Hincksina flustroides ( Hincks, 1877 )

Reverter-Gil, Oscar & Souto, Javier, 2023, New and non-indigenous species of Bryozoa from Iberian waters, European Journal of Taxonomy 885, pp. 33-64 : 41-43

Hincksina flustroides ( Hincks, 1877)

Figs 5 , 12B ; Table 3

Membranipora flustroides Hincks, 1877: 213 .

Membranipora flustroides – Hincks 1880: 151, pl. 19 fig. 2.

Hincksina flustroides – Fernández Pulpeiro 1983: 472. — Reverter-Gil & Fernández-Pulpeiro 2001: 59. — Reverter-Gil et al. 2019a: 10. — Berning et al. 2021: 335 , fig. 1.

? Hincksina flustroides – Zabala & Gili 1985: 138. — Calvín Calvo 1986: 48. — Haya & Anadón 1989: 111, fig. 2. — Álvarez 1992: 276. — Madurell et al. 2013: 127.

Non Hincksina flustroides – Zabala 1986: 255, fig. 62, pl. 1 fig. a. — López de la Cuadra & García Gómez 1988: 23; 1994: 110 (part or whole). — López de la Cuadra 1991: 94 (part or whole), pl. 7 figs c–d. — Templado et al. 2002: 202; 2006: 207.

Material examined

ATLANTIC IBERIAN PENINSULA – Galicia • several small colonies on maerl; Ría of Vigo ; 42.23889° N, 08.79639° W; depth 16 m; 16 Sep. 1986; E. Fernández-Pulpeiro leg.; MHNUSC-Bry 54 • 1 ovicelled colony on stone with more species; Ría of Ferrol ; 43.45444° N, 08.31222° W; depth 15 m; 13 Jul. 1991; O. Reverter-Gil leg.; MHNUSC-Bry 163 • 1 large colony, ovicelled, on shell, together with more species; Cíes Islands ; 42.21139° N, 08.90556° W; depth 12 m; 23 Aug. 2012; J. Souto leg.; MHNUSC-Bry 617 ( Fig. 5 ) • 1 ovicelled colony on shell, together with more species; Cíes Islands ; 42.21139° N, 08.90556° W; depth 12 m; 23 Aug. 2012; J. Souto leg.; MHNUSC-Bry 618 • several ovicelled colonies on shell, together with more species; Ría of Ferrol ; 43.46480° N, 08.27001° W; depth 18 m; 24 May 2021; J. Souto leg.; MHNUSC-Bry 706 , 707 . – Portugal • several ovicelled colonies on shells and stones, together with more species; Arrabida ; 38.49642° N, 08.92968° W; stn 20; depth 20–35 m; 23 Sep. 2014; J. Souto leg.; MHNUSC-Bry 710 to 716 • 1 colony on barnacle plate, together with more species; Estelas Islands ; 39.42438° N, 09.52500° W; stn 48; depth 18.8–21 m; 26 Sep. 2012; J. Souto leg.; MHNUSC-Bry 717 • several ovicelled colonies on stone, together with more species; Berlengas Islands ; 39.41957° N 09.50513° W; stn 30; depth 22–25 m; 22 Sep. 2012; J. Souto leg.; MHNUSC-Bry 718 • several ovicelled colonies on shells and stone, together with more species; Berlengas Islands ; 39.41005° N 09.49483° W; stn 59; depth 27–27.4 m; 28 Sep. 2012; J. Souto leg.; MHNUSC-Bry 719–721 • 2 colonies on stone, together with more species; Farilhoes Islands ; 39.47835° N, 09.54077° W; stn 46; depth 17–18.6 m; 26 Sep. 2012; J. Souto leg.; MHNUSC-Bry 722 • several colonies on shell, together with more species; Berlengas Islands ; 39.41148° N, 09.50667° W; stn 37; depth 19.5–21 m; 24 Sep. 2012; J. Souto leg.; MHNUSC-Bry 723 , 724 • 1 colony on stone, together with more species; Farilhoes Islands ; 39.47850° N, 09.54170° W; stn 18; depth unknown; 20 Sep. 2012; J. Souto leg.; MHNUSC-Bry 726 • 2 ovicelled colonies on stone, together with more species; Farilhoes Islands ; 39.47462° N 09.54358° W; stn 39; depth 15.3–24 m; 25 Sep. 2012; J. Souto leg.; MHNUSC-Bry 727 • several ovicelled colonies on stone, together with more species; Farilhoes Islands ; 39.47728° N, 09.54365° W; stn 53; depth 29.5–33 m; 27 Sep. 2012; J. Souto leg.; MHNUSC-Bry 729 .

Remarks

The revision of previous citations of H. flustroides in Iberian waters in the literature is of little help because most of them lack detailed descriptions and figures. We have therefore directly revised the available material. The material from Galicia, reported by Fernández Pulpeiro (1983), Reverter-Gil & Fernández-Pulpeiro (2001) and Reverter-Gil et al. (2019a), as well as newly collected material from the area (see Material examined), do correspond to H. flustroides . Also, newly collected material from several Portuguese localities (see Material examined) belongs to this species. Part of the material from Galicia and Portugal is similar to the type material of the species figured by Berning et al. (2021: fig. 1) and part to the material figured by De Blauwe (2009: figs 175–176). Since all of this material is actually H. flustroides , it is very likely that the material from nearby Asturias, reported by Haya & Anadón (1989) ( Fig. 12B ), is the same species, despite the doubts expressed by Berning et al. (2021).

The biometries of our own material ( Table 3) are significantly similar to those included by Berning et al. (2021) in the redescription of the species, except for the size of the avicularia. Indeed, the measurements of these authors are much lower than ours, but this seems to reflect a calculation error. In fact, measuring on their photographs ( Berning et al. 2021: fig. 1), the sizes of the avicularia are approximately 0.21 × 0.16 mm, very close to our own data. Size is also similar to the material figured in the British Fauna ( Hayward & Ryland 1998).

The rest of the Iberian material labelled as H. flustroides that we have revised, from the Strait of Gibraltar to the Spanish Levant, does not really correspond to the species. This includes the records of H. flustroides published by Zabala (1986), López de la Cuadra & García Gómez (1988, 1994), López de la Cuadra (1991) and Templado et al. (2002, 2006), which correspond to other species (see below). Other records from the Mediterranean, such as those of Zabala & Gili (1985), Calvín Calvo (1986), Álvarez (1992) or Madurell et al. (2013), very probably do not correspond to this species either, but to H. synchysia (see below). Other species, however, could be involved, calling for new sampling in these areas.

According to Berning et al. (2021), H. flustroides was known with certainty only from western Great Britain, the Channel, and the southern North Sea, whereas its southern limit of distribution remained unclear. Here we considerably extend the southern limit of the species, which reaches at least the Portuguese coast around Lisbon. There does not seem to be at present any realiable record or material of H. flustroides from the south of Portugal, the area of the Strait of Gibraltar or from the Spanish Mediterranean ( Fig. 12B ).

Figures

Fig. 5. Hincksina flustroides (Hincks, 1877) (MHNUSC-Bry 617), Cíes Islands (Galicia, NW Spain). A. Autozooids and avicularia. B. Ovicelled zooids.

Fig. 12. Iberian distribution of the species treated in the present paper (see legends in the figures). A. Arbopercula angulata (Levinsen, 1909) and Caberea cantabra sp. nov. B. Species of Hincksina Norman, 1903.