Choroterpes (Dilatognathus) minor ( Dang 1967 )

Kluge, Nikita J., 2014, Indonesian species of Dilatognathus Kluge 2012 (Ephemeroptera, Leptophlebiidae, Choroterpes s. l.) and species-specific sexual dimorphism in development of maxilla, Zootaxa 3786 (1) : -

Choroterpes (Dilatognathus) minor ( Dang 1967)

= Choroterpides minor Dang 1967

= Dilatognathus/g(1) sp.4: Kluge 2012

Material. CHINA, HAINAN, Miao-Li, 19.XII. 1957, coll. N. Andrianova: 4 larvae: L/S♂, L n♂, L n♀, L n- 1 ♀ (ready to molt to L n).

Additional characteristics. Larva. Differs from all other species of Dilatognathus by shape of tergalii, which are relatively long and narrow ( Fig. 28 ). Median incision of labrum shallow, with shallow median convexity and five or three shallow denticles [similar to Ch. (D.) cataractae , Ch. (D.) major and Ch. (D.) bogori ]. Structure of maxillary apex in penultimolarva the same as in ultimolarva: with long tusk bearing 3 vestiges of ventral pectinate setae, without ventro-apical flange and without dentiseta.

Imago. Unknown.

Dimension. Length of ultimolarva 6–7 mm.

Distribution. Indochina Peninsula ( Vietnam) and Hainan Island.

Figures

FIGURES 19 – 28. Choroterpes (Dilatognathus) spp. 19 – 24, Ch. (D.) bogori: 19 and 20, apex of maxilla in pen-penpenultimate larval instar (ventral view; tusk, ventro-apical flange and vestiges of pectinate ventral setae are shown, other setae not shown): 19, male; 20, female; 21 and 21, genitals of male imago, ventral view (holotype); 23, tergalius III (second existent); 24, middle part of anterior margin of labrum, ventral view. 25 – 26, genitals and enlarged penis of Choroterpides exiguus (Eaton 1884 [Thraulus]) (from Eaton 1884: Pl. 13, Fig. 20 * 2). 27, Choroterpes (Dilatognathus) major, tergalius III (second existent). 28, Choroterpes (Dilatognathus) minor, the same.