Hydraena fosterorum, Trizzino, Marco, Jäch, Manfred A., Audisio, Paolo & Ribera, Ignacio, 2011

Trizzino, Marco, Jäch, Manfred A., Audisio, Paolo & Ribera, Ignacio, 2011, Molecular and morphological analyses confirm two new species of the Hydraena emarginata – saga clade (Coleoptera, Hydraenidae) from Spain and France, Zootaxa 2760, pp. 29-38 : 32

Hydraena fosterorum n. sp. Trizzino, Jäch & Ribera

(Figs 5–8)

Type locality. Spain, Burgos province, Fresneda de la Sierra, Tirón river, 1085 m a.s.l., N42º16’46.2” W3º7’56.0”.

Type material. Holotype male ( MNCN): "ES Burgos 22.10.2004 / Fresneda de la Sierra: r. Tirón / N42º16’46.2” W3º7’56.0” / 1085m I.Ribera leg.". Paratypes (129 specimens: BMNH, CSR, IBE, MNCN, NMW): 8 males and 4 females same locality and data as holotype; one male used for DNA extraction and sequencing, voucher number MNCN-AI282. 4 males and 8 females Spain, La Rioja province, Logroño, Posadas, Río Oja, 1159 m, N42º12’36.0” W3º4’27.8” 23.10.0 4 Ribera leg.; one male used for DNA extraction and sequencing, voucher number MNCN –AI481. 8 males and 5 females Spain, La Rioja province, Logroño, Posadas, Río Oja, artificial pool, 1200 m, N42º12’36.0” W3º4’27.8” 23.10.0 4 Ribera leg. 33 males and 52 females Spain, Burgos, Fresneda de la Sierra Tirón, Río Tirón, N42º16’46.2” W3º7’56.0”, 1100 m, 15.8.1994, Fresneda leg. 1 male Spain, Soria, Vinuesa, 2km Pto. Sta. Inés, 16.7.1991, Fery leg. 1 female Spain, Soria, Vinuesa, Laguna Negra, 13.6.1990, Fresneda leg. 3 males and 1 female Spain, Zaragoza, Moncayo, Fuente del Pedregal, 9.4.1993, Fresneda leg. 1 female Spain, Zaragoza, Moncayo, entre Veruela y Na. Sierra Del Moncayo, 9.4.1993, Fresneda leg.

Description. 2.15–2.30 mm long. Male habitus as in Hydraena diazi .

Aedeagus (Fig. 5): Length of main piece 555 μm (holotype), with four setae, three on left side and one very reduced (typical of members of the H. emarginata – saga complex) on right side. Apex distinctly more rounded than in related species (including H. diazi ); pre–apical dorsal incision absent. Apical half of the main piece in right side view markedly more curved and wider (about 1.3 times) than in H. saga and H. alpicola (Figs 5, 9, 10). Pre–basal tooth not very prominent, phallobase symmetrical in ventral view. Distal lobe as in H. saga and H. alpicola , seemingly without variability in size.

Gonocoxite and female tergite X as in Figs 6 –7.

Secondary sexual characters: male elytral apices conjointly rounded, with a small sutural notch. Distal third of female elytral apices very widely explanate (Fig. 8), conjointly rounded, with a very large sutural notch (resembling H. samnitica and H. pangaei ). Female ventrites V and VI with fringe of long setae. Male ventrite VI enlarged. Male mesotibia with a row of ca. eight minute denticles along mesial face of posterior half. Male metatibia with fringe of long setae along mesial face of posterior half. Male tergite X as in H. saga and related species.

Differential diagnosis. H. fosterorum is cleary related to H. diazi , H. saga , H. larissae , H. emarginata , and H. alpicola (see also fig. 12). The aedeagus of H. fosterorum (Fig. 5) could be easily distinguished from the other related species by the markedly curved and markedly wide distal half of the main piece, and from H. diazi ( Fig. 1 ) by the rounded apex of the main piece and by the absence of the small dorsal pre–distal V–shaped incision. The aedeagus of H. emarginata ( Fig. 11) can be distinguished also by its distinctly larger size (PL: 610–665 µm), and by the distinctly larger distal lobe. Moreover, H. fosterorum could be easily distinguished from any other species of the H. emarginata – saga complex by the peculiar female elytral shape (Fig. 8).

Distribution. H. fosterorum is known only from the north of the Iberian System mountains, in Sierra de la Demanda and del Moncayo ( Fig. 13 ). Specimens from that region previously attributed to H. saga (e.g. Valladares et al. 2000) almost certainly belong to the new species.

Etymology. We are pleased to dedicate this species to our friends Sue and Garth Foster, who accompanied IR when collecting some of the paratypes.

Figures

FIGURE 1. Aedeagus in right side view of Hydraena diazi (Spain, Guipuzkoa prov., Oiartzun). Scale bar = 0.2 mm. FIGURE 2. Female gonocoxite of Hydraena diazi (Spain, Barcelona prov., Santa Fe del Montseny). Scale bar = 0.2 mm. FIGURE 3. Female tergite X of Hydraena diazi (Spain, Barcelona prov., Santa Fe del Montseny). Scale bar = 0.2 mm. FIGURE 4. Female elytral apices (not scaled) of Hydraena diazi (Spain, Barcelona prov., Santa Fe del Montseny). FIGURE 5. Aedeagus in right side view of Hydraena fosterorum (Spain, Burgos prov., Fresneda de la Sierra). Scale bar = 0.2 mm.

FIGURE 13. Geographic distribution of members of the H. emarginata – saga clade. Sequenced populations of the two new species are marked with a black dot within the symbol.