioae sp. nov.