Hippomonavella sp.

Boonzaaier-Davids, Melissa K., Ma, Kevin C. K. & Mcquaid, Christopher D., 2023, Epibiotic association of encrusting cheilostome bryozoans on shells of an invasive mussel from rocky shores of South Africa, with the description of a new aviculiferous species of Chaperia, Zootaxa 5258 (2), pp. 197-210 : 205-206

Hippomonavella sp.

( Fig. 3D–F , Table 5 )

Material examined. SAMC-A094529 , SAMC-A094632 , Jeffreys Bay (34°01′35.5″S, 24°55′52.2″E), 3 August 2020. All material was collected by K.C.K. Ma and is kept dry .

Additional comparative material examined: SAMC-A029050 , holotype of Hippomonavella lingulata Boonzaaier-Davids, Florence & Gibbons, 2020 (preserved in ethanol), station AFR273 A31624 (33°48′24″S, 25°56′48″E), Algoa Bay , Southeast Coast, South Africa, South Coast Demersal Survey, trawl, depth 45 m, 21 April 2011 .

Remarks. This species is confidently placed in Hippomonavella based on the presence of a typical bitectiporid orifice, median suboral avicularium directed proximally, marginal areolae, and the absence of a lyrula. It differs from known Hippomonavella species recorded from South Africa, namely H. formosa (MacGillivray, 1887) and H. lingulata , in the shape, size, and position of the median suboral avicularium, as well as the orifice shape, suggesting a new record of this genus from South Africa. Comparing measurements of the autozooids showed that Hippomonavella sp. (N T = 20; mean length 0.57 mm by mean width 0.35 mm, Table 5 ) is smaller than H. lingulata (N T = 14–17; mean length 0.78 mm by mean width 0.50 mm, Boonzaaier-Davids et al. 2020, p. 122).

T

In this study, five colonies of Hippomonavella sp. were found on two individuals of M. galloprovincialis ; it has previously been found forming encrustations on other shells and rocks in c. 600 km farther west False Bay ( Boonzaaier 2017).

A separate manuscript revising the superfamily Smittinoidea in South Africa is in preparation and will include the description of this new species, the type material of which will be selected from samples from False Bay sites that yielded better preserved specimens .

Figures

FIGURE 3. A–C. Celleporella hyalina SAMC-A094510.A. General view of the colony. B. Single ovicelled zooid. C. Group of ovicelled zooids and a male dwarf zooid. D–F. Hippomonavella sp. SAMC-A094529. D. Group of zooids. E. Group of zooids, some with developing ovicells. F. Close-up of the orifice, showing condyles and suboral avicularium. Scale bars: A = 1 mm; B, C = 0.2 mm; D = 1 mm; E = 0.4 mm; F = 0.1 mm.